var express = require('express');
var YoutubeMp3Downloader = require("youtube-mp3-downloader");
var fs = require('fs');
var path = require('path');

var router = express.Router();
var YD = new YoutubeMp3Downloader({
  "ffmpegPath": __dirname + "/../bin/ffmpeg",
  "outputPath": __dirname + "/../music",
  "youtubeVideoQuality": "highest",
  "queueParallelism": 1,
  "progressTimeout": 2000
});
const rootdir = path.join(__dirname, '/../');

/* GET home page. */
router.get('/', (_req, res, _next) => {
  res.render('index', { title: 'Express' });
});

router.get('/download', (req, res, _next) => {
  YD.download(req.query.url);

  YD.on('finished', (err, data) => {
    if (err) {
      res.json({ result: err });
    } else {
      res.json({ result: data });
    }
  });
});

router.get('/get/:type/:id', (req, res, _next) => {
  const type = req.params.type;
  const id = req.params.id;
  let db = {};

  if (type === 'song') {
    db = require(rootdir + '/songs.json');
  } else if (type === 'album') {
    db = require(rootdir + '/albums.json');
  } else if (type === 'artist') {
    db = require(rootdir + '/artists.json');
  }

  const arg = id.split(',');

  if (arg.length > 1) {
    let result = [];
    arg.forEach(element => {
      result.push(db[Number(element)]);
    });
    res.json({ result: result });
  } else {
    res.json({ result: db[id] });
  }

});

router.get('/play/:track', (req, res, _next) => {
  var key = req.params.track;

  var music = rootdir + "/music/" + key + ".mp3";

  var stat = fs.statSync(music);
  range = req.headers.range;
  var readStream;

  if (range !== undefined) {
    var parts = range.replace(/bytes=/, "").split("-");

    var partial_start = parts[0];
    var partial_end = parts[1];

    if (
      (isNaN(partial_start) && partial_start.length > 1) ||
      (isNaN(partial_end) && partial_end.length > 1)
    ) {
      return res.sendStatus(500); //ERR_INCOMPLETE_CHUNKED_ENCODING
    }

    var start = parseInt(partial_start, 10);
    var end = partial_end ? parseInt(partial_end, 10) : stat.size - 1;
    var content_length = end - start + 1;

    res.status(206).header({
      "Content-Type": "audio/mpeg",
      "Content-Length": content_length,
      "Content-Range": "bytes " + start + "-" + end + "/" + stat.size
    });

    readStream = fs.createReadStream(music, { start: start, end: end });
  } else {
    res.header({
      "Content-Type": "audio/mpeg",
      "Content-Length": stat.size
    });
    readStream = fs.createReadStream(music);
  }
  readStream.pipe(res);
});

router.get('/image/:path', (req, res, _next) => {
  const path = '/music/' + req.params.path

  res.sendFile(path, { root: rootdir });
});

router.get('/search/:query', (req, res, _next) => {
  const query = req.params.query;
  let result = [];

  fs.readdir(rootdir + '/database/', (err, files) => {
    files.forEach(file => {

      const content = require(rootdir + '/database/' + file);

      content.forEach(element => {
        if (element.name.match(query)) {
          result.push(element);
        }
      });

    });

    res.json({result: result});
  });
});

module.exports = router;