51 lines
1.4 KiB
TypeScript
51 lines
1.4 KiB
TypeScript
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import { createContext, useContext, useState, useEffect, useCallback } from 'react'
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type Theme = 'dark' | 'light'
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interface ThemeContextValue {
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theme: Theme
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toggleTheme: () => void
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isDark: boolean
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}
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const ThemeContext = createContext<ThemeContextValue | null>(null)
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function getInitialTheme(): Theme {
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if (typeof window === 'undefined') return 'dark'
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const stored = localStorage.getItem('cc-theme')
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if (stored === 'light' || stored === 'dark') return stored
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return window.matchMedia('(prefers-color-scheme: light)').matches ? 'light' : 'dark'
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}
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export function ThemeProvider({ children }: { children: React.ReactNode }) {
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const [theme, setTheme] = useState<Theme>(getInitialTheme)
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useEffect(() => {
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const root = document.documentElement
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if (theme === 'dark') {
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root.classList.add('dark')
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root.classList.remove('light')
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} else {
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root.classList.add('light')
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root.classList.remove('dark')
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}
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localStorage.setItem('cc-theme', theme)
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}, [theme])
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const toggleTheme = useCallback(() => {
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setTheme((prev) => (prev === 'dark' ? 'light' : 'dark'))
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}, [])
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return (
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<ThemeContext.Provider value={{ theme, toggleTheme, isDark: theme === 'dark' }}>
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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 ctx = useContext(ThemeContext)
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if (!ctx) throw new Error('useTheme must be used within ThemeProvider')
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return ctx
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}
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