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import { isPlatformBrowser } from '@angular/common';
import { Theme } from '../types';
const THEME_STORAGE_KEY = 'nimmit-theme';
/**
* Theme Service für Dark/Light Mode Management
*
* Verwendung:
*
* ```typescript
* // In einer Component
* export class MyComponent {
* private themeService = inject(ThemeService);
*
* // Aktuelles Theme lesen
* currentTheme = this.themeService.theme;
*
* // Ob Dark Mode aktiv ist
* isDark = this.themeService.isDarkMode;
*
* // Theme wechseln
* toggleTheme() {
* this.themeService.toggleTheme();
* }
*
* // Bestimmtes Theme setzen
* setDark() {
* this.themeService.setTheme('dark');
* }
* }
* ```
*/
@Injectable({
providedIn: 'root',
})
export class ThemeService {
private readonly platformId = inject(PLATFORM_ID);
private readonly isBrowser = isPlatformBrowser(this.platformId);
/** Aktuelles Theme ('light', 'dark', oder 'system') */
readonly theme = signal<Theme>(this.getInitialTheme());
/** Ob aktuell Dark Mode aktiv ist (auch bei 'system' Theme) */
readonly isDarkMode = signal(this.checkIsDarkMode());
private mediaQuery: MediaQueryList | null = null;
constructor() {
Eif (this.isBrowser) {
// Media Query für System-Präferenz
this.mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
// Listener für System-Präferenz-Änderungen
this.mediaQuery.addEventListener('change', (e) => {
if (this.theme() === 'system') {
this.applyTheme(e.matches ? 'dark' : 'light');
this.isDarkMode.set(e.matches);
}
});
// Effect um Theme-Änderungen zu verarbeiten
effect(() => {
const theme = this.theme();
this.saveTheme(theme);
this.updateTheme(theme);
});
// Initial Theme anwenden
this.updateTheme(this.theme());
}
}
/**
* Setzt das Theme
* @param theme 'light', 'dark', oder 'system'
*/
setTheme(theme: Theme): void {
this.theme.set(theme);
}
/**
* Wechselt zwischen Light und Dark Mode
* (System wird zu Light wenn aktuell dunkel, sonst zu Dark)
*/
toggleTheme(): void {
const current = this.theme();
if (current === 'system') {
// Bei System: Wechsel zu entgegengesetztem Modus
this.setTheme(this.isDarkMode() ? 'light' : 'dark');
} else {
this.setTheme(current === 'dark' ? 'light' : 'dark');
}
}
/**
* Zykliert durch alle Themes: light -> dark -> system -> light
*/
cycleTheme(): void {
const current = this.theme();
const themes: Theme[] = ['light', 'dark', 'system'];
const currentIndex = themes.indexOf(current);
const nextIndex = (currentIndex + 1) % themes.length;
this.setTheme(themes[nextIndex]);
}
private getInitialTheme(): Theme {
Iif (!this.isBrowser) {
return 'system';
}
const stored = localStorage.getItem(THEME_STORAGE_KEY);
Iif (stored && ['light', 'dark', 'system'].includes(stored)) {
return stored as Theme;
}
return 'system';
}
private saveTheme(theme: Theme): void {
Eif (this.isBrowser) {
localStorage.setItem(THEME_STORAGE_KEY, theme);
}
}
private updateTheme(theme: Theme): void {
Iif (!this.isBrowser) return;
let effectiveTheme: 'light' | 'dark';
if (theme === 'system') {
effectiveTheme = this.mediaQuery?.matches ? 'dark' : 'light';
// Entferne data-theme um System-Präferenz zu nutzen
document.documentElement.removeAttribute('data-theme');
} else {
effectiveTheme = theme;
document.documentElement.setAttribute('data-theme', theme);
}
this.isDarkMode.set(effectiveTheme === 'dark');
this.applyTheme(effectiveTheme);
}
private applyTheme(theme: 'light' | 'dark'): void {
Iif (!this.isBrowser) return;
// Für iOS/Safari: meta theme-color anpassen
const metaThemeColor = document.querySelector('meta[name="theme-color"]');
Iif (metaThemeColor) {
metaThemeColor.setAttribute(
'content',
theme === 'dark' ? '#121212' : '#ffffff'
);
}
}
private checkIsDarkMode(): boolean {
Iif (!this.isBrowser) return false;
const theme = this.getInitialTheme();
Eif (theme === 'system') {
return window.matchMedia('(prefers-color-scheme: dark)').matches;
}
return theme === 'dark';
}
}
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