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1 | import { OnInit } from '@angular/core' | |
2 | import { ActivatedRoute, Router } from '@angular/router' | |
3 | import { NotificationsService } from 'angular2-notifications' | |
4 | import { Observable } from 'rxjs/Observable' | |
5 | import { SortField } from './sort-field.type' | |
6 | import { VideoPagination } from './video-pagination.model' | |
7 | import { Video } from './video.model' | |
8 | ||
9 | export abstract class AbstractVideoList implements OnInit { | |
10 | pagination: VideoPagination = { | |
11 | currentPage: 1, | |
12 | itemsPerPage: 25, | |
13 | totalItems: null | |
14 | } | |
15 | sort: SortField = '-createdAt' | |
16 | defaultSort: SortField = '-createdAt' | |
17 | videos: Video[] = [] | |
18 | loadOnInit = true | |
19 | ||
20 | protected notificationsService: NotificationsService | |
21 | protected router: Router | |
22 | protected route: ActivatedRoute | |
23 | ||
24 | protected abstract currentRoute: string | |
25 | ||
26 | abstract titlePage: string | |
27 | private loadedPages: { [ id: number ]: boolean } = {} | |
28 | ||
29 | abstract getVideosObservable (): Observable<{ videos: Video[], totalVideos: number}> | |
30 | ||
31 | ngOnInit () { | |
32 | // Subscribe to route changes | |
33 | const routeParams = this.route.snapshot.params | |
34 | this.loadRouteParams(routeParams) | |
35 | ||
36 | if (this.loadOnInit === true) this.loadMoreVideos('after') | |
37 | } | |
38 | ||
39 | onNearOfTop () { | |
40 | if (this.pagination.currentPage > 1) { | |
41 | this.previousPage() | |
42 | } | |
43 | } | |
44 | ||
45 | onNearOfBottom () { | |
46 | if (this.hasMoreVideos()) { | |
47 | this.nextPage() | |
48 | } | |
49 | } | |
50 | ||
51 | reloadVideos () { | |
52 | this.videos = [] | |
53 | this.loadedPages = {} | |
54 | this.loadMoreVideos('before') | |
55 | } | |
56 | ||
57 | loadMoreVideos (where: 'before' | 'after') { | |
58 | if (this.loadedPages[this.pagination.currentPage] === true) return | |
59 | ||
60 | const observable = this.getVideosObservable() | |
61 | ||
62 | observable.subscribe( | |
63 | ({ videos, totalVideos }) => { | |
64 | // Paging is too high, return to the first one | |
65 | if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) { | |
66 | this.pagination.currentPage = 1 | |
67 | this.setNewRouteParams() | |
68 | return this.reloadVideos() | |
69 | } | |
70 | ||
71 | this.loadedPages[this.pagination.currentPage] = true | |
72 | this.pagination.totalItems = totalVideos | |
73 | ||
74 | if (where === 'before') { | |
75 | this.videos = videos.concat(this.videos) | |
76 | } else { | |
77 | this.videos = this.videos.concat(videos) | |
78 | } | |
79 | }, | |
80 | error => this.notificationsService.error('Error', error.text) | |
81 | ) | |
82 | } | |
83 | ||
84 | protected hasMoreVideos () { | |
85 | // No results | |
86 | if (this.pagination.totalItems === 0) return false | |
87 | ||
88 | // Not loaded yet | |
89 | if (!this.pagination.totalItems) return true | |
90 | ||
91 | const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage | |
92 | return maxPage > this.pagination.currentPage | |
93 | } | |
94 | ||
95 | protected previousPage () { | |
96 | this.pagination.currentPage-- | |
97 | ||
98 | this.setNewRouteParams() | |
99 | this.loadMoreVideos('before') | |
100 | } | |
101 | ||
102 | protected nextPage () { | |
103 | this.pagination.currentPage++ | |
104 | ||
105 | this.setNewRouteParams() | |
106 | this.loadMoreVideos('after') | |
107 | } | |
108 | ||
109 | protected buildRouteParams () { | |
110 | // There is always a sort and a current page | |
111 | const params = { | |
112 | sort: this.sort, | |
113 | page: this.pagination.currentPage | |
114 | } | |
115 | ||
116 | return params | |
117 | } | |
118 | ||
119 | protected loadRouteParams (routeParams: { [ key: string ]: any }) { | |
120 | this.sort = routeParams['sort'] as SortField || this.defaultSort | |
121 | ||
122 | if (routeParams['page'] !== undefined) { | |
123 | this.pagination.currentPage = parseInt(routeParams['page'], 10) | |
124 | } else { | |
125 | this.pagination.currentPage = 1 | |
126 | } | |
127 | } | |
128 | ||
129 | protected setNewRouteParams () { | |
130 | const routeParams = this.buildRouteParams() | |
131 | this.router.navigate([ this.currentRoute, routeParams ]) | |
132 | } | |
133 | } |