"use client";

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

type Theme = "light" | "dark";

interface ThemeContextType {
  theme: Theme;
  toggleTheme: () => void;
  setTheme: (t: Theme) => void;
}

const ThemeContext = createContext<ThemeContextType>({
  theme: "light",
  toggleTheme: () => {},
  setTheme: () => {},
});

export function useTheme() {
  return useContext(ThemeContext);
}

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

  useEffect(() => {
    setMounted(true);
    const saved = localStorage.getItem("theme") as Theme | null;
    if (saved === "dark" || saved === "light") {
      setThemeState(saved);
      document.documentElement.classList.toggle("dark", saved === "dark");
    }
  }, []);

  const setTheme = (t: Theme) => {
    setThemeState(t);
    localStorage.setItem("theme", t);
    document.documentElement.classList.toggle("dark", t === "dark");
  };

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

  if (!mounted) {
    return <div className="bg-steel-100 text-steel-900 min-h-screen">{children}</div>;
  }

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