fix renderable multidoku max coords

Reviewed-on: #37

README.md

@@ -0,0 +1,21 @@
+# Sudoku 🧩
+
+## Features 🌟
+
+- Graphical User Interface (GUI)
+- Sudoku saves
+- Multiplayer
+
+## Develop ☝🤓
+
+### Run 🏃
+
+```sh
+./gradlew run
+```
+
+### Run tests 🗣️🔥
+
+```sh
+./gradlew test
+```

app/build.gradle

@@ -11,6 +11,8 @@ plugins {
     id 'application'
 }
 
+project.ext.os = System.properties['os.name'].toLowerCase().split(" ")[0]
+
 repositories {
     // Use Maven Central for resolving dependencies.
     mavenCentral()
@@ -20,17 +22,13 @@ dependencies {
     // Use JUnit Jupiter for testing.
     testImplementation 'org.junit.jupiter:junit-jupiter:5.9.1'
 
-    // This dependency is used by the application.
-    implementation 'com.google.guava:guava:31.1-jre'
-
-    // uml
-    implementation 'com.github.javaparser:javaparser-symbol-solver-core:3.26.2'
-
     implementation 'org.json:json:20250107'
 
-    implementation 'com.fasterxml.jackson.core:jackson-databind:2.18.2'
-
     implementation "io.github.spair:imgui-java-app:1.88.0"
+
+    implementation "org.lwjgl:lwjgl-stb:3.3.4"
+
+    runtimeOnly "org.lwjgl:lwjgl-stb::natives-$os"
 }
 
 application {
@@ -38,9 +36,16 @@ application {
     mainClass = 'gui.Main'
 }
 
-tasks.named('test') {
+// Add libraries into the final jar
-    // Use JUnit Platform for unit tests.
+jar {
-    useJUnitPlatform()
+    archiveBaseName = rootProject.getName()
+    duplicatesStrategy = DuplicatesStrategy.EXCLUDE
+    manifest {
+        attributes "Main-Class": application.mainClass
+    }
+    from {
+        configurations.compileClasspath.collect { it.isDirectory() ? it : zipTree(it) }
+    } 
 }
 
 run {

app/src/main/java/common/ConsumerSignal.java

@@ -0,0 +1,27 @@
+package common;
+
+import java.util.HashSet;
+import java.util.Set;
+import java.util.function.Consumer;
+
+public class ConsumerSignal<T> {
+	private final Set<Consumer<T>> listeners;
+
+	public ConsumerSignal() {
+		this.listeners = new HashSet<>();
+	}
+
+	public void connect(Consumer<T> listener) {
+		this.listeners.add(listener);
+	}
+
+	public void clear() {
+		this.listeners.clear();
+	}
+
+	public void emit(T arg) {
+		for (Consumer<T> listener : this.listeners) {
+			listener.accept(arg);
+		}
+	}
+}

app/src/main/java/game/Game.java

@@ -1,6 +1,10 @@
 package game;
 
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
+import java.util.List;
 import java.util.Map;
 
 import sudoku.structure.MultiDoku;
@@ -8,15 +12,19 @@ import sudoku.structure.MultiDoku;
 public class Game {
 
 	public static enum GameState {
-		GameNotStarted, GameGoing, GameEnd
+		GameNotStarted, GameGoing
 	}
 
 	private final Map<Integer, Player> players;
+	private final List<Player> leaderboard;
 	private GameState gameState;
 	private MultiDoku doku;
+	private Instant startTime = null;
+	private long gameDuration;
 
 	public Game() {
 		this.players = new HashMap<>();
+		this.leaderboard = new ArrayList<>();
 		this.gameState = GameState.GameNotStarted;
 	}
 
@@ -26,19 +34,33 @@ public class Game {
 
 	public void addPlayer(Player player) {
 		players.put(player.getId(), player);
+		leaderboard.add(player);
+	}
+
+	public void setPlayerRemainingCells(Player player, int newScore) {
+		player.setRemainingCells(newScore);
+		Collections.sort(this.leaderboard,
+				(player1, player2) -> Integer.compare(player1.getRemainingCells(), player2.getRemainingCells()));
 	}
 
 	public void removePlayer(int id) {
-		players.remove(id);
+		this.leaderboard.remove(getPlayerById(id));
+		this.players.remove(id);
 	}
 
 	public Map<Integer, Player> getPlayers() {
 		return players;
 	}
 
-	public void startGame(MultiDoku doku) {
+	public void startGame(MultiDoku doku, Instant startTime, long gameDuration) {
 		this.doku = doku;
 		this.gameState = GameState.GameGoing;
+		this.startTime = startTime;
+		this.gameDuration = gameDuration;
+	}
+
+	public void stopGame() {
+		this.gameState = GameState.GameNotStarted;
 	}
 
 	public GameState getGameState() {
@@ -49,4 +71,16 @@ public class Game {
 		return doku;
 	}
 
+	public List<Player> getLeaderboard() {
+		return leaderboard;
+	}
+
+	public Instant getStartTime() {
+		return startTime;
+	}
+
+	public long getGameDuration() {
+		return gameDuration;
+	}
+
 }

app/src/main/java/game/Player.java

@@ -8,10 +8,20 @@ public class Player implements Serializable {
 
 	private final String pseudo;
 	private final int id;
+	private int score;
 
 	public Player(int id, String pseudo) {
 		this.pseudo = pseudo;
 		this.id = id;
+		this.score = 0;
+	}
+
+	public int getRemainingCells() {
+		return score;
+	}
+
+	void setRemainingCells(int score) {
+		this.score = score;
 	}
 
 	public String getPseudo() {

app/src/main/java/gui/Fonts.java

@@ -1,22 +0,0 @@
-package gui;
-
-import imgui.ImFont;
-import imgui.ImGui;
-
-public class Fonts {
-
-	public static ImFont ARIAL;
-	public static ImFont ARIAL_BOLD;
-	public static ImFont CHERI;
-	public static ImFont COMIC;
-	public static ImFont INFECTED;
-
-	public static void createFonts() {
-		COMIC = ImGui.getIO().getFonts().addFontFromFileTTF("comic.ttf", 50.0f);
-        ARIAL_BOLD = ImGui.getIO().getFonts().addFontFromFileTTF("arial_bold.ttf", 50.0f);
-        ARIAL = ImGui.getIO().getFonts().addFontFromFileTTF("arial.ttf", 50.0f);
-        CHERI = ImGui.getIO().getFonts().addFontFromFileTTF("cheri.ttf", 50.0f);
-		INFECTED = ImGui.getIO().getFonts().addFontFromFileTTF("INFECTED.ttf", 50.0f);
-	}
-
-}

app/src/main/java/gui/Main.java

@@ -1,10 +1,16 @@
 package gui;
 
+import gui.constants.Fonts;
+import gui.constants.Images;
+import gui.constants.Symbols;
 import gui.menu.MainMenu;
 import gui.menu.StateMachine;
-import imgui.ImGui;
 import imgui.app.Application;
 import imgui.app.Configuration;
+import sudoku.io.SudokuPrinter;
+import sudoku.structure.Difficulty;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.SudokuFactory;
 
 public class Main extends Application {
 
@@ -26,6 +32,12 @@ public class Main extends Application {
         Fonts.createFonts();
         stateMachine.pushState(new MainMenu(stateMachine));
     }
+    
+    @Override
+    protected void preRun() {
+        super.preRun();
+        Images.loadImages();
+    }
 
     @Override
     public void process() {
@@ -34,6 +46,13 @@ public class Main extends Application {
     }
 
     public static void main(String[] args) {
-        launch(new Main());
+        MultiDoku doku = SudokuFactory.createBasicPlusShapedMultidoku(3, 3, SudokuFactory.DEFAULT_CONSTRAINTS);
+        try {
+            SudokuFactory.fillDoku(doku, Difficulty.Easy);
+        } catch (Exception e) {
+            throw new RuntimeException();
+        }
+        SudokuPrinter.printMultiDoku(doku, 3, 3, Symbols.Numbers);
+        //launch(new Main());
     }
 }

app/src/main/java/gui/RenderableMultidoku.java

@@ -47,22 +47,6 @@ public class RenderableMultidoku {
 		return cells.get(index);
 	}
 
-	public boolean setCellValue(Cell cell, int value) {
-		for (Sudoku s : doku.getSubGrids()) {
-			int cellIndex = s.getCells().indexOf(cell);
-			// la cellule existe
-			if (cellIndex != -1) {
-				int cellX = cellIndex % s.getSize();
-				int cellY = cellIndex / s.getSize();
-				if (!s.canBePlaced(cellX, cellY, value)) {
-					return false;
-				}
-			}
-		}
-		cell.setSymbolIndex(value);
-		return true;
-	}
-
 	private static record PositionConstraint(Sudoku sudoku1, Sudoku sudoku2, Coordinate offset) {
 	}
 
@@ -106,29 +90,23 @@ public class RenderableMultidoku {
 	}
 
 	private static Coordinate getMaxSudokuCoordinate(Map<Sudoku, Coordinate> sudokusOffset) {
-		Coordinate maxCoordinate = null;
+		int maxX = 0;
-		Sudoku maxSudoku = null;
+		int maxY = 0;
-		float maxDistanceSquared = 0;
+		Sudoku lastSudoku = null;
 		for (var entry : sudokusOffset.entrySet()) {
 			Coordinate coordinate = entry.getValue();
-			float distanceSquared = coordinate.getX() * coordinate.getX() + coordinate.getY() * coordinate.getY();
+			if (coordinate.getX() > maxX)
-			if (maxCoordinate == null) {
+			maxX = coordinate.getX();
-				maxCoordinate = coordinate;
+			if (coordinate.getY() > maxY)
-				maxDistanceSquared = distanceSquared;
+			maxY = coordinate.getY();
-				maxSudoku = entry.getKey();
+			lastSudoku = entry.getKey();
-			}
-
-			if (distanceSquared > maxDistanceSquared) {
-				maxDistanceSquared = distanceSquared;
-				maxSudoku = entry.getKey();
-				maxCoordinate = coordinate;
-			}
 		}
 
-		int blockWidth = maxSudoku.getBlockWidth();
+		Coordinate maxCoordinate = new Coordinate(maxX, maxY);
-		int blockHeight = maxSudoku.getSize() / blockWidth;
+		// tous les sudokus sont censés faire la même taille
+		int sudokuSize = lastSudoku.getSize();
 
-		return new Coordinate(maxCoordinate.getX() + maxSudoku.getSize(), maxCoordinate.getY() + maxSudoku.getSize());
+		return new Coordinate(maxCoordinate.getX() + sudokuSize, maxCoordinate.getY() + sudokuSize);
 	}
 
 	public static RenderableMultidoku fromMultidoku(MultiDoku doku) {

app/src/main/java/gui/SudokuRenderer.java

@@ -1,107 +0,0 @@
-package gui;
-
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-
-import gui.ColorGenerator.Color;
-import imgui.ImGui;
-import imgui.ImVec2;
-import imgui.ImVec4;
-import imgui.flag.ImGuiCol;
-import imgui.flag.ImGuiStyleVar;
-import sudoku.structure.Block;
-import sudoku.structure.Cell;
-import sudoku.structure.MultiDoku;
-
-public class SudokuRenderer {
-
-	private final RenderableMultidoku doku;
-	private Cell currentCell = null;
-	private final Map<Block, Color> colorPalette;
-
-	public SudokuRenderer(MultiDoku doku) {
-		this.doku = RenderableMultidoku.fromMultidoku(doku);
-		this.colorPalette = initColors();
-	}
-
-	private Map<Block, Color> initColors() {
-		List<Color> colors = ColorGenerator.greatPalette(doku.getBlocks().size());
-		Map<Block, Color> colorPalette = new HashMap<>();
-		int index = 0;
-		for (Block block : doku.getBlocks()) {
-			colorPalette.put(block, colors.get(index));
-			index++;
-		}
-		return colorPalette;
-	}
-
-	private void renderPopup() {
-		final ImVec2 buttonSize = new ImVec2(50, 50);
-		if (ImGui.beginPopup("editPopup")) {
-			Block block = currentCell.getBlock();
-			int symbolCount = block.getCells().size();
-			for (int i = 0; i < symbolCount; i++) {
-				if ((i + 1) % (int) (Math.sqrt(symbolCount)) != 1)
-					ImGui.sameLine();
-				if (currentCell.getSymbolIndex() == i) {
-					if (ImGui.button("X", buttonSize)) {
-						currentCell.setSymbolIndex(Cell.NOSYMBOL);
-						ImGui.closeCurrentPopup();
-					}
-				}else {
-					if (ImGui.button(Integer.toString(i + 1), buttonSize)) {
-						this.doku.setCellValue(currentCell, i);
-						ImGui.closeCurrentPopup();
-					}
-				}
-			}
-			ImGui.endPopup();
-		}
-	}
-
-	public void render() {
-		ImGui.pushStyleVar(ImGuiStyleVar.FrameBorderSize, 2.0f);
-		ImGui.pushStyleVar(ImGuiStyleVar.ItemSpacing, new ImVec2(0.0f, 0.0f));
-		ImGui.pushStyleColor(ImGuiCol.Border, new ImVec4(0.0f, 0.0f, 0.0f, 1.0f));
-		for (int y = 0; y < doku.getHeight(); y++) {
-			for (int x = 0; x < doku.getWidth(); x++) {
-				if (x > 0)
-					ImGui.sameLine();
-				int index = y * doku.getWidth() + x;
-				Cell cell = doku.getCell(x, y);
-				if (cell == null) {
-					ImGui.pushStyleColor(ImGuiCol.Button, new ImVec4(0.0f, 0.0f, 0.0f, 1.0f));
-					ImGui.button("##" + index, new ImVec2(50, 50));
-				} else {
-					int symbol = cell.getSymbolIndex();
-					Color blockColor = colorPalette.get(cell.getBlock());
-					if (!cell.isMutable()) {
-						// ImGui.pushFont(Fonts.ARIAL_BOLD);
-						blockColor = new Color(blockColor.r - 0.20f, blockColor.g - 0.20f, blockColor.b - 0.20f);
-						// ImGui.pushStyleColor(ImGuiCol.Text, new ImVec4(0.1f, 0.1f, 0.1f, 1.0f));
-					} else {
-						// ImGui.pushFont(Fonts.CHERI);
-					}
-					ImGui.pushStyleColor(ImGuiCol.Button, new ImVec4(blockColor.r, blockColor.g, blockColor.b, 1.0f));
-					String cellText = "";
-					if (symbol != -1)
-						cellText += Integer.toString(symbol + 1);
-					if (ImGui.button(cellText + "##" + index, new ImVec2(50, 50))) {
-						ImGui.openPopup("editPopup");
-						currentCell = cell;
-					}
-					if (!cell.isMutable()) {
-						// ImGui.popStyleColor();
-					}
-					// ImGui.popFont();
-				}
-				ImGui.popStyleColor();
-			}
-		}
-		ImGui.popStyleColor();
-		ImGui.popStyleVar(2);
-		renderPopup();
-	}
-
-}

app/src/main/java/gui/constants/Fonts.java

@@ -0,0 +1,34 @@
+package gui.constants;
+
+import imgui.ImFont;
+import imgui.ImFontConfig;
+import imgui.ImFontGlyphRangesBuilder;
+import imgui.ImGui;
+
+public class Fonts {
+
+	public static ImFont ARIAL;
+	public static ImFont ARIAL_BOLD;
+	public static ImFont CHERI;
+	public static ImFont COMIC;
+	public static ImFont INFECTED;
+	public static ImFont EMOJIS;
+
+	private static final String baseDir = "";
+
+	public static void createFonts() {
+		ImFontGlyphRangesBuilder builder = new ImFontGlyphRangesBuilder();
+		builder.addRanges(ImGui.getIO().getFonts().getGlyphRangesDefault());
+		builder.addRanges(ImGui.getIO().getFonts().getGlyphRangesCyrillic());
+		// builder.addRanges(ImGui.getIO().getFonts().getGlyphRangesChineseFull());
+		ImFontConfig cfg = new ImFontConfig();
+		cfg.setGlyphRanges(builder.buildRanges());
+
+		COMIC = ImGui.getIO().getFonts().addFontFromFileTTF(baseDir + "comic.ttf", 50.0f);
+		ARIAL_BOLD = ImGui.getIO().getFonts().addFontFromFileTTF(baseDir + "arial_bold.ttf", 50.0f);
+		ARIAL = ImGui.getIO().getFonts().addFontFromFileTTF(baseDir + "arial.ttf", 50.0f, cfg);
+		CHERI = ImGui.getIO().getFonts().addFontFromFileTTF(baseDir + "cheri.ttf", 50.0f);
+		INFECTED = ImGui.getIO().getFonts().addFontFromFileTTF(baseDir + "INFECTED.ttf", 50.0f);
+	}
+
+}

app/src/main/java/gui/constants/Images.java

@@ -0,0 +1,39 @@
+package gui.constants;
+
+import java.nio.ByteBuffer;
+
+import org.lwjgl.opengl.GL11;
+import org.lwjgl.stb.STBImage;
+
+public class Images {
+
+	public static int BACKGROUND;
+
+	private static int loadTexture(String fileName) {
+		int[] width = new int[1];
+		int[] height = new int[1];
+		int[] channelCount = new int[1];
+
+		ByteBuffer pixels = STBImage.stbi_load(fileName, width, height, channelCount, 4);
+
+		int textureID = GL11.glGenTextures();
+		GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureID);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
+		GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
+		GL11.glPixelStorei(GL11.GL_UNPACK_ALIGNMENT, 1); // Not on WebGL/ES
+		GL11.glPixelStorei(GL11.GL_UNPACK_SKIP_PIXELS, 0); // Not on WebGL/ES
+		GL11.glPixelStorei(GL11.GL_UNPACK_SKIP_ROWS, 0); // Not on WebGL/ES
+		GL11.glPixelStorei(GL11.GL_UNPACK_ROW_LENGTH, 0); // Not on WebGL/ES
+		GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGBA, width[0], height[0], 0,
+				GL11.GL_RGBA,
+				GL11.GL_UNSIGNED_BYTE, pixels);
+		GL11.glBindTexture(GL11.GL_TEXTURE_2D, 0);
+
+		return textureID;
+	}
+
+	public static void loadImages() {
+		BACKGROUND = loadTexture("background.png");
+	}
+
+}

app/src/main/java/gui/constants/Options.java

@@ -0,0 +1,8 @@
+package gui.constants;
+
+public class Options {
+
+	public static Symbols Symboles = Symbols.Numbers;
+	public static float BackgroundSpeed = 1.0f;
+
+}

app/src/main/java/gui/constants/SudokuType.java

@@ -0,0 +1,67 @@
+package gui.constants;
+
+import java.util.List;
+
+import sudoku.constraint.IConstraint;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.SudokuFactory;;
+
+public enum SudokuType {
+
+	Square("Carré", 1,
+			(constraints, params) -> SudokuFactory.createBasicEmptySquareDoku(params[0], constraints)),
+	Rectangle("Rectangle", 2,
+			(constraints, params) -> SudokuFactory.createBasicEmptyRectangleDoku(params[0], params[1], constraints)),
+	RandomBloc("Blocs aléatoires", 1,
+			(constraints, params) -> SudokuFactory.createBasicEmptyRandomBlockDoku(params[0], constraints)),
+	MultiDokuXSquare("Multidoku carré (X)", 1,
+			(constraints, params) -> SudokuFactory.createBasicXShapedMultidoku(params[0], constraints)),
+	MultidokuXRectangle("Multidoku rectangle (X)", 2,
+			(constraints, params) -> SudokuFactory.createBasicXShapedMultidoku(params[0], params[1], constraints)),
+	MultiDokuPSquare("Multidoku carré (+)", 1,
+			(constraints, params) -> SudokuFactory.createBasicPlusShapedMultidoku(params[0], constraints)),
+	MultiDokuPRectangle("Multidoku rectangle (+)", 2,
+			(constraints, params) -> SudokuFactory.createBasicPlusShapedMultidoku(params[0], params[1], constraints));
+
+	String displayName;
+	SudokuMaker maker;
+	int paramCount;
+
+	private SudokuType(String displayName, int paramCount, SudokuMaker maker) {
+		this.displayName = displayName;
+		this.maker = maker;
+		this.paramCount = paramCount;
+	}
+
+	public String getDisplayName() {
+		return this.displayName;
+	}
+
+	public MultiDoku createDoku(List<IConstraint> constraints, int... params) {
+		return maker.makeSudoku(constraints, params);
+	}
+
+	public int getMakerParamCount() {
+		return this.paramCount;
+	}
+
+	@FunctionalInterface
+	private static interface SudokuMaker {
+		MultiDoku makeSudoku(List<IConstraint> constraints, int... params);
+	}
+
+	private static final String[] dokuNames;
+
+	static {
+		SudokuType[] types = SudokuType.values();
+		dokuNames = new String[types.length];
+		for (int i = 0; i < types.length; i++) {
+			dokuNames[i] = types[i].getDisplayName();
+		}
+	}
+
+	public static String[] getTypeNames() {
+		return dokuNames;
+	}
+
+}

app/src/main/java/gui/constants/Symbols.java

@@ -0,0 +1,83 @@
+package gui.constants;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public enum Symbols {
+
+	Numbers("Nombres", getNumbers()),
+	Letters("Lettres", getLetters()),
+	Russian("Cyrilique", getRussian()),
+	Emojis("Emojis (Console uniquement)", getEmojis());
+
+	String displayName;
+	List<String> symbols;
+
+	private Symbols(String displayName, List<String> symbols) {
+		this.symbols = symbols;
+		this.displayName = displayName;
+	}
+
+	public String getDisplayName() {
+		return displayName;
+	}
+
+	public List<String> getSymbols() {
+		return symbols;
+	}
+
+	private static List<String> getNumbers() {
+		List<String> sym = new ArrayList<>();
+		for (int i = 1; i <= 100; i++) {
+			sym.add(Integer.toString(i));
+		}
+		return sym;
+	}
+
+	private static List<String> getLetters() {
+		List<String> sym = new ArrayList<>();
+		for (int i = 0; i < 100; i++) {
+			int currentOffset = i;
+			String letter = "";
+			while (currentOffset >= 26) {
+				letter += Character.toString((char) ('A' + currentOffset % 26));
+				currentOffset /= 26;
+				currentOffset--;
+			}
+			letter += Character.toString((char) ('A' + currentOffset % 26));
+			sym.add(new StringBuilder(letter).reverse().toString());
+		}
+		return sym;
+	}
+
+	private static List<String> getRussian() {
+		List<String> sym = new ArrayList<>();
+		for (int i = 0; i < 100; i++) {
+			sym.add(new String(Character.toChars(0X0400 + i)));
+		}
+		return sym;
+	}
+
+	private static List<String> getEmojis() {
+		List<String> sym = new ArrayList<>();
+		for (int i = 0; i < 100; i++) {
+			sym.add(new String(Character.toChars(0X1F600 + i)));
+		}
+		return sym;
+	}
+
+	private static final String[] symbolNames;
+
+	static {
+		Symbols[] symbols = Symbols.values();
+		symbolNames = new String[symbols.length];
+		for (int i = 0; i < symbols.length; i++) {
+			symbolNames[i] = symbols[i].getDisplayName();
+		}
+	}
+
+	public static String[] getSymbolsNames() {
+		return symbolNames;
+	}
+
+}

app/src/main/java/gui/menu/EndGameView.java

@@ -0,0 +1,49 @@
+package gui.menu;
+
+import game.Player;
+import gui.ColorGenerator;
+import gui.widget.SudokuRenderer;
+import imgui.ImGui;
+import imgui.ImVec4;
+import sudoku.structure.MultiDoku;
+
+public class EndGameView extends BaseView {
+
+	private final Player winner;
+	private float time = 0;
+
+	private static final ImVec4 YELLOW = new ImVec4(1, 1, 0, 1);
+
+	private final SudokuRenderer sudokuRenderer;
+
+	public EndGameView(StateMachine stateMachine, MultiDoku resolved, Player winner) {
+		super(stateMachine);
+		this.winner = winner;
+		this.sudokuRenderer = new SudokuRenderer(resolved);
+	}
+
+	private ImVec4 getPseudoColor() {
+		time += ImGui.getIO().getDeltaTime();
+		float factor = (float) Math.cos(time);
+		var color = ColorGenerator.hslToRgb(factor * factor, 0.9f, 0.4f);
+		return new ImVec4(color.r, color.g, color.b, 1.0f);
+	}
+
+	private void renderWinText() {
+		String winText = " a gagné !";
+		String text = winner.getPseudo() + winText;
+		float textWidth = ImGui.calcTextSizeX(text);
+		ImGui.setCursorPosX(ImGui.getIO().getDisplaySizeX() / 2.0f - textWidth / 2.0f);
+		ImGui.textColored(getPseudoColor(), winner.getPseudo());
+		ImGui.sameLine();
+		ImGui.textColored(YELLOW, winText);
+	}
+
+	@Override
+	public void render() {
+		renderWinText();
+		this.sudokuRenderer.render();
+		renderReturnButton();
+	}
+
+}

app/src/main/java/gui/menu/MultiMenu.java

@@ -20,7 +20,8 @@ public class MultiMenu extends BaseView {
 	private void renderCreate() {
 		ImVec2 displaySize = ImGui.getIO().getDisplaySize();
 		ImGui.beginChild("##CreateGame", new ImVec2(displaySize.x / 2.0f, displaySize.y * 8.0f / 9.0f));
-		ImGui.inputInt("Port", port);
+		if (ImGui.inputInt("Port", port))
+			port.set(Math.clamp(port.get(), 1, 65535));
 		if (ImGui.button("Créer")) {
 			try {
 				this.stateMachine.pushState(new ConnexionStatusView(stateMachine, (short) port.get()));
@@ -35,12 +36,12 @@ public class MultiMenu extends BaseView {
 		ImVec2 displaySize = ImGui.getIO().getDisplaySize();
 		ImGui.beginChild("##JoinGame", new ImVec2(displaySize.x / 2.0f, displaySize.y * 8.0f / 9.0f));
 		ImGui.inputText("Adresse", address);
-		ImGui.inputInt("Port", port);
+		if (ImGui.inputInt("Port", port))
+			port.set(Math.clamp(port.get(), 1, 65535));
 		if (ImGui.button("Rejoindre")) {
 			try {
 				this.stateMachine.pushState(new ConnexionStatusView(stateMachine, address.get(), (short) port.get()));
 			} catch (IOException e) {
-				// TODO Auto-generated catch block
 				e.printStackTrace();
 			}
 		}

app/src/main/java/gui/menu/MultiPlayerDokuView.java

@@ -1,22 +1,50 @@
 package gui.menu;
 
