/*
 * Buffer Controller
 */
/* eslint-disable */
import Event from '../events';
import EventHandler from '../event-handler';

class BufferController extends EventHandler {
  constructor(wfs) {
    super(
      wfs,
      Event.MEDIA_ATTACHING,
      Event.BUFFER_APPENDING,
      Event.BUFFER_RESET
    );

    this.mediaSource = null;
    this.media = null;
    this.pendingTracks = {};
    this.sourceBuffer = {};
    this.segments = [];

    this.appended = 0;
    this._msDuration = null;

    // Source Buffer listeners
    this.onsbue = this.onSBUpdateEnd.bind(this);

    this.browserType = 0;
    if (navigator.userAgent.toLowerCase().indexOf('firefox') !== -1) {
      this.browserType = 1;
    }
    this.mediaType = 'H264Raw';

    this.websocketName = undefined;
    this.channelName = undefined;
    this.cameraInfo = {};
  }

  destroy() {
    EventHandler.prototype.destroy.call(this);
  }

  onMediaAttaching(data) {
    let media = (this.media = data.media);
    this.mediaType = data.mediaType;
    this.websocketName = data.websocketName;
    this.channelName = data.channelName;
    this.cameraInfo = data.cameraInfo;
    if (media) {
      // setup the media source
      var ms = (this.mediaSource = new MediaSource());
      //Media Source listeners
      this.onmso = this.onMediaSourceOpen.bind(this);
      this.onmse = this.onMediaSourceEnded.bind(this);
      this.onmsc = this.onMediaSourceClose.bind(this);
      ms.addEventListener('sourceopen', this.onmso);
      ms.addEventListener('sourceended', this.onmse);
      ms.addEventListener('sourceclose', this.onmsc);
      // link video and media Source
      media.src = URL.createObjectURL(ms);
    }
  }

  onMediaDetaching() {}

  onBufferAppending(data) {
    if (!this.segments) {
      this.segments = [data];
    } else {
      this.segments.push(data);
    }
    this.doAppending();
  }

  onMediaSourceClose() {
    console.log('media source closed');
  }

  onMediaSourceEnded() {
    console.log('media source ended');
  }

  onSBUpdateEnd(event) {
    // Firefox
    if (this.browserType === 1) {
      this.mediaSource.endOfStream();
      this.media.play();
    }

    this.appending = false;
    this.doAppending();
    this.updateMediaElementDuration();
  }

  updateMediaElementDuration() {}

  onMediaSourceOpen() {
    let mediaSource = this.mediaSource;
    if (mediaSource) {
      // once received, don't listen anymore to sourceopen event
      mediaSource.removeEventListener('sourceopen', this.onmso);
    }

    if (this.mediaType === 'FMp4') {
      this.checkPendingTracks();
    }

    this.wfs.trigger(Event.MEDIA_ATTACHED, {
      media: this.media,
      channelName: this.channelName,
      mediaType: this.mediaType,
      websocketName: this.websocketName,
      cameraInfo: this.cameraInfo
    });
  }

  checkPendingTracks() {
    this.createSourceBuffers({ tracks: 'video', mimeType: '' });
    this.pendingTracks = {};
  }

  onBufferReset(data) {
    if (this.mediaType === 'H264Raw') {
      this.createSourceBuffers({ tracks: 'video', mimeType: data.mimeType });
    }
  }

  createSourceBuffers(tracks) {
    var sourceBuffer = this.sourceBuffer,
      mediaSource = this.mediaSource;
    let mimeType;
    if (tracks.mimeType === '') {
      mimeType = 'video/mp4;codecs=avc1.420028'; // avc1.42c01f avc1.42801e avc1.640028 avc1.420028
    } else {
      mimeType = 'video/mp4;codecs=' + tracks.mimeType;
    }

    try {
      let sb = (sourceBuffer['video'] = mediaSource.addSourceBuffer(mimeType));
      sb.addEventListener('updateend', this.onsbue);
      track.buffer = sb;
    } catch (err) {}
    this.wfs.trigger(Event.BUFFER_CREATED, { tracks: tracks });
    this.media.play();
  }

  doAppending() {
    var wfs = this.wfs,
      sourceBuffer = this.sourceBuffer,
      segments = this.segments;
    if (Object.keys(sourceBuffer).length) {
      if (this.media.error) {
        this.segments = [];
        console.log(
          'trying to append although a media error occured, flush segment and abort'
        );
        return;
      }
      if (this.appending) {
        return;
      }

      if (segments && segments.length) {
        var segment = segments.shift();
        try {
          if (sourceBuffer[segment.type]) {
            this.parent = segment.parent;
            sourceBuffer[segment.type].appendBuffer(segment.data);
            this.appendError = 0;
            this.appended++;
            this.appending = true;
          } else {
          }
        } catch (err) {
          // in case any error occured while appending, put back segment in segments table
          segments.unshift(segment);
          var event = { type: ErrorTypes.MEDIA_ERROR };
          if (err.code !== 22) {
            if (this.appendError) {
              this.appendError++;
            } else {
              this.appendError = 1;
            }
            event.details = ErrorDetails.BUFFER_APPEND_ERROR;
            event.frag = this.fragCurrent;
            if (this.appendError > wfs.config.appendErrorMaxRetry) {
              segments = [];
              event.fatal = true;
              return;
            } else {
              event.fatal = false;
            }
          } else {
            this.segments = [];
            event.details = ErrorDetails.BUFFER_FULL_ERROR;
            return;
          }
        }
      }
    }
  }
}

export default BufferController;