95 lines
2.8 KiB
TypeScript
95 lines
2.8 KiB
TypeScript
'use client';
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import { createContext, useContext, useEffect, useState, ReactNode, useLayoutEffect } from 'react';
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const THEMES = ['system', 'light', 'dark', 'ocean', 'forest', 'sunset', 'sea', 'mint'] as const;
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type Theme = (typeof THEMES)[number];
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interface ThemeContextType {
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theme: Theme;
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setTheme: (theme: Theme) => void;
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}
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const ThemeContext = createContext<ThemeContextType | undefined>(undefined);
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const getSystemTheme = () => {
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if (typeof window === 'undefined') return 'light';
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return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light';
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};
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const getEffectiveTheme = (theme: Theme): Theme => {
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if (theme === 'system') {
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return getSystemTheme();
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}
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return theme;
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};
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export function ThemeProvider({ children }: { children: ReactNode }) {
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const [theme, setTheme] = useState<Theme>('system');
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const [mounted, setMounted] = useState(false);
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// Initialize theme as early as possible to prevent flash
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useLayoutEffect(() => {
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const stored = localStorage.getItem('theme') as Theme;
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const initialTheme = stored && THEMES.includes(stored) ? stored : 'system';
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setTheme(initialTheme);
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const effectiveTheme = getEffectiveTheme(initialTheme);
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document.documentElement.classList.remove(...THEMES);
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document.documentElement.classList.add(effectiveTheme);
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document.documentElement.style.colorScheme = effectiveTheme;
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if (!stored) {
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localStorage.setItem('theme', initialTheme);
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}
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setMounted(true);
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}, []);
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const handleThemeChange = (newTheme: Theme) => {
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const root = window.document.documentElement;
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const effectiveTheme = getEffectiveTheme(newTheme);
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root.classList.remove(...THEMES);
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root.classList.add(effectiveTheme);
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root.style.colorScheme = effectiveTheme;
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localStorage.setItem('theme', newTheme);
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setTheme(newTheme);
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};
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useEffect(() => {
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const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
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const handleChange = () => {
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if (theme === 'system') {
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const effectiveTheme = getSystemTheme();
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const root = window.document.documentElement;
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root.classList.remove(...THEMES);
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root.classList.add(effectiveTheme);
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root.style.colorScheme = effectiveTheme;
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}
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};
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mediaQuery.addEventListener('change', handleChange);
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return () => mediaQuery.removeEventListener('change', handleChange);
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}, [theme]);
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// Prevent flash during SSR
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if (!mounted) {
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return null;
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}
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return (
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<ThemeContext.Provider value={{ theme, setTheme: handleThemeChange }}>
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{children}
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</ThemeContext.Provider>
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);
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}
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export function useTheme() {
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const context = useContext(ThemeContext);
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if (context === undefined) {
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throw new Error('useTheme must be used within a ThemeProvider');
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}
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return context;
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}
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export { THEMES };
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