-import gui.SudokuRenderer;
+import game.Player;
+import gui.widget.LeaderboardRenderer;
+import gui.widget.MultiPlayerCompleteProgress;
+import gui.widget.SudokuRenderer;
+import gui.widget.TimerRenderer;
 import imgui.ImGui;
 import network.client.Client;
 import network.server.Server;
+import sudoku.solver.BacktrackingSolver;
+import sudoku.solver.Solver;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
 
-public class MultiPlayerDokuView extends BaseView{
+public class MultiPlayerDokuView extends BaseView {
 
 	private final Client client;
 	private final Server server;
 	private final SudokuRenderer sudokuRenderer;
+	private final LeaderboardRenderer leaderboardRenderer;
+	private final TimerRenderer timerRenderer;
+	private final MultiPlayerCompleteProgress completeProgress;
 
 	public MultiPlayerDokuView(StateMachine stateMachine, Client client, Server server) {
 		super(stateMachine);
 		this.client = client;
 		this.server = server;
 		this.sudokuRenderer = new SudokuRenderer(this.client.getGame().getDoku());
+		this.leaderboardRenderer = new LeaderboardRenderer(client.getGame(), client.getPlayer());
+		this.sudokuRenderer.onCellChange.connect(this::onCellChange);
 		this.client.onDisconnect.connect(this::onDisconnect);
+		this.client.onGameEnd.connect(this::onGameEnd);
+		this.timerRenderer = new TimerRenderer(this.client.getGame().getStartTime(), this.client.getGame().getGameDuration());
+		this.completeProgress = new MultiPlayerCompleteProgress(this.client.getGame());
+	}
+
+	private void onGameEnd(Player winner) {
+		MultiDoku doku = this.client.getGame().getDoku();
+		doku.clearMutableCells();
+		Solver solver = new BacktrackingSolver();
+		solver.solve(doku);
+		this.stateMachine.overrideState(new EndGameView(stateMachine, doku, winner));
+	}
+
+	private void onCellChange(Cell cell) {
+		this.client.sendCellChange(cell);
 	}
 
 	public void onDisconnect() {
@@ -27,6 +55,9 @@ public class MultiPlayerDokuView extends BaseView{
 
 	@Override
 	public void render() {
+		this.timerRenderer.render();
+		this.leaderboardRenderer.render();
+		this.completeProgress.render();
 		this.sudokuRenderer.render();
 		if (ImGui.button("Quitter")) {
 			this.client.stop();

app/src/main/java/gui/menu/MultiPlayerView.java

@@ -1,23 +1,33 @@
 package gui.menu;
 
 import game.Player;
+import gui.widget.SudokuSelector;
 import imgui.ImGui;
+import imgui.type.ImInt;
 import network.client.Client;
 import network.server.Server;
 import sudoku.structure.MultiDoku;
-import sudoku.structure.SudokuFactory;
 
 public class MultiPlayerView extends BaseView {
 
 	private final Client client;
 	private final Server server;
 
+	private final SudokuSelector selector;
+
+	private ImInt gameDurationMinutes = new ImInt(10);
+
+	private MultiDoku doku = null;
+
 	public MultiPlayerView(StateMachine stateMachine, Client client, Server server) {
 		super(stateMachine);
 		this.client = client;
 		this.server = server;
+		this.selector = new SudokuSelector(false, "Sélectionner le sudoku");
+		this.selector.onSelect.connect(this::onSelected);
 		this.client.onDisconnect.connect(this::onDisconnect);
-		this.client.onGameStarted.connect(() -> this.stateMachine.pushState(new MultiPlayerDokuView(stateMachine, client, server)));
+		this.client.onGameStarted
+				.connect(() -> this.stateMachine.pushState(new MultiPlayerDokuView(stateMachine, client, server)));
 	}
 
 	@Override
@@ -30,26 +40,41 @@ public class MultiPlayerView extends BaseView {
 		this.stateMachine.popState();
 	}
 
+	private void onSelected(MultiDoku doku) {
+		this.doku = doku;
+	}
+
 	public void renderGameStatus() {
 		if (this.server == null) {
 			ImGui.text("En attente de l'administrateur du serveur ...");
 		} else {
+			renderTimer();
+			ImGui.beginDisabled(this.doku == null);
 			if (ImGui.button("Démarrer")) {
-				// temp
+				this.server.startGame(this.doku, this.gameDurationMinutes.get() * 60);
-				MultiDoku doku = SudokuFactory.createBasicSquareMultidoku(3);
-				this.server.startGame(doku);
 			}
+			ImGui.endDisabled();
+			selector.render();
 		}
 	}
 
-	@Override
+	private void renderPlayers() {
-	public void render() {
 		ImGui.text("Joueurs :");
 		{
 			for (Player player : this.client.getGame().getPlayers().values()) {
 				ImGui.bulletText(player.getPseudo());
 			}
 		}
+	}
+
+	private void renderTimer() {
+		if (ImGui.inputInt("Temps de la partie (minutes)", gameDurationMinutes))
+			gameDurationMinutes.set(Math.clamp(gameDurationMinutes.get(), 1, 90));
+	}
+
+	@Override
+	public void render() {
+		renderPlayers();
 		renderGameStatus();
 	}
 

app/src/main/java/gui/menu/OptionsMenu.java

@@ -1,17 +1,28 @@
 package gui.menu;
 
+import gui.constants.Options;
+import gui.constants.Symbols;
 import imgui.ImGui;
+import imgui.type.ImInt;
 
 public class OptionsMenu extends BaseView {
 
+	private ImInt currentValue = new ImInt();
+	private float backgroundSpeed[] = new float[]{Options.BackgroundSpeed};
+
 	public OptionsMenu(StateMachine stateMachine) {
 		super(stateMachine);
 	}
 
 	@Override
 	public void render() {
-		// TODO Auto-generated method stub
 		ImGui.text("Options");
+		if(ImGui.combo("Jeu de symboles", currentValue, Symbols.getSymbolsNames())){
+			Options.Symboles = Symbols.values()[currentValue.get()];
+		}
+		if(ImGui.sliderFloat("Vitesse d'animation de l'arrière plan", backgroundSpeed, 0.0f, 10.0f)){
+			Options.BackgroundSpeed = backgroundSpeed[0];
+		}
 		renderReturnButton();
 	}
 

app/src/main/java/gui/menu/SoloMenu.java

@@ -1,93 +1,27 @@
 package gui.menu;
 
+import gui.widget.SudokuSelector;
 import imgui.ImGui;
-import imgui.type.ImInt;
-import sudoku.solver.Solver;
-import sudoku.structure.Cell;
 import sudoku.structure.MultiDoku;
-import sudoku.structure.Sudoku;
-import sudoku.structure.SudokuFactory;
 
 public class SoloMenu extends BaseView {
 
-	private final ImInt sudokuType = new ImInt(0);
+	private final SudokuSelector sudokuSelector;
-	private static final String[] sudokuTypes = { "Carré", "Rectangle", "Multidoku" };
-	private static final int SQUARE = 0, RECTANGLE = 1, MULTIDOKU = 2;
-
-	private final ImInt sudokuSize = new ImInt(3);
-
-	private final ImInt sudokuWidth = new ImInt(3);
-	private final ImInt sudokuHeight = new ImInt(3);
 
 	public SoloMenu(StateMachine stateMachine) {
 		super(stateMachine);
+		this.sudokuSelector = new SudokuSelector(true, "Résoudre le sudoku");
+		this.sudokuSelector.onSelect.connect(this::pushSudokuState);
 	}
 
-	private void pushSudokuState(MultiDoku doku, boolean empty) {
+	private void pushSudokuState(MultiDoku doku) {
-		if (!empty) {
-			try {
-				int level = 0;
-				for (Sudoku sudoku : doku.getSubGrids()) {
-					level += sudoku.getSize() * sudoku.getSize() / 10 * 3;
-				}
-				Solver.solve(doku);
-				level = (level - 1) / doku.getNbSubGrids();
-				SudokuFactory.newDokuFromFilledOne(doku, level);
-				for (Sudoku sudoku : doku.getSubGrids()) {
-					for (Cell cell : sudoku.getCells()) {
-						if (cell.getSymbolIndex() != Cell.NOSYMBOL) {
-							cell.setImmutable();
-						}
-					}
-				}
-			} catch (Exception e) {
-				e.printStackTrace();
-			}
-		}
 		this.stateMachine.pushState(new SudokuView(stateMachine, doku));
 	}
 
 	@Override
 	public void render() {
 		ImGui.text("Solo");
-		ImGui.combo("Type de Sudoku", sudokuType, sudokuTypes);
+		sudokuSelector.render();
-		switch (sudokuType.get()) {
-			case SQUARE:
-				ImGui.inputInt("Taille", sudokuSize);
-				if (ImGui.button("Résoudre un sudoku")) {
-					pushSudokuState(SudokuFactory.createBasicEmptySquareSudoku(sudokuSize.get()), false);
-				}
-				if (ImGui.button("Générer une grille vide")) {
-					pushSudokuState(SudokuFactory.createBasicEmptySquareSudoku(sudokuSize.get()), true);
-				}
-				break;
-
-			case RECTANGLE:
-				ImGui.inputInt("Largeur", sudokuHeight);
-				ImGui.inputInt("Longueur", sudokuWidth);
-				if (ImGui.button("Résoudre un sudoku")) {
-					pushSudokuState(
-							SudokuFactory.createBasicEmptyRectangleSudoku(sudokuWidth.get(), sudokuHeight.get()),
-							false);
-				}
-				if (ImGui.button("Générer une grille vide")) {
-					pushSudokuState(
-							SudokuFactory.createBasicEmptyRectangleSudoku(sudokuWidth.get(), sudokuHeight.get()), true);
-				}
-				break;
-
-			case MULTIDOKU:
-				ImGui.inputInt("Taille", sudokuSize);
-				if (ImGui.button("Résoudre un sudoku")) {
-					pushSudokuState(SudokuFactory.createBasicSquareMultidoku(sudokuSize.get()), false);
-				}
-				if (ImGui.button("Générer une grille vide")) {
-					pushSudokuState(SudokuFactory.createBasicSquareMultidoku(sudokuSize.get()), true);
-				}
-
-			default:
-				break;
-		}
 		renderReturnButton();
 	}
 

app/src/main/java/gui/menu/StateMachine.java

@@ -2,6 +2,7 @@ package gui.menu;
 
 import java.util.Stack;
 
+import gui.widget.AnimatedBackground;
 import imgui.ImGui;
 import imgui.ImVec2;
 import imgui.flag.ImGuiKey;
@@ -10,9 +11,11 @@ import imgui.flag.ImGuiWindowFlags;
 public class StateMachine {
 
 	private final Stack<BaseView> menus;
+	private final AnimatedBackground background;
 
 	public StateMachine() {
 		this.menus = new Stack<>();
+		this.background = new AnimatedBackground();
 	}
 
 	public void clear() {
@@ -26,6 +29,11 @@ public class StateMachine {
 		menus.add(menu);
 	}
 
+	public void overrideState(BaseView menu) {
+		menus.getLast().cleanResources();
+		menus.set(menus.size() - 1, menu);
+	}
+
 	public void popState() {
 		menus.getLast().cleanResources();
 		menus.pop();
@@ -39,6 +47,7 @@ public class StateMachine {
 
 	public void render() {
 		var displaySize = ImGui.getIO().getDisplaySize();
+		this.background.render();
 		ImGui.setNextWindowPos(new ImVec2(0.0f, 0.0f));
 		ImGui.setNextWindowSize(displaySize);
 		ImGui.begin("##Main Window", null, ImGuiWindowFlags.NoDecoration | ImGuiWindowFlags.NoMove

app/src/main/java/gui/menu/SudokuView.java

@@ -1,11 +1,20 @@
 package gui.menu;
 
-import java.util.Random;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.CancellationException;
 
-import gui.SudokuRenderer;
+import gui.widget.SudokuRenderer;
 import imgui.ImGui;
+import imgui.ImGuiStyle;
+import sudoku.io.SudokuSerializer;
+import sudoku.solver.BacktrackingSolver;
+import sudoku.solver.HintHelper;
+import sudoku.solver.HumanSolver;
+import sudoku.solver.MixedSolver;
 import sudoku.solver.Solver;
+import sudoku.solver.SolverStep;
+import sudoku.solver.HintHelper.Hint;
 import sudoku.structure.MultiDoku;
 
 public class SudokuView extends BaseView {
@@ -13,30 +22,21 @@ public class SudokuView extends BaseView {
 	private final SudokuRenderer sudokuRenderer;
 	private Thread resolveThread;
 	private final MultiDoku doku;
+	private String lastSavePath = null;
+
+	private boolean resolved = false;
+	// if the solver can't solve
+	private volatile boolean unresolved = false;
 
 	public SudokuView(StateMachine stateMachine, MultiDoku doku) {
 		super(stateMachine);
 		this.doku = doku;
 		this.sudokuRenderer = new SudokuRenderer(doku);
-		// int level = 0;
+		this.sudokuRenderer.onResolve.connect(this::onResolve);
-		// for (Sudoku sudoku : this.doku.getSubGrids()) {
+	}
-		// 	level += sudoku.getSize() * sudoku.getSize() / 10;
+
-		// }
+	private void onResolve() {
-		// try {
+		this.resolved = true;
-		// 	Solver.solve(doku);
-		// 	SudokuFactory.newDokuFromFilledOne(doku, level);
-		// 	for (Sudoku sudoku : this.doku.getSubGrids()) {
-		// 		for (Cell cell : sudoku.getCells()) {
-		// 			if (cell.getSymbolIndex() != Cell.NOSYMBOL) {
-		// 				cell.setImmutable();
-		// 			}
-		// 		}
-		// 	}
-		// } catch (Exception e) {
-		// 	e.printStackTrace();
-		// 	System.out.println("non ça n'arrivera pas");
-		// 	//TODO: ça va arriver
-		// }
 	}
 
 	private void stopResolve() {
@@ -46,11 +46,24 @@ public class SudokuView extends BaseView {
 		}
 	}
 
+	boolean centeredButton(String label) {
+		ImGuiStyle style = ImGui.getStyle();
+
+		float size = ImGui.calcTextSizeX(label) + style.getFramePaddingX() * 2.0f;
+		float avail = ImGui.getContentRegionAvailX();
+
+		float off = (avail - size) * 0.5f;
+		if (off > 0.0f)
+			ImGui.setCursorPosX(ImGui.getCursorPosX() + off);
+
+		return ImGui.button(label);
+	}
+
 	private void renderCancelButton() {
 		boolean wantsToStop = false;
 		if (resolveThread != null && resolveThread.isAlive()) {
 			// ImGui.endDisabled();
-			if (ImGui.button("Annuler")) {
+			if (centeredButton("Annuler")) {
 				// we can't stop the Thread right now
 				wantsToStop = true;
 			}
@@ -62,36 +75,99 @@ public class SudokuView extends BaseView {
 			stopResolve();
 	}
 
+	private void renderHintButton() {
+		if (!this.resolved && centeredButton("Indice")) {
+			Hint hint = HintHelper.getHint(this.doku, new BacktrackingSolver());
+			assert (hint != null);
+			hint.cell().setSymbolIndex(hint.newValue());
+			if (this.doku.isSolved())
+				this.sudokuRenderer.onResolve.emit();
+		}
+	}
+
+	private void renderUnsolvableText() {
+		if (this.unresolved)
+			ImGui.text("Impossible de résoudre avec l'algorithme actuel !");
+
+	}
+
+	private void startSolve(Solver solver) {
+		resolveThread = new Thread(() -> {
+			List<SolverStep> steps = new ArrayList<>();
+			try {
+				unresolved = !solver.solve(this.doku, steps);
+			} catch (CancellationException e) {
+				System.out.println("The user is bored !");
+			}
+			stopResolve();
+		});
+	}
+
+	private void renderResolvedText() {
+		if (this.resolved)
+			ImGui.text("Bravo !");
+	}
+
+	private void renderSolvePopup() {
+		if (ImGui.beginPopup("solve")) {
+			if (ImGui.button("Résoudre avec backtrace")) {
+				startSolve(new BacktrackingSolver());
+				ImGui.closeCurrentPopup();
+			}
+			if (ImGui.button("Résoudre avec déduction")) {
+				startSolve(new HumanSolver());
+				ImGui.closeCurrentPopup();
+			}
+			if (ImGui.button("Résoudre avec déduction et backtrace")) {
+				startSolve(new MixedSolver());
+				ImGui.closeCurrentPopup();
+			}
+			ImGui.endPopup();
+		}
+	}
+
 	private void renderSolveButton() {
 		if (resolveThread != null)
 			ImGui.beginDisabled();
 
-		boolean beginSolve = false;
+		if (!this.resolved && centeredButton("Résoudre")) {
-		
+			ImGui.openPopup("solve");
-		if (ImGui.button("Résoudre")) {
-			beginSolve = true;
 		}
+
 		if (resolveThread != null)
 			ImGui.endDisabled();
 
-		if (beginSolve) {
+		renderResolvedText();
-			resolveThread = new Thread(() -> {
+		renderUnsolvableText();
-				try {
+
-					Random rand = new Random();
+		renderSolvePopup();
-					Solver.solveRandom(doku, rand);
+	}
-					Thread.sleep(200);
+
-				} catch (CancellationException | InterruptedException e) {
+	private void renderSaveButton() {
-					System.out.println("The user is bored !");
+		if (ImGui.button("Sauvegarder l'état de la grille")) {
-				}
+			lastSavePath = SudokuSerializer.saveMultiDoku(doku);
-				stopResolve();
+			ImGui.openPopup("saveDone");
-			});
+		}
+		if (ImGui.beginPopup("saveDone")) {
+			ImGui.text("Sudoku sauvegardé dans ");
+			ImGui.text(lastSavePath);
+			ImGui.endPopup();
+		}
+	}
+
+	private void renderClearButton() {
+		if (centeredButton("Effacer")) {
+			this.doku.clearMutableCells();
 		}
 	}
 
