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f3aaa9a9 | 1 | import { OnInit } from '@angular/core' |
fd45e8f4 | 2 | import { ActivatedRoute, Router } from '@angular/router' |
fd45e8f4 | 3 | import { NotificationsService } from 'angular2-notifications' |
9bf9d2a5 | 4 | import { Observable } from 'rxjs/Observable' |
b2731bff | 5 | import { AuthService } from '../../core/auth' |
4635f59d | 6 | import { ComponentPagination } from '../rest/component-pagination.model' |
202f6b6c | 7 | import { SortField } from './sort-field.type' |
202f6b6c | 8 | import { Video } from './video.model' |
fd45e8f4 | 9 | |
f3aaa9a9 | 10 | export abstract class AbstractVideoList implements OnInit { |
4635f59d | 11 | pagination: ComponentPagination = { |
fd45e8f4 | 12 | currentPage: 1, |
6f6cdef7 | 13 | itemsPerPage: 25, |
fd45e8f4 C |
14 | totalItems: null |
15 | } | |
9bf9d2a5 | 16 | sort: SortField = '-createdAt' |
f3aaa9a9 | 17 | defaultSort: SortField = '-createdAt' |
fd45e8f4 | 18 | videos: Video[] = [] |
f3aaa9a9 | 19 | loadOnInit = true |
fd45e8f4 | 20 | |
b2731bff C |
21 | protected abstract notificationsService: NotificationsService |
22 | protected abstract authService: AuthService | |
23 | protected abstract router: Router | |
24 | protected abstract route: ActivatedRoute | |
fd45e8f4 | 25 | |
2bbb3412 C |
26 | protected abstract currentRoute: string |
27 | ||
9bf9d2a5 | 28 | abstract titlePage: string |
c88593f7 C |
29 | |
30 | protected otherParams = {} | |
31 | ||
2bbb3412 C |
32 | private loadedPages: { [ id: number ]: boolean } = {} |
33 | ||
fd45e8f4 C |
34 | abstract getVideosObservable (): Observable<{ videos: Video[], totalVideos: number}> |
35 | ||
b2731bff C |
36 | get user () { |
37 | return this.authService.getUser() | |
38 | } | |
39 | ||
fd45e8f4 C |
40 | ngOnInit () { |
41 | // Subscribe to route changes | |
2bbb3412 C |
42 | const routeParams = this.route.snapshot.params |
43 | this.loadRouteParams(routeParams) | |
a2b817d3 | 44 | |
f3aaa9a9 | 45 | if (this.loadOnInit === true) this.loadMoreVideos('after') |
fd45e8f4 C |
46 | } |
47 | ||
2bbb3412 C |
48 | onNearOfTop () { |
49 | if (this.pagination.currentPage > 1) { | |
50 | this.previousPage() | |
51 | } | |
52 | } | |
53 | ||
54 | onNearOfBottom () { | |
55 | if (this.hasMoreVideos()) { | |
56 | this.nextPage() | |
57 | } | |
58 | } | |
59 | ||
f3aaa9a9 C |
60 | reloadVideos () { |
61 | this.videos = [] | |
62 | this.loadedPages = {} | |
63 | this.loadMoreVideos('before') | |
64 | } | |
65 | ||
2bbb3412 C |
66 | loadMoreVideos (where: 'before' | 'after') { |
67 | if (this.loadedPages[this.pagination.currentPage] === true) return | |
fd45e8f4 C |
68 | |
69 | const observable = this.getVideosObservable() | |
70 | ||
71 | observable.subscribe( | |
72 | ({ videos, totalVideos }) => { | |
a2b817d3 | 73 | // Paging is too high, return to the first one |
f595d394 | 74 | if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) { |
a2b817d3 C |
75 | this.pagination.currentPage = 1 |
76 | this.setNewRouteParams() | |
77 | return this.reloadVideos() | |
78 | } | |
79 | ||
2bbb3412 | 80 | this.loadedPages[this.pagination.currentPage] = true |
fd45e8f4 | 81 | this.pagination.totalItems = totalVideos |
2bbb3412 C |
82 | |
83 | if (where === 'before') { | |
84 | this.videos = videos.concat(this.videos) | |
85 | } else { | |
86 | this.videos = this.videos.concat(videos) | |
87 | } | |
fd45e8f4 | 88 | }, |
c5911fd3 | 89 | error => this.notificationsService.error('Error', error.message) |
fd45e8f4 C |
90 | ) |
91 | } | |
92 | ||
2bbb3412 | 93 | protected hasMoreVideos () { |
f595d394 C |
94 | // No results |
95 | if (this.pagination.totalItems === 0) return false | |
96 | ||
97 | // Not loaded yet | |
2bbb3412 C |
98 | if (!this.pagination.totalItems) return true |
99 | ||
202f6b6c | 100 | const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage |
2bbb3412 C |
101 | return maxPage > this.pagination.currentPage |
102 | } | |
103 | ||
104 | protected previousPage () { | |
105 | this.pagination.currentPage-- | |
106 | ||
107 | this.setNewRouteParams() | |
108 | this.loadMoreVideos('before') | |
109 | } | |
110 | ||
111 | protected nextPage () { | |
112 | this.pagination.currentPage++ | |
fd45e8f4 | 113 | |
2bbb3412 C |
114 | this.setNewRouteParams() |
115 | this.loadMoreVideos('after') | |
fd45e8f4 C |
116 | } |
117 | ||
fd45e8f4 C |
118 | protected buildRouteParams () { |
119 | // There is always a sort and a current page | |
120 | const params = { | |
121 | sort: this.sort, | |
122 | page: this.pagination.currentPage | |
123 | } | |
124 | ||
c88593f7 | 125 | return Object.assign(params, this.otherParams) |
fd45e8f4 C |
126 | } |
127 | ||
128 | protected loadRouteParams (routeParams: { [ key: string ]: any }) { | |
f3aaa9a9 | 129 | this.sort = routeParams['sort'] as SortField || this.defaultSort |
fd45e8f4 C |
130 | |
131 | if (routeParams['page'] !== undefined) { | |
132 | this.pagination.currentPage = parseInt(routeParams['page'], 10) | |
133 | } else { | |
134 | this.pagination.currentPage = 1 | |
135 | } | |
136 | } | |
137 | ||
2bbb3412 | 138 | protected setNewRouteParams () { |
fd45e8f4 | 139 | const routeParams = this.buildRouteParams() |
2bbb3412 | 140 | this.router.navigate([ this.currentRoute, routeParams ]) |
fd45e8f4 C |
141 | } |
142 | } |