#ifndef BITBOARD_H
#define BITBOARD_H

#include "ints.h"

typedef u64 bitboard_t;

enum {
  WHITE_KING,
  WHITE_QUEEN,
  WHITE_ROOK,
  WHITE_BISHOP,
  WHITE_KNIGHT,
  WHITE_PAWN,
  BLACK_KING,
  BLACK_QUEEN,
  BLACK_ROOK,
  BLACK_BISHOP,
  BLACK_KNIGHT,
  BLACK_PAWN,
  PIECE_TYPE_COUNT,
};

enum {
  WHITE_SHORT_CASTLE,
  WHITE_LONG_CASTLE,
  BLACK_SHORT_CASTLE,
  BLACK_LONG_CASTLE,
};

enum {
  WHITE_TURN,
  BLACK_TURN,
};

#define BITMASK_RANK_A 255ULL
#define BITMASK_RANK_B 65280ULL
#define BITMASK_RANK_C 16711680ULL
#define BITMASK_RANK_D 4278190080ULL
#define BITMASK_RANK_E 1095216660480ULL
#define BITMASK_RANK_F 280375465082880ULL
#define BITMASK_RANK_G 71776119061217280ULL
#define BITMASK_RANK_H 18374686479671623680ULL
#define BITMASK_COLM_1 72340172838076673ULL
#define BITMASK_COLM_2 144680345676153346ULL
#define BITMASK_COLM_3 289360691352306692ULL
#define BITMASK_COLM_4 578721382704613384ULL
#define BITMASK_COLM_5 1157442765409226768ULL
#define BITMASK_COLM_6 2314885530818453536ULL
#define BITMASK_COLM_7 4629771061636907072ULL
#define BITMASK_COLM_8 9259542123273814144ULL

typedef struct {
  bitboard_t bitboards[PIECE_TYPE_COUNT];
  u8 castling;
  u8 turn;
  u8 passantable_column;
} position_t;

position_t position_starting();
void assert_valid_position(position_t position);
bitboard_t whites(position_t position);
bitboard_t blacks(position_t position);

void print_bitboard(bitboard_t bitboard);

#endif // !BITBOARD_H