import React from 'react';
import ReactDOM from 'react-dom';
import PropTypes from 'prop-types';

const HOCAudio = Audio => class HOCAudioComponent extends React.Component {
  static propTypes = {
    playlist: PropTypes.arrayOf(PropTypes.shape({
      name: PropTypes.string,
      src: PropTypes.string,
      img: PropTypes.string,
      comments: PropTypes.arrayOf(PropTypes.shape({
        time: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
        content: PropTypes.string
      }))
    })).isRequired
  };
  constructor(props) {
    super(props);
    if (!this.props.playlist || this.props.playlist.length === 0) {
      throw new Error('You should provide a playlist which contains at least 1 audio object');
    }
    if (this.props.fullPlayer) {
      this.props.playlist.forEach((song) => {
        if (!song.img) {
          throw new Error('You should provide song.img when the fullPlayer is enabled.');
        }
        if (this.props.comment && !song.comments) {
          throw new Error('You turned on commenting function and you need to provide the `comments` field for each song in the playlist');
        }
      });
    }

      // bind methods
      // this.playNext = props.recordButton2; // A boolean to determine whether to play the next song or not
    this.loadSrc = this.loadSrc.bind(this);
    this.togglePlayPause = this.togglePlayPause.bind(this);
    this.onCanPlay = this.onCanPlay.bind(this);
    this.onEnded = this.onEnded.bind(this);
    this.onPlay = this.onPlay.bind(this);
    this.onPause = this.onPause.bind(this);
      // this.onTimeUpdate = this.onTimeUpdate.bind(this);
    this.setVolume = this.setVolume.bind(this);
    this.setProgress = this.setProgress.bind(this);
    this.skipToNext = this.skipToNext.bind(this);
    this.skipToPrevious = this.skipToPrevious.bind(this);
    this.togglePlayingState = this.togglePlayingState.bind(this);
    this.playEventHandler = this.playEventHandler.bind(this);
    this.pauseEventHandler = this.pauseEventHandler.bind(this);
    this.skipToNextEventHandler = this.skipToNextEventHandler.bind(this);
    this.skipToPreviousEventHandler = this.skipToPreviousEventHandler.bind(this);

    const discardPileSize = Math.ceil(props.playlist.length / 2);
    this.state = {
      playing: false,
      currentPlaylistPos: 0,
      playingState: 0, // 0: cycle, 1: repeat, 2: shuffle
      progress: 0,
      duration: 0,
      volume: 1,
      shuffleState: {
        size: discardPileSize,
        drawPile: [...Array(props.playlist.length).keys()], // initialise full playlist indexes
        discardPile: []
      }
    };
  }
  onCanPlay() {
      // console.log('audio oncanplay');
    // this.playNext = this.state.playing;
    this.setState({
      duration: this.audioElement.duration
    });
  }
  onPlay() {
      // console.log('audio onplay');
    this.playNext = true;
    this.setState({ playing: true });
    this.intervalId = setInterval(() => {
      this.setState({ progress: this.audioElement.currentTime });
    }, 900);
  }
  onPause() {
      // console.log('audio onpause');
    this.setState({ playing: false });
    this._clearInterval();
  }
  onEnded() {
      // console.log('audio onended');
    if (this.playNext) {
      this.handleEndedProgress();
    }
  }
    // onTimeUpdate(e) {
    //   this.setState({ progress: this.audioElement.currentTime });
    //   console.log(e.target.currentTime);
    // }
  handleEndedProgress() {
    this.playNext = true;
    switch (this.state.playingState) {
      case 0: {
        this.skipToNext();
        break;
      }
      case 1: {
        this.setState({ progress: 0 });
        this.audioElement.currentTime = 0;
        this.togglePlayPause();
        break;
      }
      case 2: {
        const ss = this.state.shuffleState;
        const currentSongIndex = ss.drawPile.indexOf(this.state.currentPlaylistPos);
        const newDrawPile = ss.drawPile;
        const newDiscardPile = ss.discardPile;
        if (currentSongIndex !== -1) {
          newDrawPile.splice(currentSongIndex, 1);
          newDiscardPile.push(this.state.currentPlaylistPos);
        }
        const index = Math.floor(Math.random() * ss.drawPile.length);
        const sliced = newDrawPile.slice(index, index + 1);
        this.setState({
          currentPlaylistPos: sliced[0],
          shuffleState: {
            size: ss.size,
            drawPile: newDrawPile,
            discardPile: newDiscardPile
          }
        });
        if (newDiscardPile.length === ss.size) {
          const shiftedElement = newDiscardPile.shift();
          newDrawPile.push(shiftedElement);
          this.setState({
            shuffleState: {
              size: ss.size,
              drawPile: newDrawPile,
              discardPile: newDiscardPile
            }
          });
        }
        this.loadSrc();
        break;
      }
      default: {
          // console.log('onend BUG!!!');
        break;
      }
    }
  }
  setVolume(volume) {
      // console.log(`volume is set to ${volume}`);
    this.audioElement.volume = volume;
    this.setState({ volume });
  }
  setProgress(newProgress) {
    let progress = newProgress;
    const duration = this.audioElement.duration;
    if (progress > duration) {
      progress = duration;
    }
    this.audioElement.currentTime = progress;
    this.setState({ progress });
      // console.log(`progress is set to ${progress}`);
  }
  _clearInterval() {
      // console.log('interval cleared');
    if (this.intervalId !== null) {
      clearInterval(this.intervalId);
      this.intervalId = null;
    }
  }
  loadSrc() {
      // console.log('load src');
    if (this.state.currentPlaylistPos < this.props.playlist.length) {
      this.audioElement.src = this.props.playlist[this.state.currentPlaylistPos].src;
      this.audioElement.load();
      if (this.playNext) {
        this.audioElement.play();
      }
      this.setState({ progress: 0 });
      this._clearInterval();
    }
  }
  togglePlayPause() {
      // console.log('toggle playpause');
    if (this.state.playing) {
        // console.log('togglePlayPause(): playing');
      this.audioElement.pause();
    } else if (this.audioElement.currentTime === this.audioElement.duration) {
      this.handleEndedProgress();
    } else {
      this.audioElement.play();
    }
  }
  skipToNext() {
      // console.log('skip to next');
    this.state.currentPlaylistPos = this.setCycleNumPos(this.state.currentPlaylistPos, 1, this.props.playlist.length);
    this.loadSrc();
  }
  skipToPrevious() {
      // console.log('skip to next');
    this.state.currentPlaylistPos = this.setCycleNumPos(this.state.currentPlaylistPos, -1, this.props.playlist.length);
    this.loadSrc();
  }
  togglePlayingState() {
    this.setState({
      playingState: this.setCycleNumPos(this.state.playingState, 1, 3)
    });
  }
  setCycleNumPos(currentVal, change, length) {
    let newPos = currentVal + change;
    if (newPos >= length) {
      newPos -= length;
    }
    if (newPos < 0) {
      newPos += length;
    }
    return newPos;
  }
  render() {
    const newProps = Object.assign({}, {
      name: this.props.playlist[this.state.currentPlaylistPos].name,
      CommentsWrapperStates: {
        songImageSrc: this.props.playlist[this.state.currentPlaylistPos].img,
        comments: (this.props.fullPlayer && this.props.comment) ? this.props.playlist[this.state.currentPlaylistPos].comments : null,
        pos: this.state.currentPlaylistPos
      },
      controlStates: {
        playing: this.state.playing,
        playingState: this.state.playingState,
        volume: this.state.volume * 100
      },
      controlCallbacks: {
        setVolume: this.setVolume,
        togglePlayPause: this.togglePlayPause,
        togglePlayingState: this.togglePlayingState,
        skipToNext: this.skipToNext,
        skipToPrevious: this.skipToPrevious
      },
      timelineStates: {
        playing: this.state.playing,
        progress: this.state.progress,
        duration: this.state.duration
      },
      timelineCallbacks: {
        setProgress: this.setProgress,
        togglePlayPause: this.togglePlayPause
      },
      children: this.props.children
    }, this.props);
    return <Audio {...newProps} />;
  }

