public async Task <GameNotification> SendGameActionAsync(GameActionRequest actionRequest)
{
GameState gameState = serverState.GetGameState(actionRequest.GameId);
if (!gameLogic.ValidateGameAction(actionRequest, gameState))
{
// TODO: make error messages clearer
throw new ArgumentException("Invalid move");
}
GameState newState = gameLogic.ApplyAction(gameState, actionRequest.Action);
Player player = GameLogicUtils.GetCurrentPlayer(newState);
if (player.Type == PlayerType.COMPUTER)
{
if (newState.Stage == GameStage.GAME_OVER)
{
return(new GameNotification {
NewGameState = newState
});
}
// Get computer's move and return new state to player
GameAction computerAction = gameAI.CalculateComputerMove(newState.BoardState, newState.Difficulty);
GameState afterComputerMove = gameLogic.ApplyAction(newState, computerAction);
serverState.UpdateGameState(afterComputerMove);
return(new GameNotification {
LastAction = computerAction,
NewGameState = afterComputerMove
});
}
else
{
serverState.UpdateGameState(newState);
// Notify opponent
var notification = new GameNotification
{
NewGameState = newState,
LastAction = actionRequest.Action
};
await Clients.Client(player.Id).ReceiveGameStateUpdate(notification).ConfigureAwait(false);
return(notification);
}
}
public GameAction CalculateComputerMove(GameBoardState gameState, GameDifficulty difficulty)
{
int maxDepth = ToRecursiveDepth(difficulty);
PlayerTurn maxTurn = gameState.CurrentTurn;
List <GameAction> possibleActions = GameLogicUtils.GetAllAvailableActions(gameState);
int maxEvaluation = int.MinValue;
GameAction bestMove = null;
foreach (GameAction action in possibleActions)
{
GameBoardState afterMove = gameLogic.ApplyAction(gameState, action);
int afterMoveEvaluation = Evaluate(afterMove, maxTurn, 0, maxDepth);
if (afterMoveEvaluation > maxEvaluation || (afterMoveEvaluation >= maxEvaluation && bestMove == null))
{
maxEvaluation = afterMoveEvaluation;
bestMove = action;
}
}
return(bestMove);
}