#ifndef BITWISE_H
#define BITWISE_H

#include "constants.h"
#include <vector>

// Using macros for ease of use, can also use functons, but I don't see the point.

/*
 * From (Position): 7 bits (2^7 == 128) possibilities
 * To (Position): same as above
 * Captured piece, if any: 4 bits (16) possibilities
 * Promoted to, if any: 4 bits (16) possibilities
 * en passant flag: 1 bit
 * pawn starting move flag: 1 bit
 * castle move flag: 1 bit
 *
 *	0000 0000 0000 0000 0000 0111 1111 -> From square position (& 0x7F)
 *	0000 0000 0000 0011 1111 1000 0000 -> To square position (>> 7 & 0x7F)
 *	0000 0000 0011 1100 0000 0000 0000 -> captured piece, if any (>> 14 & 0xF)
 *	0000 0011 1100 0000 0000 0000 0000 -> if prmoted, what to? (>> 18 & 0xF)
 *	0000 0100 0000 0000 0000 0000 0000 -> en passant (& 0x400000)
 *	0000 1000 0000 0000 0000 0000 0000 -> pawn starting move (& 0x800000)
 *	0001 0000 0000 0000 0000 0000 0000 -> castle move (& 0x1000000)
 * */

/* OLD, DO NOT USE
#define FROMSQ(m) ((m)     & 0x3f)
#define TOSQ(m)   ((m>>6)  & 0x3f)
#define CAPT(m)   ((m>>12) & 0xf )
#define PROM(m)   ((m>>16) & 0xf )
#define ENPASS(m) ((m>>20) & 0x1 )
#define PAWNST(m) ((m>>21) & 0x1 )
#define CAST(m)   ((m>>22) & 0x1 )
*/

// Redefine as functions for fun :shrug:
inline int get_from_sq(int mv){
	return (mv & 0x7f);
}
inline int get_to_sq(int mv){
	return ((mv >> 7) & 0x7f);
}
inline int get_captured_pc(int mv){
	return ((mv >> 14) & 0xf);
}
inline int get_promoted_to_pc(int mv){
	return ((mv >> 18) & 0xf);
}
inline int get_en_pass_flag(int mv){
	return ((mv >> 22) & 0x1);
}
inline int get_pawn_st_flag(int mv){
	return ((mv >> 23) & 0x1);
}
inline int get_castle_flag(int mv){
	return ((mv >> 24) & 0x1);
}

inline bool is_valid_position(int position){
	return DEFAULT_BOARD[position] != PieceType::INV;
}

inline int set_to_sq(int sq, int base){
	return base + (sq << 7);
}
inline int set_to_sq(int sq){
	return (sq << 7);
}

inline int make_move(int from){
	return from;
}
inline int make_move(int from, int to){
	return from + (to << 7);
}
inline int make_move(int from, int to, PieceType captured){
	return from + (to << 7) + ((int) captured << 14);
}
inline int make_move(int from, int to, PieceType captured, PieceType promotion){
	return from + (to << 7) + ((int) captured << 14) + ((int) promotion << 18);
}
inline int make_move(int from, int to, PieceType captured, PieceType promotion, int en_passant){
	return from + (to << 7) + ((int) captured << 14) + ((int) promotion << 18) + (en_passant << 22);
}
inline int make_move(int from, int to, PieceType captured, PieceType promotion, int en_passant, int pawn_start){
	return from + (to << 7) + ((int) captured << 14) + ((int) promotion << 18) + (en_passant << 22) + (pawn_start << 23);
}
inline int make_move(int from, int to, PieceType captured, PieceType promotion, int en_passant, int pawn_start, int castle_move){
	return from + (to << 7) + ((int) captured << 14) + ((int) promotion << 18) + (en_passant << 22) + (pawn_start << 23) + (castle_move << 24);
}


#endif