75 lines
1.6 KiB
TypeScript
75 lines
1.6 KiB
TypeScript
"use client";
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import {
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createContext,
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useCallback,
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useContext,
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useEffect,
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useState,
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type ReactNode,
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} from "react";
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const STORAGE_KEY = "theme";
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export type Theme = "light" | "dark";
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type ThemeContextValue = {
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theme: Theme;
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setTheme: (theme: Theme) => void;
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toggleTheme: () => void;
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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 "light";
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try {
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const stored = localStorage.getItem(STORAGE_KEY) as Theme | null;
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if (stored === "dark" || stored === "light") return stored;
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return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
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} catch {
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return "light";
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}
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}
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function applyTheme(theme: Theme) {
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const root = document.documentElement;
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root.classList.toggle("dark", theme === "dark");
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}
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export function ThemeProvider({ children }: { children: ReactNode }) {
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const [theme, setThemeState] = useState<Theme>(getInitialTheme);
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useEffect(() => {
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applyTheme(theme);
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try {
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localStorage.setItem(STORAGE_KEY, theme);
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} catch {
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/* ignore */
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}
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}, [theme]);
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const setTheme = useCallback((newTheme: Theme) => {
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setThemeState(newTheme);
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}, []);
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const toggleTheme = useCallback(() => {
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setThemeState((prev) => (prev === "light" ? "dark" : "light"));
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}, []);
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return (
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<ThemeContext.Provider value={{ theme, setTheme, toggleTheme }}>
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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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