const axios = require('axios')
const Logger = require('../Logger')
const htmlSanitizer = require('../utils/htmlSanitizer')

class iTunes {
  constructor() { }

  // https://developer.apple.com/library/archive/documentation/AudioVideo/Conceptual/iTuneSearchAPI/Searching.html
  search(options) {
    if (!options.term) {
      Logger.error('[iTunes] Invalid search options - no term')
      return []
    }
    var query = {
      term: options.term,
      media: options.media,
      entity: options.entity,
      lang: options.lang,
      limit: options.limit,
      country: options.country
    }
    return axios.get('https://itunes.apple.com/search', { params: query }).then((response) => {
      return response.data.results || []
    }).catch((error) => {
      Logger.error(`[iTunes] search request error`, error)
      return []
    })
  }

  // Example cover art: https://is1-ssl.mzstatic.com/image/thumb/Music118/v4/cb/ea/73/cbea739b-ff3b-11c4-fb93-7889fbec7390/9781598874983_cover.jpg/100x100bb.jpg
  // 100x100bb can be replaced by other values https://github.com/bendodson/itunes-artwork-finder
  // Target size 600 or larger
  getCoverArtwork(data) {
    if (data.artworkUrl600) {
      return data.artworkUrl600
    }
    // Should already be sorted from small to large
    var artworkSizes = Object.keys(data).filter(key => key.startsWith('artworkUrl')).map(key => {
      return {
        url: data[key],
        size: Number(key.replace('artworkUrl', ''))
      }
    })
    if (!artworkSizes.length) return null

    // Return next biggest size > 600
    var nextBestSize = artworkSizes.find(size => size.size > 600)
    if (nextBestSize) return nextBestSize.url

    // Find square artwork
    var squareArtwork = artworkSizes.find(size => size.url.includes(`${size.size}x${size.size}bb`))

    // Square cover replace with 600x600bb
    if (squareArtwork) {
      return squareArtwork.url.replace(`${squareArtwork.size}x${squareArtwork.size}bb`, '600x600bb')
    }

    // Last resort just return biggest size
    return artworkSizes[artworkSizes.length - 1].url
  }

  cleanAudiobook(data) {
    return {
      id: data.collectionId,
      artistId: data.artistId,
      title: data.collectionName,
      author: data.artistName,
      description: htmlSanitizer.stripAllTags(data.description || ''),
      publishedYear: data.releaseDate ? data.releaseDate.split('-')[0] : null,
      genres: data.primaryGenreName ? [data.primaryGenreName] : [],
      cover: this.getCoverArtwork(data)
    }
  }

  searchAudiobooks(term) {
    return this.search({ term, entity: 'audiobook', media: 'audiobook' }).then((results) => {
      return results.map(this.cleanAudiobook.bind(this))
    })
  }

  cleanPodcast(data) {
    return {
      id: data.collectionId,
      artistId: data.artistId || null,
      title: data.collectionName,
      artistName: data.artistName,
      description: htmlSanitizer.sanitize(data.description || ''),
      descriptionPlain: htmlSanitizer.stripAllTags(data.description || ''),
      releaseDate: data.releaseDate,
      genres: data.genres || [],
      cover: this.getCoverArtwork(data),
      trackCount: data.trackCount,
      feedUrl: data.feedUrl,
      pageUrl: data.collectionViewUrl
    }
  }

  searchPodcasts(term, options = {}) {
    return this.search({ term, entity: 'podcast', media: 'podcast', ...options }).then((results) => {
      return results.map(this.cleanPodcast.bind(this))
    })
  }
}
module.exports = iTunes