public async Task<ActionResult> MakeMove(Guid id, int x, int y)
{
var guid = GetGuid();
var game = GameGrainFactory.GetGrain(id);
var move = new GameMove { PlayerId = guid, X = x, Y = y };
var state = await game.MakeMove(move);
return Json(state, JsonRequestBehavior.AllowGet);
}
// make a move during the game
public async Task<GameState> MakeMove(GameMove move)
{
// check if its a legal move to make
if (this.GameState != GameState.InPlay) throw new ApplicationException("This game is not in play");
if (ListOfPlayers.IndexOf(move.PlayerId) < 0) throw new ArgumentException("No such playerid for this game", "move");
if (move.PlayerId != ListOfPlayers[indexNextPlayerToMove]) throw new ArgumentException("The wrong player tried to make a move", "move");
if (move.X < 0 || move.X > 2 || move.Y < 0 || move.Y > 2) throw new ArgumentException("Bad co-ordinates for a move", "move");
if (theBoard[move.X, move.Y] != -1) throw new ArgumentException("That square is not empty", "move");
// record move
this.ListOfMoves.Add(move);
this.theBoard[move.X, move.Y] = indexNextPlayerToMove;
// check for a winning move
var win = false;
if (!win)
for (int i = 0; i < 3 && !win; i++)
win = isWinningLine(theBoard[i, 0], theBoard[i, 1], theBoard[i, 2]);
if (!win)
for (int i = 0; i < 3 && !win; i++)
win = isWinningLine(theBoard[0, i], theBoard[1, i], theBoard[2, i]);
if (!win)
win = isWinningLine(theBoard[0, 0], theBoard[1, 1], theBoard[2, 2]);
if (!win)
win = isWinningLine(theBoard[0, 2], theBoard[1, 1], theBoard[2, 0]);
// check for draw
var draw = false;
if (this.ListOfMoves.Count() == 9)
draw = true; // we could try to look for stalemate earlier, if we wanted
// handle end of game
if (win || draw)
{
// game over
this.GameState = GameState.Finished;
if (win)
{
WinnerId = ListOfPlayers[indexNextPlayerToMove];
LoserId = ListOfPlayers[(indexNextPlayerToMove + 1) % 2];
}
// collect tasks up, so we await both notifications at the same time
var promises = new List<Task>();
// inform this player of outcome
var playerGrain = PlayerGrainFactory.GetGrain(ListOfPlayers[indexNextPlayerToMove]);
promises.Add(playerGrain.LeaveGame(this.GetPrimaryKey(), win ? GameOutcome.Win : GameOutcome.Draw));
// inform other player of outcome
playerGrain = PlayerGrainFactory.GetGrain(ListOfPlayers[(indexNextPlayerToMove + 1) % 2]);
promises.Add(playerGrain.LeaveGame(this.GetPrimaryKey(), win ? GameOutcome.Lose : GameOutcome.Draw));
await Task.WhenAll(promises);
return this.GameState;
}
// if game hasnt ended, prepare for next players move
indexNextPlayerToMove = (indexNextPlayerToMove + 1) % 2;
return this.GameState;
}
