import { v4 } from 'uuid';
import shjs from 'shelljs';
import fs from 'fs';
import md5 from 'md5';

const process: Record<string, boolean> = {};

export default function downloadSong(id: string): Promise<string> {
    return new Promise<string>((resolve, reject) => {
        const url: string = `https://music.youtube.com/watch?v=${id}`;
        const filename: string = md5(id);
        if (process[id]) {
            reject(new Error(`Already downloading ${id}`));
            return;
        }

        process[id] = true;

        shjs.exec(`../yt-dlp.sh --sponsorblock-remove all -o ${filename} ${url}`, {
            cwd: './tmpStore',
            async: true
        }).on('exit', () => {
            const fileName = fs.readdirSync('./tmpStore').find(x => x.includes(filename));
            const newFileName = `${filename}.mp3`;
            shjs.exec(`ffmpeg -i '${fileName}' '${newFileName}'`, {
                async: true,
                cwd: './tmpStore'
            }).on('exit', () => {
                resolve(newFileName);
                delete process[id];
            });
        });
    });
}