// ToDo: Handle promotion of pawns
public override bool DidMove(
Player player, Player opponent, Location origin, Location destination)
{
// Can move up to 2 rows toward opponent on 1st move
bool isInitialMove = false;
var piece = player.Pieces.Find(p => p.CurrentLocation == origin);
if (piece.PreviousLocation == null)
{
isInitialMove = true;
}
int limit = 1;
if (isInitialMove)
{
limit = 2;
}
bool isLegalMoveThroughRows =
MoveAssistant.IsLegalMoveThroughRows(player, opponent, origin, destination, limit, false);
// If is capture, can move 1 square diagonally toward opponent
// ToDo: Handle case of en passant capture!!!
bool isCapture = MoveAssistant.IsCapture(opponent, destination);
bool isLegalMoveDiagonally = false;
if (isCapture)
{
isLegalMoveDiagonally =
MoveAssistant.IsLegalMoveDiagonally(player, opponent, origin, destination, 1, false);
}
// If legal through rows or diagonally, return True
if (isLegalMoveThroughRows || isLegalMoveDiagonally)
{
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Tries to execute the move.
/// </summary>
/// <param name="playerIndex">Index of player making the move.</param>
/// <param name="origin">The origin Location</param>
/// <param name="destination">The destination Location</param>
/// <param name="message">Either an empty string or a message containing UI feedback.</param>
/// <returns>True, if successful; else false</returns>
internal bool DidExecuteMove(
int playerIndex, Location origin, Location destination, out string message)
{
int otherPlayerIndex = GetOtherPlayerIndex(playerIndex);
Player player = Players[playerIndex];
Player opponent = Players[otherPlayerIndex];
ChessPiece piece = Players[playerIndex].Pieces
.SingleOrDefault(p => p.CurrentLocation.Coordinate == origin.Coordinate);
if (DidMovePiece(player, opponent, origin, destination, piece))
{
// Update state of captured piece
bool isCaptured = MoveAssistant.IsCapture(opponent, destination);
if (isCaptured)
{
ChessPiece capturedPiece =
opponent.Pieces.SingleOrDefault(p => p.CurrentLocation == destination);
capturedPiece.PreviousLocation = capturedPiece.CurrentLocation;
capturedPiece.CurrentLocation = null;
capturedPiece.IsCaptured = true;
if (player.CapturedPieces == null)
{
player.CapturedPieces = new List <ChessPiece>();
}
player.CapturedPieces.Add(capturedPiece);
opponent.Pieces.Remove(capturedPiece);
}
piece.PreviousLocation = piece.CurrentLocation;
piece.CurrentLocation = destination;
message = $"Moved {piece.Text} from {piece.PreviousLocation.Coordinate} to {piece.CurrentLocation.Coordinate}";
return(true);
}
else
{
message = "Your move is not legal. Please try a different move.";
}
return(false);
}