import fsp from 'node:fs/promises';
import path from 'node:path';

import { NodeCache } from '@cacheable/node-cache';
import Debug from 'debug';

import { parseTwtxt } from 'twtxt-lib';
import { TwtKprConfiguration } from '../types.js';

/**
 *
 * @param param0
 * @returns
 */
export default function twtxtCache({
	publicDirectory,
	twtxtFilename,
}: Pick<TwtKprConfiguration, 'publicDirectory' | 'twtxtFilename'>) {
	let isLoaded = false;

	const debug = Debug('twtkpr:twtxtCache');

	const cache = new NodeCache();

	const reloadCache = async () => {
		const fileText = await fsp.readFile(
			path.join(publicDirectory, twtxtFilename),
			'utf8'
		);

		const parsedFile = parseTwtxt(fileText);
		Object.keys(parsedFile).forEach((key) => {
			cache.set(key, parsedFile[key as keyof typeof parsedFile]); // 10 seconds
		});

		cache.set('source', fileText);
		debug(`cache ${isLoaded ? 're' : ''}loaded`);

		isLoaded = true;
	};

	reloadCache();

	return {
		cache,
		reloadCache,
	};
}