import { promises as fs } from "fs";
import path from "path";
import _locreq from "locreq";

const locreq = _locreq(import.meta.dirname);

let all_icon_names: Promise<string[]> | null = null;

const cache = {} as Record<string, Promise<string> | undefined>;

export const svg_icon_path = "src/icons";

async function getIconUncached(icon_name: string): Promise<string> {
	return fs.readFile(
		locreq.resolve(path.resolve(svg_icon_path, icon_name + ".svg")),
		"utf-8"
	);
}

export async function icon(icon_name: string) {
	if (!cache[icon_name]) {
		cache[icon_name] = getIconUncached(icon_name);
	}
	try {
		return cache[icon_name];
	} catch (e) {
		console.error(e);
		return "";
	}
}

export async function getAllIconNames() {
	if (!all_icon_names) {
		all_icon_names = fs
			.readdir(locreq.resolve(svg_icon_path))
			.then((files) => files.map((file) => path.parse(file).name));
	}
	return all_icon_names;
}