import * as world from "./world.mjs";
const BOX_SIZE = world.BOX_SIZE;



const entities = [];

export function create (box, x = 0, y = 0, color = "#fff") {
	const entity = {
		id: entities.length,
		box,
		x,
		y,
		color,
	};
	entities.push(entity);
	return entity;
}

export function destroy (id) {
	// returns the destroyed entity, idk if that makes sense.
	return entities.splice(id, 1)[0];
}

export function for_each (callback) {
	entities.forEach(entity => {
		callback(entity, entity.id);
	});
}

function clamp_pos (entity) {
	if (entity.x < 0) entity.x = 0;
	if (entity.x >= BOX_SIZE) entity.x = BOX_SIZE - 1;
	if (entity.y < 0) entity.y = 0;
	if (entity.y >= BOX_SIZE) entity.y = BOX_SIZE - 1;
	return entity;
}

export function set_pos (entity, x, y) {
	entity.x = x;
	entity.y = y;

	if (out_of_bounds(entity)) {
		if (entity.box.parent) {
			entity.box = entity.box.parent;
			// TODO: exit from side of box.
		}
		clamp_pos(entity);
	}

	if (world.get_tile(entity.box, entity.x, entity.y)?.type === "box") {
		entity.box = world.get_tile(entity.box, entity.x, entity.y).box;
		// TODO: enter at edge of box.
	}
}

export function move (entity, d_x, d_y) {
	set_pos(entity, entity.x + d_x, entity.y + d_y);
}

function out_of_bounds (entity) {
	return world.out_of_bounds(entity.x, entity.y);
}