import * as React from 'react';

type Theme = 'light' | 'dark';

interface ThemeContextType {
  theme: Theme;
  toggleTheme: () => void;
  isHeroVideoActive: boolean;
  setIsHeroVideoActive: (v: boolean) => void;
}

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

export const ThemeProvider: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  const [theme, setTheme] = React.useState<Theme>(() => {
    if (typeof window === 'undefined') return 'dark';
    const savedTheme = localStorage.getItem('theme') as Theme;
    if (savedTheme) return savedTheme;
    if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
      return 'dark';
    }
    return 'light';
  });
  const [isHeroVideoActive, setIsHeroVideoActive] = React.useState(true);

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

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

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

export const useTheme = () => {
  const context = React.useContext(ThemeContext);
  if (!context) {
    throw new Error('useTheme must be used within a ThemeProvider');
  }
  return context;
};