added turn tracking variables, updated constructor, getTurnNumber,

isTurnWhite, userTouch updated

src/backend/Board.java

@@ -13,11 +13,15 @@ public class Board {
 	private ArrayList<Piece> pieces;
 	private int selectedX = -1; // Tracks selected column (-1 = no selection)
 	private int selectedY = -1; // Tracks selected row (-1 = no selection)
+	private int turnNumber = 0; // Starts at 0 (White's turn)
+	private boolean isWhiteTurn = true; // Track current player's turn
 
 	public Board(int colNum, int lineNum) {
 		this.colNum = colNum;
 	    this.lineNum = lineNum;
 	    this.pieces = new ArrayList<>();
+	    this.turnNumber = 0; // Initialize turn number
+	    this.isWhiteTurn = true; // White starts first
 		
 	}
 
@@ -32,13 +36,11 @@ public class Board {
 	}
 
 	public int getTurnNumber() {
-		//TODO
-		return 0;
+		return turnNumber;
 	}
 
 	public boolean isTurnWhite() {
-		//TODO
-		return false;
+	    return isWhiteTurn;
 	}
 
 	public void setPiece(boolean isWhite, PieceType type, int x, int y) {
@@ -143,37 +145,47 @@ public class Board {
 	}
 
 	public void userTouch(int x, int y) {
-		if (selectedX == -1) {
-	        // No current selection: Check if there's a piece at (x, y)
+		if (selectedX == -1) {  // No current selection
+	        // Check if there's a piece at the clicked position
 	        for (Piece p : pieces) {
 	            if (p.getX() == x && p.getY() == y) {
+	                // Only allow selection if it's the correct player's turn
+	                if (p.isWhite() == isWhiteTurn) {
 	                    selectedX = x;
 	                    selectedY = y;
+	                }
 	                return;
 	            }
 	        }
-	    } else {
-	        // Already selected: Move or unselect
-	        if (x == selectedX && y == selectedY) {
-	            // Unselect
+	    } else {  // Already have a selected piece
+	        if (x == selectedX && y == selectedY) {  // Clicked same position: unselect
 	            selectedX = -1;
 	            selectedY = -1;
-	        } else {
-	            // Move piece from (selectedX, selectedY) to (x, y)
+	        } else {  // Attempt to move
 	            Piece pieceToMove = null;
+	            
+	            // Find the selected piece
 	            for (Piece p : pieces) {
 	                if (p.getX() == selectedX && p.getY() == selectedY) {
 	                    pieceToMove = p;
 	                    break;
 	                }
 	            }
+
 	            if (pieceToMove != null) {
-	                // Remove target piece and move
+	                // Remove any piece at target location
 	                pieces.removeIf(p -> p.getX() == x && p.getY() == y);
+	                
+	                // Update piece position
 	                pieceToMove.setX(x);
 	                pieceToMove.setY(y);
+	                
+	                // Advance game state
+	                turnNumber++;
+	                isWhiteTurn = !isWhiteTurn;
 	            }
-	            // Unselect after move
+	            
+	            // Clear selection regardless of move success
 	            selectedX = -1;
 	            selectedY = -1;
 	        }