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import { OnDestroy, OnInit } from '@angular/core'
import { ActivatedRoute, Router } from '@angular/router'
import { Subscription } from 'rxjs/Subscription'
import { BehaviorSubject } from 'rxjs/BehaviorSubject'
import { Observable } from 'rxjs/Observable'
import { NotificationsService } from 'angular2-notifications'
import {
SortField,
Video,
VideoPagination
} from '../../shared'
export abstract class AbstractVideoList implements OnInit, OnDestroy {
loading: BehaviorSubject<boolean> = new BehaviorSubject(false)
pagination: VideoPagination = {
currentPage: 1,
itemsPerPage: 25,
totalItems: null
}
sort: SortField
videos: Video[] = []
protected notificationsService: NotificationsService
protected router: Router
protected route: ActivatedRoute
protected subActivatedRoute: Subscription
abstract getVideosObservable (): Observable<{ videos: Video[], totalVideos: number}>
ngOnInit () {
// Subscribe to route changes
this.subActivatedRoute = this.route.params.subscribe(routeParams => {
this.loadRouteParams(routeParams)
this.getVideos()
})
}
ngOnDestroy () {
this.subActivatedRoute.unsubscribe()
}
getVideos () {
this.loading.next(true)
this.videos = []
const observable = this.getVideosObservable()
observable.subscribe(
({ videos, totalVideos }) => {
this.videos = videos
this.pagination.totalItems = totalVideos
this.loading.next(false)
},
error => this.notificationsService.error('Error', error.text)
)
}
isThereNoVideo () {
return !this.loading.getValue() && this.videos.length === 0
}
onPageChanged (event: { page: number }) {
// Be sure the current page is set
this.pagination.currentPage = event.page
this.navigateToNewParams()
}
onSort (sort: SortField) {
this.sort = sort
this.navigateToNewParams()
}
protected buildRouteParams () {
// There is always a sort and a current page
const params = {
sort: this.sort,
page: this.pagination.currentPage
}
return params
}
protected loadRouteParams (routeParams: { [ key: string ]: any }) {
this.sort = routeParams['sort'] as SortField || '-createdAt'
if (routeParams['page'] !== undefined) {
this.pagination.currentPage = parseInt(routeParams['page'], 10)
} else {
this.pagination.currentPage = 1
}
}
protected navigateToNewParams () {
const routeParams = this.buildRouteParams()
this.router.navigate([ '/videos/list', routeParams ])
}
}
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