import * as graphics from "./graphics_core.mjs";
export * from "./graphics_core.mjs";

import { range, iter_2d } from "./utils/range.mjs";
import * as entity from "./entity.mjs";



const canvas = document.getElementById("canvas");
const canvas_context = canvas.getContext("2d");
graphics.set_size(canvas.width, canvas.height);

const SCALE = 81;

export function draw_tile (x, y) {
	graphics.fill_rect(x * SCALE, y * SCALE, SCALE, SCALE);
}

function checkerboard (x, y) {
	return ((x ^ y) & 1) === 0;
}

export function draw_floor (box_size) {
	graphics.clear("#888");
	graphics.set_color("#aaa");
	iter_2d(range(0, box_size - 1), (x, y) => {
		if (checkerboard(x, y)) draw_tile(x, y);
	});
}

export function draw_world (box_size, get_tile) {
	draw_floor(box_size);

	iter_2d(range(0, box_size - 1), (x, y) => {
		const tile = get_tile(x, y);

		switch (tile.type) {
			case "box": {
				graphics.set_color("#ff0");
				draw_tile(x, y);
				break;
			}
		}
	});

	entity.for_each((entity, id) => {
		graphics.set_color(entity.color);
		draw_tile(entity.x, entity.y);
	});
}

export function render () {
	graphics.render(canvas_context);
}