// @ts-ignore
import {convert} from './objparser';
import {initBuffers, deleteBuffers} from './buffers';

/**
 * Fetch an obj file
 * @param {string} url the url to fetch the object from
 * @return {string} the raw data of the obj file
 */
export async function fetchObj(url: string) {
	const response = await fetch(url);
	const data = await response.text();
	return data;
}

/**
 * Pushes a new obj file to the gl buffer
 * @param {any} gl the WebGL context
 * @param {string} data the obj file to push
 * @param {any} buffers the buffers to be updated
 * @param {any} params the params to be updated
 * @param {boolean} firstCall is it first object updated ?
 * @return {Array<any>} the updated buffers and params
 */
export function updateObj(
	gl: any,
	data: string,
	buffers: any,
	params: any,
	firstCall: boolean = false) {
	const [
		positions,
		normals,
		uvs,
		indices,
	] = convert(data);
	params.length = indices.length;
	let x = 0;
	let y = 0;
	let z = 0;
	let maxx = positions[0];
	let maxy = positions[1];
	let maxz = positions[2];
	let minx = positions[0];
	let miny = positions[1];
	let minz = positions[2];
	for (let i = 0; i < positions.length; i++) {
		if (i % 3 == 0) {
			if (positions[i] > maxx) {
				maxx = positions[i];
			} else if (positions[i] < minx) {
				minx = positions[i];
			}
			x += positions[i];
		} else if (i % 3 == 1) {
			if (positions[i] > maxy) {
				maxy = positions[i];
			} else if (positions[i] < miny) {
				miny = positions[i];
			}
			y += positions[i];
		} else {
			if (positions[i] > maxz) {
				maxz = positions[i];
			} else if (positions[i] < minz) {
				minz = positions[i];
			}
			z += positions[i];
		}
	}
	params.range = Math.max(maxx - minx, maxy - miny, maxz - minz);
	params.avg.x = x / (positions.length / 3);
	params.avg.y = y / (positions.length / 3);
	params.avg.z = z / (positions.length / 3);
	if (!firstCall) {
		deleteBuffers(gl, buffers);
	}
	buffers = initBuffers(gl, positions, indices, normals, uvs);
	return [buffers, params];
}