43 lines
1.1 KiB
TypeScript
43 lines
1.1 KiB
TypeScript
"use client";
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import { createContext, useContext, useEffect, useState, type ReactNode } from "react";
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type Theme = "light" | "dark";
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interface ThemeCtx {
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theme: Theme;
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toggle: () => void;
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setTheme: (t: Theme) => void;
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}
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const Ctx = createContext<ThemeCtx | null>(null);
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const KEY = "ip-theme";
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export function ThemeProvider({ children }: { children: ReactNode }) {
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const [theme, setTheme] = useState<Theme>("light");
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useEffect(() => {
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const saved = localStorage.getItem(KEY) as Theme | null;
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const initial = saved === "dark" || saved === "light" ? saved : "light";
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setTheme(initial);
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document.documentElement.classList.toggle("dark", initial === "dark");
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}, []);
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useEffect(() => {
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document.documentElement.classList.toggle("dark", theme === "dark");
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localStorage.setItem(KEY, theme);
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}, [theme]);
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return (
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<Ctx.Provider value={{ theme, toggle: () => setTheme((p) => (p === "light" ? "dark" : "light")), setTheme }}>
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{children}
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</Ctx.Provider>
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);
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}
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export function useTheme() {
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const c = useContext(Ctx);
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if (!c) throw new Error("useTheme must be within ThemeProvider");
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return c;
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}
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