/// <summary>
/// Makes a move for the given player in the given board
/// </summary>
/// <param name="board">The board</param>
/// <param name="player">The player</param>
public BoardMove MakeMove(Board board, BoardTileType player)
{
var move = new BoardMove(-1, -1);
this.Minimax(player, board, player, out move);
return(move);
}
/// <summary>
/// Calculates the best move for the given player
/// </summary>
/// <param name="player">The player</param>
/// <param name="board">The board</param>
/// <param name="turnPlayer">The current player in the turn</param>
/// <param name="move">The move to make</param>
/// <returns>The score</returns>
private int Minimax(BoardTileType player, Board board, BoardTileType turnPlayer, out BoardMove move)
{
var winner = board.GetWinner();
if (winner != null)
{
move = new BoardMove(-1, -1);
return(this.Score(player, winner.Value));
}
var scores = new List <int>();
var moves = new List <BoardMove>();
//Go through all possible games from the current board
foreach (var possibleMove in board.GetMoves())
{
var possibleBoard = board.WithMove(possibleMove.X, possibleMove.Y, turnPlayer);
scores.Add(this.Minimax(player, possibleBoard, this.NextPlayer(turnPlayer), out move));
moves.Add(possibleMove);
}
if (player == turnPlayer)
{
//Max calculation
var maxIndex = FindBestIndex(scores, (x, y) => x > y);
move = moves[maxIndex];
return(scores[maxIndex]);
}
else
{
//Min calculation
var minIndex = FindBestIndex(scores, (x, y) => x < y);
move = moves[minIndex];
return(scores[minIndex]);
}
}
