/// <summary>
/// Reverts the <see cref="Game"/> back to the <see cref="LastMove"/>'s state.
/// </summary>
public void Undo()
{
if (!CanUndo)
{
return;
}
Tile removedTile = _history.Pop();
BoardChanging?.Invoke(
this,
new BoardChangingEventArgs(
new Tile[0],
new Tile[] { removedTile }));
removedTile.Piece = new Piece(Pieces.None);
Manager.Turn.MoveBack();
if (IsOver)
{
IsOver = false;
Manager.Turn.ShiftStartBackwards();
}
BoardChanged?.Invoke(
this,
new BoardChangedEventArgs(
new Tile[0],
new Tile[] { removedTile }));
}
/// <summary>
/// Resets the <see cref="Game"/> to its original state.
/// </summary>
public void Restart()
{
Tile[] history = _history.ToArray();
BoardChanging?.Invoke(
this,
new BoardChangingEventArgs(
new Tile[0],
history));
foreach (Tile tile in _history)
{
tile.Piece = new Piece(Pieces.None);
}
Manager.Turn.Reset();
_history.Clear();
IsOver = false;
BoardChanged?.Invoke(
this,
new BoardChangedEventArgs(
new Tile[0],
history));
}
/// <summary>
/// Puts a <see cref="Tile"/> corresponding to <see cref="CurrentPlayer"/>
/// and advances the <see cref="Game"/> to the next state. at position
/// <paramref name="x"/>, <paramref name="y"/>.
/// </summary>
/// <param name="x">x-axis position</param>
/// <param name="y">y-axis position</param>
/// <exception cref="ArgumentException"></exception>
public void Play(int x, int y)
{
if (x < 0 || x > Board.Width)
{
throw new ArgumentException("Value is out of range", nameof(x));
}
if (y < 0 || y > Board.Height)
{
throw new ArgumentException("Value is out of range", nameof(y));
}
// Check if game is over
if (IsOver)
{
return;
}
Tile tile = Board[x, y];
// Check for already placed tile
if (tile.Piece.Type != Pieces.None)
{
return;
}
Player oldPlayer = Manager.CurrentPlayer;
tile.Piece = oldPlayer.Piece;
Tile previousTile = LastMove;
_history.Push(tile);
BoardChanging?.Invoke(
this,
new BoardChangingEventArgs(
new Tile[] { tile },
new Tile[0]));
// Check for game over
if (CheckGameOver(x, y, out IList <Tile> winningLine))
{
IsOver = true;
if (ShiftPlayersOnGameOver)
{
Manager.Turn.ShiftStartForwards();
}
}
// Increment turn
Manager.Turn.MoveNext();
BoardChanged?.Invoke(
this,
new BoardChangedEventArgs(
new Tile[] { tile },
new Tile[0]));
if (IsOver)
{
GameOver?.Invoke(
this,
new GameOverEventArgs(
Manager.Turn.Current,
oldPlayer,
winningLine));
}
}