 	@Override
 	public void render() {
 		sudokuRenderer.render();
+		renderHintButton();
+		renderClearButton();
 		renderSolveButton();
+		renderSaveButton();
 		renderCancelButton();
 		renderReturnButton();
 	}

app/src/main/java/gui/widget/AnimatedBackground.java

@@ -0,0 +1,32 @@
+package gui.widget;
+
+import gui.constants.Images;
+import gui.constants.Options;
+import imgui.ImGui;
+import imgui.ImVec2;
+import imgui.flag.ImGuiWindowFlags;
+
+public class AnimatedBackground {
+
+	private float backgroundOffset = 0;
+
+	private static final float defaultSpeed = 0.05f;
+
+	public AnimatedBackground() {
+
+	}
+
+	public void render() {
+		backgroundOffset += ImGui.getIO().getDeltaTime() * defaultSpeed * Options.BackgroundSpeed;
+		var displaySize = ImGui.getIO().getDisplaySize();
+		ImGui.setNextWindowPos(new ImVec2(0.0f, 0.0f));
+		ImGui.setNextWindowSize(displaySize);
+		ImGui.begin("Background", null, ImGuiWindowFlags.NoDecoration | ImGuiWindowFlags.NoMove
+				| ImGuiWindowFlags.NoSavedSettings | ImGuiWindowFlags.NoBackground
+				| ImGuiWindowFlags.NoBringToFrontOnFocus | ImGuiWindowFlags.NoInputs);
+		ImGui.image(Images.BACKGROUND, displaySize, new ImVec2(backgroundOffset, backgroundOffset),
+				new ImVec2(1.0f + backgroundOffset, 1.0f + backgroundOffset));
+		ImGui.end();
+	}
+
+}

app/src/main/java/gui/widget/LeaderboardRenderer.java

@@ -0,0 +1,73 @@
+package gui.widget;
+
+import game.Game;
+import game.Player;
+import imgui.ImGui;
+import imgui.ImVec2;
+import imgui.ImVec4;
+import imgui.flag.ImGuiCol;
+import imgui.flag.ImGuiStyleVar;
+
+public class LeaderboardRenderer {
+
+	private final Game game;
+	private final Player currentPlayer;
+
+	private final float cellHeight = 75;
+	private final ImVec2 cellSize = new ImVec2(12 * cellHeight, cellHeight);
+	private final ImVec2 rankSize = new ImVec2(cellHeight, cellHeight);
+	private final ImVec2 scoreSize = rankSize;
+	private final ImVec2 nameSize = new ImVec2(cellSize.x - cellHeight * 2.0f, cellHeight);
+	private final ImVec4 cellColorPlayer = new ImVec4(0.20f, 0.67f, 1.0f, 0.5f);
+	private final ImVec4 cellColorEnemy = new ImVec4(1.0f, 0.0f, 0.0f, 0.5f);
+	private final int maxPlayersShowed = 2;
+
+	private final int emptyCellCount;
+
+	public LeaderboardRenderer(Game game, Player player) {
+		this.game = game;
+		this.currentPlayer = player;
+		this.emptyCellCount = game.getDoku().getEmptyCells().size();
+	}
+
+	private void renderRank(int rank) {
+		ImGui.button(Integer.toString(rank), rankSize);
+	}
+
+	private void renderName(String name) {
+		ImGui.button(name, nameSize);
+	}
+
+	private void renderScore(int score) {
+		ImGui.button(Integer.toString(score), scoreSize);
+	}
+
+	private void renderCell(Player player, int rank, ImVec4 color) {
+		ImGui.pushStyleColor(ImGuiCol.Button, color);
+		ImGui.pushStyleColor(ImGuiCol.ButtonHovered, color);
+		ImGui.pushStyleColor(ImGuiCol.ButtonActive, color);
+		ImGui.beginChild(player.getPseudo() + "##" + player.getId(), cellSize);
+		renderRank(rank);
+		ImGui.sameLine();
+		renderName(player.getPseudo());
+		ImGui.sameLine();
+		renderScore(emptyCellCount - player.getRemainingCells());
+		ImGui.endChild();
+		ImGui.popStyleColor(3);
+	}
+
+	public void render() {
+		var displaySize = ImGui.getIO().getDisplaySize();
+		ImGui.setCursorPosX(displaySize.x / 2.0f - cellSize.x / 2.0f);
+		ImGui.beginChild("Leaderboard", new ImVec2(cellSize.x + 15.0f, cellHeight * maxPlayersShowed));
+		ImGui.pushStyleVar(ImGuiStyleVar.ItemSpacing, new ImVec2());
+		ImGui.pushStyleVar(ImGuiStyleVar.FrameBorderSize, 3.0f);
+		for (int i = 0; i < game.getLeaderboard().size(); i++) {
+			Player player = game.getLeaderboard().get(i);
+			renderCell(player, i + 1, player == currentPlayer ? cellColorPlayer : cellColorEnemy);
+		}
+		ImGui.popStyleVar(2);
+		ImGui.endChild();
+	}
+
+}

app/src/main/java/gui/widget/MultiPlayerCompleteProgress.java

@@ -0,0 +1,28 @@
+package gui.widget;
+
+import game.Game;
+import game.Player;
+import imgui.ImGui;
+import imgui.ImVec2;
+
+public class MultiPlayerCompleteProgress {
+
+	private final Game game;
+	private final int emptyCellCount;
+	private final ImVec2 progressSize = new ImVec2(700, 50);
+	private final SmoothProgressBar progressBar;
+
+	public MultiPlayerCompleteProgress(Game game) {
+		this.game = game;
+		this.emptyCellCount = game.getDoku().getEmptyCells().size();
+		this.progressBar = new SmoothProgressBar();
+	}
+
+	public void render() {
+		Player firstPlayer = game.getLeaderboard().getFirst();
+		ImGui.setCursorPosX(ImGui.getIO().getDisplaySizeX() / 2.0f - progressSize.x / 2.0f);
+		String progressText = firstPlayer.getPseudo() + " - " + (emptyCellCount - firstPlayer.getRemainingCells()) + "/" + emptyCellCount;
+		this.progressBar.render(progressText, progressSize, 1.0f - firstPlayer.getRemainingCells() / (float) emptyCellCount);
+	}
+
+}

app/src/main/java/gui/widget/SmoothProgressBar.java

@@ -0,0 +1,21 @@
+package gui.widget;
+
+import imgui.ImGui;
+import imgui.ImVec2;
+
+public class SmoothProgressBar {
+
+	private float lastProgress = 0;
+	private final float speed = 2.0f;
+	private final float clipConstant = 0.001f;
+
+	public void render(String label, ImVec2 size, float progress) {
+		float delta = progress - lastProgress;
+		if (Math.abs(delta) < clipConstant)
+			lastProgress = progress;
+		else
+			lastProgress = lastProgress + delta * ImGui.getIO().getDeltaTime() * speed;
+		ImGui.progressBar(lastProgress, size, label);
+	}
+
+}

app/src/main/java/gui/widget/SudokuRenderer.java

@@ -0,0 +1,157 @@
+package gui.widget;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import common.ConsumerSignal;
+import common.Signal;
+import gui.ColorGenerator;
+import gui.ColorGenerator.Color;
+import gui.RenderableMultidoku;
+import gui.constants.Fonts;
+import gui.constants.Options;
+import gui.constants.Symbols;
+import imgui.ImGui;
+import imgui.ImVec2;
+import imgui.ImVec4;
+import imgui.flag.ImGuiCol;
+import imgui.flag.ImGuiStyleVar;
+import sudoku.constraint.Constraint;
+import sudoku.structure.Block;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.Sudoku;
+
+public class SudokuRenderer {
+
+	private final RenderableMultidoku doku;
+	private Cell currentCell = null;
+	private final Map<Block, Color> colorPalette;
+
+	private static final ImVec4 BLACK = new ImVec4(0, 0, 0, 1);
+	private static final ImVec4 TRANSPARENT = new ImVec4();
+	private static final ImVec4 WHITE = new ImVec4(1.0f, 1.0f, 1.0f, 1.0f);
+	private static final ImVec2 cellSize = new ImVec2(50, 50);
+
+	private final Set<Cell> diagonals = new HashSet<>();
+
+	public final Signal onResolve = new Signal();
+	public final ConsumerSignal<Cell> onCellChange = new ConsumerSignal<>();
+
+	public SudokuRenderer(MultiDoku doku) {
+		this.doku = RenderableMultidoku.fromMultidoku(doku);
+		this.colorPalette = initColors();
+		initDiagonals();
+	}
+
+	private void initDiagonals() {
+		for (Sudoku sudoku : this.doku.getDoku().getSubGrids()) {
+			if (sudoku.hasConstraint(Constraint.Diagonal)) {
+				for (int i = 0; i < sudoku.getSize(); i++) {
+					this.diagonals.add(sudoku.getCell(i, i));
+					this.diagonals.add(sudoku.getCell(sudoku.getSize() - i - 1, i));
+				}
+			}
+		}
+	}
+
+	private Map<Block, Color> initColors() {
+		List<Color> colors = ColorGenerator.greatPalette(doku.getBlocks().size());
+		Map<Block, Color> colorPalette = new HashMap<>();
+		int index = 0;
+		for (Block block : doku.getBlocks()) {
+			colorPalette.put(block, colors.get(index));
+			index++;
+		}
+		return colorPalette;
+	}
+
+	private void renderPopup() {
+		if (ImGui.beginPopup("editPopup")) {
+			Block block = currentCell.getBlock();
+			int symbolCount = block.getCells().size();
+			for (int i = 0; i < symbolCount; i++) {
+				if ((i + 1) % (int) (Math.sqrt(symbolCount)) != 1)
+					ImGui.sameLine();
+				if (currentCell.getSymbolIndex() == i) {
+					if (ImGui.button("X", cellSize)) {
+						currentCell.setSymbolIndex(Cell.NOSYMBOL);
+						this.onCellChange.emit(currentCell);
+						ImGui.closeCurrentPopup();
+					}
+				} else {
+					if (ImGui.button(Options.Symboles.getSymbols().get(i), cellSize)) {
+						currentCell.setSymbolIndex(i);
+						this.onCellChange.emit(currentCell);
+						if (this.doku.getDoku().isSolved())
+							this.onResolve.emit();
+						ImGui.closeCurrentPopup();
+					}
+				}
+			}
+			ImGui.endPopup();
+		}
+	}
+
+	public void render() {
+		if (Options.Symboles == Symbols.Russian) {
+			ImGui.pushFont(Fonts.ARIAL);
+		}
+		final float sudokuViewWidth = cellSize.x * doku.getWidth();
+		final float displayWidth = ImGui.getIO().getDisplaySizeX();
+		float offsetX = displayWidth / 2.0f - sudokuViewWidth / 2.0f;
+		// if the grid is too big, don't offset it
+		if (offsetX > 0) {
+			ImGui.setCursorPosX(offsetX);
+		}
+		ImGui.beginChild("sudokuChild", new ImVec2(cellSize.x * doku.getWidth(), cellSize.y * doku.getHeight()));
+
+		ImGui.pushStyleVar(ImGuiStyleVar.FrameBorderSize, 2.0f);
+		ImGui.pushStyleVar(ImGuiStyleVar.ItemSpacing, new ImVec2(0.0f, 0.0f));
+		for (int y = 0; y < doku.getHeight(); y++) {
+			for (int x = 0; x < doku.getWidth(); x++) {
+				if (x > 0)
+					ImGui.sameLine();
+				int index = y * doku.getWidth() + x;
+				Cell cell = doku.getCell(x, y);
+				ImGui.beginDisabled(cell == null);
+				if (cell == null) {
+					ImGui.pushStyleColor(ImGuiCol.Border, TRANSPARENT);
+					ImGui.pushStyleColor(ImGuiCol.Button, TRANSPARENT);
+					ImGui.button("##" + index, cellSize);
+				} else {
+					if (diagonals.contains(cell)) {
+						ImGui.pushStyleColor(ImGuiCol.Border, WHITE);
+					} else {
+						ImGui.pushStyleColor(ImGuiCol.Border, BLACK);
+					}
+					int symbol = cell.getSymbolIndex();
+					Color blockColor = colorPalette.get(cell.getBlock());
+					if (!cell.isMutable()) {
+						blockColor = new Color(blockColor.r - 0.20f, blockColor.g - 0.20f, blockColor.b - 0.20f);
+					}
+					ImGui.pushStyleColor(ImGuiCol.Button, new ImVec4(blockColor.r, blockColor.g, blockColor.b, 1.0f));
+					String cellText = "";
+					if (symbol != -1)
+						cellText += Options.Symboles.getSymbols().get(symbol);
+					if (ImGui.button(cellText + "##" + index, cellSize) && cell.isMutable()) {
+						ImGui.openPopup("editPopup");
+						currentCell = cell;
+					}
+				}
+				ImGui.endDisabled();
+				ImGui.popStyleColor(2);
+			}
+		}
+		ImGui.popStyleVar(2);
+		renderPopup();
+		ImGui.endChild();
+		if (Options.Symboles == Symbols.Russian) {
+			ImGui.popFont();
+		}
+	}
+
+}

app/src/main/java/gui/widget/SudokuSelector.java

@@ -0,0 +1,137 @@
+package gui.widget;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import common.ConsumerSignal;
+import gui.constants.SudokuType;
+import imgui.ImGui;
+import imgui.extension.imguifiledialog.ImGuiFileDialog;
+import imgui.extension.imguifiledialog.flag.ImGuiFileDialogFlags;
+import imgui.type.ImBoolean;
+import imgui.type.ImInt;
+import sudoku.constraint.Constraint;
+import sudoku.constraint.IConstraint;
+import sudoku.structure.Difficulty;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.SudokuFactory;
+
+public class SudokuSelector {
+
+	public final ConsumerSignal<MultiDoku> onSelect = new ConsumerSignal<>();
+	private MultiDoku doku;
+
+	private final boolean canGenEmptyGrid;
+
+	private final ImInt sudokuType = new ImInt(0);
+
+	private final ImInt difficulty = new ImInt(Difficulty.Easy.ordinal());
+	private final List<ImBoolean> contraints = new ArrayList<>();
+
+	private final ImInt sudokuSize = new ImInt(3);
+
+	private final ImInt sudokuWidth = new ImInt(3);
+	private final ImInt sudokuHeight = new ImInt(3);
+
+	private final String confirmMessage;
+
+	public SudokuSelector(boolean canGenEmptyGrid, String confirmMessage) {
+		this.canGenEmptyGrid = canGenEmptyGrid;
+		this.confirmMessage = confirmMessage;
+		initConstraints();
+	}
+
+	private List<IConstraint> getConstraints() {
+		List<IConstraint> constraints = new ArrayList<>();
+		for (int i = 0; i < this.contraints.size(); i++) {
+			if (this.contraints.get(i).get())
+				constraints.add(Constraint.values()[i].getConstraint());
+		}
+		return constraints;
+	}
+
+	private void initConstraints() {
+		for (Constraint cons : Constraint.values()) {
+			contraints.add(new ImBoolean(SudokuFactory.DEFAULT_CONSTRAINTS.contains(cons.getConstraint())));
+		}
+	}
+
+	private void selectSudoku(MultiDoku doku, boolean empty) {
+		this.doku = doku;
+		if (!empty) {
+			try {
+				SudokuFactory.fillDoku(doku, Difficulty.values()[difficulty.get()]);
+			} catch (Exception e) {
+				e.printStackTrace();
+			}
+		}
+		this.onSelect.emit(this.doku);
+	}
+
+	public void renderFileDialog() {
+		if (ImGuiFileDialog.display("browse-sudoku", ImGuiFileDialogFlags.None)) {
+			if (ImGuiFileDialog.isOk()) {
+				var selection = ImGuiFileDialog.getSelection();
+				for (var entry : selection.entrySet()) {
+					try {
+						String filePath = entry.getValue();
+						this.doku = SudokuFactory.fromfile(filePath);
+						if (this.doku != null)
+							this.onSelect.emit(this.doku);
+					} catch (Exception e) {
+						e.printStackTrace();
+					}
+				}
+			}
+			ImGuiFileDialog.close();
+		}
+	}
+
+	public void render() {
+		ImGui.combo("Difficulté", difficulty, Difficulty.getDifficultyNames());
+		if (ImGui.treeNode("Constraintes")) {
+			for (Constraint cons : Constraint.values()) {
+				ImGui.checkbox(cons.getDisplayName(), contraints.get(cons.ordinal()));
+			}
+			ImGui.treePop();
+		}
+		ImGui.combo("Type de Sudoku", sudokuType, SudokuType.getTypeNames());
+		SudokuType currentType = SudokuType.values()[sudokuType.get()];
+		switch (currentType.getMakerParamCount()) {
+			case 1:
+				if (ImGui.inputInt("Taille", sudokuSize))
+					sudokuSize.set(Math.clamp(sudokuSize.get(), 1, 10));
+				if (ImGui.button(confirmMessage)) {
+					selectSudoku(currentType.createDoku(getConstraints(), sudokuSize.get()), false);
+				}
+				if (canGenEmptyGrid && ImGui.button("Générer une grille vide")) {
+					selectSudoku(currentType.createDoku(getConstraints(), sudokuSize.get()), true);
+				}
+				break;
+
+			case 2:
+				if (ImGui.inputInt("Longueur", sudokuWidth))
+					sudokuWidth.set(Math.clamp(sudokuWidth.get(), 1, 10));
+				if (ImGui.inputInt("Hauteur", sudokuHeight))
+					sudokuHeight.set(Math.clamp(sudokuHeight.get(), 1, 10));
+				if (ImGui.button(confirmMessage)) {
+					selectSudoku(currentType.createDoku(getConstraints(), sudokuWidth.get(), sudokuHeight.get()),
+							false);
+				}
+				if (canGenEmptyGrid && ImGui.button("Générer une grille vide")) {
+					selectSudoku(currentType.createDoku(getConstraints(), sudokuWidth.get(), sudokuHeight.get()), true);
+				}
+				break;
+
+			default:
+				assert (false);
+				break;
+		}
+
+		if (ImGui.button("À partir d'un fichier")) {
+			ImGuiFileDialog.openDialog("browse-sudoku", "Choisissez un fichier", ".json", ".");
+		}
+		renderFileDialog();
+	}
+
+}

app/src/main/java/gui/widget/TimerRenderer.java

@@ -0,0 +1,29 @@
+package gui.widget;
+
+import java.time.Instant;
+
+import imgui.ImGui;
+
+public class TimerRenderer {
+
+	private final long endTime;
+
+	public TimerRenderer(Instant startTime, long duration) {
+		this.endTime = startTime.getEpochSecond() + duration;
+	}
+
+	private long getTimeRemaining() {
+		long currentTime = Instant.now().getEpochSecond();
+		return endTime - currentTime;
+	}
+
+	public void render() {
+		long seconds = getTimeRemaining();
+		long minutes = seconds / 60;
+		String text = String.format("%02d:%02d", minutes, seconds % 60);
+		var textSize = ImGui.calcTextSize(text);
+		ImGui.setCursorPosX(ImGui.getIO().getDisplaySizeX() / 2.0f - textSize.x / 2.0f);
+		ImGui.text(text);
+	}
+
+}

app/src/main/java/network/ConnexionThread.java

@@ -22,7 +22,7 @@ public class ConnexionThread extends Thread {
 				// System.out.println(objectInputStream.available());
 				Object o = objectInputStream.readObject();
 				if (o instanceof Packet packet) {
-					connexion.visitPacket(packet);
+					connexion.visit(packet);
 				}
 			} catch (ClassNotFoundException | IOException e) {
 				e.printStackTrace();

app/src/main/java/network/client/Client.java

@@ -4,10 +4,15 @@ import java.io.IOException;
 import java.net.UnknownHostException;
 import java.util.Random;
 
+import common.ConsumerSignal;
 import common.Signal;
 import game.Game;
 import game.Player;
+import network.protocol.packets.ChangeCellPacket;
 import network.protocol.packets.LoginPacket;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.Sudoku;
 
 public class Client {
 	private final ClientConnexion clientConnection;
@@ -17,6 +22,9 @@ public class Client {
 	public final Signal onDisconnect = new Signal();
 	public final Signal onClosed = new Signal();
 	public final Signal onGameStarted = new Signal();
+	public final ConsumerSignal<Player> onGameEnd = new ConsumerSignal<>();
+
+	Player player;
 
 	String disconnectReason = null;
 
@@ -54,4 +62,20 @@ public class Client {
 		stop();
 	}
 
+	public void sendCellChange(Cell cell) {
+		MultiDoku doku = getGame().getDoku();
+		for (int sudokuIndex = 0; sudokuIndex < doku.getNbSubGrids(); sudokuIndex++) {
+			Sudoku sudoku = doku.getSubGrid(sudokuIndex);
+			int cellIndex = sudoku.getCells().indexOf(cell);
+			if (cellIndex != -1) {
+				this.clientConnection.sendPacket(new ChangeCellPacket(sudokuIndex, cellIndex, cell.getSymbolIndex()));
+				return;
+			}
+		}
+	}
+
+	public Player getPlayer() {
+		return player;
+	}
+
 }

app/src/main/java/network/client/ClientConnexion.java

@@ -6,19 +6,21 @@ import java.net.UnknownHostException;
 
 import game.Player;
 import network.Connexion;
+import network.protocol.packets.ChangeCellPacket;
 import network.protocol.packets.ConnexionInfoPacket;
 import network.protocol.packets.DisconnectPacket;
+import network.protocol.packets.EndGamePacket;
 import network.protocol.packets.KeepAlivePacket;
 import network.protocol.packets.LoginPacket;
 import network.protocol.packets.PlayerJoinPacket;
 import network.protocol.packets.PlayerLeavePacket;
 import network.protocol.packets.StartGamePacket;
+import network.protocol.packets.UpdatePlayerScorePacket;
 import sudoku.io.SudokuSerializer;
 
 public class ClientConnexion extends Connexion {
 
 	private final Client client;
-	private Player player = null;
 
 	public ClientConnexion(String address, short port, Client client) throws UnknownHostException, IOException {
 		super(new Socket(address, port));
@@ -35,7 +37,7 @@ public class ClientConnexion extends Connexion {
 
 	@Override
 	public void visitPacket(ConnexionInfoPacket packet) {
-		this.player = this.client.getGame().getPlayerById(packet.getConnectionId());
+		this.client.player = this.client.getGame().getPlayerById(packet.getConnectionId());
 		client.onConnect.emit();
 	}
 
@@ -69,8 +71,28 @@ public class ClientConnexion extends Connexion {
 
 	@Override
 	public void visitPacket(StartGamePacket packet) {
-		this.client.getGame().startGame(SudokuSerializer.deserializeSudoku(packet.getSerializedSudoku()));
+		this.client.getGame().startGame(SudokuSerializer.deserializeSudoku(packet.getSerializedSudoku()),
+				packet.getInstant(), packet.getGameDuration());
 		this.client.onGameStarted.emit();
 	}
 
+	@Override
+	public void visitPacket(EndGamePacket packet) {
+		Player winner = this.client.getGame().getLeaderboard().getFirst();
+		this.client.getGame().stopGame();
+		this.client.onGameEnd.emit(winner);
+	}
+
+	@Override
+	public void visitPacket(UpdatePlayerScorePacket packet) {
+		Player player = this.client.getGame().getPlayerById(packet.getPlayerId());
+		assert (player != null);
+		this.client.getGame().setPlayerRemainingCells(player, packet.getCellsLeft());
+	}
+
+	@Override
+	public void visitPacket(ChangeCellPacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacketChangeCell'");
+	}
+
 }

app/src/main/java/network/protocol/PacketVisitor.java

@@ -1,16 +1,19 @@
 package network.protocol;
 
+import network.protocol.packets.ChangeCellPacket;
 import network.protocol.packets.ConnexionInfoPacket;
 import network.protocol.packets.DisconnectPacket;
+import network.protocol.packets.EndGamePacket;
 import network.protocol.packets.KeepAlivePacket;
 import network.protocol.packets.LoginPacket;
 import network.protocol.packets.PlayerJoinPacket;
 import network.protocol.packets.PlayerLeavePacket;
 import network.protocol.packets.StartGamePacket;
+import network.protocol.packets.UpdatePlayerScorePacket;
 
 public interface PacketVisitor {
 
-	default void visitPacket(Packet packet) {
+	default void visit(Packet packet) {
 		packet.accept(this);
 	}
 	
@@ -21,5 +24,8 @@ public interface PacketVisitor {
 	void visitPacket(PlayerJoinPacket packet);
 	void visitPacket(PlayerLeavePacket packet);
 	void visitPacket(StartGamePacket packet);
+	void visitPacket(EndGamePacket packet);
+	void visitPacket(UpdatePlayerScorePacket packet);
+	void visitPacket(ChangeCellPacket packet);
 	
 }

app/src/main/java/network/protocol/Packets.java

@@ -2,6 +2,6 @@ package network.protocol;
 
 public enum Packets {
 
-	ConnectionInfo, KeepAlive, Disconnect, Login, PlayerJoin, PlayerLeave, StartGame
+	ConnectionInfo, KeepAlive, Disconnect, Login, PlayerJoin, PlayerLeave, StartGame, ChangeCell, EndGame, UpdatePlayerScore
 
 }

app/src/main/java/network/protocol/packets/ChangeCellPacket.java

@@ -0,0 +1,38 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+import network.protocol.Packets;
+
+public class ChangeCellPacket extends Packet {
+
+	static private final long serialVersionUID = Packets.ChangeCell.ordinal();
+
+	private final int sudokuIndex;
+	private final int cellIndex;
+	private final int newValue;
+
+	public ChangeCellPacket(int sudokuIndex, int cellIndex, int newValue) {
+		this.sudokuIndex = sudokuIndex;
+		this.cellIndex = cellIndex;
+		this.newValue = newValue;
+	}
+
+	public int getSudokuIndex() {
+		return sudokuIndex;
+	}
+
+	public int getCellIndex() {
+		return cellIndex;
+	}
+
+	public int getNewValue() {
+		return newValue;
+	}
+
+	@Override
+	public void accept(PacketVisitor packetVisitor) {
+		packetVisitor.visitPacket(this);
+	}
+
+}

app/src/main/java/network/protocol/packets/EndGamePacket.java

@@ -0,0 +1,18 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+import network.protocol.Packets;
+
+public class EndGamePacket extends Packet {
+
+	static private final long serialVersionUID = Packets.EndGame.ordinal();
+
+	public EndGamePacket() { }
+
+	@Override
+	public void accept(PacketVisitor packetVisitor) {
+		packetVisitor.visitPacket(this);
+	}
+
+}

app/src/main/java/network/protocol/packets/StartGamePacket.java

@@ -1,5 +1,7 @@
 package network.protocol.packets;
 
