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#include "board.hpp"
#include "zobrist.hpp"
#include <cassert>
#include <string>
Piece createPiece(PieceType type, bool color, bool moved) {
Piece piece;
piece.type = type;
piece.color = color;
piece.moved = moved;
return piece;
}
int PositionToIndex(Position i) { return i.rank * 8 + i.file; }
UndoMove MakeMove(Move move, Game *g) {
UndoMove undo = {};
undo.from = move.From;
undo.to = move.To;
undo.movedPiece = g->pieces[PositionToIndex(move.From)];
undo.capturedPiece = g->pieces[PositionToIndex(move.To)];
undo.oldTurn = g->turn;
undo.oldCanEnpassant = g->canEnpassant;
undo.oldEnPassant = g->enPassant;
undo.oldHalfMoveClock = g->halfMoveClock;
undo.oldMoveClock = g->MoveClock;
undo.oldState = g->state;
undo.oldCaslte = g->castle;
// play move
Piece piece = g->pieces[PositionToIndex(move.From)];
Piece piece2 = g->pieces[PositionToIndex(move.To)];
if (piece2.type != NONEPIECE) {
if (piece2.color == g->turn) {
assert(false && "capturing friendly piece error");
}
}
piece.moved = true;
// clock
g->MoveClock++;
if (piece.type == PAWN || piece2.type != NONEPIECE) {
g->halfMoveClock = 0;
} else {
g->halfMoveClock++;
}
// Playing enpasstant
if (piece.type == PAWN && g->canEnpassant && move.To == g->enPassant) {
Position capturedPawn = move.To;
capturedPawn.rank += piece.color ? 1 : -1;
g->pieces[PositionToIndex(capturedPawn)] = {false, NONEPIECE, false};
undo.wasEnPassantCapture = true;
undo.enPassantCapturedSquare = capturedPawn;
undo.enPassantCapturedPiece = g->pieces[PositionToIndex(capturedPawn)];
}
g->canEnpassant = false;
// Adding enpassant
if (piece.type == PAWN) {
Position to = move.To;
to.rank -= (piece.color ? -2 : 2);
if (to == move.From) {
g->canEnpassant = true;
Position target = move.From;
target.rank += piece.color ? -1 : 1;
g->enPassant = target;
};
}
// Promotions
if (piece.type == PAWN && move.To.rank == (piece.color ? 0 : 7)) {
// TODO parse the promote type from uci isntead of ignoreting it
piece.type = move.promotion == NONEPIECE ? QUEEN : move.promotion;
}
assert(g->castle != "");
// caslte
if (piece.type == KING && move.From.rank == (piece.color ? 0 : 7) &&
g->castle != "-" &&
(move.From.file + 2 == move.To.file ||
move.From.file - 2 == move.To.file)) {
bool caslteSide =
(move.From.file > move.To.file); // 0 queen side, 1 king side
char castleCharacter =
(caslteSide ? (piece.color ? 'K' : 'k') : (piece.color ? 'Q' : 'q'));
std::string newCastleString = "";
if (g->castle.contains('Q') && 'Q' != castleCharacter) {
newCastleString += 'Q';
};
if (g->castle.contains('K') && 'K' != castleCharacter) {
newCastleString += 'K';
};
if (g->castle.contains('q') && 'q' != castleCharacter) {
newCastleString += 'q';
};
if (g->castle.contains('k') && 'k' != castleCharacter) {
newCastleString += 'k';
};
if (newCastleString == "") {
newCastleString = "-";
};
g->castle = newCastleString;
if (move.From.file + 2 == move.To.file) {
Position rook_pos = move.To;
rook_pos.file += 1;
Piece rook = g->pieces[PositionToIndex(rook_pos)];
g->pieces[PositionToIndex(rook_pos)] = {false, NONEPIECE, false};
rook.moved = true;
rook_pos = move.From;
rook_pos.file -= 1;
g->pieces[PositionToIndex(rook_pos)] = rook;
}
if (move.From.file - 2 == move.To.file) {
Position rook_pos = move.To;
rook_pos.file -= 1;
Piece rook = g->pieces[PositionToIndex(rook_pos)];
g->pieces[PositionToIndex(rook_pos)] = {false, NONEPIECE, false};
rook.moved = true;
rook_pos = move.From;
rook_pos.file += 1;
g->pieces[PositionToIndex(rook_pos)] = rook;
}
};
// setting the moves
g->pieces[PositionToIndex(move.To)] = piece;
g->pieces[PositionToIndex(move.From)] = {false, NONEPIECE, false};
// changing who turn it is
g->turn = !g->turn;
// 3 fold check
uint64_t key = GenerateZobristKey(g);
undo.zobristKey = key;
g->ThreeFoldMap[key]++;
if (g->ThreeFoldMap[key] >= 3) {
g->state = DRAW;
}
if (g->halfMoveClock >= 50) {
g->state = DRAW;
}
return undo;
};
void UnMakeMove(UndoMove undo, Game *g) {
g->pieces[PositionToIndex(undo.from)] = undo.movedPiece;
g->pieces[PositionToIndex(undo.to)] = undo.capturedPiece;
if (undo.wasEnPassantCapture) {
g->pieces[PositionToIndex(undo.enPassantCapturedSquare)] =
undo.enPassantCapturedPiece;
}
g->turn = undo.oldTurn;
g->canEnpassant = undo.oldCanEnpassant;
g->enPassant = undo.oldEnPassant;
g->halfMoveClock = undo.oldHalfMoveClock;
g->MoveClock = undo.oldMoveClock;
g->state = undo.oldState;
g->castle = undo.oldCaslte;
if (--g->ThreeFoldMap[undo.zobristKey] <= 0) {
g->ThreeFoldMap.erase(undo.zobristKey);
}
};
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