'use client';

import Link from 'next/link';
import Image from 'next/image';
import { useState, useEffect, useRef, useCallback } from 'react';
import { usePathname } from 'next/navigation';
import { useLanguage } from '@/context/LanguageContext';
import { useAuth } from '@/context/AuthContext';
import LanguageToggle from '@/components/LanguageToggle';
import Button from '@/components/ui/Button';
import { Bars3Icon, XMarkIcon } from '@heroicons/react/24/outline';

function NavLink({ href, children }: { href: string; children: React.ReactNode }) {
  const pathname = usePathname();
  const isActive = pathname === href || (href !== '/' && pathname.startsWith(href));
  
  return (
    <Link
      href={href}
      className="font-medium transition-colors"
      style={{ color: isActive ? '#FBB82B' : '#002F44' }}
    >
      {children}
    </Link>
  );
}

function MobileNavLink({ href, children, onClick }: { href: string; children: React.ReactNode; onClick: () => void }) {
  const pathname = usePathname();
  const isActive = pathname === href || (href !== '/' && pathname.startsWith(href));
  
  return (
    <Link
      href={href}
      className="block px-6 py-3 text-lg font-medium transition-colors hover:bg-gray-50"
      style={{ color: isActive ? '#FBB82B' : '#002F44' }}
      onClick={onClick}
    >
      {children}
    </Link>
  );
}

export default function Header() {
  const { t } = useLanguage();
  const { user, hasAdminAccess, logout } = useAuth();
  const [mobileMenuOpen, setMobileMenuOpen] = useState(false);
  const menuRef = useRef<HTMLDivElement>(null);
  const touchStartX = useRef<number>(0);
  const touchCurrentX = useRef<number>(0);
  const isDragging = useRef<boolean>(false);

  // Close menu on route change
  const pathname = usePathname();
  useEffect(() => {
    setMobileMenuOpen(false);
  }, [pathname]);

  // Prevent body scroll when menu is open
  useEffect(() => {
    if (mobileMenuOpen) {
      document.body.style.overflow = 'hidden';
    } else {
      document.body.style.overflow = '';
    }
    return () => {
      document.body.style.overflow = '';
    };
  }, [mobileMenuOpen]);

  // Handle swipe to close
  const handleTouchStart = useCallback((e: React.TouchEvent) => {
    touchStartX.current = e.touches[0].clientX;
    touchCurrentX.current = e.touches[0].clientX;
    isDragging.current = true;
  }, []);

  const handleTouchMove = useCallback((e: React.TouchEvent) => {
    if (!isDragging.current) return;
    touchCurrentX.current = e.touches[0].clientX;
    
    const deltaX = touchCurrentX.current - touchStartX.current;
    // Only allow dragging to the right (to close)
    if (deltaX > 0 && menuRef.current) {
      menuRef.current.style.transform = `translateX(${deltaX}px)`;
    }
  }, []);

  const handleTouchEnd = useCallback(() => {
    if (!isDragging.current) return;
    isDragging.current = false;
    
    const deltaX = touchCurrentX.current - touchStartX.current;
    const threshold = 100; // Minimum swipe distance to close
    
    if (menuRef.current) {
      menuRef.current.style.transform = '';
      if (deltaX > threshold) {
        setMobileMenuOpen(false);
      }
    }
  }, []);

  const closeMenu = useCallback(() => {
    setMobileMenuOpen(false);
  }, []);

  const navLinks = [
    { href: '/', label: t('nav.home') },
    { href: '/events', label: t('nav.events') },
    { href: '/community', label: t('nav.community') },
    { href: '/contact', label: t('nav.contact') },
  ];

  return (
    <header className="sticky top-0 z-50 bg-white shadow-sm">
      <nav className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="flex items-center justify-between h-16">
          {/* Logo */}
          <Link href="/" className="flex items-center">
            <Image
              src="/images/logo-spanglish.png"
              alt="Spanglish"
              width={140}
              height={40}
              className="h-10 w-auto"
              style={{ width: 'auto' }}
              priority
            />
          </Link>

          {/* Desktop Navigation */}
          <div className="hidden md:flex items-center gap-6">
            {navLinks.map((link) => (
              <NavLink key={link.href} href={link.href}>
                {link.label}
              </NavLink>
            ))}
          </div>

          {/* Right side actions */}
          <div className="hidden md:flex items-center gap-4">
            <LanguageToggle />
            
