import { useState } from 'react';
import { motion } from 'framer-motion';
import { Menu, X, Sun, Moon, Globe, LogIn, LogOut } from 'lucide-react';
import { useLanguage } from '../contexts/LanguageContext';
import { useNavigate, useLocation, Link } from 'react-router-dom';
import { useAuth } from '../contexts/AuthContext';

interface HeaderProps {
  darkMode: boolean;
  toggleDarkMode: () => void;
}

const Header = ({ darkMode, toggleDarkMode }: HeaderProps) => {
  const [isMenuOpen, setIsMenuOpen] = useState(false);
  const { language, setLanguage, t } = useLanguage();
  const { user, loading, logout } = useAuth();
  const navigate = useNavigate();
  const location = useLocation();

  type MenuItem = {
    id: string;
    name: string;
    href: string;
    kind: 'section' | 'route';
  };

  const menuItems: MenuItem[] = [
    { id: 'home', name: t('nav.home'), href: '#hero', kind: 'section' },
    { id: 'about', name: t('nav.about'), href: '#about', kind: 'section' },
    { id: 'skills', name: t('nav.skills'), href: '#skills', kind: 'section' },
    { id: 'projects', name: t('nav.projects'), href: '#projects', kind: 'section' },
    { id: 'education', name: t('nav.education'), href: '#education', kind: 'section' },
    { id: 'contact', name: t('nav.contact'), href: '#contact', kind: 'section' }
  ];

  const handleNavigation = (item: MenuItem) => {
    setIsMenuOpen(false);
    if (item.kind === 'route') {
      navigate(item.href);
      return;
    }

    if (location.pathname === `/${language}` || location.pathname === `/${language}/`) {
      // Already on home, just scroll
      const element = document.querySelector(item.href);
      if (element) {
        element.scrollIntoView({ behavior: 'smooth' });
      }
    } else {
      // Not on home, navigate then scroll (using a simple timeout for simplicity or hash)
      navigate(`/${language}`);
      // Small timeout to allow navigation to render Home before scrolling
      setTimeout(() => {
        const element = document.querySelector(item.href);
        if (element) {
          element.scrollIntoView({ behavior: 'smooth' });
        }
      }, 100);
    }
  };

  const toggleLanguage = () => {
    setLanguage(language === 'fr' ? 'en' : 'fr');
  };

  const handleLogout = async () => {
    try {
      await logout();
    } catch {}
  };

  const avatarLabel = user?.displayName?.trim()?.charAt(0)?.toUpperCase() || user?.email?.trim()?.charAt(0)?.toUpperCase() || 'U';

  return (
    <motion.header
      initial={{ y: -100 }}
      animate={{ y: 0 }}
      transition={{ duration: 0.5 }}
      className="header"
    >
      <nav className="nav">
        <motion.div
          className="nav-brand"
          whileHover={{ scale: 1.05 }}
          whileTap={{ scale: 0.95 }}
        >
          <Link to={`/${language}`} onClick={(e) => {
            e.preventDefault();
            handleNavigation({ id: 'brand', name: 'home', href: '#hero', kind: 'section' });
          }}>
            Dayron Van Leemput
          </Link>
        </motion.div>

        <div className="nav-spacer" />

        <div className="nav-controls">
          {/* Toggle langue */}
          <motion.button
            whileHover={{ scale: 1.1 }}
            whileTap={{ scale: 0.9 }}
            onClick={toggleLanguage}
            className="language-toggle"
            aria-label={t('btn.changeLang')}
            title={t('btn.changeLang')}
          >
            <Globe size={18} />
            <span className="language-text">{language === 'fr' ? 'EN' : 'FR'}</span>
          </motion.button>

          {/* Toggle thème */}
          <motion.button
            whileHover={{ scale: 1.1 }}
            whileTap={{ scale: 0.9 }}
            onClick={toggleDarkMode}
            className="theme-toggle"
            aria-label={t('btn.changeTheme')}
          >
            {darkMode ? <Sun size={20} /> : <Moon size={20} />}
          </motion.button>

          {!loading && user ? (
            <>
              <div className="auth-avatar" title={user.email ?? ''} aria-label={user.email ?? 'User avatar'}>
                {user.photoURL ? <img src={user.photoURL} alt={user.displayName || 'Avatar utilisateur'} /> : <span>{avatarLabel}</span>}
              </div>
              <motion.button
                whileHover={{ scale: 1.05 }}
                whileTap={{ scale: 0.95 }}
                onClick={handleLogout}
                className="auth-toggle auth-toggle--logout"
                aria-label={language === 'fr' ? 'Se déconnecter' : 'Sign out'}
                title={language === 'fr' ? 'Se déconnecter' : 'Sign out'}
              >
                <LogOut size={16} />
                <span className="logout-text">{language === 'fr' ? 'Se déconnecter' : 'Sign out'}</span>
              </motion.button>
            </>
          ) : (
            <motion.button
              whileHover={{ scale: 1.05 }}
              whileTap={{ scale: 0.95 }}
              onClick={() => navigate(`/${language}/login`)}
              className="auth-toggle auth-toggle--login"
              aria-label={language === 'fr' ? 'Aller à la page de connexion' : 'Go to login page'}
              title={language === 'fr' ? 'Aller à la page de connexion' : 'Go to login page'}
            >
              <LogIn size={16} />
              <span className="auth-toggle-text">{language === 'fr' ? 'Connexion' : 'Sign in'}</span>
            </motion.button>
          )}

          {/* Menu hamburger mobile */}
          <motion.button
            whileHover={{ scale: 1.1 }}
            whileTap={{ scale: 0.9 }}
            onClick={() => setIsMenuOpen(!isMenuOpen)}
            className="menu-toggle"
            aria-label={t('btn.menu')}
          >
            {isMenuOpen ? <X size={24} /> : <Menu size={24} />}
          </motion.button>
        </div>

        <div className={`nav-drawer ${isMenuOpen ? 'open' : ''}`}>
          <ul className="nav-drawer-list">
            {menuItems.map((item) => (
              <li key={item.id}>
                <a
                  href={item.href}
                  onClick={(e) => {
                    e.preventDefault();
                    handleNavigation(item);
                  }}
                  className={item.kind === 'route' && location.pathname === item.href ? 'is-active' : ''}
                >
                  {item.name}
                </a>
              </li>
            ))}
          </ul>
        </div>
      </nav>
    </motion.header>
  );
};

export default Header;