promote not that uggly

app/src/main/java/chess/io/CommandExecutor.java

@@ -1,6 +1,12 @@
 package chess.io;
 
+import chess.io.commands.MoveCommand;
+import chess.model.ChessBoard;
+import chess.model.Color;
+import chess.model.Coordinate;
 import chess.model.Game;
+import chess.model.Piece;
+import chess.model.pieces.Pawn;
 
 public class CommandExecutor {
 
@@ -14,15 +20,18 @@ public class CommandExecutor {
 
 	public CommandResult executeCommand(Command command) {
 		CommandResult result = command.execute(this.game, this.outputSystem);
-		if (result == CommandResult.Moved)
+		if (result == CommandResult.Moved) {
+			checkPromotion(((MoveCommand) command).getMove().getFinish());
+			checkGameStatus();
 			alternatePlayers();
+		}
 		return result;
 	}
 
 	private void alternatePlayers() {
 		this.game.switchPlayerTurn();
 		this.outputSystem.playerTurn(this.game.getPlayerTurn());
-	}	
+	}
 
 	public void setOutputSystem(OutputSystem outputSystem) {
 		this.outputSystem = outputSystem;
@@ -32,4 +41,37 @@ public class CommandExecutor {
 		this.game = game;
 	}
 
+	private void checkPromotion(Coordinate pieceCoords) {
+
+		Piece piece = this.game.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) {
+			outputSystem.promotePawn(pieceCoords);
+		}
+	}
+
+	private void checkGameStatus() {
+		final ChessBoard board = game.getBoard();
+
+		final Color enemy = Color.getEnemy(game.getPlayerTurn());
+
+		if (board.isKingInCheck(enemy)) {
+			if (board.hasAllowedMoves(enemy)) {
+				outputSystem.kingIsInCheck();
+			} else {
+				outputSystem.kingIsInMat();
+				outputSystem.winnerIs(game.getPlayerTurn());
+			}
+		} else if (!board.hasAllowedMoves(enemy)) {
+			outputSystem.patSituation();
+		}
+	}
+
 }