+import java.time.Instant;
+
 import network.protocol.Packet;
 import network.protocol.PacketVisitor;
 import network.protocol.Packets;
@@ -9,15 +11,28 @@ public class StartGamePacket extends Packet {
 	static private final long serialVersionUID = Packets.StartGame.ordinal();
 
 	private final String serializedSudoku;
+	// used to resume game
+	private final Instant instant;
+	private final long gameDuration;
 
-	public StartGamePacket(String serializedSudoku) {
+	public StartGamePacket(String serializedSudoku, Instant instant, long gameDuration) {
 		this.serializedSudoku = serializedSudoku;
+		this.instant = instant;
+		this.gameDuration = gameDuration;
 	}
 
 	public String getSerializedSudoku() {
 		return serializedSudoku;
 	}
 
+	public Instant getInstant() {
+		return instant;
+	}
+
+	public long getGameDuration() {
+		return gameDuration;
+	}
+
 	@Override
 	public void accept(PacketVisitor packetVisitor) {
 		packetVisitor.visitPacket(this);

app/src/main/java/network/protocol/packets/UpdatePlayerScorePacket.java

@@ -0,0 +1,32 @@
+package network.protocol.packets;
+
+import network.protocol.Packet;
+import network.protocol.PacketVisitor;
+import network.protocol.Packets;
+
+public class UpdatePlayerScorePacket extends Packet {
+
+	static private final long serialVersionUID = Packets.UpdatePlayerScore.ordinal();
+
+	private final int playerId;
+	private final int cellsLeft;
+
+	public UpdatePlayerScorePacket(int playerId, int cellsLeft) {
+		this.playerId = playerId;
+		this.cellsLeft = cellsLeft;
+	}
+
+	public int getPlayerId() {
+		return playerId;
+	}
+
+	public int getCellsLeft() {
+		return cellsLeft;
+	}
+
+	@Override
+	public void accept(PacketVisitor packetVisitor) {
+		packetVisitor.visitPacket(this);
+	}
+
+}

app/src/main/java/network/server/Server.java

@@ -2,12 +2,15 @@ package network.server;
 
 import java.io.IOException;
 import java.net.ServerSocket;
+import java.time.Instant;
 import java.util.ArrayList;
 import java.util.List;
 
 import game.Game;
 import game.Player;
+import game.Game.GameState;
 import network.protocol.Packet;
+import network.protocol.packets.EndGamePacket;
 import network.protocol.packets.StartGamePacket;
 import sudoku.io.SudokuSerializer;
 import sudoku.structure.MultiDoku;
@@ -37,7 +40,16 @@ public class Server {
 		}
 	}
 
-	public void update() {
+	private void checkTimer() {
+		if (getGame() == null || getGame().getGameState() != GameState.GameGoing)
+			return;
+		long now = Instant.now().getEpochSecond();
+		long end = getGame().getStartTime().getEpochSecond() + getGame().getGameDuration();
+		if (now > end)
+			stopGame();
+	}
+
+	private void checkConnexions() {
 		for (var it = connexions.iterator(); it.hasNext();) {
 			ServerConnexion connexion = it.next();
 			if (!connexion.update()) {
@@ -48,6 +60,11 @@ public class Server {
 		}
 	}
 
+	public void update() {
+		checkTimer();
+		checkConnexions();
+	}
+
 	public void stop() {
 		this.acceptThread.cancel();
 		this.logicThread.cancel();
@@ -68,9 +85,19 @@ public class Server {
 		return game;
 	}
 
-	public void startGame(MultiDoku doku) {
+	public void startGame(MultiDoku doku, long gameDuration) {
-		this.game.startGame(doku);
+		Instant now = Instant.now();
-		broadcastPacket(new StartGamePacket(SudokuSerializer.serializeSudoku(doku).toString()));
+		this.game.startGame(doku, now, gameDuration);
+		for (ServerConnexion connexion : this.connexions) {
+			connexion.setSudoku(doku.clone());
+		}
+		broadcastPacket(new StartGamePacket(SudokuSerializer.serializeSudoku(doku).toString(), now, gameDuration));
+	}
+
+	public void stopGame() {
+		// we don't need to specify the winner since it has to be the first
+		broadcastPacket(new EndGamePacket());
+		getGame().stopGame();
 	}
 
 }

app/src/main/java/network/server/ServerConnexion.java

@@ -3,17 +3,23 @@ package network.server;
 import java.io.IOException;
 import java.net.Socket;
 
+import game.Game;
 import game.Player;
 import game.Game.GameState;
 import network.Connexion;
+import network.protocol.packets.ChangeCellPacket;
 import network.protocol.packets.ConnexionInfoPacket;
 import network.protocol.packets.DisconnectPacket;
+import network.protocol.packets.EndGamePacket;
 import network.protocol.packets.KeepAlivePacket;
 import network.protocol.packets.LoginPacket;
 import network.protocol.packets.PlayerJoinPacket;
 import network.protocol.packets.PlayerLeavePacket;
 import network.protocol.packets.StartGamePacket;
+import network.protocol.packets.UpdatePlayerScorePacket;
 import sudoku.io.SudokuSerializer;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
 
 public class ServerConnexion extends Connexion {
 
@@ -21,6 +27,7 @@ public class ServerConnexion extends Connexion {
 	private final KeepAliveHandler keepAliveHandler;
 	private boolean shouldClose = false;
 	private Player player = null;
+	private MultiDoku doku;
 
 	public ServerConnexion(Socket socket, Server server) throws IOException {
 		super(socket);
@@ -29,7 +36,7 @@ public class ServerConnexion extends Connexion {
 	}
 
 	public boolean update() {
-		if (shouldClose | isClosed())
+		if (shouldClose || isClosed())
 			return false;
 		return this.keepAliveHandler.update();
 	}
@@ -44,7 +51,7 @@ public class ServerConnexion extends Connexion {
 
 	@Override
 	public synchronized void close() {
-		if(shouldClose)
+		if (shouldClose)
 			return;
 		super.close();
 		shouldClose = true;
@@ -54,13 +61,22 @@ public class ServerConnexion extends Connexion {
 	private void finishLogin() {
 		// send players that have already joined (excluding this one)
 		for (Player p : this.server.getGame().getPlayers().values()) {
-			if (p.getId() != player.getId())
+			if (p.getId() != player.getId()) {
 				sendPacket(new PlayerJoinPacket(p));
+				sendPacket(new UpdatePlayerScorePacket(p.getId(), p.getRemainingCells()));
+			}
 		}
+
 		this.server.broadcastPacket(new PlayerJoinPacket(player));
 		sendPacket(new ConnexionInfoPacket(player.getId()));
-		if (this.server.getGame().getGameState() == GameState.GameGoing) {
+
-			sendPacket(new StartGamePacket(SudokuSerializer.serializeSudoku(this.server.getGame().getDoku()).toString()));
+		Game game = this.server.getGame();
+
+		if (game.getGameState() == GameState.GameGoing) {
+			setSudoku(game.getDoku().clone());
+			sendPacket(
+					new StartGamePacket(SudokuSerializer.serializeSudoku(game.getDoku()).toString(),
+							game.getStartTime(), game.getGameDuration()));
 		}
 	}
 
@@ -102,4 +118,50 @@ public class ServerConnexion extends Connexion {
 		throw new UnsupportedOperationException("Unimplemented method 'visitPacketStartGame'");
 	}
 
+	@Override
+	public void visitPacket(EndGamePacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(UpdatePlayerScorePacket packet) {
+		throw new UnsupportedOperationException("Unimplemented method 'visitPacket'");
+	}
+
+	@Override
+	public void visitPacket(ChangeCellPacket packet) {
+		Cell cell = this.doku.getSubGrid(packet.getSudokuIndex()).getCell(packet.getCellIndex());
+		if (cell.getSymbolIndex() == Cell.NOSYMBOL && packet.getNewValue() == Cell.NOSYMBOL)
+			return;
+		if (cell.getSymbolIndex() != Cell.NOSYMBOL && packet.getNewValue() != Cell.NOSYMBOL) {
+			cell.trySetValue(packet.getNewValue());
+			return;
+		}
+		if (cell.getSymbolIndex() != Cell.NOSYMBOL && packet.getNewValue() == Cell.NOSYMBOL) {
+			cell.empty();
+			this.server.getGame().setPlayerRemainingCells(player, player.getRemainingCells() + 1);
+			this.server.broadcastPacket(new UpdatePlayerScorePacket(player.getId(), player.getRemainingCells()));
+			return;
+		}
+		// on rajoute un chiffre à la grille
+		if (cell.trySetValue(packet.getNewValue())) {
+			this.server.getGame().setPlayerRemainingCells(player, player.getRemainingCells() - 1);
+			this.server.broadcastPacket(new UpdatePlayerScorePacket(player.getId(), player.getRemainingCells()));
+		}
+		checkWin();
+	}
+
+	private void checkWin() {
+		if (this.player.getRemainingCells() == 0) {
+			this.server.stopGame();
+		}
+	}
+
+	public void setSudoku(MultiDoku doku) {
+		this.doku = doku;
+		assert (player != null);
+		this.server.getGame().setPlayerRemainingCells(player, this.doku.getEmptyCells().size());
+		this.server.broadcastPacket(new UpdatePlayerScorePacket(player.getId(), player.getRemainingCells()));
+	}
+
 }

app/src/main/java/network/server/ServerLogicThread.java

@@ -19,7 +19,7 @@ public class ServerLogicThread extends Thread {
 			try {
 				Thread.sleep(50);
 			} catch (InterruptedException e) {
-				// e.printStackTrace();
+				e.printStackTrace();
 				break;
 			}
 		}

app/src/main/java/sudoku/Main.java

@@ -3,45 +3,48 @@
  */
 package sudoku;
 
+import gui.RenderableMultidoku;
+import gui.constants.Symbols;
+import sudoku.io.ConsoleInterface;
 import sudoku.io.SudokuPrinter;
+import sudoku.io.SudokuSerializer;
+import sudoku.solver.RandomSolver;
+import sudoku.structure.MultiDoku;
 import sudoku.structure.SudokuFactory;
 
-import java.util.Arrays;
-
 public class Main {
     public String getGreeting() {
         return "Hello World!";
     }
 
+    public static void voidTest(){
+        MultiDoku md = SudokuFactory.createBasicXShapedMultidoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
+        SudokuPrinter.printMultiDoku(RenderableMultidoku.fromMultidoku(md), Symbols.Numbers, 3, 3);
+        SudokuSerializer.saveMultiDoku(md);
+    }
+
+    public static void filledTest(){
+        MultiDoku md = SudokuFactory.createBasicXShapedMultidoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
+        new RandomSolver().solve(md);
+        SudokuPrinter.printMultiDoku(RenderableMultidoku.fromMultidoku(md), Symbols.Numbers, 3, 3);
+        SudokuSerializer.saveMultiDoku(md);
+    }
+
+    public static void overwriteTest(int n){
+        MultiDoku md = SudokuFactory.createBasicXShapedMultidoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
+        new RandomSolver().solve(md);
+        SudokuPrinter.printMultiDoku(RenderableMultidoku.fromMultidoku(md), Symbols.Numbers, 3, 3);
+        SudokuSerializer.saveMultiDoku(md, n);
+    }
+
     public static void main(String[] args) {
-        System.out.println(new Main().getGreeting());
+        ConsoleInterface console = new ConsoleInterface();
-
-        int blockWidth = 2;
-        int blockHeight = 2;
-        var multidoku = SudokuFactory.createBasicEmptyRectangleSudoku(blockWidth, blockHeight);
-        var sudoku = multidoku.getSubGrid(0);
-        if(!sudoku.setCellsSymbol(Arrays.asList(0,1,2,3, 2,3,1,1, 1,0,3,2, 3,2,1,1))){
-            System.out.println("At least one of those values does not respect the constraints.");
-        }
-
-
-        //sudoku.setCellSymbol(8,3,0);
-
-        SudokuPrinter.printRectangleSudoku(multidoku.getSubGrid(0), blockWidth , blockHeight);
-
         /*
-        Solver solver = new Solver();
+        voidTest();
-        ArrayList<IConstraint> constraints = new ArrayList<>();
+        filledTest();
-        constraints.add(new LineConstraint());
+        overwriteTest(0);
-        constraints.add(new ColumnConstraint());
+        overwriteTest(17)
-        constraints.add(new BlockConstraint());
-        try {
-            solver.solve(multidoku, constraints);
-        } catch (Exception e) {
-            System.out.println(e);
-        }
         */
-
+        console.welcome();
-
     }
 }

app/src/main/java/sudoku/constraint/ColumnConstraint.java

@@ -1,5 +1,6 @@
 package sudoku.constraint;
 
+import sudoku.structure.Cell;
 import sudoku.structure.Sudoku;
 
 public class ColumnConstraint implements IConstraint {
@@ -7,10 +8,12 @@ public class ColumnConstraint implements IConstraint {
 	@Override
 	public boolean canBePlaced(final Sudoku s, int x, int y, int newSymbolIndex) {
 		for (int i = 0; i < s.getSize(); i++) {
-			if (s.getCell(x, i).getSymbolIndex() == newSymbolIndex)
+			Cell cell = s.getCell(x, i);
+			int symbol = cell.getSymbolIndex();
+			if (symbol == newSymbolIndex) {
 				return false;
+			}
 		}
 		return true;
 	}
-
 }

app/src/main/java/sudoku/constraint/Constraint.java

@@ -0,0 +1,52 @@
+package sudoku.constraint;
+
+import java.util.List;
+
+import sudoku.structure.Sudoku;
+
+public enum Constraint {
+
+	Block("Bloc", new BlockConstraint()),
+	Column("Colonne", new ColumnConstraint()),
+	Line("Ligne", new LineConstraint()),
+	Diagonal("Diagonale", new DiagonalConstraint());
+
+	String displayName;
+	IConstraint constraint;
+
+	private Constraint(String displayName, IConstraint contraint) {
+		this.constraint = contraint;
+		this.displayName = displayName;
+	}
+
+	public boolean canBePlaced(Sudoku s, int x, int y, int newValue) {
+		return getConstraint().canBePlaced(s, x, y, newValue);
+	}
+
+	public List<Integer> getPossibleSymbols(final Sudoku s, int x, int y) {
+		return getConstraint().getPossibleSymbols(s, x, y);
+	}
+
+	public String getDisplayName() {
+		return displayName;
+	}
+
+	public IConstraint getConstraint() {
+		return constraint;
+	}
+
+	private static final String[] constraintNames;
+
+	static {
+		Constraint[] cons = Constraint.values();
+		constraintNames = new String[cons.length];
+		for (int i = 0; i < cons.length; i++) {
+			constraintNames[i] = cons[i].getDisplayName();
+		}
+	}
+
+	public static String[] getConstraintNames() {
+		return constraintNames;
+	}
+
+}

app/src/main/java/sudoku/constraint/DiagonalConstraint.java

@@ -0,0 +1,24 @@
+package sudoku.constraint;
+
+import sudoku.structure.Sudoku;
+
+public class DiagonalConstraint implements IConstraint {
+
+	@Override
+	public boolean canBePlaced(Sudoku s, int x, int y, int newSymbolIndex) {
+		if (x == y) {
+			for (int i = 0; i < s.getSize(); i++) {
+				if (s.getCell(i, i).getSymbolIndex() == newSymbolIndex)
+					return false;
+			}
+		} else if (s.getSize() - x == y) {
+			for (int i = 0; i < s.getSize(); i++) {
+				if (s.getCell(s.getSize() - i - 1, i).getSymbolIndex() == newSymbolIndex)
+					return false;
+			}
+		}
+		// not in diagonal
+		return true;
+	}
+
+}

app/src/main/java/sudoku/constraint/IConstraint.java

@@ -1,12 +1,12 @@
 package sudoku.constraint;
 
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.List;
 
 import sudoku.structure.Sudoku;
 
-public interface IConstraint {
+public interface IConstraint extends Serializable {
-
 	boolean canBePlaced(final Sudoku s, int x, int y, int newSymbolIndex);
 
 	default List<Integer> getPossibleSymbols(final Sudoku s, int x, int y) {

app/src/main/java/sudoku/io/ConsoleInterface.java

@@ -0,0 +1,305 @@
+package sudoku.io;
+
+import gui.RenderableMultidoku;
+import gui.constants.Symbols;
+import sudoku.constraint.*;
+import sudoku.solver.*;
+import sudoku.structure.*;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Scanner;
+
+public class ConsoleInterface {
+    public Scanner reader = new Scanner(System.in);
+
+    public void welcome() {
+        System.out.println("Welcome to our Sudoku Solver!");
+        System.out.println("This is the project of Melvyn Bauvent, Lilas Grenier and Simon Pribylski.");
+        System.out.println("Do you have a save sudoku you would like to continue? (y/n, default n)");
+        if (reader.next().equalsIgnoreCase("y")) {
+            useSavedDoku();
+        } else {
+            createDoku();
+        }
+    }
+
+    private void useSavedDoku() {
+        System.out.println("What save should we use? Please enter the save number.");
+        MultiDoku md = saveChoice();
+        int blockWidth = md.getSubGrid(0).getBlockWidth();
+        int blockHeight = md.getSubGrid(0).getBlocks().getFirst().getCells().size() / blockWidth;
+        List<String> listSymbols = pickSymbols(blockWidth * blockHeight);
+        System.out.println("This is the saved sudoku:");
+        showMultidoku(md, listSymbols, blockWidth, blockHeight);
+        do {
+            turn(md, listSymbols, blockWidth, blockHeight);
+        } while (!md.isSolved());
+        congrats();
+    }
+
+    public void createDoku() {
+        System.out.println("First of all, you need to tell me the size of the sudoku you want to generate.");
+        int width = getBlockWidth();
+        int height = getBlockHeight();
+        System.out.println("Your sudoku will have blocks of a " + width + " x " + height + " format.");
+        int numberOfSymbols = width * height;
+        List<String> listSymbols = pickSymbols(numberOfSymbols);
+        List<IConstraint> listConstraints = getListConstraints();
+        System.out.println("Now that we have the size of our sudoku, " +
+                "would you rather have a single grid ('one', default), " +
+                "or a a multidoku composed of 5 subgrids ('multi') ?");
+        MultiDoku doku;
+        if (reader.next().equalsIgnoreCase("multi")) {
+            doku = SudokuFactory.createBasicXShapedMultidoku(width, height, listConstraints);
+        } else {
+            doku = SudokuFactory.createBasicEmptyRectangleDoku(width, height, listConstraints);
+        }
+        System.out.println("Your sudoku will look like this:");
+        showMultidoku(doku, listSymbols, width, height);
+        System.out.println(
+                "You can now manually fill this sudoku ('fill'), or generate a playable one ('generate', default):");
+        if (reader.next().equalsIgnoreCase("fill")) {
+            findSolution(doku, listSymbols, width, height);
+        } else {
+            playableDoku(doku, listSymbols, width, height);
+        }
+    }
+
+    private void playableDoku(MultiDoku doku, List<String> listSymbols, int width, int height) {
+        System.out.println("We will now fill this sudoku.");
+        System.out.println("What level of difficulty would you like?" +
+                " ('very easy', 'easy', 'medium' (default), 'hard', 'full' (sudoku fully completed))");
+        String difficulty = reader.next().toLowerCase();
+        if (difficulty.equals("full")) {
+            generateFullDoku(doku);
+            System.out.println("Here's your sudoku !");
+            exit();
+        } else {
+            generatePartialDoku(doku, difficulty);
+            System.out.println("Here's your sudoku !");
+            showMultidoku(doku, listSymbols, width, height);
+            do {
+                turn(doku, listSymbols, width, height);
+            } while (!doku.isSolved());
+            congrats();
+        }
+    }
+
+    private void findSolution(MultiDoku doku, List<String> listSymbols, int width, int height){
+        do {
+            turn(doku, listSymbols, width, height);
+        } while (!doku.isSolved());
+        System.out.println("This doku can be solved like this :");
+        showMultidoku(doku, listSymbols, width, height);
+        exit();
+
+    }
+
+    private void congrats() {
+        System.out.println("Congrats! You've solved this sudoku! We hope this was fun! Let's play together again!");
+        System.exit(0);
+    }
+
+    private MultiDoku saveChoice() {
+        int nbSave;
+        MultiDoku md = null;
+        do {
+            nbSave = reader.nextInt();
+            try {
+                md = SudokuSerializer.getSavedMultiDoku(nbSave);
+            } catch (Exception e) {
+                System.out.println("There seems to be a problem with this save, please try again.");
+            }
+        } while (md == null);
+        return md;
+    }
+
+    public int getBlockWidth() {
+        System.out.println("Width of a block: ");
+        int widthBlock = reader.nextInt();
+        checkValidSize(widthBlock);
+        while (!checkValidSize(widthBlock)) {
+            System.out.println("That is not a valid width for a block. Try again:");
+            widthBlock = reader.nextInt();
+        }
+        System.out.println("You have chose a width of " + widthBlock + ".");
+        return widthBlock;
+    }
+
+    public int getBlockHeight() {
+        System.out.println("Height of a block: ");
+        int heightBlock = reader.nextInt();
+        checkValidSize(heightBlock);
+        while (!checkValidSize(heightBlock)) {
+            System.out.println("That is not a valid height for a block. Try again:");
+            heightBlock = reader.nextInt();
+        }
+        System.out.println("You have chose a height of " + heightBlock + ".");
+        return heightBlock;
+    }
+
+    private Boolean checkValidSize(int size) {
+        return (size > 0);
+    }
+
+    private List<String> pickSymbols(int numberOfSymbols) {
+        System.out.println("Would you like to pick the " + numberOfSymbols
+                + " symbols from the sudoku? (y/n, default 'no')");
+        if (reader.next().equalsIgnoreCase("y")) {
+            List<String> listSymbols = new ArrayList<>();
+            System.out.println("You have chosen to pick your own symbols.");
+            for (int i = 0; i < numberOfSymbols; i++) {
+                System.out.println("Choose for the symbol number " + i + ": ");
+                String newSymbol = reader.next();
+                while (listSymbols.contains(newSymbol)) {
+                    System.out.println("This symbol has already been given. Try again:");
+                    newSymbol = reader.next();
+                }
+                listSymbols.add(newSymbol);
+            }
+            System.out.println("You chose the symbols: " + listSymbols.toString());
+            return listSymbols;
+        } else {
+            System.out.println(
+                    "What existing sets of symbols do you want to use? Numbers ('n', default), letters ('l'), or emojis ('e', may not work on all consoles)?");
+            return switch (reader.next().toLowerCase()) {
+                case "l" -> Symbols.Letters.getSymbols();
+                case "e" -> Symbols.Emojis.getSymbols();
+                default -> Symbols.Numbers.getSymbols();
+            };
+        }
+    }
+
+    private List<IConstraint> getListConstraints() {
+        List<IConstraint> listConstraints = SudokuFactory.DEFAULT_CONSTRAINTS;
+        System.out.println(
+                "The sudoku have constraints of blocks, lines and columns. Would you like to add the diagonal constraints ? (y/n, default 'no')");
+        if (reader.next().equalsIgnoreCase("y")) {
+            listConstraints.add(Constraint.Diagonal.getConstraint());
+        }
+        return listConstraints;
+    }
+
+    private void generatePartialDoku(MultiDoku doku, String difficultyName) {
+        Difficulty difficulty;
+        switch (difficultyName) {
+            case "very easy":
+                difficulty = Difficulty.VeryEasy;
+            case "easy":
+                difficulty = Difficulty.Easy;
+            case "hard":
+                difficulty = Difficulty.Hard;
+            default:
+                difficulty = Difficulty.Medium;
+        }
+        try {
+            SudokuFactory.fillDoku(doku, difficulty);
+        } catch (Exception e) {
+            System.out.println("There seems to be a problem with those settings. Let's start again.");
+        }
+    }
+
+    private void generateFullDoku(MultiDoku doku) {
+        new RandomSolver().solve(doku);
+    }
+
+    private void showMultidoku(MultiDoku doku, List<String> listSymbols, int width, int height) {
+        showMultiDoku(RenderableMultidoku.fromMultidoku(doku), listSymbols, width, height);
+    }
+
+    private void showMultiDoku(RenderableMultidoku doku, List<String> listSymbols, int width, int height) {
+        SudokuPrinter.printMultiDokuWithIndex(doku, listSymbols, width, height);
+    }
+
+    private void saveMultiDoku(MultiDoku doku) {
+        System.out.println("Number of the file to overwrite ('-1' or unused save file number to create a new save) :");
+        int n = reader.nextInt();
+        String path = SudokuSerializer.saveMultiDoku(doku, n);
+        System.out.println("The path to your save is:" + path);
+    }
+
+    private void turn(MultiDoku doku, List<String> listSymbols, int width, int height) {
+        System.out.println(
+                "You can now put a number in a cell ('play', default), save the state of the doku ('save'), show a solution ('solution') or exit the program ('exit').");
+        switch (reader.next()) {
+            case "save":
+                saveMultiDoku(doku);
+                break;
+            case "solution":
+                solve(doku);
+                break;
+            case "exit":
+                exit();
+                break;
+            default:
+                play(doku, listSymbols, width, height);
+                break;
+        }
+    }
+
+    private void solve(MultiDoku doku){
+        System.out.println("Pick a solver to use : random ('random', default), human ('human') or mixed solver ('mixed').");
+        switch (reader.next()) {
+            case "human":
+                new HumanSolver().solve(doku);
+                break;
+            case "mixed":
+                new MixedSolver().solve(doku);
+                break;
+            default:
+                new RandomSolver().solve(doku);
+                break;
+        }
+    }
+
+    private void play(MultiDoku doku, List<String> listSymbols, int width, int height) {
+        int x, y;
+        RenderableMultidoku rdoku = RenderableMultidoku.fromMultidoku(doku);
+        do {
+            System.out.println("Line of the cell to fill:");
+            y = reader.nextInt();
+            System.out.println("Column of the cell to fill:");
+            x = reader.nextInt();
+        } while (!isValidCoordinates(rdoku, width, height, x-1, y-1));
+        Cell cell = rdoku.getCell(x-1, y-1);
+        System.out.println("Character to put in the (" + x + ", " + y + ") cell:");
+        String character = reader.next();
+        while (!isValidSymbol(character, listSymbols, width * height)) {
+            System.out.println("This is not a valid symbol; try again:");
+            character = reader.next();
+        }
+        cell.setSymbolIndex(indexOfSymbol(character, listSymbols, width * height));
+        showMultiDoku(rdoku, listSymbols, width, height);
+    }
+
+    private boolean isValidCoordinates(RenderableMultidoku doku, int width, int height, int x, int y) {
+        if (doku.getCell(x, y) != null) {
+            return true;
+        }
+        return false;
+    }
+
+    private int indexOfSymbol(String symbol, List<String> listSymbols, int nbSymbols) {
+        for (int i = 0; i < nbSymbols; i++) {
+            if (listSymbols.get(i).equals(symbol)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    private boolean isValidSymbol(String symbol, List<String> listSymbols, int size) {
+        for (int i = 0; i < size; i++) {
+            if (listSymbols.get(i).equals(symbol)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    private void exit() {
+        System.out.println("Thank you for playing!");
+        System.exit(0);
+    }
+}

app/src/main/java/sudoku/io/SudokuPrinter.java

@@ -1,17 +1,39 @@
 package sudoku.io;
 
