// @flow
import 'videojs-contrib-ads'; // must be loaded in this order
import 'videojs-ima'; // loads directly after contrib-ads
import 'video.js/dist/alt/video-js-cdn.min.css';
import './plugins/videojs-mobile-ui/plugin';
import '@silvermine/videojs-chromecast/dist/silvermine-videojs-chromecast.css';
import * as ICONS from 'constants/icons';
import * as OVERLAY from './overlays';
import Button from 'component/button';
import classnames from 'classnames';
import events from './videojs-events';
import eventTracking from 'videojs-event-tracking';
import functions from './videojs-functions';
import hlsQualitySelector from './plugins/videojs-hls-quality-selector/plugin';
import keyboardShorcuts from './videojs-keyboard-shortcuts';
import LbryVolumeBarClass from './lbry-volume-bar';
import Chromecast from './chromecast';
import playerjs from 'player.js';
import qualityLevels from 'videojs-contrib-quality-levels';
import React, { useEffect, useRef, useState } from 'react';
import recsys from './plugins/videojs-recsys/plugin';
// import runAds from './ads';
import videojs from 'video.js';
import { LIVESTREAM_STREAM_X_PULL, LIVESTREAM_CDN_DOMAIN, LIVESTREAM_STREAM_DOMAIN } from 'constants/livestream';
import { useIsMobile } from 'effects/use-screensize';

const canAutoplay = require('./plugins/canAutoplay');

require('@silvermine/videojs-chromecast')(videojs);

export type Player = {
  controlBar: { addChild: (string, any) => void },
  loadingSpinner: any,
  autoplay: (any) => boolean,
  chromecast: (any) => void,
  currentTime: (?number) => number,
  dispose: () => void,
  duration: () => number,
  ended: () => boolean,
  error: () => any,
  exitFullscreen: () => boolean,
  getChild: (string) => any,
  isFullscreen: () => boolean,
  mobileUi: (any) => void,
  muted: (?boolean) => boolean,
  on: (string, (any) => void) => void,
  one: (string, (any) => void) => void,
  overlay: (any) => void,
  play: () => Promise<any>,
  playbackRate: (?number) => number,
  readyState: () => number,
  requestFullscreen: () => boolean,
  userActive: (?boolean) => boolean,
  volume: (?number) => number,
};

type Props = {
  adUrl: ?string,
  allowPreRoll: ?boolean,
  autoplay: boolean,
  autoplaySetting: boolean,
  claimId: ?string,
  title: ?string,
  channelName: ?string,
  embedded: boolean,
  internalFeatureEnabled: ?boolean,
  isAudio: boolean,
  poster: ?string,
  replay: boolean,
  shareTelemetry: boolean,
  source: string,
  sourceType: string,
  startMuted: boolean,
  userId: ?number,
  videoTheaterMode: boolean,
  onPlayerReady: (Player, any) => void,
  playNext: () => void,
  playPrevious: () => void,
  toggleVideoTheaterMode: () => void,
  claimRewards: () => void,
  doAnalyticsView: (string, number) => void,
  uri: string,
  claimValues: any,
  clearPosition: (string) => void,
  centerPlayButton: () => void,
  isLivestreamClaim: boolean,
  userClaimId: ?string,
  activeLivestreamForChannel: any,
};

const videoPlaybackRates = [0.25, 0.5, 0.75, 1, 1.1, 1.25, 1.5, 1.75, 2];

const IS_IOS =
  (/iPad|iPhone|iPod/.test(navigator.platform) ||
    // for iOS 13+ , platform is MacIntel, so use this to test
    (navigator.platform === 'MacIntel' && navigator.maxTouchPoints > 1)) &&
  !window.MSStream;

if (!Object.keys(videojs.getPlugins()).includes('eventTracking')) {
  videojs.registerPlugin('eventTracking', eventTracking);
}

if (!Object.keys(videojs.getPlugins()).includes('hlsQualitySelector')) {
  videojs.registerPlugin('hlsQualitySelector', hlsQualitySelector);
}

if (!Object.keys(videojs.getPlugins()).includes('qualityLevels')) {
  videojs.registerPlugin('qualityLevels', qualityLevels);
}

if (!Object.keys(videojs.getPlugins()).includes('recsys')) {
  videojs.registerPlugin('recsys', recsys);
}

// ****************************************************************************
// VideoJs
// ****************************************************************************

/*
properties for this component should be kept to ONLY those that if changed should REQUIRE an entirely new videojs element
 */
export default React.memo<Props>(function VideoJs(props: Props) {
  const {
    // adUrl, // TODO: this ad functionality isn't used, can be pulled out
    // allowPreRoll,
    autoplay,
    autoplaySetting,
    claimId,
    title,
    channelName,
    embedded,
    // internalFeatureEnabled, // for people on the team to test new features internally
    isAudio,
    poster,
    replay,
    shareTelemetry,
    source,
    sourceType,
    startMuted,
    userId,
    videoTheaterMode,
    onPlayerReady,
    playNext,
    playPrevious,
    toggleVideoTheaterMode,
    claimValues,
    doAnalyticsView,
    claimRewards,
    uri,
    clearPosition,
    centerPlayButton,
    userClaimId,
    isLivestreamClaim,
    activeLivestreamForChannel,
  } = props;

  const isMobile = useIsMobile();

