"use client";

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

type Theme = "dark" | "dark-cyan";

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

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

interface ThemeProviderProps {
  children: ReactNode;
  initialTheme?: Theme;
}

export function ThemeProvider({
  children,
  initialTheme = "dark-cyan",
}: ThemeProviderProps) {
  const [theme, setThemeState] = useState<Theme>(() => {
    // Initialize theme from localStorage if available, otherwise use initialTheme
    if (typeof window !== "undefined") {
      const savedTheme = localStorage.getItem("theme") as Theme | null;
      if (savedTheme && (savedTheme === "dark" || savedTheme === "dark-cyan")) {
        return savedTheme;
      }
    }
    return initialTheme;
  });

  useEffect(() => {
    // Apply theme class to document element
    document.documentElement.className = theme;
  }, [theme]);

  const setTheme = (newTheme: Theme) => {
    setThemeState(newTheme);
    document.documentElement.className = newTheme;
    localStorage.setItem("theme", newTheme);
  };

  const toggleTheme = () => {
    const newTheme = theme === "dark" ? "dark-cyan" : "dark";
    setTheme(newTheme);
  };

  return (
    <ThemeContext.Provider value={{ theme, setTheme, 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;
}