#ifndef GAME_UTIL_H
#define GAME_UTIL_H

#include "Driver.h"

#define KEY_LEFT	1
#define KEY_RIGHT	2
#define KEY_UP		3
#define KEY_DOWN	0

typedef struct {
	int r;
	int c;
} pos_t;

static inline void uscrn_to_dscrn (uint8_t uscrn[side][side], uint8_t *dscrn) {
	int i, j;
	for (i = 0; i < side; i++)
		for (j = 0; j < side; j++)
			dscrn[i] |= ((!!uscrn[side - j - 1][side - i - 1]) << j);
}

static inline void board_to_scrn (uint8_t board[height][width], uint8_t *scrn) {
	int i, j;
	uint8_t uscrn1[side][side];
	uint8_t uscrn2[side][side];
	for (i = 0; i < height; i++) {
		for (j = 0; j < width; j++) {
			if (i < side)
				uscrn1[i][j] = board[i][j];
			else
				uscrn2[i - side][j] = board[i][j];
		}
	}
	uscrn_to_dscrn(uscrn1, scrn);
	uscrn_to_dscrn(uscrn2, scrn + side);
}

static inline void draw_board (uint8_t board[height][width]) {
	uint8_t scrn[16] = {0};
	board_to_scrn(board, scrn);
	driver_draw(scrn);
}

static inline int inside (int i, int j) {
	return i >= 0 && i < height && j >= 0 && j < width;
}

static inline uint32_t rand (uint32_t *seed) {
	uint32_t bit  = (((*seed) >> 0) ^ ((*seed) >> 2) ^ ((*seed) >> 3)
			^ ((*seed) >> 5) ) & 1;
	return (*seed) = ((*seed) >> 1) | (bit << 15);
}

static inline int press_once (int *key_state, int key) {
	if (driver_getkey(key) && !key_state[key]) {
		key_state[key] = 1;
		return 1;
	}
	else if (key_state[key] && !driver_getkey(key)) {
		key_state[key] = 0;
	}
	return 0;
}

#endif