  // will later store the videojs player
  const playerRef = useRef();
  const containerRef = useRef();

  const tapToUnmuteRef = useRef();
  const tapToRetryRef = useRef();

  const playerServerRef = useRef();

  const { url: livestreamVideoUrl } = activeLivestreamForChannel || {};
  const showQualitySelector = !isLivestreamClaim || (livestreamVideoUrl && livestreamVideoUrl.includes('/transcode/'));

  // initiate keyboard shortcuts
  const { curried_function } = keyboardShorcuts({
    isMobile,
    isLivestreamClaim,
    toggleVideoTheaterMode,
    playNext,
    playPrevious,
  });

  const [reload, setReload] = useState('initial');

  const { createVideoPlayerDOM } = functions({ isAudio });

  const { unmuteAndHideHint, retryVideoAfterFailure, initializeEvents } = events({
    tapToUnmuteRef,
    tapToRetryRef,
    setReload,
    videoTheaterMode,
    playerRef,
    autoplaySetting,
    replay,
    claimValues,
    userId,
    claimId,
    embedded,
    doAnalyticsView,
    claimRewards,
    uri,
    playerServerRef,
    clearPosition,
    isLivestreamClaim,
  });

  const videoJsOptions = {
    preload: 'auto',
    playbackRates: videoPlaybackRates,
    responsive: true,
    controls: true,
    html5: {
      hls: {
        overrideNative: !videojs.browser.IS_ANY_SAFARI,
        allowSeeksWithinUnsafeLiveWindow: true,
        enableLowInitialPlaylist: false,
        handlePartialData: true,
        smoothQualityChange: true,
      },
    },
    liveTracker: {
      trackingThreshold: 0,
      liveTolerance: 10,
    },
    inactivityTimeout: 2000,
    autoplay: autoplay,
    muted: startMuted,
    poster: poster, // thumb looks bad in app, and if autoplay, flashing poster is annoying
    plugins: { eventTracking: true, overlay: OVERLAY.OVERLAY_DATA },
    // fixes problem of errant CC button showing up on iOS
    // the true fix here is to fix the m3u8 file, see: https://github.com/lbryio/lbry-desktop/pull/6315
    controlBar: {
      subsCapsButton: false,
      currentTimeDisplay: !isLivestreamClaim,
      timeDivider: !isLivestreamClaim,
      durationDisplay: !isLivestreamClaim,
      remainingTimeDisplay: !isLivestreamClaim,
    },
    techOrder: ['chromecast', 'html5'],
    chromecast: {
      requestTitleFn: (src) => title || '',
      requestSubtitleFn: (src) => channelName || '',
    },
    bigPlayButton: embedded, // only show big play button if embedded
    liveui: true,
    suppressNotSupportedError: true,
  };

  // Initialize video.js
  function initializeVideoPlayer(el, canAutoplayVideo) {
    if (!el) return;

    const vjs = videojs(el, videoJsOptions, async () => {
      const player = playerRef.current;
      const adapter = new playerjs.VideoJSAdapter(player);

      // this seems like a weird thing to have to check for here
      if (!player) return;

      // runAds(internalFeatureEnabled, allowPreRoll, player, embedded);

      initializeEvents();

      // Replace volume bar with custom LBRY volume bar
      LbryVolumeBarClass.replaceExisting(player);

      // Add reloadSourceOnError plugin
      player.reloadSourceOnError({ errorInterval: 10 });

      // Initialize mobile UI.
      player.mobileUi();

      if (!embedded) {
        window.player.bigPlayButton && window.player.bigPlayButton.hide();
      } else {
        const bigPlayButton = document.querySelector('.vjs-big-play-button');
        if (bigPlayButton) bigPlayButton.style.setProperty('display', 'block', 'important');
      }

      // Add quality selector to player
      if (showQualitySelector) player.hlsQualitySelector({ displayCurrentQuality: true });

      // Add recsys plugin
      if (shareTelemetry) {
        player.recsys({
          videoId: claimId,
          userId: userId,
          embedded: embedded,
        });
      }

      // set playsinline for mobile
      player.children_[0].setAttribute('playsinline', '');

      if (canAutoplayVideo === true) {
        // show waiting spinner as video is loading
        player.addClass('vjs-waiting');
        // document.querySelector('.vjs-big-play-button').style.setProperty('display', 'none', 'important');
      } else {
        // $FlowFixMe
        document.querySelector('.vjs-big-play-button').style.setProperty('display', 'block', 'important');
      }

      // center play button
      centerPlayButton();

      // I think this is a callback function
      const videoNode = containerRef.current && containerRef.current.querySelector('video, audio');

      onPlayerReady(player, videoNode);
      adapter.ready();

      // sometimes video doesnt start properly, this addresses the edge case
      if (autoplay) {
        const videoDiv = window.player.children_[0];
        if (videoDiv) {
          videoDiv.click();
        }
        window.player.userActive(true);
      }

      Chromecast.initialize(player);
    });

