#pragma once
#include <stdint.h>
#include <stdbool.h>

#define FILE_A 0x0101010101010101ULL
#define FILE_B 0x0202020202020202ULL
#define FILE_C 0x0404040404040404ULL
#define FILE_D 0x0808080808080808ULL
#define FILE_E 0x1010101010101010ULL
#define FILE_F 0x2020202020202020ULL
#define FILE_G 0x4040404040404040ULL
#define FILE_H 0x8080808080808080ULL

#define RANK_1 0x00000000000000FFULL
#define RANK_2 0x000000000000FF00ULL
#define RANK_3 0x0000000000FF0000ULL
#define RANK_4 0x00000000FF000000ULL
#define RANK_5 0x000000FF00000000ULL
#define RANK_6 0x0000FF0000000000ULL
#define RANK_7 0x00FF000000000000ULL
#define RANK_8 0xFF00000000000000ULL

enum Color { WHITE = 0, BLACK = 1 };
enum Piece { PAWN, KNIGHT, BISHOP, ROOK, QUEEN, KING, PIECE_N = 6 };

enum Castling {
    CASTLE_WK = 1 << 0,
    CASTLE_WQ = 1 << 1,
    CASTLE_BK = 1 << 2,
    CASTLE_BQ = 1 << 3
};

struct Board {
    uint64_t bb[2][PIECE_N];    // Each set of pieces get a bitboard for each player.
    uint64_t occ[2];            // Color occupancy bitboards.
    uint64_t occ_both;          // occ[WHITE] | occ[BLACK]

    uint64_t king_square[2];

    uint8_t castling;
    uint64_t ep_square;
    enum Color side_to_move;

    uint16_t halfmove_clock;
    uint16_t fullmove_number;
};

void create_knight_attack_cache(void);
void create_pawn_attack_cache(void);
void create_king_attack_cache(void);