import assets from "./assets.js";
import Rect from "./Rect.js";
import Vec2 from "./Vec2.js";
import Texture from "./Texture.js";

function findBounds(arr, bounds) {
	arr.forEach(e => {
		let right = (e.x + 1) * assets.tiles.tileWidth;
		let bottom = (e.y + 1) * assets.tiles.tileHeight;

		if (right > bounds.size.x)
			bounds.size.pixelX = right;
		if (bottom > bounds.size.y)
			bounds.size.pixelY = bottom;
	});
}

function rightOrBelow(r1, r2) {
	// r2 right of r1
	if (
			(r1.top === r2.top && r1.bottom == r2.bottom) &&
			(r1.right + 1 >= r2.left && r1.left <= r2.left))
		return true;

	// r2 below r1
	if (
			(r1.right === r2.right && r1.left == r2.left) &&
			(r1.bottom + 1 >= r2.top && r1.top <= r2.top))
		return true;

	return false;
}

function continuous(r1, r2) {
	return rightOrBelow(r1, r2) || rightOrBelow(r2, r1);
}

function flattened(arr, newArr = []) {
	arr.forEach(e => {
		if (e instanceof Array)
			flattened(e, newArr);
		else
			newArr.push(e);
	});
	return newArr;
}

export default class Structure {
	constructor(attrs, nestedArr) {
		this.texture = new Texture(assets.tiles, nestedArr);

		this.attrs = {
			wall: false,
			platform: false,
		}

		for (let a of attrs)
			this.setAttr(a);

		this.nestedArr = nestedArr;
		this.pos = new Vec2();
		this.bounds = new Rect(this.pos);
	}

	init() {
		var arr = flattened(this.nestedArr);

		findBounds(arr, this.bounds);
	}

	draw(ctx) {
		this.texture.draw(ctx, this.pos.pixelX, this.pos.pixelY);
	}

	setAttr(attr) {
		if (this.attrs[attr] == null)
			throw new Error("Invalid attribute:", attr);

		this.attrs[attr] = true;
		return this;
	}
}