    // fixes #3498 (https://github.com/lbryio/lbry-desktop/issues/3498)
    // summary: on firefox the focus would stick to the fullscreen button which caused buggy behavior with spacebar
    vjs.on('fullscreenchange', () => document.activeElement && document.activeElement.blur());

    return vjs;
  }

  useEffect(() => {
    if (showQualitySelector) {
      // Add quality selector to player
      const player = playerRef.current;
      if (player) player.hlsQualitySelector({ displayCurrentQuality: true });
    }
  }, [showQualitySelector]);

  /** instantiate videoJS and dispose of it when done with code **/
  // This lifecycle hook is only called once (on mount), or when `isAudio` or `source` changes.
  useEffect(() => {
    (async function () {
      // test if perms to play video are available
      let canAutoplayVideo = await canAutoplay.video({ timeout: 2000, inline: true });

      canAutoplayVideo = canAutoplayVideo.result === true;

      const vjsElement = createVideoPlayerDOM(containerRef.current);

      // Initialize Video.js
      const vjsPlayer = initializeVideoPlayer(vjsElement, canAutoplayVideo);

      // Add reference to player to global scope
      window.player = vjsPlayer;

      // Set reference in component state
      playerRef.current = vjsPlayer;

      window.addEventListener('keydown', curried_function(playerRef, containerRef));

      // $FlowFixMe
      document.querySelector('.vjs-control-bar').style.setProperty('opacity', '1', 'important');

      if (isLivestreamClaim && userClaimId) {
        // $FlowFixMe
        vjsPlayer.addClass('livestreamPlayer');

        // @if process.env.NODE_ENV!='production'
        videojs.Vhs.xhr.beforeRequest = (options) => {
          if (!options.headers) options.headers = {};
          options.headers['X-Pull'] = LIVESTREAM_STREAM_X_PULL;
          options.uri = options.uri.replace(LIVESTREAM_CDN_DOMAIN, LIVESTREAM_STREAM_DOMAIN);
          return options;
        };
        // @endif

        // const newPoster = livestreamData.ThumbnailURL;

        // pretty sure it's not working
        // vjsPlayer.poster(newPoster);

        // here specifically because we don't allow rewinds at the moment
        // $FlowFixMe
        // vjsPlayer.on('play', function () {
        //   // $FlowFixMe
        //   vjsPlayer.liveTracker.seekToLiveEdge();
        // });

        // $FlowFixMe
        vjsPlayer.src({
          type: 'application/x-mpegURL',
          src: livestreamVideoUrl,
        });
      } else {
        // $FlowFixMe
        vjsPlayer.removeClass('livestreamPlayer');
        videojs.Vhs.xhr.beforeRequest = (options) => {};

        // change to m3u8 if applicable
        const response = await fetch(source, { method: 'HEAD', cache: 'no-store' });

        playerServerRef.current = response.headers.get('x-powered-by');

        if (response && response.redirected && response.url && response.url.endsWith('m3u8')) {
          // use m3u8 source
          // $FlowFixMe
          vjsPlayer.src({
            type: 'application/x-mpegURL',
            src: response.url,
          });
        } else {
          // use original mp4 source
          // $FlowFixMe
          vjsPlayer.src({
            type: sourceType,
            src: source,
          });
        }
      }

      // load video once source setup
      // $FlowFixMe
      vjsPlayer.load();

      // fix invisible vidcrunch overlay on IOS
      if (IS_IOS) {
        // ads video player
        const adsClaimDiv = document.querySelector('.ads__claim-item');

        if (adsClaimDiv) {
          // hide ad video by default
          adsClaimDiv.style.display = 'none';

          // ad containing div, we can keep part on page
          const adsClaimParentDiv = adsClaimDiv.parentNode;

          // watch parent div for when it is on viewport
          const observer = new IntersectionObserver(function (entries) {
            // when ad div parent becomes visible by 1px, show the ad video
            if (entries[0].isIntersecting === true) {
              adsClaimDiv.style.display = 'block';
            }

            observer.disconnect();
          });

          // $FlowFixMe
          observer.observe(adsClaimParentDiv);
        }
      }
    })();

    // Cleanup
    return () => {
      window.removeEventListener('keydown', curried_function);

      const player = playerRef.current;
      if (player) {
        try {
          window.cast.framework.CastContext.getInstance().getCurrentSession().endSession(false);
        } catch {}

        player.dispose();
        window.player = undefined;
      }
    };
  }, [isAudio, source, reload, userClaimId, isLivestreamClaim]);

  return (
    <div className={classnames('video-js-parent', { 'video-js-parent--ios': IS_IOS })} ref={containerRef}>
      <Button
        label={__('Tap to unmute')}
        button="link"
        icon={ICONS.VOLUME_MUTED}
        className="video-js--tap-to-unmute"
        onClick={unmuteAndHideHint}
        ref={tapToUnmuteRef}
      />
      <Button
        label={__('Retry')}
        button="link"
        icon={ICONS.REFRESH}
        className="video-js--tap-to-unmute"
        onClick={retryVideoAfterFailure}
        ref={tapToRetryRef}
      />
    </div>
  );
});