77 lines
2.0 KiB
TypeScript
77 lines
2.0 KiB
TypeScript
"use client";
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import { createContext, useCallback, useContext, useEffect, useState } from "react";
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const storageKey = "agentcompany-theme";
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type ThemeMode = "light" | "dark";
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type ThemeContextValue = {
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theme: ThemeMode;
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setTheme: (theme: ThemeMode) => void;
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toggleTheme: () => void;
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};
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const ThemeContext = createContext<ThemeContextValue | undefined>(undefined);
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function resolveTheme(): ThemeMode {
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if (typeof window === "undefined") {
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return "light";
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}
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const stored = localStorage.getItem(storageKey);
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if (stored === "light" || stored === "dark") {
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return stored;
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}
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return window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
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}
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export function ThemeProvider({ children }: { children: React.ReactNode }) {
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const [theme, setThemeState] = useState<ThemeMode>(resolveTheme);
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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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} else {
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root.classList.remove("dark");
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}
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localStorage.setItem(storageKey, theme);
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}, [theme]);
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useEffect(() => {
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const mediaQuery = window.matchMedia("(prefers-color-scheme: dark)");
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const handleChange = (event: MediaQueryListEvent) => {
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if (!localStorage.getItem(storageKey)) {
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setThemeState(event.matches ? "dark" : "light");
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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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}, []);
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const setTheme = useCallback((nextTheme: ThemeMode) => {
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setThemeState(nextTheme);
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}, []);
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const toggleTheme = useCallback(() => {
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setThemeState((currentTheme) => (currentTheme === "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 context = useContext(ThemeContext);
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if (!context) {
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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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