"use client";

import type React from "react";

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

type Theme = "light" | "dark";

type ThemeContextType = {
  theme: Theme;
  toggleTheme: () => void;
};

const ThemeContext = createContext<ThemeContextType | undefined>(undefined);

export function ThemeProvider({ children }: { children: React.ReactNode }) {
  const [theme, setTheme] = useState<Theme>("dark");
  const [mounted, setMounted] = useState(false);

  useEffect(() => {
    setMounted(true);
    const savedTheme = localStorage.getItem("theme") as Theme | null;
    if (savedTheme) {
      setTheme(savedTheme);
    }
  }, []);

  useEffect(() => {
    if (mounted) {
      const root = document.documentElement;
      if (theme === "dark") {
        root.classList.add("dark");
      } else {
        root.classList.remove("dark");
      }
      localStorage.setItem("theme", theme);
    }
  }, [theme, mounted]);

  const toggleTheme = () => {
    setTheme((prev) => (prev === "dark" ? "light" : "dark"));
  };

  return (
    <ThemeContext.Provider value={{ theme, toggleTheme }}>
      {children}
    </ThemeContext.Provider>
  );
}

export function useTheme() {
  const context = useContext(ThemeContext);
  if (context === undefined) {
    throw new Error("useTheme must be used within a ThemeProvider");
  }
  return context;
}