import { concat, Observable } from 'rxjs'
import { tap, toArray } from 'rxjs/operators'
import { Component, OnInit, ViewChild } from '@angular/core'
import { ActivatedRoute, Router } from '@angular/router'
import { AuthService, ComponentPagination, ConfirmService, Notifier, ScreenService, ServerService, User } from '@app/core'
import { DisableForReuseHook } from '@app/core/routing/disable-for-reuse-hook'
import { immutableAssign } from '@app/helpers'
import { AdvancedInputFilter } from '@app/shared/shared-forms'
import { DropdownAction, Video, VideoService } from '@app/shared/shared-main'
import { LiveStreamInformationComponent } from '@app/shared/shared-video-live'
import { MiniatureDisplayOptions, SelectionType, VideosSelectionComponent } from '@app/shared/shared-video-miniature'
import { VideoChannel, VideoSortField } from '@shared/models'
import { VideoChangeOwnershipComponent } from './modals/video-change-ownership.component'

@Component({
  templateUrl: './my-videos.component.html',
  styleUrls: [ './my-videos.component.scss' ]
})
export class MyVideosComponent implements OnInit, DisableForReuseHook {
  @ViewChild('videosSelection', { static: true }) videosSelection: VideosSelectionComponent
  @ViewChild('videoChangeOwnershipModal', { static: true }) videoChangeOwnershipModal: VideoChangeOwnershipComponent
  @ViewChild('liveStreamInformationModal', { static: true }) liveStreamInformationModal: LiveStreamInformationComponent

  titlePage: string
  selection: SelectionType = {}
  pagination: ComponentPagination = {
    currentPage: 1,
    itemsPerPage: 10,
    totalItems: null
  }
  miniatureDisplayOptions: MiniatureDisplayOptions = {
    date: true,
    views: true,
    by: true,
    privacyLabel: false,
    privacyText: true,
    state: true,
    blacklistInfo: true
  }

  videoActions: DropdownAction<{ video: Video }>[] = []

  videos: Video[] = []
  getVideosObservableFunction = this.getVideosObservable.bind(this)

  sort: VideoSortField = '-publishedAt'

  user: User

  inputFilters: AdvancedInputFilter[]

  disabled = false

  private search: string
  private userChannels: VideoChannel[] = []

  constructor (
    protected router: Router,
    protected serverService: ServerService,
    protected route: ActivatedRoute,
    protected authService: AuthService,
    protected notifier: Notifier,
    protected screenService: ScreenService,
    private confirmService: ConfirmService,
    private videoService: VideoService
  ) {
    this.titlePage = $localize`My videos`
  }

  ngOnInit () {
    this.buildActions()

    this.user = this.authService.getUser()

    if (this.route.snapshot.queryParams['search']) {
      this.search = this.route.snapshot.queryParams['search']
    }

    this.authService.userInformationLoaded.subscribe(() => {
      this.user = this.authService.getUser()
      this.userChannels = this.user.videoChannels

      const channelFilters = this.userChannels.map(c => {
        return {
          queryParams: { search: 'channel:' + c.name },
          label: c.name
        }
      })

      this.inputFilters = [
        {
          title: $localize`Advanced filters`,
          children: [
            {
              queryParams: { search: 'isLive:true' },
              label: $localize`Only live videos`
            }
          ]
        },

        {
          title: $localize`Channel filters`,
          children: channelFilters
        }
      ]
    })
  }

  onSearch (search: string) {
    this.search = search
    this.reloadData()
  }

  reloadData () {
    this.videosSelection.reloadVideos()
  }

  onChangeSortColumn () {
    this.videosSelection.reloadVideos()
  }

  disableForReuse () {
    this.disabled = true
  }

  enabledForReuse () {
    this.disabled = false
  }

  getVideosObservable (page: number) {
    const newPagination = immutableAssign(this.pagination, { currentPage: page })

    return this.videoService.getMyVideos({
      videoPagination: newPagination,
      sort: this.sort,
      userChannels: this.userChannels,
      search: this.search
    })
      .pipe(
        tap(res => this.pagination.totalItems = res.total)
      )
  }

  async deleteSelectedVideos () {
    const toDeleteVideosIds = Object.keys(this.selection)
                                    .filter(k => this.selection[k] === true)
                                    .map(k => parseInt(k, 10))

    const res = await this.confirmService.confirm(
      $localize`Do you really want to delete ${toDeleteVideosIds.length} videos?`,
      $localize`Delete`
    )
    if (res === false) return

    const observables: Observable<any>[] = []
    for (const videoId of toDeleteVideosIds) {
      const o = this.videoService.removeVideo(videoId)
                    .pipe(tap(() => this.removeVideoFromArray(videoId)))

      observables.push(o)
    }

    concat(...observables)
      .pipe(toArray())
      .subscribe({
        next: () => {
          this.notifier.success($localize`${toDeleteVideosIds.length} videos deleted.`)
          this.selection = {}
        },

        error: err => this.notifier.error(err.message)
      })
  }

  async deleteVideo (video: Video) {
    const res = await this.confirmService.confirm(
      $localize`Do you really want to delete ${video.name}?`,
      $localize`Delete`
    )
    if (res === false) return

    this.videoService.removeVideo(video.id)
        .subscribe({
          next: () => {
            this.notifier.success($localize`Video ${video.name} deleted.`)
            this.removeVideoFromArray(video.id)
          },

          error: err => this.notifier.error(err.message)
        })
  }

  changeOwnership (video: Video) {
    this.videoChangeOwnershipModal.show(video)
  }

  displayLiveInformation (video: Video) {
    this.liveStreamInformationModal.show(video)
  }

  private removeVideoFromArray (id: number) {
    this.videos = this.videos.filter(v => v.id !== id)
  }

  private buildActions () {
    this.videoActions = [
      {
        label: $localize`Display live information`,
        handler: ({ video }) => this.displayLiveInformation(video),
        isDisplayed: ({ video }) => video.isLive,
        iconName: 'live'
      },
      {
        label: $localize`Change ownership`,
        handler: ({ video }) => this.changeOwnership(video),
        iconName: 'ownership-change'
      },
      {
        label: $localize`Delete`,
        handler: ({ video }) => this.deleteVideo(video),
        iconName: 'delete'
      }
    ]
  }
}