+import gui.RenderableMultidoku;
+import gui.constants.Symbols;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
 import sudoku.structure.Sudoku;
 
-public class SudokuPrinter {
+import java.util.List;
 
-	public static void printRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight) {
+public class SudokuPrinter {
+	public static final String ANSI_RESET = "\u001B[0m";
+	public static final String ANSI_RED = "\u001B[31m";
+	public static final String ANSI_GREEN = "\u001B[32m";
+	public static final String ANSI_YELLOW = "\u001B[33m";
+	public static final String ANSI_BLUE = "\u001B[34m";
+	public static final String ANSI_PURPLE = "\u001B[35m";
+	public static final String ANSI_CYAN = "\u001B[36m";
+
+	public static void printRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight, Symbols symbols) {
+		printRectangleSudoku(s, blockWidth, blockHeight, symbols.getSymbols());
+	}
+
+	public static void printRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight, List<String> listSymbols) {
 		for (int y = 0; y < s.getSize(); y++) {
 			if (y % blockHeight == 0 && y > 0) {
 				System.out.println();
 			}
 			StringBuilder line = new StringBuilder("[ ");
 			for (int x = 0; x < s.getSize(); x++) {
-				line.append((s.getCell(x, y).getSymbolIndex() + 1)).append(" ");
+				Cell c = s.getCell(x, y);
+				if (c.getSymbolIndex() == Cell.NOSYMBOL) {
+					line.append("  ");
+				} else {
+					line.append(listSymbols.get(c.getSymbolIndex())).append(" ");
+				}
 				if (x % blockWidth == blockWidth - 1 && x != blockWidth * blockHeight - 1) {
 					line.append("| ");
 				}
@@ -21,7 +43,118 @@ public class SudokuPrinter {
 		}
 	}
 
-	public static String toStringRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight) {
+	public static void printRectangleSudokuWithIndex(final Sudoku s, int blockWidth, int blockHeight,
+			List<String> listSymbols) {
+		StringBuilder header = new StringBuilder("");
+		header.append("    ");
+		for (int x = 0; x < blockWidth*blockHeight; x++) {
+			header.append(x + 1).append(" ");
+			if (x % blockWidth == blockWidth - 1 && x != blockWidth * blockHeight - 1) {
+				header.append("  ");
+			}
+		}
+		header.append("\n");
+		System.out.println(header);
+		for (int y = 0; y < s.getSize(); y++) {
+			if (y % blockHeight == 0 && y > 0) {
+				System.out.println();
+			}
+			StringBuilder line = new StringBuilder(y + 1);
+			line.append(" [ ");
+			for (int x = 0; x < s.getSize(); x++) {
+				Cell c = s.getCell(x, y);
+				if (c.getSymbolIndex() == Cell.NOSYMBOL) {
+					line.append("  ");
+				} else {
+					line.append(listSymbols.get(c.getSymbolIndex())).append(" ");
+				}
+				if (x % blockWidth == blockWidth - 1 && x != blockWidth * blockHeight - 1) {
+					line.append("| ");
+				}
+			}
+			line.append("]");
+			System.out.println(line);
+		}
+	}
+
+	public static void printMultiDoku(final RenderableMultidoku rm, Symbols symbols, int blockWidth, int blockHeight) {
+		printMultiDoku(rm, symbols.getSymbols(), blockWidth, blockHeight);
+	}
+
+	public static void printMultiDoku(final RenderableMultidoku rm, List<String> listSymbols, int blockWidth,
+			int blockHeight) {
+		StringBuilder line = new StringBuilder("\n");
+		int nBlockInWidth = rm.getWidth() / blockWidth;
+		for (int y = 0; y < rm.getHeight(); y++) {
+			if (y % blockHeight == 0) {
+				line.append("__".repeat(Math.max(0, rm.getWidth() + nBlockInWidth))).append("_\n");
+			}
+			line.append("[ ");
+			for (int x = 0; x < rm.getWidth(); x++) {
+				if (x % blockWidth == 0 && x > 0) {
+					line.append("| ");
+				}
+				Cell cell = rm.getCell(x, y);
+				if (cell != null) {
+					if (cell.getSymbolIndex() == Cell.NOSYMBOL) {
+						line.append("- ");
+					} else {
+						line.append(listSymbols.get(cell.getSymbolIndex())).append(" ");
+					}
+				} else {
+					line.append("  ");
+				}
+			}
+			line.append("]\n");
+		}
+		line.append("__".repeat(Math.max(0, rm.getWidth() + nBlockInWidth))).append("_\n");
+		System.out.println(line);
+	}
+
+	public static void printMultiDokuWithIndex(final RenderableMultidoku rm, List<String> listSymbols, int blockWidth,
+			int blockHeight) {
+		StringBuilder line = new StringBuilder("\n");
+		line.append("    ");
+		for (int x = 0; x < rm.getWidth(); x++) {
+			line.append(x + 1).append(" ");
+			if (x % blockWidth == blockWidth - 1 && x != blockWidth * blockHeight - 1) {
+				line.append("  ");
+			}
+		}
+		line.append("\n");
+		int nBlockInWidth = rm.getWidth() / blockWidth;
+		for (int y = 0; y < rm.getHeight(); y++) {
+			if (y % blockHeight == 0) {
+				line.append("  ").append("__".repeat(Math.max(0, rm.getWidth() + nBlockInWidth))).append("_\n");
+			}
+			line.append(y+1).append(" [ ");
+			for (int x = 0; x < rm.getWidth(); x++) {
+				if (x % blockWidth == 0 && x > 0) {
+					line.append("| ");
+				}
+				Cell cell = rm.getCell(x, y);
+				if (cell != null) {
+					if (cell.getSymbolIndex() == Cell.NOSYMBOL) {
+						line.append("- ");
+					} else {
+						line.append(listSymbols.get(cell.getSymbolIndex())).append(" ");
+					}
+				} else {
+					line.append("  ");
+				}
+			}
+			line.append("]\n");
+		}
+		line.append("  ").append("__".repeat(Math.max(0, rm.getWidth() + nBlockInWidth))).append("_\n");
+		System.out.println(line);
+	}
+
+	public static String toStringRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight, Symbols symbols) {
+		return toStringRectangleSudoku(s, blockWidth, blockHeight, symbols.getSymbols());
+	}
+
+	public static String toStringRectangleSudoku(final Sudoku s, int blockWidth, int blockHeight,
+			List<String> listSymbols) {
 		StringBuilder result = new StringBuilder();
 		for (int y = 0; y < s.getSize(); y++) {
 			// Ajouter une ligne vide entre les blocs horizontaux
@@ -31,7 +164,12 @@ public class SudokuPrinter {
 			StringBuilder line = new StringBuilder("[ ");
 			for (int x = 0; x < s.getSize(); x++) {
 				// Ajouter la valeur de la cellule
-				line.append((s.getCell(x, y).getSymbolIndex() + 1)).append(" ");
+				Cell cell = s.getCell(x, y);
+				if (cell.getSymbolIndex() == Cell.NOSYMBOL) {
+					line.append("  ");
+				} else {
+					line.append(listSymbols.get(cell.getSymbolIndex())).append(" ");
+				}
 
 				// Ajouter un séparateur vertical entre les blocs
 				if (x % blockWidth == blockWidth - 1 && x != s.getSize() - 1) {
@@ -43,4 +181,22 @@ public class SudokuPrinter {
 		}
 		return result.toString();
 	}
+
+	public static void printMultiDoku(final MultiDoku doku, int blockWidth, int blockHeight, Symbols symbols) {
+		if (doku.getNbSubGrids() == 1) {
+			printRectangleSudoku(doku.getSubGrid(0), blockWidth, blockHeight, symbols);
+		} else {
+			printMultiDoku(RenderableMultidoku.fromMultidoku(doku), symbols, blockWidth, blockHeight);
+		}
+	}
+
+	public static void printMultiDokuWithIndex(final MultiDoku doku, int blockWidth, int blockHeight, Symbols symbols) {
+		if (doku.getNbSubGrids() == 1) {
+			printRectangleSudokuWithIndex(doku.getSubGrid(0), blockWidth, blockHeight, symbols.getSymbols());
+		} else {
+			printMultiDokuWithIndex(RenderableMultidoku.fromMultidoku(doku), symbols.getSymbols(), blockWidth,
+					blockHeight);
+		}
+	}
+
 }

app/src/main/java/sudoku/io/SudokuSerializer.java

@@ -1,26 +1,31 @@
 package sudoku.io;
 
-import java.io.*;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.List;
 
 import org.json.JSONArray;
 import org.json.JSONObject;
 
+import sudoku.constraint.Constraint;
+import sudoku.constraint.IConstraint;
 import sudoku.structure.Block;
 import sudoku.structure.Cell;
 import sudoku.structure.MultiDoku;
 import sudoku.structure.Sudoku;
-import sudoku.structure.SudokuFactory;
 
 public class SudokuSerializer {
 
 	public static JSONObject serializeSudoku(final MultiDoku multidoku) {
-		List<Cell> cellIds   = new ArrayList<>();
+		List<Cell> cellIds = new ArrayList<>();
 		List<Block> blockIds = new ArrayList<>();
 
-		JSONObject jsonRoot  = new JSONObject();
+		JSONObject jsonRoot = new JSONObject();
-		JSONArray jsonCells  = new JSONArray();
+		JSONArray jsonCells = new JSONArray();
 		JSONArray jsonBlocks = new JSONArray();
 		JSONArray jsonSudokus = new JSONArray(multidoku.getNbSubGrids());
 
@@ -29,10 +34,10 @@ public class SudokuSerializer {
 
 			// init cells
 			for (Cell cell : sudoku.getCells()) {
-				if (!cellIds.contains(cell)) {
+				if (cellIds.contains(cell))
-					cellIds.add(cell);
+					continue;
 
-				}
+				cellIds.add(cell);
 
 				Block block = cell.getBlock();
 				if (!blockIds.contains(block)) {
@@ -40,6 +45,7 @@ public class SudokuSerializer {
 				}
 
 				int blockID = blockIds.indexOf(block);
+				assert (blockID >= 0);
 				int symbolIndex = cell.getSymbolIndex();
 
 				JSONObject cellJsonObject = new JSONObject();
@@ -55,22 +61,24 @@ public class SudokuSerializer {
 
 		// init blocks
 
-        for (Block blockId : blockIds) {
+		for (Block blockId : blockIds) {
-            JSONObject blockJsonObject = new JSONObject();
+			JSONObject blockJsonObject = new JSONObject();
-            JSONArray cellsJsonArray = new JSONArray();
+			JSONArray cellsJsonArray = new JSONArray();
-            for (Cell cell : blockId.getCells()) {
+			for (Cell cell : blockId.getCells()) {
-                int cellID = cellIds.indexOf(cell);
+				int cellID = cellIds.indexOf(cell);
-                cellsJsonArray.put(cellID);
+				assert (cellID >= 0);
-            }
+				cellsJsonArray.put(cellID);
-            blockJsonObject.put("cellIDs", cellsJsonArray);
+			}
-            jsonBlocks.put(blockJsonObject);
+			blockJsonObject.put("cellIDs", cellsJsonArray);
-        }
+			jsonBlocks.put(blockJsonObject);
+		}
 
 		for (int i = 0; i < multidoku.getNbSubGrids(); i++) {
 			// serialise sub grid
 			JSONObject jsonSudoku = new JSONObject();
 			JSONArray cellsJsonArray = new JSONArray();
 			JSONArray blocksJsonArray = new JSONArray();
+			JSONArray constraintsJsonArray = new JSONArray();
 
 			Sudoku sudoku = multidoku.getSubGrid(i);
 
@@ -78,6 +86,7 @@ public class SudokuSerializer {
 
 			for (Cell cell : sudoku.getCells()) {
 				int cellID = cellIds.indexOf(cell);
+				assert (cellID >= 0);
 				cellsJsonArray.put(cellID);
 			}
 
@@ -85,9 +94,26 @@ public class SudokuSerializer {
 
 			for (Block block : sudoku.getBlocks()) {
 				int blockID = blockIds.indexOf(block);
+				assert (blockID >= 0);
 				blocksJsonArray.put(blockID);
 			}
 
+			// serialize constraints
+
+			for (IConstraint cons : sudoku.getConstraints()) {
+				boolean constraintSerialized = false;
+				for (Constraint enumCons : Constraint.values()) {
+					if (cons.getClass().isAssignableFrom(enumCons.getConstraint().getClass())) {
+						constraintSerialized = true;
+						constraintsJsonArray.put(enumCons.ordinal());
+					}
+				}
+				if (!constraintSerialized) {
+					System.out.println("La contrainte " + cons.getClass() + " n'a pas pu être sérialisé !");
+				}
+			}
+
+			jsonSudoku.put("constraints", constraintsJsonArray);
 			jsonSudoku.put("cells", cellsJsonArray);
 			jsonSudoku.put("blocks", blocksJsonArray);
 			jsonSudoku.put("blockWidth", sudoku.getBlockWidth());
@@ -101,25 +127,71 @@ public class SudokuSerializer {
 		return jsonRoot;
 	}
 
-	public static void saveMultiDoku(final MultiDoku doku) {
+	/**
-
+	 * Save a serialized MultiDoku in a JSON file.
+	 * 
+	 * @param doku MultiDoku, MultiDoku to save.
+	 * @return String, the path of the save.
+	 */
+	public static String saveMultiDoku(final MultiDoku doku) {
 		JSONObject jsonRoot = serializeSudoku(doku);
 
 		File f = new File("save", "save.json");
-		InputStream is = null;
+		int i = 0;
-		int i = 1;
-
 		while (f.exists()) {
-			String newName = "save-" + i + ".json";
+			String newName = "save-" + ++i + ".json";
 			f = new File("save", newName);
-			i++;
 		}
-
 		try (FileWriter file = new FileWriter(f)) {
 			file.write(jsonRoot.toString(3));
-			//file.flush();
 		} catch (IOException e) {
-			e.fillInStackTrace();
+			e.printStackTrace();
+		}
+		return f.getAbsolutePath();
+	}
+
+	public static String saveMultiDoku(final MultiDoku doku, final int saveToOverwrite) {
+		File f;
+		if (saveToOverwrite == 0) {
+			f = new File("save", "save.json");
+		} else {
+			f = new File("save", "save-" + saveToOverwrite + ".json");
+		}
+		if (!f.exists()) {
+			return saveMultiDoku(doku);
+		} else {
+			try (FileWriter file = new FileWriter(f)) {
+				file.write(serializeSudoku(doku).toString(3));
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+			return f.getAbsolutePath();
+		}
+	}
+
+	/**
+	 * Get a MultiDoku from a pre-existing json save file.
+	 * 
+	 * @param numberSave int, number of the save file to open.
+	 * @return MultiDoku, MultoDoku contained in the file.
+	 * @throws Exception when the given save file does not exist.
+	 */
+	public static MultiDoku getSavedMultiDoku(int numberSave) throws Exception {
+		String fileName;
+		if (numberSave < 1) {
+			fileName = "save.json";
+		} else {
+			fileName = "save-" + numberSave + ".json";
+		}
+
+		File f = new File("save", fileName);
+		String fileContent;
+
+		if (!f.exists()) {
+			throw new Exception("This save does not exist.");
+		} else {
+			fileContent = new String(Files.readAllBytes(Paths.get("save/" + fileName)));
+			return deserializeSudoku(fileContent);
 		}
 	}
 
@@ -167,9 +239,11 @@ public class SudokuSerializer {
 			JSONObject sudokuJsonObject = multidokuJsonObject.getJSONObject(i);
 			JSONArray sudokuCellsJsonArray = sudokuJsonObject.getJSONArray("cells");
 			JSONArray sudokuBlocksJsonArray = sudokuJsonObject.getJSONArray("blocks");
+			JSONArray sudokuConstraintsJsonArray = sudokuJsonObject.getJSONArray("constraints");
 
 			List<Cell> sudokuCells = new ArrayList<>();
 			List<Block> sudokuBlocks = new ArrayList<>();
+			List<IConstraint> sudokuConstraints = new ArrayList<>();
 
 			for (int j = 0; j < sudokuCellsJsonArray.length(); j++) {
 				int cellID = sudokuCellsJsonArray.getInt(j);
@@ -181,8 +255,16 @@ public class SudokuSerializer {
 				sudokuBlocks.add(blocks.get(blockID));
 			}
 
-			Sudoku s = new Sudoku(sudokuCells, sudokuBlocks, SudokuFactory.DEFAULT_CONSTRAINTS);
+			for (int j = 0; j < sudokuConstraintsJsonArray.length(); j++) {
+				int constraintID = sudokuConstraintsJsonArray.getInt(j);
+				sudokuConstraints.add(Constraint.values()[constraintID].getConstraint());
+			}
+
+			Sudoku s = new Sudoku(sudokuCells, sudokuBlocks, sudokuConstraints);
 			s.setBlockWidth(sudokuJsonObject.getInt("blockWidth"));
+			for (Block block : s.getBlocks()) {
+				block.getSudokus().add(s);
+			}
 			sudokus.add(s);
 		}
 

app/src/main/java/sudoku/solver/BacktrackingSolver.java

@@ -0,0 +1,49 @@
+package sudoku.solver;
+
+import java.util.List;
+import java.util.concurrent.CancellationException;
+
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+
+public class BacktrackingSolver implements Solver {
+
+	/**
+	 * Résout le MultiDoku passé en paramètre, avec backtracking.
+	 *
+	 * @param doku MultiDoku, MultiDoku à résoudre.
+	 * @return boolean, valant true si le MultiDoku est résolu, false sinon.
+	 */
+	@Override
+	public boolean solve(MultiDoku doku, List<SolverStep> steps) {
+		if (Thread.interrupted())
+			throw new CancellationException("User wants to stop the solver");
+
+		if (doku.isSolved()) {
+			return true;
+		}
+
+		Cell cellToFill = doku.getFirstEmptyCell();
+		if (cellToFill == null) {
+			return false;
+		}
+
+		List<Integer> possibleSymbols = cellToFill.getPossibleSymbols();
+		if (possibleSymbols.isEmpty()) {
+			return false;
+		}
+
+		for (int symbol : possibleSymbols) {
+			cellToFill.setSymbolIndex(symbol);
+			addStep(cellToFill, steps);
+			if (this.solve(doku, steps)) {
+				return true;
+			} else {
+				cellToFill.setSymbolIndex(Cell.NOSYMBOL);
+				addStep(cellToFill, steps);
+			}
+		}
+		return false;
+	}
+
+}

app/src/main/java/sudoku/solver/HintHelper.java

@@ -0,0 +1,54 @@
+package sudoku.solver;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Random;
+
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+
+public class HintHelper {
+
+	public static record Hint(Cell cell, int newValue) {
+
+	}
+
+	public static Hint getHint(MultiDoku doku, Solver solver) {
+		doku.getStateManager().pushState();
+		doku.clearMutableCells();
+		if (!solver.solve(doku))
+			return null;
+		var stateSolved = doku.getStateManager().popAndGetState();
+		// find differences
+		Map<Cell, Integer> newValues = new HashMap<>();
+		for (var entry : stateSolved.entrySet()) {
+			Cell cell = entry.getKey();
+			// we only want the cells that can be filled
+			if (!cell.isMutable())
+				continue;
+			int oldValue = cell.getSymbolIndex();
+			int newValue = stateSolved.get(cell);
+			if (oldValue == newValue)
+				continue;
+			// we have to clear the cell
+			if (newValue == Cell.NOSYMBOL)
+				return new Hint(cell, newValue);
+			// we have to change the cell value
+			if (oldValue != Cell.NOSYMBOL && newValue != oldValue)
+				return new Hint(cell, newValue);
+
+			// there is a valid move
+			newValues.put(cell, newValue);
+		}
+
+		// this is too complex just for fetching a random entry, but whatever ...
+		Random r = new Random();
+		List<Cell> cells = new ArrayList<>(newValues.keySet());
+		Cell randomCell = cells.get(r.nextInt(cells.size()));
+		int randomCellValue = newValues.get(randomCell);
+		return new Hint(randomCell, randomCellValue);
+	}
+
+}

