import { useState, useEffect } from 'react';
import { Link, useLocation, useNavigate } from 'react-router-dom';
import { motion, AnimatePresence } from 'framer-motion';
import { HiMenu, HiX, HiChevronDown, HiHeart, HiUserCircle } from 'react-icons/hi';
import { useAuth } from '../../contexts/AuthContext';
import { NAV_LINKS, FOUNDATION_INFO } from '../../utils/constants';
import './Header.css';

export default function Header() {
  const [isScrolled, setIsScrolled] = useState(false);
  const [mobileOpen, setMobileOpen] = useState(false);
  const [dropdownOpen, setDropdownOpen] = useState(null);
  const { currentUser, userProfile, logout } = useAuth();
  const location = useLocation();
  const navigate = useNavigate();

  useEffect(() => {
    const handleScroll = () => setIsScrolled(window.scrollY > 20);
    window.addEventListener('scroll', handleScroll);
    return () => window.removeEventListener('scroll', handleScroll);
  }, []);

  // Close mobile menu on route change
  useEffect(() => {
    setMobileOpen(false);
    setDropdownOpen(null);
  }, [location]);

  const handleLogout = async () => {
    try {
      await logout();
      navigate('/');
    } catch (error) {
      console.error('Logout error:', error);
    }
  };

  const isActive = (path) => location.pathname === path;

  return (
    <header className={`header ${isScrolled ? 'header--scrolled' : ''}`}>
      <div className="header__container container">
        {/* Logo */}
        <Link to="/" className="header__logo">
          <img src="/logo.png" alt={FOUNDATION_INFO.name} className="header__logo-img" />
          <div className="header__logo-text">
            <span className="header__logo-name">Social Share</span>
            <span className="header__logo-sub">& Care Foundation</span>
          </div>
        </Link>

        {/* Desktop Navigation */}
        <nav className="header__nav">
          {NAV_LINKS.map((link) => (
            <div
              key={link.path}
              className="header__nav-item"
              onMouseEnter={() => link.children && setDropdownOpen(link.path)}
              onMouseLeave={() => setDropdownOpen(null)}
            >
              <Link
                to={link.path}
                className={`header__nav-link ${isActive(link.path) ? 'header__nav-link--active' : ''}`}
              >
                {link.label}
                {link.children && <HiChevronDown className="header__chevron" />}
              </Link>

              {/* Dropdown */}
              <AnimatePresence>
                {link.children && dropdownOpen === link.path && (
                  <motion.div
                    className="header__dropdown"
                    initial={{ opacity: 0, y: 10 }}
                    animate={{ opacity: 1, y: 0 }}
                    exit={{ opacity: 0, y: 10 }}
                    transition={{ duration: 0.2 }}
                  >
                    {link.children.map((child) => (
                      <Link
                        key={child.path}
                        to={child.path}
                        className="header__dropdown-link"
                      >
                        {child.label}
                      </Link>
                    ))}
                  </motion.div>
                )}
              </AnimatePresence>
            </div>
          ))}
        </nav>

        {/* Right Actions */}
        <div className="header__actions">
          <Link to="/donate" className="btn btn--primary btn--sm header__donate-btn">
            <HiHeart /> Donate
          </Link>

          {currentUser ? (
            <div
              className="header__user"
              onMouseEnter={() => setDropdownOpen('user')}
              onMouseLeave={() => setDropdownOpen(null)}
            >
              <button className="header__user-btn">
                {userProfile?.profileImage ? (
                  <img src={userProfile.profileImage} alt="" className="header__avatar" referrerPolicy="no-referrer" />
                ) : (
                  <HiUserCircle size={40} />
                )}
              </button>

              <AnimatePresence>
                {dropdownOpen === 'user' && (
                  <motion.div
                    className="header__dropdown header__dropdown--right"
                    initial={{ opacity: 0, y: 10 }}
                    animate={{ opacity: 1, y: 0 }}
                    exit={{ opacity: 0, y: 10 }}
                  >
                    <div className="header__dropdown-user">
                      <strong>{userProfile?.displayName}</strong>
                      <span>{userProfile?.email}</span>
                    </div>
                    <Link to="/dashboard" className="header__dropdown-link">Dashboard</Link>
                    <Link to="/dashboard/profile" className="header__dropdown-link">Profile</Link>
                    <Link to="/donations/history" className="header__dropdown-link">My Donations</Link>
                    <button onClick={handleLogout} className="header__dropdown-link header__dropdown-link--danger">
                      Sign Out
                    </button>
                  </motion.div>
                )}
              </AnimatePresence>
            </div>
          ) : (
            <Link to="/login" className="btn btn--outline btn--sm">
              Sign In
            </Link>
          )}

          {/* Mobile Toggle */}
          <button
            className="header__mobile-toggle"
            onClick={() => setMobileOpen(!mobileOpen)}
            aria-label="Toggle menu"
          >
            {mobileOpen ? <HiX size={24} /> : <HiMenu size={24} />}
          </button>
        </div>
      </div>

      {/* Mobile Menu */}
      <AnimatePresence>
        {mobileOpen && (
          <motion.div
            className="header__mobile"
            initial={{ height: 0, opacity: 0 }}
            animate={{ height: 'auto', opacity: 1 }}
            exit={{ height: 0, opacity: 0 }}
            transition={{ duration: 0.3 }}
          >
            <nav className="header__mobile-nav">
              {NAV_LINKS.map((link) => (
                <div key={link.path}>
                  <Link
                    to={link.path}
                    className={`header__mobile-link ${isActive(link.path) ? 'header__mobile-link--active' : ''}`}
                  >
                    {link.label}
                  </Link>
                  {link.children && (
                    <div className="header__mobile-sub">
                      {link.children.map((child) => (
                        <Link key={child.path} to={child.path} className="header__mobile-sub-link">
                          {child.label}
                        </Link>
                      ))}
                    </div>
                  )}
                </div>
              ))}
              {!currentUser && (
                <Link to="/login" className="btn btn--primary" style={{ marginTop: '1rem' }}>
                  Sign In
                </Link>
              )}
              {currentUser && (
                <>
                  <Link to="/dashboard" className="header__mobile-link">Dashboard</Link>
                  <Link to="/donations/history" className="header__mobile-link">My Donations</Link>
                  <button onClick={handleLogout} className="header__mobile-link" style={{ color: '#EF4444' }}>
                    Sign Out
                  </button>
                </>
              )}
            </nav>
          </motion.div>
        )}
      </AnimatePresence>
    </header>
  );
}