protected override void AfterMove()
{
TicTacToeMove lastMove = (TicTacToeMove)this.moves[this.moves.Length - 1];
this.winner = this.GetWinner(lastMove);
this.isOver = this.winner != null || !this.MovesLeft(lastMove);
this.currentPlayerIndex = ++this.currentPlayerIndex % 2;
}
protected GamePlayer GetWinner(TicTacToeMove state)
{
int[] colSums = new int[3];
int[] rowSums = new int[3];
int diagSum1 = 0;
int diagSum2 = 0;
GamePlayer winner = null;
for (int r = 0; r < state.Board.Length; r++)
{
ImmutableArray <string> row = state.Board[r];
for (int c = 0; c < row.Length; c++)
{
string currentPlayerId = row[c];
if (String.IsNullOrWhiteSpace(currentPlayerId))
{
continue;
}
int currentPlayerNum = playerToNumberMap[currentPlayerId];
rowSums[r] += currentPlayerNum;
if ((winner = CheckScore(rowSums[r])) != null)
{
return(winner);
}
colSums[c] += currentPlayerNum;
if ((winner = CheckScore(colSums[c])) != null)
{
return(winner);
}
if (r == c)
{
diagSum1 += currentPlayerNum;
if ((winner = CheckScore(diagSum1)) != null)
{
return(winner);
}
}
if (r + c == row.Length - 1)
{
diagSum2 += currentPlayerNum;
if ((winner = CheckScore(diagSum2)) != null)
{
return(winner);
}
}
}
}
return(null);
}
protected override bool ValidateMove(IGameState game, IGameMove move)
{
TicTacToeMove typedMove = (TicTacToeMove)move;
string expectedPlayerId = this.CurrentPlayer.Id;
string actualPlayerId = typedMove.PlayerId;
if (actualPlayerId != expectedPlayerId)
{
throw new Exception($"Move was made by the wrong player. Expected {expectedPlayerId}, received {actualPlayerId}.");
}
return(true);
// TODO: proper validation;
}
protected bool MovesLeft(TicTacToeMove state)
{
for (int r = 0; r < state.Board.Length; r++)
{
ImmutableArray <string> row = state.Board[r];
for (int c = 0; c < row.Length; c++)
{
if (String.IsNullOrWhiteSpace(row[c]))
{
return(true);
}
}
}
return(false);
}
public TicTacToeGame(GamePlayer[] players)
{
if (players.Length != 2)
{
throw new ArgumentOutOfRangeException(nameof(players), "Tic Tac Toe requires exactly 2 players");
}
if (players[0].Id == players[1].Id)
{
throw new ArgumentException(nameof(players), "Players cannot have the same Id");
}
this.players = players.ToImmutableArray();
playerToNumberMap = new Dictionary <string, int> {
{ players[0].Id, -1 },
{ players[1].Id, 1 }
}
.ToImmutableDictionary();
TicTacToeMove move = new TicTacToeMove();
this.moves = ImmutableArray.Create((IGameMove)move);
}