app/src/main/java/sudoku/solver/HumanSolver.java

@@ -0,0 +1,58 @@
+package sudoku.solver;
+
+import java.util.List;
+import java.util.concurrent.CancellationException;
+import java.util.logging.Level;
+
+import gui.constants.Symbols;
+import sudoku.io.SudokuPrinter;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.Sudoku;
+
+public class HumanSolver implements Solver {
+
+	/**
+	 * Résout le MultiDoku passé en paramètre, avec règles de déduction.
+	 *
+	 * @param doku MultiDoku, MultiDoku à résoudre.
+	 * @return boolean, valant true si le MultiDoku est résolu, false sinon.
+	 */
+	@Override
+	public boolean solve(MultiDoku doku, List<SolverStep> steps) {
+		if (Thread.interrupted())
+			throw new CancellationException("User wants to stop the solver");
+
+		Sudoku sudoku = doku.getSubGrid(0);
+		logger.log(Level.FINE,
+				'\n' + SudokuPrinter.toStringRectangleSudoku(sudoku,
+						sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getBlockWidth(),
+						sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getSize() / sudoku.getBlockWidth(),
+						Symbols.Numbers));
+
+		if (doku.isSolved()) {
+			return true;
+		}
+
+		List<Cell> cellsToFill = doku.getEmptyCells();
+		if (cellsToFill.isEmpty()) {
+			return false;
+		}
+
+		for (Cell cellToFill : cellsToFill) {
+
+			List<Integer> possibleSymbols = cellToFill.getPossibleSymbols();
+			if (possibleSymbols.size() != 1) {
+				continue;
+			}
+
+			cellToFill.setSymbolIndex(possibleSymbols.getFirst());
+			addStep(cellToFill, steps);
+
+			return this.solve(doku, steps);
+		}
+
+		return doku.isSolved();
+	}
+
+}

app/src/main/java/sudoku/solver/MixedSolver.java

@@ -0,0 +1,76 @@
+package sudoku.solver;
+
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.CancellationException;
+import java.util.logging.Level;
+
+import gui.constants.Symbols;
+import sudoku.io.SudokuPrinter;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.Sudoku;
+
+public class MixedSolver implements Solver {
+
+    /**
+     * Résout le MultiDoku passé en paramètre, avec règles de déduction et
+     * backtracking.
+     *
+     * @param doku MultiDoku, MultiDoku à résoudre.
+     * @return boolean, valant true si le MultiDoku est résolu, false sinon.
+     */
+    @Override
+    public boolean solve(MultiDoku doku, List<SolverStep> steps) {
+        Random rand = new Random();
+
+        if (Thread.interrupted()) {
+            throw new CancellationException("User wants to stop the solver");
+        }
+
+        Sudoku sudoku = doku.getSubGrid(0);
+        logger.log(Level.FINE,
+                '\n' + SudokuPrinter.toStringRectangleSudoku(
+                        sudoku,
+                        sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getBlockWidth(),
+                        sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getSize() / sudoku.getBlockWidth(),
+                        Symbols.Numbers));
+
+        if (doku.isSolved()) {
+            return true;
+        }
+
+        Cell cellToFill = doku.getFirstEmptyCell();
+        if (cellToFill == null) {
+            return false;
+        }
+
+        List<Integer> possibleSymbols = cellToFill.getPossibleSymbols();
+
+        if (possibleSymbols.size() == 1) {
+            cellToFill.setSymbolIndex(possibleSymbols.getFirst());
+            addStep(cellToFill, steps);
+            if (this.solve(doku, steps)) {
+                return true;
+            }
+        }
+
+        while (!possibleSymbols.isEmpty()) {
+            int nextPossibleSymbolIndex = rand.nextInt(possibleSymbols.size());
+            int nextSymbol = possibleSymbols.get(nextPossibleSymbolIndex);
+
+            cellToFill.setSymbolIndex(nextSymbol);
+            addStep(cellToFill, steps);
+            if (this.solve(doku, steps)) {
+                return true;
+            }
+            cellToFill.setSymbolIndex(Cell.NOSYMBOL);
+            addStep(cellToFill, steps);
+            possibleSymbols.remove(nextPossibleSymbolIndex);
+
+        }
+
+        return false;
+    }
+
+}

app/src/main/java/sudoku/solver/RandomSolver.java

@@ -0,0 +1,66 @@
+package sudoku.solver;
+
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.CancellationException;
+import java.util.logging.Level;
+
+import gui.constants.Symbols;
+import sudoku.io.SudokuPrinter;
+import sudoku.structure.Cell;
+import sudoku.structure.MultiDoku;
+import sudoku.structure.Sudoku;
+
+public class RandomSolver implements Solver {
+
+    /**
+     * Résout, si possible, le multidoku passé en paramètre
+     * en testant toutes les possibilités, de manière aléatoire, avec un algorithme
+     * de backtracking.
+     *
+     * @param doku Multidoku, à résoudre
+     * @return boolean, true s'il est résolu ou false s'il ne l'est pas.
+     */
+    @Override
+    public boolean solve(MultiDoku doku, List<SolverStep> steps) {
+        Random rand = new Random();
+
+        if (Thread.interrupted())
+            throw new CancellationException("User wants to stop the solver");
+
+        Sudoku sudoku = doku.getSubGrid(0);
+        logger.log(Level.FINE,
+                '\n' + SudokuPrinter.toStringRectangleSudoku(sudoku,
+                        sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getBlockWidth(),
+                        sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getSize() / sudoku.getBlockWidth(),
+                        Symbols.Numbers));
+
+        if (doku.isSolved()) {
+            return true;
+        }
+
+        Cell cellToFill = doku.getFirstEmptyCell();
+        if (cellToFill == null) {
+            return false;
+        }
+
+        List<Integer> possibleSymbols = cellToFill.getPossibleSymbols();
+
+        while (!possibleSymbols.isEmpty()) {
+            int nextPossibleSymbolIndex = rand.nextInt(possibleSymbols.size());
+            int nextSymbol = possibleSymbols.get(nextPossibleSymbolIndex);
+
+            cellToFill.setSymbolIndex(nextSymbol);
+            addStep(cellToFill, steps);
+            if (this.solve(doku, steps)) {
+                return true;
+            }
+            cellToFill.setSymbolIndex(Cell.NOSYMBOL);
+            addStep(cellToFill, steps);
+            possibleSymbols.remove(nextPossibleSymbolIndex);
+
+        }
+        return false;
+    }
+
+}

app/src/main/java/sudoku/solver/Solver.java

@@ -1,118 +1,61 @@
 package sudoku.solver;
 
-import sudoku.io.SudokuPrinter;
-import sudoku.structure.MultiDoku;
-import sudoku.structure.Cell;
-import sudoku.structure.Sudoku;
-
 import java.util.List;
-import java.util.Random;
-import java.util.concurrent.CancellationException;
-import java.util.logging.Level;
 import java.util.logging.Logger;
 
-public class Solver {
+import sudoku.structure.Cell;
-    private static final Logger logger = Logger.getLogger("SolverLogger");
+import sudoku.structure.MultiDoku;
+
+public interface Solver {
 
     /**
-     * Résout le multidoku passé en paramètre si c'est possible.
+     * Log du Solver, qui garde trace des actions réalisées.
-     * En testant toutes les possibilités, de manière aléatoire, avec un algorithme
-     * de backtracking.
-     *
-     * @param doku Multidoku, à résoudre
-     * @param rand Random, pour tester aléatoirement les symboles
-     * @return boolean, true s'il est résolu ou false s'il ne l'est pas.
      */
-    public static boolean solveRandom(MultiDoku doku, Random rand) {
+    public static final Logger logger = Logger.getLogger("SolverLogger");
-        if (Thread.interrupted())
-            throw new CancellationException("User wants to stop the solver");
 
-        Sudoku sudoku = doku.getSubGrid(0);
+    boolean solve(MultiDoku doku, List<SolverStep> solverSteps);
-        logger.log(Level.INFO,
-                '\n' + SudokuPrinter.toStringRectangleSudoku(sudoku,
-                        sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getBlockWidth(),
-                        sudoku.getBlockWidth() == 0 ? sudoku.getSize() : sudoku.getSize() / sudoku.getBlockWidth()));
 
-        if (doku.isValid()) {
+    default boolean solve(MultiDoku doku) {
-            return true;
+        return solve(doku, null);
-        }
-
-        Cell cellToFill = doku.getFirstEmptyCell();
-        if (cellToFill == null) {
-            return false;
-        }
-
-        List<Integer> possibleSymbols = doku.getPossibleSymbolsOfCell(cellToFill);
-
-        while (!possibleSymbols.isEmpty()) {
-            int nextPossibleSymbolIndex = rand.nextInt(possibleSymbols.size());
-            int nextSymbol = possibleSymbols.get(nextPossibleSymbolIndex);
-
-            cellToFill.setSymbolIndex(nextSymbol);
-            if (Solver.solveRandom(doku, rand)) {
-                return true;
-            }
-            cellToFill.setSymbolIndex(Cell.NOSYMBOL);
-            possibleSymbols.remove(nextPossibleSymbolIndex);
-
-        }
-        return false;
     }
 
-    public static int countSolution(MultiDoku doku) {
+    /**
+     * Compte le nombre de solutions possibles au MultiDoku passé en paramètres.
+     *
+     * @param doku MultiDoku, MultiDoku dont on veut le nombre de solutions.
+     * @return int, nombre de solutions possibles.
+     */
+    default int countSolution(MultiDoku doku) {
         int result = 0;
 
-        if (doku.isValid()) {
+        if (doku.isSolved()) {
             return 1;
         }
 
         Cell cellToFill = doku.getFirstEmptyCell();
-        if (cellToFill == null) {
+        assert (cellToFill != null);
-            return 0;
-        }
 
-        List<Integer> possibleSymbols = doku.getPossibleSymbolsOfCell(cellToFill);
+        List<Integer> possibleSymbols = cellToFill.getPossibleSymbols();
 
         for (int symbol : possibleSymbols) {
-
+            doku.getStateManager().pushState();
             cellToFill.setSymbolIndex(symbol);
-            if (Solver.solve(doku)) {
+            if (solve(doku)) {
                 result++;
+                if (result > 1) {
+                    doku.getStateManager().popState();
+                    return result;
+                }
             }
-            cellToFill.setSymbolIndex(Cell.NOSYMBOL);
+            doku.getStateManager().popState();
         }
-
         return result;
     }
 
-    public static boolean solve(MultiDoku doku) {
+    default void addStep(Cell cell, List<SolverStep> steps) {
-        if (Thread.interrupted())
+        if (steps == null)
-            throw new CancellationException("User wants to stop the solver");
+            return;
-
+        steps.add(new SolverStep(cell));
-        if (doku.isValid()) {
-            return true;
-        }
-
-        Cell cellToFill = doku.getFirstEmptyCell();
-        if (cellToFill == null) {
-            return false;
-        }
-
-        List<Integer> possibleSymbols = doku.getPossibleSymbolsOfCell(cellToFill);
-        if (possibleSymbols.isEmpty()) {
-            return false;
-        }
-
-        for (int symbol : possibleSymbols) {
-
-            cellToFill.setSymbolIndex(symbol);
-            if (Solver.solve(doku)) {
-                return true;
-            } else {
-                cellToFill.setSymbolIndex(Cell.NOSYMBOL);
-            }
-
-        }
-        return false;
     }
+
 }

app/src/main/java/sudoku/solver/SolverStep.java

@@ -0,0 +1,23 @@
+package sudoku.solver;
+
+import sudoku.structure.Cell;
+
+public class SolverStep {
+
+	private final Cell cell;
+	private final int newValue;
+
+	public SolverStep(Cell cell) {
+		this.cell = cell;
+		this.newValue = cell.getSymbolIndex();
+	}
+
+	public int getNewValue() {
+		return newValue;
+	}
+
+	public Cell getCell() {
+		return cell;
+	}
+
+}

app/src/main/java/sudoku/solver/StupidSolver.java

@@ -2,7 +2,6 @@ package sudoku.solver;
 
 import java.util.concurrent.CancellationException;
 
-import sudoku.structure.Coordinate;
 import sudoku.structure.MultiDoku;
 import sudoku.structure.Sudoku;
 
@@ -24,9 +23,8 @@ public class StupidSolver {
 		if (!sudoku.getCell(index).isMutable())
 			return solve(sudoku, index + 1);
 
-		Coordinate coords = sudoku.toCoords(index);
 		for (int symbol = 0; symbol < sudoku.getSize(); symbol++) {
-			if (sudoku.tryPlaceCellSymbol(coords.getX(), coords.getY(), symbol)) {
+			if (sudoku.getCell(index).trySetValue(symbol)) {
 				// on tente de placer sur la case suivante
 				if (solve(sudoku, index + 1)) {
 					return true;
@@ -34,12 +32,12 @@ public class StupidSolver {
 			}
 		}
 		// on a tout essayé et rien n'a fonctionné
-		sudoku.clearCell(coords.getX(), coords.getY());
+		sudoku.getCell(index).empty();
 		return false;
 	}
 
 	public static boolean solve(MultiDoku doku) {
-		if (doku.isValid())
+		if (doku.isSolved())
 			return true;
 
 		for (Sudoku sudoku : doku.getSubGrids()) {

app/src/main/java/sudoku/structure/Block.java

@@ -5,7 +5,8 @@ import java.util.List;
 
 /**
  * Class qui représente les block de chaque sudoku,
- * Un block étant un ensemble de cellule avec une contrainte de block qui lui ait associé
+ * Un block étant un ensemble de cellule avec une contrainte de block qui lui
+ * ait associé
  */
 public class Block {
 
@@ -18,14 +19,15 @@ public class Block {
 	 * List de sudoku qui contiennent le block
 	 * Pour un acces plus rapide aux sudokus
 	 */
-	private List<Sudoku> sudokus;
+	private final List<Sudoku> sudokus;
 
 	public Block(List<Cell> cells) {
 		this.cells = cells;
+		this.sudokus = new ArrayList<>();
 	}
 
 	public Block() {
-		this.cells = new ArrayList<>();
+		this(new ArrayList<>());
 	}
 
 	public List<Cell> getCells() {
@@ -34,6 +36,7 @@ public class Block {
 
 	/**
 	 * Ajoute une Cell au Block
+	 * 
 	 * @param newCell Cell, à ajouter
 	 */
 	void addCell(Cell newCell) {
@@ -42,6 +45,7 @@ public class Block {
 
 	/**
 	 * Cherche si le Block contient déjà un symbole donné.
+	 * 
 	 * @param symbolIndex int, un index de symbole
 	 * @return boolean, true s'il contient le symbole et false sinon
 	 */
@@ -65,8 +69,4 @@ public class Block {
 	public List<Sudoku> getSudokus() {
 		return sudokus;
 	}
-
-	void setSudokus(List<Sudoku> sudokus) {
-		this.sudokus = sudokus;
-	}
 }

app/src/main/java/sudoku/structure/Cell.java

@@ -24,28 +24,21 @@ public class Cell {
 	 * Il est initialisé à Cell.NOSYMBOL.
 	 */
 	private int symbolIndex = Cell.NOSYMBOL;
-	/**
-	 * Liste des index de symbole possibles pour cette Cell,
-	 * en fonction des contraintes de sudoku dans lequel elle est.
-	 */
-	private final List<Integer> possibleSymbols;
 	/**
 	 * Si cette Cell peut être modififié ou non.
 	 */
 	private boolean isMutable = true;
 
 	public Cell() {
-		this.possibleSymbols = new ArrayList<>();
+		this(Cell.NOSYMBOL);
 	}
 
 	public Cell(int symbolIndex) {
 		this.symbolIndex = symbolIndex;
-		this.possibleSymbols = new ArrayList<>();
 	}
 
 	public Cell(int symbolIndex, boolean isMutable) {
 		this.symbolIndex = symbolIndex;
-		this.possibleSymbols = new ArrayList<>();
 		this.isMutable = isMutable;
 	}
 
@@ -57,11 +50,6 @@ public class Cell {
 		this.symbolIndex = symbolIndex;
 	}
 
-	public void setPossibleSymbols(List<Integer> possibleSymbols) {
-		this.possibleSymbols.clear();
-		this.possibleSymbols.addAll(possibleSymbols);
-	}
-
 	/**
 	 * Rend la Cell immuable.
 	 */
@@ -95,14 +83,6 @@ public class Cell {
 		return this.symbolIndex == Cell.NOSYMBOL;
 	}
 
-	public void removeSymbolFromPossibilities(int indexSymbol) {
-		possibleSymbols.remove(indexSymbol);
-	}
-
-	public List<Integer> getPossibleSymbols() {
-		return this.possibleSymbols;
-	}
-
 	/**
 	 * Renvoie si la Cell est modifiable
 	 * @return boolean, true si elle est modifiable ou false sinon.
@@ -120,4 +100,37 @@ public class Cell {
 		this.symbolIndex = Cell.NOSYMBOL;
 		return oldSymbol;
     }
+
+	public boolean canHaveValue(int value) {
+		for (Sudoku s :getBlock().getSudokus()) {
+			int cellIndex = s.getCells().indexOf(this);
+			// la cellule existe
+			if (cellIndex != -1) {
+				int cellX = cellIndex % s.getSize();
+				int cellY = cellIndex / s.getSize();
+				if (!s.canBePlaced(cellX, cellY, value)) {
+					return false;
+				}
+			}
+		}
+		return true;
+	}
+
+	public List<Integer> getPossibleSymbols() {
+		List<Integer> result = new ArrayList<>();
+		for (int i = 0; i < getBlock().getSudokus().get(0).getSize(); i++) {
+			if (canHaveValue(i))
+				result.add(i);
+		}
+		return result;
+	}
+
+	public boolean trySetValue(int newValue) {
+		if (!isMutable())
+			return false;
+		if (!canHaveValue(newValue))
+			return false;
+		setSymbolIndex(newValue);
+		return true;
+	}
 }

app/src/main/java/sudoku/structure/Difficulty.java

@@ -0,0 +1,38 @@
+package sudoku.structure;
+
+//TODO: melvyn va passer par là
+public enum Difficulty {
+
+	VeryEasy("Très facile", 0.1), Easy("Facile", 0.25), Medium("Moyen", 0.5), Hard("Difficile", 0.75), VeryHard("Impossible", 0.78);
+
+	final double factor;
+	final String displayName;
+
+	private Difficulty(String displayName, double factor) {
+		this.factor = factor;
+		this.displayName = displayName;
+	}
+
+	public String getDisplayName() {
+		return displayName;
+	}
+
+	public double getFactor() {
+		return factor;
+	}
+
+	private static final String[] difficultyNames;
+
+	static {
+		Difficulty[] diffs = Difficulty.values();
+		difficultyNames = new String[diffs.length];
+		for (int i = 0; i < diffs.length; i++) {
+			difficultyNames[i] = diffs[i].getDisplayName();
+		}
+	}
+
+	public static String[] getDifficultyNames() {
+		return difficultyNames;
+	}
+
+}

app/src/main/java/sudoku/structure/MultiDoku.java

@@ -1,7 +1,10 @@
 package sudoku.structure;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Random;
+import java.util.Set;
 
 import sudoku.io.SudokuSerializer;
 
@@ -17,90 +20,60 @@ public class MultiDoku {
 	 */
 	private final List<Sudoku> subGrids;
 
+	private final StateManager stateManager;
+
 	public MultiDoku(List<Sudoku> subGrids) {
 		this.subGrids = subGrids;
-	}
+		this.stateManager = new StateManager(this);
-
-	public MultiDoku clone() {
-		//TODO: ahhhhhhhhhhhhhhhhhhhhhhh
-		return SudokuSerializer.deserializeSudoku(SudokuSerializer.serializeSudoku(this));
 	}
 
 	/**
 	 * Renvoie le nombre de sudoku contenu dans ce MultiDoku.
+	 * 
 	 * @return int
 	 */
-	public int getNbSubGrids(){
+	public int getNbSubGrids() {
 		return subGrids.size();
 	}
 
 	/**
 	 * Renvoie la ie sudoku contenue dans ce MultiDoku.
+	 * 
 	 * @param i int, indice du sudoku à renvoyer.
 	 * @return Sudoku, ie Sudoku
 	 */
-	public Sudoku getSubGrid(int i){
+	public Sudoku getSubGrid(int i) {
 		return subGrids.get(i);
 	}
 
 	/**
 	 * Renvoie la liste des Cells contenue dans ce MultiDoku,
 	 * soit les Cells contenues de chaques sous-Sudoku.
+	 * 
 	 * @return List<Cell>
 	 */
-	public List<Cell> getCells(){
+	public List<Cell> getCells() {
-		List<Cell> cells = new ArrayList<>();
+		Set<Cell> cellsSet = new HashSet<>();
-		for (Sudoku sudoku : subGrids){
+		for (Sudoku sudoku : subGrids) {
-			cells.addAll(sudoku.getCells());
+			cellsSet.addAll(sudoku.getCells());
-		}
-		return cells;
-	}
-
-	/**
-	 * Met à jour les symboles possibles de chaque Cell.
-	 * @throws Exception, si ce n'est pas possible.
-	 */
-	public void updateSymbolsPossibilities() throws Exception {
-		for (Sudoku sudoku : subGrids){
-			sudoku.updateSymbolsPossibilities();
 		}
+		return new ArrayList<>(cellsSet);
 	}
 
 	@Override
 	public String toString() {
 		StringBuilder sb = new StringBuilder();
 		sb.append("Multidoku {");
-		for (Sudoku sudoku : subGrids){
+		for (Sudoku sudoku : subGrids) {
 			sb.append("\n\t").append(sudoku.toString());
 		}
 		sb.append("\n}");
 		return sb.toString();
 	}
 
-	/**
-	 * Renvoie les symboles possibles d'une Cell donnée.
-	 * @param cellToFill Cell.
-	 * @return List<Integer>, liste des symboles possible.
-	 */
-	public List<Integer> getPossibleSymbolsOfCell(Cell cellToFill) {
-		List<Integer> result = new ArrayList<>();
-		boolean hasBeenFill = false;
-
-        for (Sudoku sudoku : this.subGrids) {
-            if (sudoku.contains(cellToFill)) {
-                if (!hasBeenFill) {
-                    result.addAll(sudoku.getPossibleSymbolsOfCell(cellToFill));
-                    hasBeenFill = true;
-                } else {
-                    result.retainAll(sudoku.getPossibleSymbolsOfCell(cellToFill));
-                }
-            }
-        }
-		return result;
-	}
-
 	/**
 	 * Renvoie les sous-Sudoku
+	 * 
 	 * @return List<Sudoku>
 	 */
 	public List<Sudoku> getSubGrids() {
@@ -108,44 +81,27 @@ public class MultiDoku {
 	}
 
 	/**
-	 * Check si le MultiDoku est valide, en fonction de ses sous-Sudokus.
+	 * Check si le MultiDoku est résolu, c'est à dire complet et cohérent avec ses contraintes. 
-	 * @return boolean, true s'il est valide et false sinon.
+	 * 
+	 * @return boolean, true s'il est résolu et false sinon.
 	 */
-	public boolean isValid() {
+	public boolean isSolved() {
-		boolean result = true;
 		for (Sudoku sudoku : this.subGrids) {
-			result = sudoku.isValid() && result;
+			if (!sudoku.isSolved())
-		}
-		return result;
-	}
-
-	@Override
-	public boolean equals(Object object) {
-		if (!(object instanceof MultiDoku)) {
-			return false;
-		}
-
-		if (this.getNbSubGrids() != ((MultiDoku) object).getNbSubGrids()) {
-			return false;
-		}
-
-		for (int i = 0; i < this.getNbSubGrids(); i++) {
-			if (!this.getSubGrid(i).equals(((MultiDoku) object).getSubGrid(i))) {
 				return false;
-			}
 		}
-
 		return true;
 	}
 
