/// <summary>
/// Finds out what row the coordinates are in with a reversed perspective
/// </summary>
/// <param name="coords"></param>
/// <param name="reversed"></param>
/// <returns></returns>
public static int Column(this Coords coords, bool reversed)
{
if (reversed)
{
return(7 - coords.Column());
}
return(coords.Column());
}
/// <summary>
/// Reusable method for calculating valid position within the board
/// </summary>
/// <param name="board"></param>
/// <param name="corner"></param>
/// <param name="op"></param>
/// <param name="xRay"></param>
/// <param name="updateBlockingPieces"></param>
/// <returns></returns>
private List <Coords> HandleCoords(Tile[] board, int corner, Func <int, int, int> op, bool xRay, bool updateBlockingPieces)
{
List <Coords> coordsList = new List <Coords>();
bool finished = false;
int rotation = 1;
while (!finished)
{
Coords coordinate = (Coords)op((int)Coords, rotation);
if (!ValidCoordinate(board, coordinate, corner, true))
{
break;
}
if (board[(int)coordinate].Piece?.Side == Side)
{
if (!xRay)
{
break;
}
finished = true;
}
if (board.HasPawnOnTile(coordinate) && board[(int)coordinate].Piece.Side != Side)
{
if (updateBlockingPieces)
{
if (coordinate.Column() != corner)
{
HandleBlocking(board, board[(int)coordinate].Piece, op, corner, rotation + 1);
}
HandleTargetKing(board, op, corner, rotation);
}
finished = true;
}
coordsList.Add(coordinate);
if (coordinate.Column() == corner)
{
finished = true;
}
rotation++;
}
return(FilterKingProtectionCoords(coordsList));
}
/// <summary>
/// Finds out if coordinate tile is white
/// </summary>
/// <param name="coords"></param>
/// <returns></returns>
public static bool IsWhiteTile(this Coords coords)
{
bool reverseTile = coords.Row() % 2 != 0;
bool whiteTile = coords.Column() % 2 == 0;
return(reverseTile ? !whiteTile : whiteTile);
}
/// <summary>
/// Unique move for castling
/// </summary>
/// <param name="fromCoords"></param>
/// <param name="newCoords"></param>
/// <returns>returns false if castling was not activated</returns>
private bool MoveCastling(Coords fromCoords, Coords newCoords)
{
Tile kingTile = Board.Tiles[(int) fromCoords];
if (kingTile.Piece.EPiece != EPiece.King || ((King)kingTile.Piece).HasMoved)
return false;
int fixRookCoords = newCoords.Column() == 5 ? 2 : -1;
Tile rookTile = Board.Tiles[(int) newCoords + fixRookCoords];
if (kingTile.Piece?.EPiece != EPiece.King || rookTile.Piece?.EPiece != EPiece.Rook || kingTile.Piece?.Side != rookTile.Piece?.Side)
return false;
if (rookTile.Coords.Column() == 7)
{
//Rook
Board.Tiles[(int) rookTile.Coords - 3].Piece = rookTile.Piece;
rookTile.Piece.Move(rookTile.Coords - 3);
//King
Board.Tiles[(int) kingTile.Coords + 2].Piece = kingTile.Piece;
kingTile.Piece.Move(kingTile.Coords + 2);
//Update
Board.Tiles[(int) fromCoords].Piece = null;
Board.Tiles[(int) newCoords + fixRookCoords].Piece = null;
OnPieceMoved(rookTile.Piece, rookTile.Coords, rookTile.Coords - 3);
OnPieceMoved(kingTile.Piece, kingTile.Coords, kingTile.Coords + 2);
}
else
{
//Rook
Board.Tiles[(int) rookTile.Coords + 2].Piece = rookTile.Piece;
rookTile.Piece.Move(rookTile.Coords + 2);
OnPieceMoved(rookTile.Piece, rookTile.Coords, rookTile.Coords + 2);
//King
Board.Tiles[(int) kingTile.Coords - 2].Piece = kingTile.Piece;
kingTile.Piece.Move(kingTile.Coords - 2);
OnPieceMoved(kingTile.Piece, kingTile.Coords, kingTile.Coords - 2);
//Update
Board.Tiles[(int) fromCoords].Piece = null;
Board.Tiles[(int) newCoords + fixRookCoords].Piece = null;
OnPieceMoved(rookTile.Piece, rookTile.Coords, rookTile.Coords + 2);
OnPieceMoved(kingTile.Piece, kingTile.Coords, kingTile.Coords - 2);
}
UpdateGameCycle();
return true;
}
/// <summary>
/// General Check if a given coordinate is valid
/// </summary>
/// <param name="board"></param>
/// <param name="coords"></param>
/// <param name="sideCorner"></param>
/// <param name="ignoreOwnPiece">Ignores the check that you can't take over your own pieces</param>
/// <returns></returns>
protected bool ValidCoordinate(Tile[] board, Coords coords, int sideCorner, bool ignoreOwnPiece = false)
{
if (!coords.IsInsideBoard())
{
return(false);
}
if (sideCorner != -1 && Coords.Column() == sideCorner)
{
return(false);
}
if (!ignoreOwnPiece && board.HasPawnOnTile(coords) && board[(int)coords].Piece.Side == Side && board[(int)coords].Piece != this)
{
return(false);
}
return(true);
}
/// <summary>
/// Calculates the attack line of sight to the target
/// Ghost targets are still able to attack when moved but can't be blocked by other pieces
/// Attack line includes attacking pieces coords
/// </summary>
/// <param name="board"></param>
/// <param name="op"></param>
/// <param name="rotation"></param>
/// <param name="corner"></param>
/// <returns></returns>
private List <AttackCoord> GetAttackLine(Tile[] board, Func <int, int, int> op, int rotation, int corner)
{
List <AttackCoord> attackList = new List <AttackCoord>();
bool finished = false;
bool outOfBounds = false;
bool isAttackBlockable = false;
while (!finished)
{
Coords coordinate = (Coords)op((int)Coords, rotation);
if (!ValidCoordinate(board, coordinate, corner) || coordinate.Column() == corner)
{
outOfBounds = true;
rotation--;
continue;
}
if (board.HasPawnOnTile(coordinate))
{
if (outOfBounds && board[(int)coordinate].Piece.EPiece == EPiece.King)
{
isAttackBlockable = true;
}
if (board[(int)coordinate].Piece == this)
{
finished = true;
}
}
attackList.Add(new AttackCoord(coordinate, isAttackBlockable));
rotation = outOfBounds ? rotation - 1 : rotation + 1;
}
return(attackList.Distinct().ToList());
}
