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ChangeDetectionStrategy,
ChangeDetectorRef,
Component,
forwardRef,
HostBinding,
input,
model,
OnChanges,
OnDestroy,
SimpleChanges
} from '@angular/core';
import { takeUntilDestroyed } from '@angular/core/rxjs-interop';
import { computed } from 'mobx';
import { catchError, Observable, of, Subscription, switchMap, throwError } from 'rxjs';
import { Page } from '../../model/page';
import { Ref } from '../../model/ref';
import { AdminService } from '../../service/admin.service';
import { ProxyService } from '../../service/api/proxy.service';
import { RefService } from '../../service/api/ref.service';
import { Store } from '../../store/store';
import { downloadPlaylist } from '../../util/download';
import { getTitle } from '../../util/format';
import { getExtension } from '../../util/http';
import { hasTag } from '../../util/tag';
import { LoadingComponent } from '../loading/loading.component';
import { ViewerComponent } from '../viewer/viewer.component';
@Component({
selector: 'app-playlist',
templateUrl: './playlist.component.html',
styleUrls: ['./playlist.component.scss'],
changeDetection: ChangeDetectionStrategy.Eager,
imports: [
forwardRef(() => ViewerComponent),
LoadingComponent,
],
})
export class PlaylistComponent implements OnChanges, OnDestroy {
@HostBinding('class') css = 'playlist';
ref = input<Ref | undefined>(undefined);
index = model(0);
repeat = model(true);
autoplay = model(false);
current = computed<Ref>(() => {
const sources = this.sources();
const index = this.index();
const ref = this.ref();
if (!sources || !ref) return { } as Ref;
const url = ref.sources![index];
return sources.content.find(ref => ref.url === url) || { url }
});
sources = model<Page<Ref> | undefined>(undefined);
private loading?: Subscription;
constructor(
private admin: AdminService,
private refs: RefService,
private proxy: ProxyService,
private store: Store,
private cd: ChangeDetectorRef,
) {
this.store.eventBus.events.pipe(takeUntilDestroyed()).subscribe(event => {
if (event.event === 'media' && this.ref() && this.store.eventBus.isRef(event, this.ref()!) && this.sources()?.content.length) {
const mediaList = [];
for (const s of this.sources()!.content) {
const file = this.getTag('plugin/file', s);
const audio = this.getTag('plugin/audio', s);
const video = this.getTag('plugin/video', s);
const image = this.getTag('plugin/image', s);
if (file) {
mediaList.push(this.proxy.getFetch(s.url, s.origin, this.getFilename(s)));
} else if (audio && (audio.startsWith('cache:') || this.admin.getPlugin('plugin/audio')?.config?.proxy)) {
mediaList.push(this.proxy.getFetch(audio, s.origin, this.getFilename(s, $localize`Untitled Audio`)));
} else if (video && (video.startsWith('cache:') || this.admin.getPlugin('plugin/video')?.config?.proxy)) {
mediaList.push(this.proxy.getFetch(video, s.origin, this.getFilename(s, $localize`Untitled Video`)));
} else if (image && (image.startsWith('cache:') || this.admin.getPlugin('plugin/image')?.config?.proxy)) {
mediaList.push(this.proxy.getFetch(image, s.origin, this.getFilename(s, $localize`Untitled Image`)));
}
}
downloadPlaylist(this.proxy, mediaList, this.ref()!.title || 'playlist');
}
});
}
getTag(tag: string, ref: Ref) {
return this.admin.getPlugin(tag) &&
hasTag(tag, ref) &&
(ref?.plugins?.[tag]?.url || ref.url);
}
getFilename(ref: Ref, d = $localize`Untitled`) {
const ext = getExtension(ref.url) || '';
const filename = ref.title || d;
return filename + (ext && !filename.toLowerCase().endsWith(ext) ? ext : '');
}
ngOnChanges(changes: SimpleChanges) {
Iif (!changes.ref) return;
this.loading?.unsubscribe();
this.sources.set(undefined);
const ref = changes.ref.currentValue as Ref | undefined;
Iif (!ref?.sources?.length) return;
this.index.set(0);
this.loading = this.loadSources(ref.url, ref.sources.length)
.subscribe(page => this.sources.set(page));
}
ngOnDestroy() {
this.loading?.unsubscribe();
}
title(url?: string) {
return getTitle(this.sources()?.content.find(s => s.url === url) || (url ? { url } : undefined));
}
seek(index: number) {
this.index.set(index);
this.cd.detectChanges();
}
back() {
this.index.set((this.index() - 1 + this.ref()!.sources!.length) % this.ref()!.sources!.length);
this.cd.detectChanges();
}
next(loop = true) {
if (!loop && this.index() + 1 >= this.ref()!.sources!.length) return;
this.index.set((this.index() + 1) % this.ref()!.sources!.length);
this.cd.detectChanges();
}
private loadSources(
url: string,
fallbackTotalPages: number,
size = 20,
page = 0,
content: Ref[] = [],
totalPages?: number,
): Observable<Page<Ref>> {
Iif (page >= (totalPages ?? fallbackTotalPages)) return of(Page.of(content));
return this.refs.page({
sources: url,
page,
size,
sort: ['modified', 'origin'],
}).pipe(
switchMap(batch => {
const next = [...content, ...batch.content];
if (page + 1 >= batch.page.totalPages) return of(Page.of(next));
return this.loadSources(url, fallbackTotalPages, size, page + 1, next, batch.page.totalPages);
}),
catchError(err => {
Iif (err.status !== 413) return throwError(() => err);
return size > 1
? this.loadSources(url, fallbackTotalPages, Math.max(1, Math.floor(size / 2)))
: this.loadSources(url, fallbackTotalPages, size, page + 1, content, totalPages)
}),
);
}
}
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