import { Application } from "express";
import expressAsyncHandler from "express-async-handler";
import createHttpError from "http-errors";
import ytmApi from "../utils/ytmApi.js";
import downloadSong from "../utils/download.js";
import { existsSync, realpathSync } from 'fs';
import { dbRead, dbStore } from "../database.js";
import md5 from "md5";
import { SongDetailed, SongFull } from "ytmusic-api";

export default function routeYTM(app: Application) {

    app.get('/music/search', expressAsyncHandler(
        async (req, res) => {
            if (typeof req.query.q !== 'string') throw createHttpError[400]();
            var songs: SongDetailed[] | null = dbRead('cache', md5(req.query.q));
            if (!songs) {
                songs = await ytmApi.searchSongs(req.query.q);
                dbStore('cache', md5(req.query.q), songs);
            }
            for (const song of songs) {
                dbStore('cache', song.videoId, song);
            }
            res.send(songs);
        }
    ));

    app.get('/music/get', expressAsyncHandler(
        async (req, res) => {
            if (typeof req.query.id !== 'string') throw createHttpError[400]();
            var song: SongDetailed | SongFull | null = dbRead('cache', req.query.id);
            if (!song) {
                song = await ytmApi.getSong(req.query.id);
                dbStore('cache', req.query.id, song);
            }
            res.send(song);
        }
    ));

    app.get('/music/lyrics', expressAsyncHandler(
        async (req, res) => {
            if (typeof req.query.id !== 'string') throw createHttpError[400]();
            var lyrics = dbRead('cache', md5(`lyrics_${req.query.id}`));
            if (!lyrics) {
                lyrics = await ytmApi.getLyrics(req.query.id);
                dbStore('cache', md5(`lyrics_${req.query.id}`), lyrics ?? 1);
            }
            if (lyrics === 1) throw createHttpError[404]();
            res.send(lyrics);
        }
    ));

    app.get('/music/file', expressAsyncHandler(
        async (req, res) => {
            if (typeof req.query.id !== 'string') throw createHttpError[400]();
            const filePath = `./tmpStore/${md5(req.query.id)}.mp3`;
            if (!existsSync(filePath)) await downloadSong(req.query.id);
            if (existsSync(filePath)) {
                res.sendFile(realpathSync(filePath));
            } else {
                throw createHttpError[404]();
            }
        }
    ));

}