From 3bf77d7c3144b16d55f35998dddc0d67bb8c17b2 Mon Sep 17 00:00:00 2001
From: Gregor Kleen <gkleen@yggdrasil.li>
Date: Tue, 7 Jun 2022 21:38:00 +0200
Subject: ...

---
 overlays/spm/frontend/src/app/app.component.ts | 89 ++++++++++++++++++++++++--
 1 file changed, 84 insertions(+), 5 deletions(-)

(limited to 'overlays/spm/frontend/src/app/app.component.ts')

diff --git a/overlays/spm/frontend/src/app/app.component.ts b/overlays/spm/frontend/src/app/app.component.ts
index 7c231203..11c0f772 100644
--- a/overlays/spm/frontend/src/app/app.component.ts
+++ b/overlays/spm/frontend/src/app/app.component.ts
@@ -1,6 +1,18 @@
-import { Component, OnInit, OnDestroy } from '@angular/core';
+import { Component, OnInit, OnDestroy, Inject, Renderer2, RendererFactory2 } from '@angular/core';
+import { DOCUMENT } from '@angular/common';
+import { MediaMatcher } from '@angular/cdk/layout';
+import { LocalStorage } from 'ngx-webstorage';
+import { BehaviorSubject, Subscription, Subject } from 'rxjs';
+import { Router, RouterEvent, NavigationStart, NavigationEnd, NavigationCancel, NavigationError } from '@angular/router';
+import { HttpClient, HttpHeaders } from '@angular/common/http';
 
-import { ColorSchemeService } from './color-scheme.service';
+import { map, filter } from 'rxjs/operators';
+
+type ColorScheme = 'dark' | 'light';
+
+export interface DomainResponse {
+  domain: string;
+}
 
 @Component({
   selector: 'app-root',
@@ -8,14 +20,81 @@ import { ColorSchemeService } from './color-scheme.service';
   styleUrls: ['./app.component.sass']
 })
 export class AppComponent implements OnInit, OnDestroy {
+  private renderer: Renderer2;
+  colorSchemeMatcher: MediaQueryList;
+
   title = 'spm-frontend';
 
-  constructor(private colorSchemeService: ColorSchemeService) {}
+  public activeColorScheme$: BehaviorSubject<ColorScheme> = new BehaviorSubject<ColorScheme>('dark');
+
+  @LocalStorage('prefers-color-scheme')
+  public colorSchemeOverride?: ColorScheme;
+
+  colorSchemeSubscription?: Subscription;
+
+  router: Router;
+  public routerLoading$: Subject<boolean> = new Subject<boolean>();
+  routerEventSubscription?: Subscription;
+
+  http: HttpClient;
+  apiDomain$: Subject<string> = new Subject<string>();
+
+  constructor( rendererFactory: RendererFactory2,
+               mediaMatcher: MediaMatcher,
+               @Inject(DOCUMENT) private document: Document,
+               router: Router,
+               http: HttpClient,
+             ) {
+    this.renderer = rendererFactory.createRenderer(null, null);
+    this.colorSchemeMatcher = mediaMatcher.matchMedia('(prefers-color-scheme: dark)');
+    this.document = document;
+
+    this.colorSchemeListener = this.colorSchemeListener.bind(this);
+    this.colorSchemeMatcher.addEventListener('change', this.colorSchemeListener);
+    this.activeColorScheme$.next(this.getColorScheme());
+
+    this.router = router;
+    this.http = http;
+  }
+
+  private colorSchemeListener(event: { matches: boolean; }) {
+    this.activeColorScheme$.next(this.getColorScheme(event));
+  }
+
+  private getColorScheme(event?: { matches: boolean; }): ColorScheme {
+    if (this.colorSchemeOverride) {
+      return this.colorSchemeOverride;
+    } else if (event) {
+      return event.matches ? 'dark' : 'light';
+    } else {
+      return this.colorSchemeMatcher.matches ? 'dark' : 'light';
+    }
+  }
+
+  updateColorScheme(scheme: ColorScheme) {
+    this.colorSchemeOverride = scheme;
+    this.activeColorScheme$.next(scheme);
+  }
 
   ngOnInit() {
-    this.colorSchemeService.init();
+    this.colorSchemeSubscription = this.activeColorScheme$.subscribe(scheme => { this.renderer.setAttribute(this.document.body, 'data-color-scheme', scheme); });
+
+    this.routerEventSubscription = this.router.events.pipe(
+      filter(event =>
+        event instanceof NavigationStart ||
+        event instanceof NavigationEnd ||
+        event instanceof NavigationCancel ||
+        event instanceof NavigationError
+            ),
+      map(event => event instanceof NavigationStart)
+    ).subscribe(this.routerLoading$);
+
+    this.http.get<DomainResponse>('/domain', { headers: new HttpHeaders({ 'Accept': 'application/json' }) }).pipe(map((resp: DomainResponse) => resp.domain)).subscribe(this.apiDomain$);
   }
   ngOnDestroy() {
-    this.colorSchemeService.destroy();
+    this.colorSchemeMatcher.removeEventListener('change', this.colorSchemeListener);
+
+    this.colorSchemeSubscription?.unsubscribe();
+    this.routerEventSubscription?.unsubscribe();
   }
 }
-- 
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