#include <gint/defs/types.h>
#include <stdbool.h>

#include "collide.h"
#include "conf.h"
#include "level.h"
#include "tiles.h"

Tile_flags collide_point(Vec point, const Level *level, uint layer_id) {
	Vec cursor; /* the final position to test */
	vec_cpy(&cursor, point);
	vec_div(&cursor, TILE_SIZE); /* get the expected tile ID */
	if (point.x < 0 || point.y < 0 ||
		cursor.x >= level->width || cursor.y >= level->height) {
		return 0; /* the point is out of bounds */
	}
	else {
		const Tile tile_id = level->layers[layer_id][cursor.x + cursor.y * level->width];
		return tile_get_flags(tile_id);
	}
}

Tile_flags player_collide_or(Player *player, Vec position, const Level *level, uint layer_id) {
	Vec pos;
	vec_cpy(&pos, position);
	Tile_flags flags = 0;
	flags |= collide_point(pos, level, layer_id);
	pos.x += player->hbox.x;
	flags |= collide_point(pos, level, layer_id);
	pos.y += player->hbox.y;
	flags |= collide_point(pos, level, layer_id);
	pos.x -= player->hbox.x;
	flags |= collide_point(pos, level, layer_id);
	return flags;
}

Tile_flags player_collide_and(Player *player, Vec position, const Level *level, uint layer_id) {
	Vec pos;
	vec_cpy(&pos, position);
	Tile_flags flags = -1;
	flags &= collide_point(pos, level, layer_id);
	pos.x += player->hbox.x;
	flags &= collide_point(pos, level, layer_id);
	pos.y += player->hbox.y;
	flags &= collide_point(pos, level, layer_id);
	pos.x -= player->hbox.x;
	flags &= collide_point(pos, level, layer_id);
	return flags;
}