#!/usr/bin/env node

/* eslint-disable no-console */

const fs = require('fs-extra');
const tmp = require('tmp-promise');
const os = require('os');
const shitExec = require('child_process').exec;
const Path = require('path');

async function exec(...args) {
  return new Promise((resolve, reject) => {
    shitExec(...args, (error, stdout) => {
      if (error) {
        reject(error);
      } else {
        resolve(stdout.trim());
      }
    });
  });
}

const TMP_DIR = `/tmp/mudl_${Math.random().toString(36).substring(7)}`;

async function thing() {
  if (!process.argv[2]) {
    console.log('need a video');
    return;
  }

  const [pAlbum, pArtist, pTitle] = (process.argv.length >= 3 ? process.argv.slice(3).join(' ').trim().match(/^([^/]+)(?:\/([^/]+)(?:\/([^/]+))?)?$/) || [] : []).slice(1).map((item) => {
    return item ? item.trim() : item;
  });

  const dir = await fs.mkdir(TMP_DIR);

  let files = [];
  let inputType = null;

  if (['/', '~', '.'].includes(process.argv[2][0])) {
    console.log('got a str8 filename');

    inputType = 'file';

    files = [{
      image: null,
      file: process.argv[2],
    }];
  } else {
    console.log('got a link');
    inputType = 'url';

    console.log(`Temporarily saving to ${dir.path}`);
    await exec(`youtube-dl --write-thumbnail -f bestaudio -x -o "${dir.path}/[%(album)s] -- [%(artist)s] -- [%(track_number)s] -- [%(track)s] -- [%(title)s].%(ext)s" ${process.argv[2]}`);
    console.log('Done saving');

    const filesList = await fs.readdir(dir.path);

    files = filesList.map((rawFilePath) => {
      const filePath = Path.parse(rawFilePath);

      if (['.png', '.jpg', '.webp'].includes(filePath.ext)) return null;

      const rawImagePath = filesList.find((rawP) => {
        const p = Path.parse(rawP);
        return ['.png', '.jpg', '.webp'].includes(p.ext) && p.name === filePath.name;
      });

      let album = pAlbum || null;
      let artist = pArtist || null;
      let title = pTitle || null;
      let trackNum = null;

      let rawTitle = null;

      const fullMatch = rawFilePath.match(/^\[(.*?)\] -- \[(.*?)\] -- \[(.*?)\] -- \[(.*?)\] -- \[(.*?)\]\..*?$/);

      if (fullMatch !== null) {
        const [yAlbum, yArtist, yTrackNum, yTitle, yRawTitle] = fullMatch.slice(1)
          .map(item => (item === 'NA' ? null : item))
          .map(item => (item !== null ? item.trim() : null))
          .map(item => (item !== null ? item.replace(/(^|\s+)(.)_($|\s+)/g, '$1$2$3') : null));

        if (yAlbum && !album) album = yAlbum;
        if (yArtist && !artist) artist = yArtist;
        if (yTitle && !title) title = yTitle;
        if (yTrackNum && !trackNum) trackNum = yTrackNum;
        if (yRawTitle && !rawTitle) rawTitle = yRawTitle;
      }

      if (artist === null && title === null) {
        const rawTitleMatch = rawTitle.match(/^([^-]+)(?:\s*-\s*(.+))?$/);

        if (rawTitleMatch[2] !== undefined && rawTitleMatch[2] !== null) {
          [artist, title] = rawTitleMatch.slice(1).map(item => (item ? item.trim() : item));
        } else {
          title = rawTitleMatch[1].trim();
        }
      }

      if (album === null) album = 'Unknown';
      if (artist === null) artist = 'Unknown';
      if (title === null) title = 'Unknown';

      return {
        file: Path.join(dir.path, rawFilePath),
        image: Path.join(dir.path, rawImagePath),
        album,
        artist,
        title,
      };
    }).filter(p => p !== null);
  }

  for (const {
    album, artist, title, trackNum, file, image,
  } of files) {
    const path = `${os.homedir()}/Music/${album}/${artist} - ${title}.mp3`;
    await fs.ensureDir(`${os.homedir()}/Music/${album}`);

    if (!(await fs.exists(path))) {
      console.log(`Encoding to: ${path}`);
      if (image) {
        await exec(`ffmpeg -i "${file}" -i "${image}" -map 0:0 -map 1:0 -id3v2_version 4 -metadata:s:v title="Album cover" -metadata:s:v comment="Cover (front)" "${path}"`);
      } else {
        await exec(`ffmpeg -i "${file}" -id3v2_version 4 "${path}"`);
      }
    }

    console.log('Adding id3v2 tags');

    const tagArgs = [];

    tagArgs.push(['--artist', artist || 'Unknown']);
    tagArgs.push(['--album', album || 'Unknown']);
    tagArgs.push(['--song', title || 'Unknown']);
    if (inputType === 'url') tagArgs.push(['--comment', process.argv[2]]);
    if (trackNum) tagArgs.push(['--track', trackNum]);

    const tagArgsString = tagArgs.map(([tag, val]) => `${tag} "${val}"`).join(' ');
    await exec(`id3v2 ${tagArgsString} "${path}"`);

    if (await fs.exists(Path.join(os.homedir(), '.tmsu'))) {
      console.log('adding tmsu tags');

      const fsTagArgs = [];

      if (artist) fsTagArgs.push(['artist', artist]);
      if (album) fsTagArgs.push(['album', album]);

      if (fsTagArgs.length > 0) {
        const fsTagArgsString = fsTagArgs.map(([tag, val]) => `"${tag}=${val}"`).join(' ');
        await exec(`tmsu tag "${path}" ${fsTagArgsString}`);
      }
    }

    console.log(`Finished: ${album}/${artist} - ${title}`);
  }

  console.log('Finished everything, cleaning up...');
  await dir.cleanup();
  console.log('Done!');
}

(async () => {
  try {
    await thing();
  } catch (err) {
    console.error(err);
    await fs.rmdir(TMP_DIR, { recursive: true });
  }
})();