  playEventHandler() {
    this.audioElement.play();
  }

  pauseEventHandler() {
    this.audioElement.pause();
  }

  skipToNextEventHandler() {
    this.skipToNext();
  }

  skipToPreviousEventHandler() {
    this.skipToPrevious();
  }

  componentDidMount() {
      // console.log('Audio mounted!');
      // set audio element event listeners
    console.log(this);
    this.audioElement = document.createElement('audio');
    this.audioElement.addEventListener('canplay', this.onCanPlay);
    this.audioElement.addEventListener('ended', this.onEnded);
    this.audioElement.addEventListener('play', this.onPlay);
    this.audioElement.addEventListener('pause', this.onPause);
    this.audioElement.addEventListener('volumechange', this.onVolumeChange);

    this.loadSrc();
    this.setState({ volume: this.audioElement.volume });

    ReactDOM.findDOMNode(this).addEventListener('audio-play', this.playEventHandler);
    ReactDOM.findDOMNode(this).addEventListener('audio-pause', this.pauseEventHandler);
    ReactDOM.findDOMNode(this).addEventListener('audio-skip-to-next', this.skipToNextEventHandler);
    ReactDOM.findDOMNode(this).addEventListener('audio-skip-to-previous', this.skipToPreviousEventHandler);
  }

  componentWillUnmount() {
    this._clearInterval();
    this.audioElement.removeEventListener('canplay', this.onCanPlay);
    this.audioElement.removeEventListener('ended', this.onEnded);
    this.audioElement.removeEventListener('play', this.onPlay);
    this.audioElement.removeEventListener('pause', this.onPause);
    this.audioElement.removeEventListener('volumechange', this.onVolumeChange);
    this.audioElement = null;

    ReactDOM.findDOMNode(this).removeEventListener('audio-play', this.playEventHandler);
    ReactDOM.findDOMNode(this).removeEventListener('audio-pause', this.pauseEventHandler);
    ReactDOM.findDOMNode(this).removeEventListener('audio-skip-to-next', this.skipToNextEventHandler);
    ReactDOM.findDOMNode(this).removeEventListener('audio-skip-to-previous', this.skipToPreviousEventHandler);
  }
  };

export default HOCAudio;