import { Component, ElementRef, NgZone, OnDestroy, OnInit, ViewChild } from '@angular/core';
import { ActivatedRoute, Router } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { Subscription } from 'rxjs/Subscription';

import * as videojs from 'video.js';
import { MetaService } from '@nglibs/meta';
import { NotificationsService } from 'angular2-notifications';

import { AuthService, ConfirmService } from '../../core';
import { VideoMagnetComponent } from './video-magnet.component';
import { VideoShareComponent } from './video-share.component';
import { VideoReportComponent } from './video-report.component';
import { RateType, Video, VideoService } from '../shared';
import { WebTorrentService } from './webtorrent.service';

@Component({
  selector: 'my-video-watch',
  templateUrl: './video-watch.component.html',
  styleUrls: [ './video-watch.component.scss' ]
})

export class VideoWatchComponent implements OnInit, OnDestroy {
  private static LOADTIME_TOO_LONG: number = 20000;

  @ViewChild('videoMagnetModal') videoMagnetModal: VideoMagnetComponent;
  @ViewChild('videoShareModal') videoShareModal: VideoShareComponent;
  @ViewChild('videoReportModal') videoReportModal: VideoReportComponent;

  downloadSpeed: number;
  error: boolean = false;
  loading: boolean = false;
  numPeers: number;
  player: VideoJSPlayer;
  playerElement: Element;
  uploadSpeed: number;
  userRating: RateType = null;
  video: Video = null;
  videoNotFound = false;

  private errorTimer: number;
  private paramsSub: Subscription;
  private errorsSub: Subscription;
  private warningsSub: Subscription;
  private torrentInfosInterval: number;

  constructor(
    private elementRef: ElementRef,
    private ngZone: NgZone,
    private route: ActivatedRoute,
    private router: Router,
    private videoService: VideoService,
    private confirmService: ConfirmService,
    private metaService: MetaService,
    private webTorrentService: WebTorrentService,
    private authService: AuthService,
    private notificationsService: NotificationsService
  ) {}

  ngOnInit() {
    this.paramsSub = this.route.params.subscribe(routeParams => {
      let id = routeParams['id'];
      this.videoService.getVideo(id).subscribe(
        video => this.onVideoFetched(video),

        error => this.videoNotFound = true
      );
    });

    this.playerElement = this.elementRef.nativeElement.querySelector('#video-container');

    const videojsOptions = {
      controls: true,
      autoplay: false
    };

    const self = this;
    videojs(this.playerElement, videojsOptions, function () {
      self.player = this;
    });

    this.errorsSub = this.webTorrentService.errors.subscribe(err => this.notificationsService.error('Error', err.message));
    this.warningsSub = this.webTorrentService.errors.subscribe(err => this.notificationsService.alert('Warning', err.message));
  }

  ngOnDestroy() {
    // Remove WebTorrent stuff
    console.log('Removing video from webtorrent.');
    window.clearInterval(this.torrentInfosInterval);
    window.clearTimeout(this.errorTimer);

    if (this.video !== null && this.webTorrentService.has(this.video.magnetUri)) {
      this.webTorrentService.remove(this.video.magnetUri);
    }

    // Remove player
    videojs(this.playerElement).dispose();

    // Unsubscribe subscriptions
    this.paramsSub.unsubscribe();
    this.errorsSub.unsubscribe();
    this.warningsSub.unsubscribe();
  }

  loadVideo() {
    // Reset the error
    this.error = false;
    // We are loading the video
    this.loading = true;

    console.log('Adding ' + this.video.magnetUri + '.');

    // The callback might never return if there are network issues
    // So we create a timer to inform the user the load is abnormally long
    this.errorTimer = window.setTimeout(() => this.loadTooLong(), VideoWatchComponent.LOADTIME_TOO_LONG);

    this.webTorrentService.add(this.video.magnetUri, (torrent) => {
      // Clear the error timer
      window.clearTimeout(this.errorTimer);
      // Maybe the error was fired by the timer, so reset it
      this.error = false;

