"use client";

import { createContext, useContext, useState, useEffect, ReactNode } from "react";

type Theme = "light" | "dark";
interface ThemeCtx {
  theme: Theme;
  toggle: () => void;
}
const Ctx = createContext<ThemeCtx>({ theme: "light", toggle: () => {} });

export function ThemeProvider({ children }: { children: ReactNode }) {
  const [theme, setTheme] = useState<Theme>("light");
  useEffect(() => {
    const root = document.documentElement;
    if (theme === "dark") root.classList.add("dark");
    else root.classList.remove("dark");
  }, [theme]);
  return (
    <Ctx.Provider
      value={{ theme, toggle: () => setTheme((t) => (t === "light" ? "dark" : "light")) }}
    >
      {children}
    </Ctx.Provider>
  );
}

export const useTheme = () => useContext(Ctx);