refactor game

app/src/main/java/chess/model/Game.java

@@ -1,9 +1,22 @@
 package chess.model;
 
+import chess.model.pieces.Pawn;
+import common.Signal0;
+import common.Signal1;
+
 public class Game {
 	private final ChessBoard board;
 	private Color playerTurn;
 
+	public final Signal1<Coordinate> OnPromote = new Signal1<>();
+	public final Signal1<Color> OnWin = new Signal1<>();
+	public final Signal1<Color> OnPlayerTurn = new Signal1<>();
+
+	public final Signal0 OnCheck = new Signal0();
+	public final Signal0 OnMat = new Signal0();
+	public final Signal0 OnPat = new Signal0();
+
+
 	public Game(ChessBoard board) {
 		this.board = board;
 	}
@@ -22,6 +35,40 @@ public class Game {
 
 	public void switchPlayerTurn() {
 		playerTurn = Color.getEnemy(playerTurn);
+		this.OnPlayerTurn.emit(playerTurn);
+	}
+
+	public void checkPromotion(Coordinate pieceCoords) {
+
+		Piece piece = getBoard().pieceAt(pieceCoords);
+
+		if (piece == null || !(piece instanceof Pawn))
+			return;
+
+		int destY = pieceCoords.getY();
+
+		int enemyLine = piece.getColor() == Color.White ? 0 : 7;
+
+		if (destY == enemyLine) {
+			OnPromote.emit(pieceCoords);
+		}
+	}
+
+	public void checkGameStatus() {
+		final ChessBoard board = getBoard();
+
+		final Color enemy = Color.getEnemy(getPlayerTurn());
+
+		if (board.isKingInCheck(enemy)) {
+			if (board.hasAllowedMoves(enemy)) {
+				OnCheck.emit();
+			} else {
+				OnMat.emit();
+				OnWin.emit(getPlayerTurn());
+			}
+		} else if (!board.hasAllowedMoves(enemy)) {
+			OnPat.emit();
+		}
 	}
 
 }