Update app.py

app.py

@@ -82,7 +82,7 @@ def parse_coordinate_list(board_str: str) -> List[List[str]]:
     into a 6x7 grid (list of lists) with row index 0 as the bottom.
     """
     grid = [['.' for _ in range(7)] for _ in range(6)]
-    if not board_str.strip():
+    if not board_str.strip() or board_str == "Empty Board":
         return grid
     coords = board_str.split(",")
     for coord in coords:
@@ -102,33 +102,21 @@ def parse_coordinate_list(board_str: str) -> List[List[str]]:
             grid[row][col] = piece
     return grid
 
-def get_available_positions(board_moves: List[str]) -> str:
-    """Returns the next available position (lowest empty spot) for each column."""
-    # Initialize empty grid (. means empty)
-    grid = [['.' for _ in range(7)] for _ in range(6)]
-    
-    # Fill in taken positions from the moves
-    for move in board_moves:
-        if len(move) >= 2:
-            col = ord(move[0]) - ord('a')
-            row = int(move[1]) - 1
-            if 0 <= row < 6 and 0 <= col < 7:
-                grid[row][col] = 'X' if len(board_moves) % 2 == 1 else 'O'
-    
-    # Find next available position in each column
+def get_available_positions(board: np.ndarray) -> str:
+    """
+    Returns the next available position (the lowest empty spot) for each column
+    directly from the board (a NumPy array). If a piece has been played at a1,
+    then the available spot in column a will be a2.
+    """
     available = []
     for col in range(7):
         col_letter = chr(ord('a') + col)
         # Search from bottom (row 0) to top (row 5)
-        next_pos = None
         for row in range(6):
-            if grid[row][col] == '.':  # Found empty spot
-                next_pos = f"{col_letter}{row + 1}"  # +1 because grid is 0-based
+            if board[row][col] == 0:  # Found empty spot
+                available.append(f"{col_letter}: {col_letter}{row + 1}")
                 break
-        if next_pos:  # Only add if column isn't full
-            available.append(f"{col_letter}: {next_pos}")
-    
-    return "\n  ".join(available)  # Format with newlines and indentation
+    return "\n  ".join(available)
 
 class ConnectFour:
     def __init__(self):