const { ipcMain, nativeImage } = require('electron');
const fetch = require('node-fetch');

const config = require('../config');
const { cache } = require('../providers/decorators');

// Fill songInfo with empty values
/**
 * @typedef {songInfo} SongInfo
 */
const songInfo = {
  title: '',
  artist: '',
  views: 0,
  uploadDate: '',
  imageSrc: '',
  image: null,
  isPaused: undefined,
  songDuration: 0,
  elapsedSeconds: 0,
  url: '',
  album: undefined,
  videoId: '',
  playlistId: '',
};

// Grab the native image using the src
const getImage = cache(
  /**
   * @returns {Promise<Electron.NativeImage>}
   */
  async (src) => {
    const result = await fetch(src);
    const buffer = await result.buffer();
    const output = nativeImage.createFromBuffer(buffer);
    if (output.isEmpty() && !src.endsWith('.jpg') && src.includes('.jpg')) { // Fix hidden webp files (https://github.com/th-ch/youtube-music/issues/315)
      return getImage(src.slice(0, src.lastIndexOf('.jpg') + 4));
    }

    return output;
  },
);

const handleData = async (responseText, win) => {
  const data = JSON.parse(responseText);
  if (!data) {
    return;
  }

  const microformat = data.microformat?.microformatDataRenderer;
  if (microformat) {
    songInfo.uploadDate = microformat.uploadDate;
    songInfo.url = microformat.urlCanonical?.split('&')[0];
    songInfo.playlistId = new URL(microformat.urlCanonical).searchParams.get('list');
    // Used for options.resumeOnStart
    config.set('url', microformat.urlCanonical);
  }

  const { videoDetails } = data;
  if (videoDetails) {
    songInfo.title = cleanupName(videoDetails.title);
    songInfo.artist = cleanupName(videoDetails.author);
    songInfo.views = videoDetails.viewCount;
    songInfo.songDuration = videoDetails.lengthSeconds;
    songInfo.elapsedSeconds = videoDetails.elapsedSeconds;
    songInfo.isPaused = videoDetails.isPaused;
    songInfo.videoId = videoDetails.videoId;
    songInfo.album = data?.videoDetails?.album; // Will be undefined if video exist

    const thumbnails = videoDetails.thumbnail?.thumbnails;
    songInfo.imageSrc = thumbnails.at(-1)?.url.split('?')[0];
    songInfo.image = await getImage(songInfo.imageSrc);

    win.webContents.send('update-song-info', JSON.stringify(songInfo));
  }
};

// This variable will be filled with the callbacks once they register
const callbacks = [];

// This function will allow plugins to register callback that will be triggered when data changes
/**
 * @callback songInfoCallback
 * @param {songInfo} songInfo
 * @returns {void}
 */
/**
 * @param {songInfoCallback} callback
 */
const registerCallback = (callback) => {
  callbacks.push(callback);
};

let handlingData = false;

const registerProvider = (win) => {
  // This will be called when the song-info-front finds a new request with song data
  ipcMain.on('video-src-changed', async (_, responseText) => {
    handlingData = true;
    await handleData(responseText, win);
    handlingData = false;
    for (const c of callbacks) {
      c(songInfo, 'video-src-changed');
    }
  });
  ipcMain.on('playPaused', (_, { isPaused, elapsedSeconds }) => {
    songInfo.isPaused = isPaused;
    songInfo.elapsedSeconds = elapsedSeconds;
    if (handlingData) {
      return;
    }

    for (const c of callbacks) {
      c(songInfo, 'playPaused');
    }
  });
};

const suffixesToRemove = [
  ' - topic',
  'vevo',
  ' (performance video)',
  ' (clip officiel)',
];

function cleanupName(name) {
  if (!name) {
    return name;
  }

  name = name.replace(/\((?:official)? ?(?:music)? ?(?:lyrics?)? ?(?:video)?\)$/i, '');
  const lowCaseName = name.toLowerCase();
  for (const suffix of suffixesToRemove) {
    if (lowCaseName.endsWith(suffix)) {
      return name.slice(0, -suffix.length);
    }
  }

  return name;
}

module.exports = registerCallback;
module.exports.setupSongInfo = registerProvider;
module.exports.getImage = getImage;
module.exports.cleanupName = cleanupName;