      // We are not loading the video anymore
      this.loading = false;

      console.log('Added ' + this.video.magnetUri + '.');
      torrent.files[0].renderTo(this.playerElement, { autoplay: true }, (err) => {
        if (err) {
          this.notificationsService.error('Error', 'Cannot append the file in the video element.');
          console.error(err);
        }
      });

      this.runInProgress(torrent);
    });
  }

  setLike() {
    if (this.isUserLoggedIn() === false) return;
    // Already liked this video
    if (this.userRating === 'like') return;

    this.videoService.setVideoLike(this.video.id)
                     .subscribe(
                      () => {
                        // Update the video like attribute
                        this.updateVideoRating(this.userRating, 'like');
                        this.userRating = 'like';
                      },

                      err => this.notificationsService.error('Error', err.text)
                     );
  }

  setDislike() {
    if (this.isUserLoggedIn() === false) return;
    // Already disliked this video
    if (this.userRating === 'dislike') return;

    this.videoService.setVideoDislike(this.video.id)
                     .subscribe(
                      () => {
                        // Update the video dislike attribute
                        this.updateVideoRating(this.userRating, 'dislike');
                        this.userRating = 'dislike';
                      },

                      err => this.notificationsService.error('Error', err.text)
                     );
  }

  showReportModal(event: Event) {
    event.preventDefault();
    this.videoReportModal.show();
  }

  showShareModal() {
    this.videoShareModal.show();
  }

  showMagnetUriModal(event: Event) {
    event.preventDefault();
    this.videoMagnetModal.show();
  }

  isUserLoggedIn() {
    return this.authService.isLoggedIn();
  }

  canUserUpdateVideo() {
    return this.authService.getUser() !== null &&
           this.authService.getUser().username === this.video.author;
  }

  private checkUserRating() {
    // Unlogged users do not have ratings
    if (this.isUserLoggedIn() === false) return;

    this.videoService.getUserVideoRating(this.video.id)
                     .subscribe(
                       ratingObject => {
                         if (ratingObject) {
                           this.userRating = ratingObject.rating;
                         }
                       },

                       err => this.notificationsService.error('Error', err.text)
                      );
  }

  private onVideoFetched(video: Video) {
    this.video = video;

    let observable;
    if (this.video.isVideoNSFWForUser(this.authService.getUser())) {
      observable = this.confirmService.confirm('This video is not safe for work. Are you sure you want to watch it?', 'NSFW');
    } else {
      observable = Observable.of(true);
    }

    observable.subscribe(
      res => {
        if (res === false) {
          return this.router.navigate([ '/videos/list' ]);
        }

        this.setOpenGraphTags();
        this.loadVideo();
        this.checkUserRating();
      }
    );
  }

  private updateVideoRating(oldRating: RateType, newRating: RateType) {
    let likesToIncrement = 0;
    let dislikesToIncrement = 0;

    if (oldRating) {
      if (oldRating === 'like') likesToIncrement--;
      if (oldRating === 'dislike') dislikesToIncrement--;
    }

    if (newRating === 'like') likesToIncrement++;
    if (newRating === 'dislike') dislikesToIncrement++;

    this.video.likes += likesToIncrement;
    this.video.dislikes += dislikesToIncrement;
  }

  private loadTooLong() {
    this.error = true;
    console.error('The video load seems to be abnormally long.');
  }

  private setOpenGraphTags() {
    this.metaService.setTitle(this.video.name);

    this.metaService.setTag('og:type', 'video');

    this.metaService.setTag('og:title', this.video.name);
    this.metaService.setTag('name', this.video.name);

    this.metaService.setTag('og:description', this.video.description);
    this.metaService.setTag('description', this.video.description);

    this.metaService.setTag('og:image', this.video.thumbnailPath);

    this.metaService.setTag('og:duration', this.video.duration);

    this.metaService.setTag('og:site_name', 'PeerTube');

    this.metaService.setTag('og:url', window.location.href);
    this.metaService.setTag('url', window.location.href);
  }

  private runInProgress(torrent: any) {
    // Refresh each second
    this.torrentInfosInterval = window.setInterval(() => {
      this.ngZone.run(() => {
        this.downloadSpeed = torrent.downloadSpeed;
        this.numPeers = torrent.numPeers;
        this.uploadSpeed = torrent.uploadSpeed;
      });
    }, 1000);
  }
}