            {user ? (
              <div className="flex items-center gap-3">
                <Link href="/dashboard">
                  <Button variant="ghost" size="sm">
                    {t('nav.dashboard')}
                  </Button>
                </Link>
                {hasAdminAccess && (
                  <Link href="/admin">
                    <Button variant="ghost" size="sm">
                      {t('nav.admin')}
                    </Button>
                  </Link>
                )}
                <span className="text-sm text-gray-600">{user.name}</span>
                <Button variant="outline" size="sm" onClick={logout}>
                  {t('nav.logout')}
                </Button>
              </div>
            ) : (
              <div className="flex items-center gap-2">
                <Link href="/login">
                  <Button variant="ghost" size="sm">
                    {t('nav.login')}
                  </Button>
                </Link>
                <Link href="/events">
                  <Button size="sm">
                    {t('nav.joinEvent')}
                  </Button>
                </Link>
              </div>
            )}
          </div>

          {/* Mobile menu button (hamburger) */}
          <button
            className="md:hidden p-2 rounded-lg hover:bg-gray-100 transition-colors"
            onClick={() => setMobileMenuOpen(true)}
            aria-label="Open menu"
          >
            <Bars3Icon className="w-6 h-6" style={{ color: '#002F44' }} />
          </button>
        </div>
      </nav>

      {/* Mobile Slide-in Menu */}
      {/* Overlay */}
      <div
        className={`
          fixed inset-0 bg-black/50 z-40 md:hidden
          transition-opacity duration-300 ease-in-out
          ${mobileMenuOpen ? 'opacity-100 pointer-events-auto' : 'opacity-0 pointer-events-none'}
        `}
        onClick={closeMenu}
        aria-hidden="true"
      />

      {/* Slide-in Panel */}
      <div
        ref={menuRef}
        className={`
          fixed top-0 right-0 h-full w-[280px] max-w-[85vw] bg-white z-50 md:hidden
          shadow-xl transform transition-transform duration-300 ease-in-out
          ${mobileMenuOpen ? 'translate-x-0' : 'translate-x-full'}
        `}
        onTouchStart={handleTouchStart}
        onTouchMove={handleTouchMove}
        onTouchEnd={handleTouchEnd}
      >
        {/* Menu Header */}
        <div className="flex items-center justify-between p-4 border-b border-gray-100">
          <Image
            src="/images/logo-spanglish.png"
            alt="Spanglish"
            width={100}
            height={28}
            className="h-7 w-auto"
            style={{ width: 'auto' }}
          />
          <button
            className="p-2 rounded-lg hover:bg-gray-100 transition-colors"
            onClick={closeMenu}
            aria-label="Close menu"
          >
            <XMarkIcon className="w-6 h-6" style={{ color: '#002F44' }} />
          </button>
        </div>

        {/* Menu Content */}
        <div className="flex flex-col h-[calc(100%-65px)] overflow-y-auto">
          {/* Navigation Links */}
          <nav className="py-4">
            {navLinks.map((link) => (
              <MobileNavLink
                key={link.href}
                href={link.href}
                onClick={closeMenu}
              >
                {link.label}
              </MobileNavLink>
            ))}
          </nav>

          {/* Divider */}
          <div className="border-t border-gray-100 mx-6" />

          {/* Language Toggle */}
          <div className="px-6 py-4">
            <LanguageToggle variant="buttons" />
          </div>

          {/* Divider */}
          <div className="border-t border-gray-100 mx-6" />

          {/* Auth Actions */}
          <div className="px-6 py-4 flex flex-col gap-3 mt-auto">
            {user ? (
              <>
                <div className="text-sm text-gray-500 mb-2 flex items-center gap-2">
                  <div className="w-8 h-8 rounded-full bg-[#002F44] flex items-center justify-center text-white text-sm font-medium">
                    {user.name?.charAt(0).toUpperCase()}
                  </div>
                  <span className="font-medium text-[#002F44]">{user.name}</span>
                </div>
                <Link href="/dashboard" onClick={closeMenu}>
                  <Button variant="outline" className="w-full justify-center">
                    {t('nav.dashboard')}
                  </Button>
                </Link>
                {hasAdminAccess && (
                  <Link href="/admin" onClick={closeMenu}>
                    <Button variant="outline" className="w-full justify-center">
                      {t('nav.admin')}
                    </Button>
                  </Link>
                )}
                <Button 
                  variant="secondary" 
                  onClick={() => {
                    logout();
                    closeMenu();
                  }} 
                  className="w-full justify-center"
                >
                  {t('nav.logout')}
                </Button>
              </>
            ) : (
              <>
                <Link href="/login" onClick={closeMenu}>
                  <Button variant="outline" className="w-full justify-center">
                    {t('nav.login')}
                  </Button>
                </Link>
                <Link href="/events" onClick={closeMenu}>
                  <Button className="w-full justify-center">
                    {t('nav.joinEvent')}
                  </Button>
                </Link>
              </>
            )}
          </div>

          {/* Swipe hint */}
          <div className="px-6 pb-6 pt-2">
            <p className="text-xs text-gray-400 text-center">
              Swipe right to close
            </p>
          </div>
        </div>
      </div>
    </header>
  );
}