 	/**
 	 * Renvoie la 1re Cell vide des sous-Sudoku.
+	 * 
 	 * @return Cell, une Cell vide, ou null s'il n'y en a pas.
 	 */
 	public Cell getFirstEmptyCell() {
 		for (Sudoku sudoku : this.subGrids) {
 			Cell cellTmp = sudoku.getFirstEmptyCell();
-			if (cellTmp != null && cellTmp.isEmpty()) {
+			if (cellTmp != null) {
 				return cellTmp;
 			}
 		}
@@ -154,11 +110,12 @@ public class MultiDoku {
 
 	/**
 	 * Renvoie la liste des Cells préalablement remplies du MultiDoku.
+	 * 
 	 * @return List<Cell>, vide si aucune Cell n'est remplie.
 	 */
 	public List<Cell> getFilledCells() {
 		List<Cell> result = new ArrayList<>();
-		for (Cell cell : this.getCells()){
+		for (Cell cell : this.getCells()) {
 			if (!cell.isEmpty()) {
 				result.add(cell);
 			}
@@ -166,8 +123,24 @@ public class MultiDoku {
 		return result;
 	}
 
+	/**
+	 * Renvoie la liste des Cells vides du MultiDoku.
+	 * 
+	 * @return List<Cell>, vide si aucune Cell ne l'est.
+	 */
+	public List<Cell> getEmptyCells() {
+		List<Cell> result = new ArrayList<>();
+		for (Cell cell : this.getCells()) {
+			if (cell.isEmpty()) {
+				result.add(cell);
+			}
+		}
+		return result;
+	}
+
 	/**
 	 * Vide une Cell donnée.
+	 * 
 	 * @param cell Cell, à vider.
 	 */
 	public void empty(Cell cell) {
@@ -175,5 +148,52 @@ public class MultiDoku {
 		Cell cellToEmpty = cells.get(cells.indexOf(cell));
 		cellToEmpty.setSymbolIndex(Cell.NOSYMBOL);
 	}
-}
 
+	/**
+	 * Renvoie le nombre de Cell contenue dans le MultiDoku.
+	 * 
+	 * @return int, nombre de Cell dans le MultiDoku.
+	 */
+	public int getNbCells() {
+		return getCells().size();
+	}
+
+	/**
+	 * Change les Cells de ce MultiDoku avec des symboles, en Cells immuables.
+	 */
+	public void setFilledCellsImmutable() {
+		for (Cell filledCell : getFilledCells()) {
+			filledCell.setImmutable();
+		}
+	}
+
+	public StateManager getStateManager() {
+		return stateManager;
+	}
+
+	/**
+	 * Renvoie une Cell vide choisie aléatoirement.
+	 *
+	 * @param rand Random, pour le choix aléatoire.
+	 * @return Cell, une Cell vide.
+	 */
+	public Cell getRandomEmptyCell(Random rand) {
+		List<Cell> emptyCells = getEmptyCells();
+		int randomIndex = rand.nextInt(emptyCells.size());
+		return emptyCells.get(randomIndex);
+	}
+
+	public void clearMutableCells() {
+		for (Sudoku s : getSubGrids()) {
+			for (Cell cell : s.getCells()) {
+				if (cell.isMutable())
+					cell.clearCurrentSymbol();
+			}
+		}
+	}
+
+	public MultiDoku clone() {
+		// TODO: aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaah
+		return SudokuSerializer.deserializeSudoku(SudokuSerializer.serializeSudoku(this));
+	}
+}

app/src/main/java/sudoku/structure/StateManager.java

@@ -0,0 +1,49 @@
+package sudoku.structure;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Stack;
+
+//TODO: doc
+public class StateManager {
+
+	private final Stack<Map<Cell, Integer>> states;
+	private final MultiDoku doku;
+
+	public StateManager(MultiDoku doku) {
+		this.states = new Stack<>();
+		this.doku = doku;
+	}
+
+	public Map<Cell, Integer> pushState() {
+		states.add(saveState());
+		return states.getLast();
+	}
+
+	public void popState() {
+		assert (states.size() > 0);
+		restoreState(states.pop());
+	}
+
+	public Map<Cell, Integer> popAndGetState() {
+		assert (states.size() > 0);
+		var currentState = saveState();
+		restoreState(states.pop());
+		return currentState;
+	}
+
+	private void restoreState(Map<Cell, Integer> state) {
+		for (var entry : state.entrySet()) {
+			entry.getKey().setSymbolIndex(entry.getValue());
+		}
+	}
+
+	private Map<Cell, Integer> saveState() {
+		Map<Cell, Integer> state = new HashMap<>();
+		for (Cell cell : this.doku.getCells()) {
+			state.put(cell, cell.getSymbolIndex());
+		}
+		return state;
+	}
+
+}

app/src/main/java/sudoku/structure/Sudoku.java

@@ -1,10 +1,11 @@
 package sudoku.structure;
 
-import sudoku.constraint.IConstraint;
-
 import java.util.ArrayList;
 import java.util.List;
 
+import sudoku.constraint.Constraint;
+import sudoku.constraint.IConstraint;
+
 /**
  * @class Sudoku
  * @brief Représent un Sudoku
@@ -18,13 +19,14 @@ public class Sudoku {
 	/**
 	 * Liste des Cells contenus dans le Sudoku.
 	 */
-	private final List<Cell> cells;
+	private List<Cell> cells = new ArrayList<>();
 	/**
 	 * Liste des contraintes (TODO) du Sudoku.
 	 */
 	private final List<IConstraint> constraints;
 	/**
-	 * Largeur des Blocks s'ils sont rectangulaires, sinon ça vaut 0.
+	 * Largeur des Blocks s'ils sont rectangulaires, valant 0 si ce n'est pas le
+	 * cas.
 	 */
 	private int blockWidth;
 
@@ -35,17 +37,18 @@ public class Sudoku {
 	}
 
 	/**
-	 * Transforme un index de Cell en Coordiante.
+	 * Transforme un index de Cell en Coordinate.
 	 *
 	 * @param index int, index d'une Cell.
 	 * @return Coordinate, correspondante à l'index donné.
 	 */
 	public Coordinate toCoords(int index) {
-		return new Coordinate( index % getSize(), index / getSize() );
+		return new Coordinate(index % getSize(), index / getSize());
 	}
 
 	/**
 	 * Transforme des coordonées d'une Cell en index.
+	 * 
 	 * @param x int, abscisse.
 	 * @param y int, ordonnée.
 	 * @return int, index correspondant.
@@ -56,7 +59,9 @@ public class Sudoku {
 
 	/**
 	 * Vérifie que des coordonnées correspondent bien à une Cell dans le Sudoku.
-	 * @return boolean, wether the coords are in the sudoku
+	 * 
+	 * @return boolean, valant true si les coordonnées sont dans les bornes du
+	 *         Sudoku, false sinon.
 	 */
 	public boolean isValidCoords(int x, int y) {
 		int index = toIndex(x, y);
@@ -64,12 +69,24 @@ public class Sudoku {
 	}
 
 	/**
-	 * @return wether the coords are in the sudoku
+	 * Vérifie que l'index correspond bien à une Cell dans le Sudoku.
+	 * 
+	 * @return boolean, valant true si l'index est dans les bornes du Sudoku, false
+	 *         sinon.
 	 */
 	public boolean isValidCoords(int index) {
 		return index < getSize() * getSize();
 	}
 
+	/**
+	 * Teste si on peut placer la value dans la Cell aux coordonnées x, y d'après
+	 * les contraintes du Sudoku.
+	 * 
+	 * @param x     int, abscisse de la Cell voulue.
+	 * @param y     int, ordonnée de la Cell voulue.
+	 * @param value int, index du symbole qu'on veut placer.
+	 * @return boolean, true si on peut la placer et false sinon.
+	 */
 	public boolean canBePlaced(int x, int y, int value) {
 		for (IConstraint constraint : this.constraints) {
 			if (!constraint.canBePlaced(this, x, y, value)) {
@@ -79,14 +96,12 @@ public class Sudoku {
 		return true;
 	}
 
-	public boolean tryPlaceCellSymbol(int x, int y, int value) {
+	/**
-		assert (isValidCoords(x, y));
+	 * Vide la Cell dotn les coordonnées sont renseignées de son symbole.
-		if (!canBePlaced(x, y, value))
+	 * 
-			return false;
+	 * @param x int, abscisse de la Cell voulue.
-		Cell cell = getCell(x, y);
+	 * @param y int, coordonnée de la Cell voulue.
-		cell.setSymbolIndex(value);
+	 */
-		return true;
-	}
 
 	public void clearCell(int x, int y) {
 		assert (isValidCoords(x, y));
@@ -94,6 +109,9 @@ public class Sudoku {
 		cell.setSymbolIndex(Cell.NOSYMBOL);
 	}
 
+	/**
+	 * Vide toutes les Cell du Sudoku.
+	 */
 	public void clear() {
 		for (int i = 0; i < getSize() * getSize(); i++) {
 			Cell cell = getCell(i);
@@ -107,9 +125,12 @@ public class Sudoku {
 	}
 
 	/**
-	 * Try to place a cell at the given coordinate
+	 * Place le symbole d'index value dans la Cell de coordonnées précisées.
-	 *
+	 * 
-	 * @return Cell created or null if it can't be done
+	 * @param x     int, abscisse de la Cell voulue.
+	 * @param y     int, coordonnée de la Cell voulue.
+	 * @param value int, index du symbole à placer.
+	 * @return Cell, la Cell qui a été modifiée.
 	 */
 	public Cell setCellSymbol(int x, int y, int value) {
 		assert (isValidCoords(x, y));
@@ -123,6 +144,12 @@ public class Sudoku {
 		return cell;
 	}
 
+	/**
+	 * Place les symboles d'index contenus dans values dans les cases du Sudoku.
+	 * 
+	 * @param values List<Integer>, liste des index des symboles à placer.
+	 * @return boolean, vaut true si les symboles ont été placés, false sinon.
+	 */
 	public boolean setCellsSymbol(List<Integer> values) {
 		if (values.size() > this.cells.size()) {
 			return false;
@@ -136,6 +163,13 @@ public class Sudoku {
 		return true;
 	}
 
+	/**
+	 * Place les symboles d'index contenus dans values dans les cases du Sudoku et
+	 * rend ces cases immuables.
+	 * 
+	 * @param values List<Integer>, liste des index des symboles à placer.
+	 * @return boolean, vaut true si les symboles ont été placés, false sinon.
+	 */
 	public boolean setImmutableCellsSymbol(List<Integer> values) {
 		if (values.size() > this.cells.size()) {
 			return false;
@@ -156,7 +190,7 @@ public class Sudoku {
 	}
 
 	public Cell getCell(int x, int y) {
-		int index = y * getSize() + x;
+		int index = toIndex(x, y);
 		assert (isValidCoords(x, y));
 		try {
 			return this.cells.get(index);
@@ -185,56 +219,16 @@ public class Sudoku {
 		return this.blocks;
 	}
 
+	/**
+	 * Vérifie si une Cell appartient au Sudoku.
+	 * 
+	 * @param cell Cell, cellule dont on veut vérifier l'appartenance au Sudoku.
+	 * @return boolean, vaut true si la Cell appartient au Sudoku.
+	 */
 	public boolean contains(Cell cell) {
 		return this.cells.contains(cell);
 	}
 
-	private Coordinate getCoordinateCell(Cell c) throws Exception {
-		int x = 0, y = 0;
-		int size = this.getSize();
-
-		if (!this.contains(c)) {
-			throw new Exception("The given cell is not in this sudoku.");
-		}
-
-		// TODO: use this.cells.indexOf();
-
-		for (Cell cell : this.cells) {
-			if (cell == c) {
-				return new Coordinate(x, y);
-			}
-			if (x == size - 1) {
-				y += 1;
-				x = 0;
-			} else {
-				x += 1;
-			}
-		}
-		return new Coordinate(x, y);
-	}
-
-	public void updateSymbolsPossibilities() throws Exception {
-		for (IConstraint constraint : constraints) {
-			List<Cell> cells = this.getCells();
-			for (Cell cell : cells) {
-				Coordinate coord = null;
-				try {
-					coord = this.getCoordinateCell(cell);
-				} catch (Exception e) {
-					throw new RuntimeException(e);
-				}
-				List<Integer> newPossibleSymbols = cell.getPossibleSymbols();
-				newPossibleSymbols.retainAll(constraint.getPossibleSymbols(this, coord.getX(), coord.getY()));
-
-				cell.setPossibleSymbols(newPossibleSymbols);
-
-				if (cell.getPossibleSymbols().isEmpty()) {
-					throw new Exception("Rollback bitch");
-				}
-			}
-		}
-	}
-
 	public String toString() {
 		StringBuilder sb = new StringBuilder();
 		sb.append("Sudoku {");
@@ -249,6 +243,11 @@ public class Sudoku {
 		return sb.toString();
 	}
 
+	/**
+	 * Renvoie la 1re Cell vide du Sudoku.
+	 * 
+	 * @return Cell, une Cell vide, ou null s'il n'y en a pas.
+	 */
 	public Cell getFirstEmptyCell() {
 		for (Cell cell : this.cells) {
 			if (cell.isEmpty()) {
@@ -258,70 +257,48 @@ public class Sudoku {
 		return null;
 	}
 
-	public List<Integer> getPossibleSymbolsOfCell(Cell cellToFill) {
+	/**
-		List<Integer> result = new ArrayList<>();
+	 * Vérifie si le Sudoku est résolue, soit complet et cohérent avec ses
-		Coordinate cellCoordinates;
+	 * contraintes.
-		try {
+	 * 
-			cellCoordinates = this.getCoordinateCell(cellToFill);
+	 * @return boolean, valant true si le Sudoku est résolu, false sinon.
-		} catch (Exception e) {
+	 */
-			return result;
+	public boolean isSolved() {
-		}
+		boolean isComplete = isComplete();
-		for (int i = 0; i < this.constraints.size(); i++) {
+		boolean isValid = isValid();
-			IConstraint constraint = this.constraints.get(i);
+		return isComplete && isValid;
-			if (i == 0) {
-				result.addAll(constraint.getPossibleSymbols(this, cellCoordinates.getX(), cellCoordinates.getY()));
-			} else {
-				result.retainAll(constraint.getPossibleSymbols(this, cellCoordinates.getX(), cellCoordinates.getY()));
-			}
-		}
-		return result;
 	}
 
-	public boolean isValid() {
+	/**
-		for (Cell cell : this.cells) {
+	 * Vérifie que le Sudoku est complet, soit qu'il n'y ait aucune case vide.
-			if (cell.isMutable()) {
+	 * 
-				if (cell.isEmpty()) {
+	 * @return boolean, true si le Sudoku est complet, false sinon.
-					return false;
+	 */
-				}
+	private boolean isComplete() {
-				for (IConstraint constraint : this.constraints) {
+		return getFirstEmptyCell() == null;
-					Coordinate coords;
-					try {
-						int symbolPlaced = cell.getSymbolIndex();
-						coords = this.getCoordinateCell(cell);
-
-						cell.setSymbolIndex(Cell.NOSYMBOL);
-						List<Integer> possibleSymbols = constraint.getPossibleSymbols(this, coords.getX(),
-								coords.getY());
-						cell.setSymbolIndex(symbolPlaced);
-						if (possibleSymbols.size() != 1 || possibleSymbols.get(0) != symbolPlaced) {
-							return false;
-						}
-
-					} catch (Exception e) {
-						throw new RuntimeException(e);
-					}
-				}
-			}
-		}
-		return true;
 	}
 
-	@Override
+	/**
-	public boolean equals(Object object) {
+	 * Vérifie si le Sudoku est valide, soit qu'il est cohérent avec ses
-		if (!(object instanceof Sudoku)) {
+	 * contraintes.
-			return false;
+	 * 
-		}
+	 * @return bollean, true si le Sudoku est valide, false sinon
+	 */
+	private boolean isValid() {
+		for (int i = 0; i < cells.size(); i++) {
+			Cell cell = getCell(i);
+			if (cell.isEmpty())
+				continue;
 
-		if (this.getSize() != ((Sudoku) object).getSize()) {
+			Coordinate coordinate = toCoords(i);
-			return false;
-		}
 
-		for (int i = 0; i < this.getSize(); i++) {
+			int symbolPlaced = cell.empty();
-			if (this.getCell(i).getSymbolIndex() != ((Sudoku) object).getCell(i).getSymbolIndex()) {
+			if (!canBePlaced(coordinate.getX(), coordinate.getY(), symbolPlaced)) {
+				cell.setSymbolIndex(symbolPlaced);
 				return false;
 			}
+			cell.setSymbolIndex(symbolPlaced);
 		}
-
 		return true;
 	}
 
@@ -329,4 +306,8 @@ public class Sudoku {
 		this.blockWidth = blockWidth;
 	}
 
+	public boolean hasConstraint(Constraint constraint) {
+		return this.constraints.contains(constraint.getConstraint());
+	}
+
 }

app/src/main/java/sudoku/structure/SudokuFactory.java

@@ -1,22 +1,41 @@
 package sudoku.structure;
 
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.Random;
 
-import sudoku.constraint.BlockConstraint;
+import sudoku.constraint.Constraint;
-import sudoku.constraint.ColumnConstraint;
 import sudoku.constraint.IConstraint;
-import sudoku.constraint.LineConstraint;
+import sudoku.io.SudokuSerializer;
+import sudoku.solver.RandomSolver;
 import sudoku.solver.Solver;
 
 public class SudokuFactory {
 
+	/**
+	 * Générateur de nombre aléatoire.
+	 */
 	private static final Random random = new Random();
-	public static List<IConstraint> DEFAULT_CONSTRAINTS = Arrays.asList(new BlockConstraint(), new LineConstraint(), new ColumnConstraint());
 
+	/**
+	 * Liste des contraintes par défaut d'un Multi- ou Sudoku.
+	 * Comprend les contraintes de blocs, de lignes, et de colonnes.
+	 */
+	public static List<IConstraint> DEFAULT_CONSTRAINTS = SudokuFactory
+			.fromConstraints(Arrays.asList(Constraint.Block, Constraint.Column,
+					Constraint.Line));
+
+	/**
+	 * Créée des Cells et les met dans une liste de taille size.
+	 * 
+	 * @param size int, nombre de Cells à initialiser.
+	 * @return List<Cell>, liste des Cells initialisées.
+	 */
 	private static List<Cell> initCells(int size) {
 		List<Cell> cells = new ArrayList<>(size * size);
 		for (int i = 0; i < size * size; i++) {
@@ -25,6 +44,15 @@ public class SudokuFactory {
 		return cells;
 	}
 
+	/**
+	 * Créée des Blocks de taille width par height à partir des cellules données, et
+	 * les met dans une liste.
+	 * 
+	 * @param cells  List<Cell>, liste des Cells à découper en Blocks.
+	 * @param width  int, largeur des Blocks à créer.
+	 * @param height int, hauteur des Blocks à créer.
+	 * @return List<Block>, liste des Blocks créés.
+	 */
 	private static List<Block> initRectangleBlocs(List<Cell> cells, int width, int height) {
 		List<Block> blocs = new ArrayList<>();
 		int size = width * height;
@@ -48,16 +76,39 @@ public class SudokuFactory {
 		return blocs;
 	}
 
-	public static MultiDoku createBasicEmptyRectangleSudoku(int widthBlock, int heightBlock) {
+	/**
-		Sudoku s = createRectangleSudoku(widthBlock, heightBlock);
+	 * Créée un MultiDoku vide dont les Blocks sont de taille widthBlock par
-		return new MultiDoku(Arrays.asList(s));
+	 * heightBlock.
+	 * 
+	 * @param widthBlock  int, largeur des Blocks.
+	 * @param heightBlock int, hauteur des Blocks.
+	 * @return MultiDoku, MultiDoku vide.
+	 */
+	public static MultiDoku createBasicEmptyRectangleDoku(int widthBlock, int heightBlock,
+			List<IConstraint> constraints) {
+		return new MultiDoku(Arrays.asList(createRectangleSudoku(widthBlock, heightBlock, constraints)));
 	}
 
-	public static MultiDoku createBasicEmptySquareSudoku(int size) {
+	/**
-		return createBasicEmptyRectangleSudoku(size, size);
+	 * Créée un MultiDoku vide dont les Blocks sont carrés de longueur size.
+	 * 
+	 * @param size int, taille des Blocks.
+	 * @return MultiDoku, MultiDoku vide.
+	 */
+	public static MultiDoku createBasicEmptySquareDoku(int size, List<IConstraint> constraints) {
+		return new MultiDoku(Arrays.asList(createSquareSudoku(size, constraints)));
 	}
 
-	public static void setIMMutableCells(MultiDoku doku, Map<Coordinate, Integer> immutableCells) {
+	/**
+	 * Place des Cells immutables de valeurs fournies, aux Coordinate fournies dans
+	 * le MultiDoku doku fourni.
+	 * 
+	 * @param doku           MultiDoku, MultiDoku à remplir.
+	 * @param immutableCells Map<Coordinate, Integer>, association de Coordinate
+	 *                       coordonnées et Integer valeurs, correspondant aux cases
+	 *                       à remplir.
+	 */
+	public static void setImmutableCells(MultiDoku doku, Map<Coordinate, Integer> immutableCells) {
 		immutableCells.forEach((coordinate, symbol) -> {
 			for (Sudoku sudoku : doku.getSubGrids()) {
 				Cell cell = sudoku.getCell(coordinate.getX(), coordinate.getY());
@@ -69,65 +120,95 @@ public class SudokuFactory {
 		});
 	}
 
-	public static boolean newDokuFromFilledOne (MultiDoku doku, int difficulty) throws Exception {
+	/**
+	 * Créée un MultiDoku de difficulté difficulty à partir d'un MultiDoku fourni.
+	 *
+	 * @param doku           MultiDoku, MultiDoku dont on doit vider des Cells.
+	 * @param nbCellsToEmpty int, nombre de cases à retirer.
+	 * @return boolean, valant true si un MultiDoku de difficulté donnée peut être
+	 *         créée, false sinon.
+	 * @throws Exception si la difficulté n'est pas compatible avec la taille du
+	 *                   MultiDoku.
+	 */
+	public static boolean newDokuFromFilledOne(MultiDoku doku, int nbCellsToEmpty, Solver solver) throws Exception {
 
-		if (difficulty > doku.getCells().size()) {
+		if (nbCellsToEmpty >= doku.getCells().size()) {
 			throw new Exception();
 		}
 
-		if (difficulty == 0) {
+		if (nbCellsToEmpty == 0) {
 			return true;
 		}
 
 		List<Cell> cellsThatCanBeEmptied = doku.getFilledCells();
 
-		while (!cellsThatCanBeEmptied.isEmpty()) {
+		int index = random.nextInt(cellsThatCanBeEmptied.size());
-			int index = random.nextInt(cellsThatCanBeEmptied.size());
+		Cell cellToEmpty = cellsThatCanBeEmptied.get(index);
-			Cell cellToEmpty = cellsThatCanBeEmptied.get(index);
 
-			int oldSymbol = cellToEmpty.empty();
+		cellToEmpty.empty();
 
