completed the step useTouch()

OOP_group1A1_project/src/backend/Board.java

@@ -8,6 +8,13 @@ public class Board {
 	private int height;
 	private ArrayList<Piece> Pieces;
 	
+	// ── NEW FIELDS FOR userTouch ───────────────────────────────────────
+    private boolean hasSelection = false;   // did we already click to pick up a piece?
+    private int selectedX, selectedY;       // if so, which square is “in hand”?
+    private int turnNumber    = 0;          // how many half-moves have been played?
+    private boolean turnWhite = true;       // true = White to play, false = Black
+    // ─────────────────────────────────────────────────────────────
+	
 	public Board(int width, int height) {
 		this.width = width;
 		this.height = height;
@@ -24,12 +31,12 @@ public class Board {
 
 	public int getTurnNumber() {
 		//TODO
-		return 0;
+		return turnNumber;
 	}
 
 	public boolean isTurnWhite() {
 		//TODO
-		return false;
+		return turnWhite;
 	}
 
 	public void setPiece(boolean isWhite, PieceType type, int x, int y) {
@@ -126,14 +133,70 @@ public class Board {
         return sb.toString();
     }
 	
+    public void userTouch(int x, int y) {
+    	// 1) Find if you clicked on a piece at (x,y)
+    	Piece clicked = null;
+    	for (int i = 0; i < Pieces.size(); i++) {
+    		Piece p = Pieces.get(i);
+    		if (p.getX() == x && p.getY() == y) {
+    			// compare the piece coordinate to the square clicked coordinate  
+    			clicked = p;
+    			break;
+    		}
+    	}
+
+        // 2) If nothing is selected yet, select this piece (if any)
+        if (!hasSelection) {
+            if (clicked != null) {
+                hasSelection = true;
+                selectedX    = x;
+                selectedY    = y;
+            }
+            return;
+        }
+
+        // 3) If you click the same square twice → cancel selection
+        if (selectedX == x && selectedY == y) {
+            hasSelection = false;
+            return;
+        }
+
+        // 4) Otherwise, move the previously selected piece to (x,y):
+        //    a) remove any piece already on the destination (simple capture)
+        Pieces.removeIf(p -> p.getX() == x && p.getY() == y);
+        // remove p if p.getX() == x && p.getY() == y
+
+        //    b) locate the selected piece object
+        Piece toMove = null;
+        for (int i = 0; i < Pieces.size(); i++) {
+            Piece p = Pieces.get(i);
+            if (p.getX() == selectedX && p.getY() == selectedY) {
+                toMove = p;
+                break;
+            }
+        }
+
+
+        //    c) re-place it at the new coordinates
+        if (toMove != null) {
+            Pieces.remove(toMove);
+            // we need to remove it from its old place 
+            Pieces.add(new Piece(x, y, toMove.isWhite(), toMove.getType()));
+        }   // change the x y but still the same color and type 
+
+        // 5) Advance half-move counter and switch player
+        turnNumber++;
+        turnWhite = !turnWhite;
+
+        // 6) Clear the selection so you can pick again next turn
+        hasSelection = false;
+    }
 
-	public void userTouch(int x, int y) {
-		
-	}
 
 	public boolean isSelected(int x, int y) {
-		//TODO
+		// return true if the exact square is currently picked up
-		return false;
+		return hasSelection && selectedX == x && selectedY == y;
+		// hasSelection is true the moment the user clicks on a piece for the first time
 	}
 	
 	/* saving-loading feature :*/