import { parse } from 'url';
import querystring from 'querystring';
import request from 'superagent';
import Nodebrainz from 'nodebrainz';
import 'superagent-bluebird-promise';
import debuglog from 'debug';
import urlMatch from './url';

const debug = debuglog('combine.fm:youtube');

if (!process.env.YOUTUBE_KEY) {
  debug('YOUTUBE_KEY environment variable not found, deactivating Youtube.');
}

const credentials = {
  key: process.env.YOUTUBE_KEY,
};

const apiRoot = 'https://www.googleapis.com/youtube/v3';

const nodebrainz = new Nodebrainz({
  userAgent: 'combine.fm ( https://combine.fm )',
  defaultLimit: 10,
  retryOn: true,
  retryDelay: 3000,
  retryCount: 10,
});

export function* lookupId(id) {
  const path = `/videos?part=snippet%2CtopicDetails%2CcontentDetails&id=${id}&key=${credentials.key}`;
  try {
    const result = yield request.get(apiRoot + path).promise();
    const item = result.body.items[0];

    nodebrainz.luceneSearch('release', { query: item.snippet.title }, (err, response) => {
      response.releases.forEach((release) => {
        //console.log(release);
      });
    });

    const match = {
      id,
      service: 'youtube',
      name: item.snippet.title,
      type: 'track',
      album: { name: '' },
      streamUrl: `https://youtu.be/${id}`,
      purchaseUrl: null,
      artwork: {
        small: item.snippet.thumbnails.medium.url,
        large: item.snippet.thumbnails.high.url,
      },
    };

    return match;
  } catch (err) {
    debug(err);
    return { service: 'youtube' };
  }
}

export function* search(data) {
  let query;
  const type = data.type;

  if (type === 'album') {
    query = `${data.artist.name} ${data.name}`;
  } else if (type === 'track') {
    query = `${data.artist.name} ${data.name}`;
  }

  const path = `/search?part=snippet&q=${encodeURIComponent(query)}&type=video&videoCaption=any&videoCategoryId=10&key=${credentials.key}`;
  const result = yield request.get(apiRoot + path).promise();
  const item = result.body.items[0];

  if (!item) {
    return { service: 'youtube', type: 'video' };
  }
  return {
    service: 'youtube',
    type: 'video',
    id: item.id.videoId,
    name: item.snippet.title,
    streamUrl: `https://www.youtube.com/watch?v=${item.id.videoId}`,
    purchaseUrl: null,
    artwork: {
      small: item.snippet.thumbnails.medium.url,
      large: item.snippet.thumbnails.high.url,
    },
  };
}

export function parseUrl(url) {
  const parsed = parse(url);
  const query = querystring.parse(parsed.query);
  let id = query.v;

  if (!id) {
    id = parsed.path.substr(1);
    if (!id) {
      throw new Error();
    }
  }
  return lookupId(id, 'track');
}

export const id = 'youtube';
export const match = urlMatch;