-			if (Solver.countSolution(doku) == 1) {
+		int nbDokuSultions = solver.countSolution(doku);
-				if (newDokuFromFilledOne(doku, --difficulty)) {
+		if (nbDokuSultions == 1) {
-					return true;
+            return newDokuFromFilledOne(doku, --nbCellsToEmpty, solver);
-				}
-			}
-
-			cellToEmpty.setSymbolIndex(oldSymbol);
-			cellsThatCanBeEmptied.remove(cellToEmpty);
 		}
 
 		return false;
-    }
+	}
 
-	private static Sudoku createRectangleSudoku(int width, int height) {
+	/**
-		int symbolCount = width * height;
+	 * Créée un Sudoku vide dont les Blocks sont de taille widthBlock par
+	 * heightBlock.
+	 * 
+	 * @param widthBlock  int, largeur des Blocks.
+	 * @param heightBlock int, hauteur des Blocks.
+	 * @return Sudoku, Sudoku vide.
+	 */
+	private static Sudoku createRectangleSudoku(int widthBlock, int heightBlock, List<IConstraint> constraints) {
+		int symbolCount = widthBlock * heightBlock;
 		List<Cell> cases = initCells(symbolCount);
-		List<Block> blocs = initRectangleBlocs(cases, width, height);
+		List<Block> blocs = initRectangleBlocs(cases, widthBlock, heightBlock);
-		Sudoku s = new Sudoku(cases, blocs, DEFAULT_CONSTRAINTS);
+		Sudoku s = new Sudoku(cases, blocs, constraints);
-		s.setBlockWidth(width);
+		for (Block block : s.getBlocks()) {
+			block.getSudokus().add(s);
+		}
+		s.setBlockWidth(widthBlock);
 		return s;
 	}
 
-	private static Sudoku createSquareSudoku(int size) {
+	/**
-		return createRectangleSudoku(size, size);
+	 * Créée un Sudoku vide dont les Blocks sont carrés de longueur size.
+	 * 
+	 * @param size int, taille des Blocks.
+	 * @return Sudoku, Sudoku vide.
+	 */
+	private static Sudoku createSquareSudoku(int size, List<IConstraint> constraints) {
+		return createRectangleSudoku(size, size, constraints);
 	}
 
-	private static void linkSquareSudokus(Sudoku sudoku1, Sudoku sudoku2, Coordinate offset) {
+	/**
+	 * Connecte deux Sudokus selon la décalage offset fourni.
+	 * 
+	 * @param sudoku1 Sudoku, premier sudoku à connecter.
+	 * @param sudoku2 Sudoku, second sudoku à connecter.
+	 * @param offset  Coordinate, décalage entre les deux Sudokus.
+	 */
+	private static void linkRectangleSudokus(Sudoku sudoku1, Sudoku sudoku2, Coordinate offset) {
 		int blockWidth = sudoku1.getBlockWidth();
-		for (int dx = 0; dx < blockWidth; dx++) {
+		int blockHeight = sudoku1.getSize() / blockWidth;
+		for (int dx = 0; dx < blockHeight; dx++) {
 			for (int dy = 0; dy < blockWidth; dy++) {
 				int block1X = dx + offset.getX();
 				int block1Y = dy + offset.getY();
 				int block2X = dx;
 				int block2Y = dy;
 
-				if ((block1X < blockWidth) && (block1X >= 0) && (block1Y >= 0) && (block1Y < blockWidth)) {
+				if ((block1X < blockHeight) && (block1X >= 0) && (block1Y >= 0) && (block1Y < blockWidth)) {
-					Block block1 = sudoku1.getBlocks().get(block1Y * blockWidth + block1X);
+					Block block1 = sudoku1.getBlocks().get(block1Y * blockHeight + block1X);
-					Block block2 = sudoku2.getBlocks().get(block2Y * blockWidth + block2X);
+					Block block2 = sudoku2.getBlocks().get(block2Y * blockHeight + block2X);
 
 					// on remplace le bloc
-					sudoku2.getBlocks().set(block2Y * blockWidth + block2X, block1);
+					sudoku2.getBlocks().set(block2Y * blockHeight + block2X, block1);
+					block1.getSudokus().add(sudoku2);
 
 					// on remplace les cellules
 					for (int i = 0; i < block1.getCells().size(); i++) {
@@ -142,26 +223,149 @@ public class SudokuFactory {
 		}
 	}
 
-	public static MultiDoku createBasicSquareMultidoku(int size) {
+	/**
+	 * Créée un MultiDoku de Blocks carrés de taille size composé de cinq Sudokus,
+	 * dont un central qui partage chacun de ses Blockss d'angle avec un autre
+	 * Sudoku.
+	 * 
+	 * @param size int, largeur des Blocks unitraires des Sudokus à crééer.
+	 * @return MultiDoku, MultiDoku de forme X.
+	 */
+	public static MultiDoku createBasicXShapedMultidoku(int size, List<IConstraint> constraints) {
 		assert (size > 1);
 
-		/**
+		return createBasicXShapedMultidoku(size, size, constraints);
+	}
+
+	/**
+	 * Créée un MultiDoku de Blocks rectangulaires de forme width par height composé
+	 * de cinq Sudokus,
+	 * dont un central qui partage chacun de ses Blocks d'angle avec un autre
+	 * Sudoku.
+	 *
+	 * @param width  int, largeur des Blocks unitraires des Sudokus à crééer.
+	 * @param height int, hauteur des Blocks unitraires des Sudokus à crééer.
+	 * @return MultiDoku, MultiDoku de forme X.
+	 */
+	public static MultiDoku createBasicXShapedMultidoku(int width, int height, List<IConstraint> constraints) {
+		assert (width > 1 && height > 1);
+
+		/*
 		 * 2 3
 		 *  1
 		 * 4 5
 		 */
 
-		Sudoku sudoku1 = createSquareSudoku(size);
+		Sudoku sudoku1 = createRectangleSudoku(width, height, constraints);
-		Sudoku sudoku2 = createSquareSudoku(size);
+		Sudoku sudoku2 = createRectangleSudoku(width, height, constraints);
-		Sudoku sudoku3 = createSquareSudoku(size);
+		Sudoku sudoku3 = createRectangleSudoku(width, height, constraints);
-		Sudoku sudoku4 = createSquareSudoku(size);
+		Sudoku sudoku4 = createRectangleSudoku(width, height, constraints);
-		Sudoku sudoku5 = createSquareSudoku(size);
+		Sudoku sudoku5 = createRectangleSudoku(width, height, constraints);
 
-		linkSquareSudokus(sudoku1, sudoku2, new Coordinate(1 - size, 1 - size));
+		linkRectangleSudokus(sudoku1, sudoku2, new Coordinate(1 - height, 1 - width));
-		linkSquareSudokus(sudoku1, sudoku3, new Coordinate(size - 1, 1 - size));
+		linkRectangleSudokus(sudoku1, sudoku3, new Coordinate(height - 1, 1 - width));
-		linkSquareSudokus(sudoku1, sudoku4, new Coordinate(1 - size, size - 1));
+		linkRectangleSudokus(sudoku1, sudoku4, new Coordinate(1 - height, width - 1));
-		linkSquareSudokus(sudoku1, sudoku5, new Coordinate(size - 1, size - 1));
+		linkRectangleSudokus(sudoku1, sudoku5, new Coordinate(height - 1, width - 1));
 
 		return new MultiDoku(Arrays.asList(sudoku1, sudoku2, sudoku3, sudoku4, sudoku5));
 	}
+
+	/**
+	 * TODO
+	 * Créée un MultiDoku de Blocks carrés de taille size composé de cinq Sudokus,
+	 * dont un central qui partage chacun de ses Blockss d'angle avec un autre
+	 * Sudoku.
+	 *
+	 * @param size int, largeur des Blocks unitraires des Sudokus à crééer.
+	 * @return MultiDoku, MultiDoku de forme X.
+	 */
+	public static MultiDoku createBasicPlusShapedMultidoku(int size, List<IConstraint> constraints) {
+		assert (size > 1);
+
+		return createBasicPlusShapedMultidoku(size, size, constraints);
+	}
+
+	/**
+	 * TODO
+	 * Créée un MultiDoku de Blocks rectangulaires de forme width par height composé
+	 * de cinq Sudokus,
+	 * dont un central qui partage chacun de ses Blocks d'angle avec un autre
+	 * Sudoku.
+	 *
+	 * @param width  int, largeur des Blocks unitraires des Sudokus à crééer.
+	 * @param height int, hauteur des Blocks unitraires des Sudokus à crééer.
+	 * @return MultiDoku, MultiDoku de forme X.
+	 */
+	public static MultiDoku createBasicPlusShapedMultidoku(int width, int height, List<IConstraint> constraints) {
+		assert (width > 1 && height > 1);
+
+		/*
+		 *   3
+		 * 2 1 4
+		 *   5
+		 */
+
+		Sudoku sudoku1 = createRectangleSudoku(width, height, constraints);
+		Sudoku sudoku2 = createRectangleSudoku(width, height, constraints);
+		Sudoku sudoku3 = createRectangleSudoku(width, height, constraints);
+		Sudoku sudoku4 = createRectangleSudoku(width, height, constraints);
+		Sudoku sudoku5 = createRectangleSudoku(width, height, constraints);
+
+		linkRectangleSudokus(sudoku1, sudoku2, new Coordinate(1 - height, 0));
+		linkRectangleSudokus(sudoku1, sudoku3, new Coordinate(0, 1 - width));
+		linkRectangleSudokus(sudoku1, sudoku4, new Coordinate(height - 1, 0));
+		linkRectangleSudokus(sudoku1, sudoku5, new Coordinate(0, width - 1));
+
+		return new MultiDoku(Arrays.asList(sudoku1, sudoku2, sudoku3, sudoku4, sudoku5));
+	}
+
+	public static void fillDoku(MultiDoku doku, Difficulty difficulty) throws Exception {
+		Solver solver = new RandomSolver();
+		solver.solve(doku);
+		int nbCellsToEmpty = (int) (difficulty.getFactor() * doku.getNbCells());
+		boolean successfull = newDokuFromFilledOne(doku, nbCellsToEmpty, solver);
+		doku.setFilledCellsImmutable();
+	}
+
+	public static MultiDoku fromfile(String filePath) {
+		try {
+			String content = Files.readString(Paths.get(filePath));
+			MultiDoku doku = SudokuSerializer.deserializeSudoku(content);
+			return doku;
+		} catch (IOException e) {
+			e.printStackTrace();
+			return null;
+		}
+	}
+
+	public static MultiDoku createBasicEmptyRandomBlockDoku(int blockSize, List<IConstraint> constraints) {
+		int blockCellCount = blockSize * blockSize;
+		List<Cell> cells = initCells(blockCellCount);
+        List<Cell> homeLessCells = new ArrayList<>(cells);
+		List<Block> blocks = new ArrayList<>();
+		Random r = new Random();
+		for (int i = 0; i < blockCellCount; i++) {
+			Block b = new Block();
+			for (int j = 0; j < blockCellCount; j++) {
+				int cellIndex = r.nextInt(homeLessCells.size());
+				Cell cell = homeLessCells.remove(cellIndex);
+				b.addCell(cell);
+				cell.setBlock(b);
+			}
+			blocks.add(b);
+		}
+		Sudoku sudoku = new Sudoku(cells, blocks, constraints);
+		for (Block block : blocks) {
+			block.getSudokus().add(sudoku);
+		}
+		return new MultiDoku(Arrays.asList(sudoku));
+	}
+
+	public static List<IConstraint> fromConstraints(List<Constraint> constraints) {
+		List<IConstraint> iconstraints = new ArrayList<>();
+		for (Constraint cons : constraints) {
+			iconstraints.add(cons.getConstraint());
+		}
+		return iconstraints;
+	}
 }

app/src/test/java/sudoku/SudokuSerializerTest.java

@@ -3,34 +3,76 @@ package sudoku;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import java.io.File;
+import java.util.Random;
+
 import org.json.JSONObject;
 import org.junit.jupiter.api.Test;
 
-import sudoku.io.SudokuPrinter;
 import sudoku.io.SudokuSerializer;
+import sudoku.solver.RandomSolver;
+import sudoku.structure.MultiDoku;
 import sudoku.structure.SudokuFactory;
 
-import java.util.Random;
-
 public class SudokuSerializerTest {
 
     void testSerializeWithSize(int blockWidth, int blockHeight) {
-        var sudoku = SudokuFactory.createBasicEmptyRectangleSudoku(blockWidth, blockHeight);
+        var sudoku = SudokuFactory.createBasicEmptyRectangleDoku(blockWidth, blockHeight,
+                SudokuFactory.DEFAULT_CONSTRAINTS);
+        new RandomSolver().solve(sudoku);
         JSONObject data = SudokuSerializer.serializeSudoku(sudoku);
-        SudokuSerializer.saveMultiDoku(sudoku);
+        MultiDoku multiDoku = SudokuSerializer.deserializeSudoku(data);
-        //MultiDoku multiDoku = SudokuSerializer.deserializeSudoku(data);
+        assertTrue(data.toString().equals(SudokuSerializer.serializeSudoku(multiDoku).toString()));
-        //assertEquals(data, SudokuSerializer.serializeSudoku(multiDoku));
+    }
+
+    void testSaveWithSize(int blockWidth, int blockHeight) {
+        MultiDoku doku = SudokuFactory.createBasicEmptyRectangleDoku(blockWidth, blockHeight,
+                SudokuFactory.DEFAULT_CONSTRAINTS);
+        new RandomSolver().solve(doku);
+        String savePath = SudokuSerializer.saveMultiDoku(doku);
+        MultiDoku otherDoku = null;
+        try {
+            otherDoku = SudokuFactory.fromfile(savePath);
+            assert (otherDoku != null);
+
+            assertEquals(SudokuSerializer.serializeSudoku(doku).toString(),
+                    SudokuSerializer.serializeSudoku(otherDoku).toString());
+            // clean file after test
+            File fileToDelete = new File(savePath);
+            fileToDelete.delete();
+        } catch (Exception e) {
+            e.printStackTrace();
+            assert false;
+        }
+    }
+
+    void testSerializeX(int size) {
+        var sudoku = SudokuFactory.createBasicXShapedMultidoku(size, SudokuFactory.DEFAULT_CONSTRAINTS);
+        new RandomSolver().solve(sudoku);
+        JSONObject data = SudokuSerializer.serializeSudoku(sudoku);
+        MultiDoku multiDoku = SudokuSerializer.deserializeSudoku(data);
+
+        assertTrue(data.toString().equals(SudokuSerializer.serializeSudoku(multiDoku).toString()));
     }
 
     @Test
     void testSerialize() {
-        int testCount = 5;
         Random r = new Random();
+        int testCount = 20;
         for (int i = 0; i < testCount; i++) {
-            int blockWidth = r.nextInt(20) + 1;
+            int blockWidth = r.nextInt(4) + 1;
-            int blockHeight = r.nextInt(20) + 1;
+            int blockHeight = r.nextInt(4) + 1;
             testSerializeWithSize(blockWidth, blockHeight);
         }
+        for (int i = 0; i < testCount; i++) {
+            int blockWidth = r.nextInt(4) + 1;
+            int blockHeight = r.nextInt(4) + 1;
+            testSaveWithSize(blockWidth, blockHeight);
+        }
+        for (int i = 0; i < testCount; i++) {
+            int size = r.nextInt(2) + 2;
+            testSerializeX(size);
+        }
     }
 
 }

app/src/test/java/sudoku/solver/SolverTest.java

@@ -1,96 +1,104 @@
 package sudoku.solver;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import java.util.List;
+
 import org.junit.jupiter.api.Test;
+
+import gui.constants.Symbols;
 import sudoku.io.SudokuPrinter;
+import sudoku.io.SudokuSerializer;
 import sudoku.structure.Cell;
 import sudoku.structure.MultiDoku;
 import sudoku.structure.Sudoku;
 import sudoku.structure.SudokuFactory;
 
-import java.util.List;
-import java.util.Random;
-
 class SolverTest {
 
-    @Test
+	@Test
-    void solveTest() {
+	void solveTest() {
-        Random rand = new Random();
+		MultiDoku dokuToTest = SudokuFactory.createBasicEmptySquareDoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
+		MultiDoku dokuResult = SudokuFactory.createBasicEmptySquareDoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
 
-        MultiDoku dokuToTest = SudokuFactory.createBasicEmptySquareSudoku(3);
+		Sudoku sudokuToTest = dokuToTest.getSubGrid(0);
-        MultiDoku dokuResult = SudokuFactory.createBasicEmptySquareSudoku(3);
+		Sudoku sudokuResult = dokuResult.getSubGrid(0);
 
-        Sudoku sudokuToTest = dokuToTest.getSubGrid(0);
+		int ns = Cell.NOSYMBOL;
-        Sudoku sudokuResult = dokuResult.getSubGrid(0);
+		List<Integer> immutableCells = List.of(ns, ns, 0, ns, ns, 2, 8, ns, 1,
+				ns, 3, ns, ns, 5, 6, 7, ns, ns,
+				ns, ns, ns, 8, ns, 7, ns, ns, 6,
+				0, ns, 1, ns, ns, ns, ns, ns, ns,
+				4, 8, 7, 5, 1, ns, 6, ns, ns,
+				6, ns, 3, 2, ns, ns, ns, 8, 0,
+				ns, ns, 6, ns, ns, 8, ns, 7, 5,
+				8, 0, ns, 7, ns, 5, 2, ns, 3,
+				5, ns, ns, ns, 3, 1, 0, ns, ns);
 
-        int ns = Cell.NOSYMBOL;
+		assert (sudokuToTest.setImmutableCellsSymbol(immutableCells));
-        List<Integer> immutableCells = List.of(ns, ns,  0, ns, ns,  2,  8, ns,  1,
-                                               ns,  3, ns, ns,  5,  6,  7, ns, ns,
-                                               ns, ns, ns,  8, ns, 7, ns, ns,  6,
-                                                0, ns,  1, ns, ns, ns, ns, ns, ns,
-                                                4,  8,  7,  5,  1, ns,  6, ns, ns,
-                                                6, ns,  3,  2, ns, ns, ns,  8,  0,
-                                               ns, ns,  6, ns, ns,  8, ns,  7,  5,
-                                                8,  0, ns,  7, ns,  5,  2, ns,  3,
-                                                5, ns, ns, ns,  3,  1,  0, ns, ns);
 
-        assert(sudokuToTest.setImmutableCellsSymbol(immutableCells));
+		//SudokuPrinter.printRectangleSudoku(dokuToTest.getSubGrid(0), 3, 3);
+		SudokuPrinter.printMultiDoku(dokuToTest, 3, 3, Symbols.Numbers);
 
+		List<Integer> correctCells = List.of(7, 6, 0, 3, 4, 2, 8, 5, 1,
+				2, 3, 8, 1, 5, 6, 7, 0, 4,
+				1, 4, 5, 8, 0, 7, 3, 2, 6,
+				0, 2, 1, 6, 8, 3, 5, 4, 7,
+				4, 8, 7, 5, 1, 0, 6, 3, 2,
+				6, 5, 3, 2, 7, 4, 1, 8, 0,
+				3, 1, 6, 0, 2, 8, 4, 7, 5,
+				8, 0, 4, 7, 6, 5, 2, 1, 3,
+				5, 7, 2, 4, 3, 1, 0, 6, 8);
 
-        SudokuPrinter.printRectangleSudoku(dokuToTest.getSubGrid(0), 3, 3);
+		sudokuResult.setCellsSymbol(correctCells);
 
+		System.out.println("\n****************************Doku Control\n");
+		SudokuPrinter.printRectangleSudoku(sudokuResult, 3, 3, Symbols.Russian);
 
-        List<Integer> correctCells = List.of(7,  6,  0,  3,  4,  2,  8,  5,  1,
+		assert (dokuResult.isSolved());
-                                                2,  3,  8,  1,  5,  6,  7,  0,  4,
-                                                1,  4,  5,  8,  0,  7,  3,  2,  6,
-                                                0,  2,  1,  6,  8,  3,  5,  4,  7,
-                                                4,  8,  7,  5,  1,  0,  6,  3,  2,
-                                                6,  5,  3,  2,  7,  4,  1,  8,  0,
-                                                3,  1,  6,  0,  2,  8,  4,  7,  5,
-                                                8,  0,  4,  7,  6,  5,  2,  1,  3,
-                                                5,  7,  2,  4,  3,  1,  0,  6,  8);
 
-        sudokuResult.setCellsSymbol(correctCells);
+		new RandomSolver().solve(dokuToTest);
 
+		System.out.println("\n****************************\nDoku solved");
+		//SudokuPrinter.printRectangleSudoku(dokuToTest.getSubGrid(0), 3, 3);
+		SudokuPrinter.printMultiDoku(dokuToTest, 3, 3, Symbols.Emojis);
 
-        System.out.println("\n****************************Doku Control\n");
+		assert (dokuToTest.isSolved());
-        SudokuPrinter.printRectangleSudoku(sudokuResult, 3, 3);
 
+		for (Cell cell : sudokuToTest.getCells()) {
+			cell.setImmutable();
+		}
 
-        assert(dokuResult.isValid());
+		for (Cell cell : sudokuResult.getCells()) {
+			cell.setImmutable();
+		}
 
-        Solver.solveRandom(dokuToTest, rand);
+		assertEquals(SudokuSerializer.serializeSudoku(dokuResult).toString(),
+				SudokuSerializer.serializeSudoku(dokuToTest).toString());
 
+		MultiDoku dokuToTest2 = SudokuFactory.createBasicEmptySquareDoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
+		Sudoku sudokuToTest2 = dokuToTest2.getSubGrid(0);
 
-        System.out.println("\n****************************\nDoku solved");
+		List<Integer> immutableCells2 = List.of(ns, ns, 0, ns, ns, 2, 8, ns, 1,
-        SudokuPrinter.printRectangleSudoku(dokuToTest.getSubGrid(0), 3, 3);
+				1, 3, ns, ns, 5, 6, 7, ns, ns,
+				ns, ns, ns, 8, ns, 7, ns, ns, 6,
+				0, ns, 1, ns, ns, ns, ns, ns, ns,
+				4, 8, 7, 5, 1, ns, 6, ns, ns,
+				6, ns, 3, 2, ns, ns, ns, 8, 0,
+				ns, ns, 6, ns, ns, 8, ns, 7, 5,
+				8, 0, ns, 7, ns, 5, 2, ns, 3,
+				5, ns, ns, ns, 3, 1, 0, ns, ns);
+		sudokuToTest2.setImmutableCellsSymbol(immutableCells2);
 
+		boolean isSolved = new RandomSolver().solve(dokuToTest2);
 
-        assert(dokuToTest.isValid());
+		assert (!isSolved);
 
-        assert(dokuToTest.equals(dokuResult));
+		MultiDoku dokuToTest3 = SudokuFactory.createBasicEmptySquareDoku(3, SudokuFactory.DEFAULT_CONSTRAINTS);
 
-        MultiDoku dokuToTest2 = SudokuFactory.createBasicEmptySquareSudoku(3);
+		new RandomSolver().solve(dokuToTest3);
-        Sudoku sudokuToTest2 = dokuToTest2.getSubGrid(0);
 
-        List<Integer> immutableCells2 = List.of(ns, ns,  0, ns, ns,  2,  8, ns,  1,
+		//SudokuPrinter.printRectangleSudoku(dokuToTest3.getSubGrid(0), 3, 3);
-                                                1,  3, ns, ns,  5,  6,  7, ns, ns,
+		SudokuPrinter.printMultiDoku(dokuToTest3, 3, 3, Symbols.Letters);
-                                               ns, ns, ns,  8, ns, 7, ns, ns,  6,
+	}
-                                                0, ns,  1, ns, ns, ns, ns, ns, ns,
-                                                4,  8,  7,  5,  1, ns,  6, ns, ns,
-                                                6, ns,  3,  2, ns, ns, ns,  8,  0,
-                                               ns, ns,  6, ns, ns,  8, ns,  7,  5,
-                                                8,  0, ns,  7, ns,  5,  2, ns,  3,
-                                                5, ns, ns, ns,  3,  1,  0, ns, ns);
-        sudokuToTest2.setImmutableCellsSymbol(immutableCells2);
-
-        boolean isSolved = Solver.solveRandom(dokuToTest2, rand);
-
-        assert(!isSolved);
-
-        MultiDoku dokuToTest3 = SudokuFactory.createBasicEmptySquareSudoku(3);
-
-        Solver.solveRandom(dokuToTest3, rand);
-
-        SudokuPrinter.printRectangleSudoku(dokuToTest3.getSubGrid(0), 3, 3);
-    }
 }