export default class AudioPlayer {
  files = {}
  players = {}

  load(graph) {
    this.files = graph.uploads
    .filter(upload => upload.tag === 'audio')
    .reduce((accumulator, item) => {
      accumulator[item.id] = item
      return accumulator
    }, {})
    console.log(this.files)
  }

  playPage(page) {
    console.log(page.settings)
    const { background_audio_id, restart_audio } = page.settings
    if (background_audio_id in this.files) {
      this.playFile({
        item: this.files[background_audio_id],
        restart: !!restart_audio,
      })
    }
  }

  playFile({ item, restart, loop }) {
    return new Promise((resolve, reject) => {
      const { id, url } = item
      console.log('play >>', id, url)
      if (id in this.players) {
        if (restart) {
          this.players[id].currentTime = 0
          this.players[id].play()
          return resolve()
        }
        return reject()
      }
      const player = document.createElement('audio')
      const handleEnded = () => {
        unbind()
        resolve()
      }
      const handleError = (error) => {
        console.error(error)
        unbind()
        reject(error)
      }
      const bind = () => {
        player.addEventListener('ended', handleEnded)
        player.addEventListener('error', handleError)
        this.players[id] = player
      }
      const unbind = () => {
        player.removeEventListener('ended', handleEnded)
        player.removeEventListener('error', handleError)
        delete this.players[id]
      }
      const start = () => {
        player.src = url
        player.play()
      }
      bind()
      start()
    })
  }
}