public async Task Move(string moveNotation, string gameId)
{
_logger.LogInformation("Move {Move} sent in game {GameId}", moveNotation, gameId);
await Clients.Caller.SendAsync(GameHubOutgoingMessages.MOVE_RECEIVED);
var game = _gameRepository.GetGameById(gameId);
if (game == null)
{
return;
}
if (!game.Active)
{
_logger.LogInformation("Move {Move} was illegal in game {GameId} because game is inactive", moveNotation, gameId);
await Clients.Caller.SendAsync(GameHubOutgoingMessages.ILLEGAL_MOVE, game.Fen);
return;
}
var userIdString = Context.UserIdentifier;
if (userIdString == null)
{
_logger.LogInformation("Move {Move} was illegal in game {GameId} because user was not logged in", moveNotation, gameId);
await Clients.Caller.SendAsync(GameHubOutgoingMessages.ILLEGAL_MOVE, game.Fen);
return;
}
var parsedUserId = int.Parse(userIdString);
if (parsedUserId != game.WhitePlayerId && parsedUserId != game.BlackPlayerId)
{
_logger.LogInformation("Move {Move} was illegal in game {GameId} because user {userId} is not a player", moveNotation, gameId, parsedUserId);
await Clients.Caller.SendAsync(GameHubOutgoingMessages.ILLEGAL_MOVE, game.Fen);
return;
}
var moveValidationResult = _moveValidator.ValidateMove(game.Fen, moveNotation);
if (!moveValidationResult.IsValid)
{
_logger.LogInformation("Move {Move} was illegal in game {GameId}", moveNotation, gameId);
await Clients.Caller.SendAsync(GameHubOutgoingMessages.ILLEGAL_MOVE, game.Fen);
return;
}
var move = _coordinateNotationParser.ParseNotationMove(moveNotation);
var currentBoardState = _fenParser.ParseFen(game.Fen);
var newBoardState = _moveHandler.ApplyMove(currentBoardState, move, moveValidationResult);
_gameRepository.AddMoveToGame(gameId, moveNotation, newBoardState.Fen);
await Clients.Group($"{GAME_GROUP_PREFIX}{gameId}")
.SendAsync(GameHubOutgoingMessages.MOVE_PLAYED, moveNotation);
if (moveValidationResult.ShouldResetHalfmoveClock)
{
_gameRepository.ClearPositionsFromIrreversibleMove(gameId);
}
_gameRepository.AddPositionToGame(gameId, newBoardState.Fen);
var positionsSinceIrreversibleMove = _gameRepository.GetPositionsSinceIrreversibleMove(gameId);
if (_moveValidator.IsCheckmate(newBoardState))
{
var winner = currentBoardState.ActiveColor;
await EndGame(game, winner, GameConstants.CHECKMATE_TERMINATION, GameHubOutgoingMessages.CHECKMATE);
}
else if (_moveValidator.IsStalemate(newBoardState))
{
await EndGame(game, null, GameConstants.STALEMATE_TERMINATION, GameHubOutgoingMessages.DRAW);
}
else if (newBoardState.HalfmoveClock >= 100)
{
await EndGame(game, null, GameConstants.FIFTY_MOVE_RULE_TERMINATION, GameHubOutgoingMessages.DRAW);
}
else if (_moveValidator.IsThreefoldRepetition(newBoardState, positionsSinceIrreversibleMove))
{
await EndGame(game, null, GameConstants.THREEFOLD_REPETITION_TERMINATION, GameHubOutgoingMessages.DRAW);
}
}