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#include "fen.hpp"
#include "board.hpp"
#include <cassert>
#include <cctype>
#include <cstdint>
#include <cstdlib>
#include <print>
#include <string>
#include <sys/types.h>
bool WHITE = true;
bool BLACK = false;
void setBoardFen(const std::string fen, Game *g) {
// example fen rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
int file = 0;
int rank = 0;
Position enpassant = {};
enum parserState {
BOARD,
PLAYER_TO_MOVE,
CASTLE,
ENPASSANT,
HALF_MOVE_CLOCK,
FULL_MOVE_CLOCK,
};
parserState parser_state = BOARD;
for (uint i = 0; i < fen.length(); i++) {
char c = fen[i];
if (c == ' ') {
if (parser_state == BOARD) {
parser_state = PLAYER_TO_MOVE;
continue;
}
if (parser_state == PLAYER_TO_MOVE) {
parser_state = CASTLE;
continue;
}
if (parser_state == CASTLE) {
parser_state = ENPASSANT;
continue;
}
if (parser_state == ENPASSANT) {
parser_state = HALF_MOVE_CLOCK;
continue;
}
if (parser_state == HALF_MOVE_CLOCK) {
parser_state = FULL_MOVE_CLOCK;
continue;
}
}
if (parser_state == ENPASSANT) {
if (toupper(c) >= 'A' && toupper(c) <= 'H') {
enpassant.file = static_cast<uint8_t>(toupper(c) - 'A');
g->canEnpassant = true;
}
if (c >= '1' && c <= '8') {
enpassant.rank = static_cast<uint8_t>(c - '0');
g->canEnpassant = true;
}
continue;
}
if (parser_state == CASTLE) {
if (c == '-') {
g->blackCastleKing = false;
g->blackCastleQueen = false;
g->whiteCastleKing = false;
g->whiteCastleQueen = false;
continue;
}
if (c == 'K') {
g->whiteCastleKing = true;
continue;
}
if (c == 'Q') {
g->whiteCastleQueen = true;
continue;
}
if (c == 'k') {
g->blackCastleKing = true;
continue;
}
if (c == 'q') {
g->blackCastleQueen = true;
continue;
}
}
if (parser_state == PLAYER_TO_MOVE) {
if (toupper(c) == 'W') {
g->turn = WHITE;
continue;
}
if (toupper(c) == 'B') {
g->turn = BLACK;
continue;
}
}
if (parser_state == BOARD) {
if (isdigit(c)) {
int move = c - '0';
file += move;
if (file > 8) {
std::println("Fatal: file was to big");
assert(false && "Malformed file");
exit(1);
return; // malformed file
}
continue;
}
if (c == '/') {
file = 0;
rank++;
if (rank >= 8) {
std::println("Fatal: rank was to big");
assert(false && "Malformed rank");
exit(1);
return; // malformed rank
}
continue;
};
if (toupper(c) == 'N') {
SetPiece(rank * 8 + file, KNIGHT, isupper(c), g);
file++;
continue;
};
if (toupper(c) == 'R') {
SetPiece(rank * 8 + file, ROOK, isupper(c), g);
file++;
continue;
}
if (toupper(c) == 'Q') {
SetPiece(rank * 8 + file, QUEEN, isupper(c), g);
file++;
continue;
}
if (toupper(c) == 'B') {
SetPiece(rank * 8 + file, BISHOP, isupper(c), g);
file++;
continue;
}
if (toupper(c) == 'P') {
SetPiece(rank * 8 + file, PAWN, isupper(c), g);
file++;
continue;
}
if (toupper(c) == 'K') {
SetPiece(rank * 8 + file, KING, isupper(c), g);
file++;
continue;
}
}
break;
}
g->enPassant = enpassant;
UpdateBitboards(g);
}
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