'use strict'
const youtubedl = require('youtube-dl')
const fs = require('fs')
const ffmpeg = require('fluent-ffmpeg')
const timestamp = require('time-stamp')

let viewCounter = 0;
let files = [];
let day;
let month;
let announcement = 'Twitter download seems to work fine now!';

class DownloadController {

  async index ({ view, response }) {
    // Get date for some event
    let today = new Date();
    day = today.getDay();
    month = today.getMonth();

    viewCounter++;
    if (response.request.url == '/legacy') return view.render('legacy', { title: 'le epic downloader v0.11.3', viewCounter: viewCounter, day: day, month: month, announcement: announcement});

    files = [];
    let file = []
    for (let f of fs.readdirSync('./public/uploads')) {
      file.push(f)
    }
    // get the 5 most recent files
    file = file.sort(function(a, b) {
      if ((a || b).endsWith('.mp4') && !(a || b).startsWith('HIDE')) {
        let time1 = fs.statSync(`./public/uploads/${b}`).ctime;
        let time2 = fs.statSync(`./public/uploads/${a}`).ctime; 
        if (time1 < time2) return -1;
        if (time1 > time2) return 1;
      }
      return 0;
    }).slice(0, 5)

    file.forEach((file) => {
      // If mp4 and is not to be hidden from the recent feed
      if (file.endsWith('.mp4') && !file.startsWith('HIDE')) {
        let fileInfo = fs.statSync(`./public/uploads/${file}`);
        // Take screenshot at the first frame of the mp4 file
        ffmpeg(`./public/uploads/${file}`)
        .takeScreenshots({ count: 1, timemarks: [ 1 ], size: '720x480', filename: file + '.png' }, 'public/thumbnail')
        .on('error', (err) => {
          console.error(err);
          return;
        });

        if (fs.existsSync(`./public/thumbnail/${file}.png`)) {
          // Get the image as base64
          let imgData = fs.readFileSync(`./public/thumbnail/${file}.png`).toString('base64');
          if (imgData) {
            // Send file name, file size in MB relative path for the file and base64 of the image
            files.push({ name: file, size: (fileInfo.size / 1000000.0).toFixed(2), location: `uploads/${file}`, img: imgData });
            fs.unlinkSync(`./public/thumbnail/${file}.png`);
          }
        }
        // If mp3 or flac and not to be hidden from the recent feed
      } else if ((file.endsWith('.mp3') || file.endsWith('.flac')) && !file.startsWith('HIDE')) {
        let fileInfo = fs.statSync(`./public/uploads/${file}`);
        // Send file name, file size in MB relative path for the file and base64 of music.png
        files.push({ name: file, size: (fileInfo.size / 1000000.0).toFixed(2), location: `uploads/${file}`, img: fs.readFileSync(`./public/asset/music.png`).toString('base64') });
      }
    });
		return view.render('index', { title: 'le epic downloader v0.11.3', viewCounter: viewCounter, file: files, day: day, month: month, announcement: announcement });
  }

  async download({ view, request, response }) {
    let page = 'index';
    if (response.request.url == '/legacy') page = 'legacy';
      // To be honest i forgot what it does, but i think i need it
      response.implicitEnd = false

      let option, DLFile
      // Get form input
      let data = {
        url: request.input('URL'),
        quality: request.input('quality'),
        format: request.input('format'),
        alt: request.input('alt'),
        feed: request.input('feed')
      }

      if (!data.url) {
        return view.render(page, {
          title: 'le epic downloader v0.11.3',
          viewCounter: viewCounter,
          file: files,
          day: day, month: month, announcement: announcement ,
          error: true,
          errormsg: 'bruh moment, you didin\'t input a link.'
        });
      }

      // Youtube-dl quality settings
      if (data.quality == 'small')
        option = 'worst'
      else
        option = 'best'

      // If alt download ( Quality settings and file format option doesn't work here )
      if (data.alt) {
        if (fs.existsSync('./public/uploads/alt.mp4')) {
          fs.unlink('./public/uploads/alt.mp4', (err) => {
            if (err);
          });
        }
  
        return youtubedl.exec(data.url, ['--format=mp4', '-o', `public/uploads/alt.mp4`], {}, function(err, output) {
          if (err) {
            return view.render(page, {
              title: 'le epic downloader v0.11.3',
              viewCounter: viewCounter,
              file: files,
              day: day, month: month, announcement: announcement ,
              error: true,
              errormsg: 'bruh moment, you didin\'t input a valid link.'
            });
          }
  
          return response.attachment('./public/uploads/alt.mp4');
        });
      } else {
        // Download as mp4
        let video = youtubedl(data.url, ['--format=mp4', '-f', option]);

        video.on('error', function(err) {
          console.error(err)
          return view.render(page, {
            title: 'le epic downloader v0.11.3',
            viewCounter: viewCounter,
            file: files,
            day: day, month: month, announcement: announcement ,
            error: true,
            errormsg: 'bruh moment, you didin\'t input a valid link.'
          });
      })

        video.on('info', function(info) {
          // Set file name
          let title = info.title;
          DLFile = `${timestamp('DD_MM_YYYY')}${title.slice(0,10).replace(/\s/g, '_')}.${info.ext}`;
          // If no title use the ID
          if (title == '_') title = `_${info.id}`;
          // If user want to hide from the feed 
          if (data.feed == 'on') 
            DLFile = `HIDE${timestamp('DD_MM_YYYY')}${title.slice(0,10).replace(/\s/g, '_')}.${info.ext}`;

          DLFile = DLFile.replace(/[()]/g, '_');
          video.pipe(fs.createWriteStream(`./public/uploads/${DLFile}`));
        });

        video.on('end', function() {
          if (data.format == 'mp4') {
            // If user requested mp4 directly attach the file
            return response.attachment(`./public/uploads/${DLFile}`)
          } else {
            // If user requested an audio format, convert it
            ffmpeg(`./public/uploads/${DLFile}`)
            .noVideo()
            .audioChannels('2')
            .audioFrequency('44100')
            .audioBitrate('320k')
            .format(data.format)
            .save(`./public/uploads/${DLFile}.${data.format}`)
            .on('end', () => {
              fs.unlinkSync(`./public/uploads/${DLFile}`);
              return response.attachment(`./public/uploads/${DLFile}.${data.format}`);
            })
          }
        });
      }
  }
}

module.exports = DownloadController