import { createContext, useContext, useState, useEffect, ReactNode } from 'react';
import { Language } from '@/lib/translations';

interface LanguageContextType {
  language: Language;
  setLanguage: (lang: Language) => void;
}

const LanguageContext = createContext<LanguageContextType | undefined>(undefined);

export function LanguageProvider({ children }: { children: ReactNode }) {
  const [language, setLanguageState] = useState<Language>(() => {
    // Try to get from localStorage
    const saved = localStorage.getItem('language');
    if (saved === 'pt' || saved === 'en' || saved === 'es') {
      return saved;
    }
    // Default to English
    return 'en';
  });

  const setLanguage = (lang: Language) => {
    setLanguageState(lang);
    localStorage.setItem('language', lang);
  };

  useEffect(() => {
    // Set HTML lang attribute for accessibility
    document.documentElement.lang = language;
  }, [language]);

  return (
    <LanguageContext.Provider value={{ language, setLanguage }}>
      {children}
    </LanguageContext.Provider>
  );
}

export function useLanguage() {
  const context = useContext(LanguageContext);
  if (context === undefined) {
    throw new Error('useLanguage must be used within a LanguageProvider');
  }
  return context;
}