promote gui

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

@@ -16,7 +16,6 @@ public class Game {
 	public final Signal0 OnMat = new Signal0();
 	public final Signal0 OnPat = new Signal0();
 
-
 	public Game(ChessBoard board) {
 		this.board = board;
 	}
@@ -39,23 +38,30 @@ public class Game {
 		this.OnPlayerTurn.emit(playerTurn);
 	}
 
-	public void checkPromotion(Coordinate pieceCoords) {
+	public boolean checkPromotion(Coordinate pieceCoords) {
 
 		Piece piece = getBoard().pieceAt(pieceCoords);
 
 		if (piece == null || !(piece instanceof Pawn))
-			return;
+			return false;
 
 		int destY = pieceCoords.getY();
 
 		int enemyLine = piece.getColor() == Color.White ? 0 : 7;
 
-		if (destY == enemyLine) {
-			OnPromote.emit(pieceCoords);
-		}
+		if (destY != enemyLine)
+			return false;
+
+		OnPromote.emit(pieceCoords);
+		return true;
+
 	}
 
-	public void checkGameStatus() {
+	/**
+	 * 
+	 * @return true if game should end
+	 */
+	public boolean checkGameStatus() {
 		final ChessBoard board = getBoard();
 
 		final Color enemy = Color.getEnemy(getPlayerTurn());
@@ -66,10 +72,30 @@ public class Game {
 			} else {
 				OnMat.emit();
 				OnWin.emit(getPlayerTurn());
+				return true;
 			}
 		} else if (!board.hasAllowedMoves(enemy)) {
 			OnPat.emit();
+			return true;
 		}
+		return false;
+	}
+
+	public boolean pawnShouldBePromoted() {
+		if (pawnShouldBePromoted(Color.White))
+			return true;
+		return pawnShouldBePromoted(Color.Black);
+	}
+
+	private boolean pawnShouldBePromoted(Color color) {
+		int enemyLineY = color == Color.White ? 0 : 7;
+
+		for (int x = 0; x < Coordinate.VALUE_MAX; x++) {
+			if(checkPromotion(new Coordinate(x, enemyLineY)))
+				return true;
+		}
+
+		return false;
 	}
 
 }