'use client';

import * as React from 'react';
import Link from 'next/link';
import Image from 'next/image';
import { usePathname } from 'next/navigation';
import { motion, AnimatePresence } from 'framer-motion';

export interface NavLink {
  label: string;
  url: string;
}

interface HeaderProps {
  navLinks: NavLink[];
}

export function Header({ navLinks }: HeaderProps) {
  const [isScrolled, setIsScrolled] = React.useState(false);
  const [isMobileMenuOpen, setIsMobileMenuOpen] = React.useState(false);
  const pathname = usePathname() || '/';

  // Determine current locale from pathname
  const currentLocale = pathname.startsWith('/en') ? 'en' : 'de';

  // Helper to switch languages
  const getSwitchedUrl = (newLocale: string) => {
    if (!pathname) return `/${newLocale}`;
    const pathWithoutLocale = pathname.replace(/^\/(en|de)/, '');
    return `/${newLocale}${pathWithoutLocale === '' ? '' : pathWithoutLocale}`;
  };

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

  // Close mobile menu on route change
  React.useEffect(() => {
    setIsMobileMenuOpen(false);
  }, [pathname]);

  const LanguageSwitcher = ({ mobile = false }) => (
    <div className={`flex items-center gap-2 ${mobile ? 'text-xl' : 'text-sm font-bold'} ${mobile ? 'text-neutral-dark' : isScrolled ? 'text-text-primary' : 'text-neutral-light'}`}>
      <Link href={getSwitchedUrl('de')} className={`transition-colors hover:text-primary ${currentLocale === 'de' ? 'text-primary' : ''}`}>DE</Link>
      <span className="opacity-50">|</span>
      <Link href={getSwitchedUrl('en')} className={`transition-colors hover:text-primary ${currentLocale === 'en' ? 'text-primary' : ''}`}>EN</Link>
    </div>
  );

  return (
    <>
      <header
        className={`fixed top-0 left-0 right-0 z-50 transition-all duration-300 ease-in-out ${
          isScrolled
            ? 'bg-neutral-light/90 backdrop-blur-md shadow-sm py-4'
            : 'bg-transparent py-6'
        }`}
      >
        <div className="container flex items-center justify-between">
          <Link href={`/${currentLocale}`} className="relative flex items-center h-12 w-48 z-50">
            <Image
              src={(isScrolled || isMobileMenuOpen) ? "/assets/logo.png" : "/assets/logo-white.png"}
              alt="E-TIB Gruppe"
              fill
              className="object-contain object-left"
              priority
              sizes="192px"
            />
          </Link>
          
          <nav className="hidden md:flex items-center gap-10">
            {navLinks && navLinks.length > 0 && navLinks.map((link) => {
              const mappedUrl = link.url.startsWith('/') && !link.url.match(/^\/(en|de)/) 
                ? `/${currentLocale}${link.url}` 
                : link.url;
                
              return (
                <Link 
                  key={link.url}
                  href={mappedUrl} 
                  className={`font-semibold text-sm uppercase tracking-widest transition-all duration-300 ${
                    isScrolled 
                      ? 'text-text-primary hover:text-primary' 
                      : 'text-neutral-light hover:text-primary-light'
                  }`}
                >
                  {link.label}
                </Link>
              );
            })}
            <div className="h-4 w-px bg-white/20 mx-2" />
            <LanguageSwitcher />
            <Link
              href={`/${currentLocale}/${currentLocale === 'de' ? 'kontakt' : 'contact'}`}
              className="rounded-xl bg-primary hover:bg-primary-dark text-neutral-light px-8 py-3 font-bold text-sm uppercase tracking-wider transition-all shadow-xl hover:shadow-primary/20 hover:-translate-y-0.5 active:translate-y-0"
            >
              {currentLocale === 'de' ? 'Kontakt' : 'Contact'}
            </Link>
          </nav>

          {/* Mobile Nav Button */}
          <button 
            className="md:hidden z-50 text-primary p-2"
            onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
            aria-label="Toggle menu"
          >
            <svg xmlns="http://www.w3.org/2000/svg" width="28" height="28" viewBox="0 0 24 24" fill="none" stroke={(isScrolled || isMobileMenuOpen) ? "currentColor" : "white"} strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round">
              {isMobileMenuOpen ? (
                <>
                  <line x1="18" y1="6" x2="6" y2="18"></line>
                  <line x1="6" y1="6" x2="18" y2="18"></line>
                </>
              ) : (
                <>
                  <line x1="3" x2="21" y1="6" y2="6"/>
                  <line x1="3" x2="21" y1="12" y2="12"/>
                  <line x1="3" x2="21" y1="18" y2="18"/>
                </>
              )}
            </svg>
          </button>
        </div>
      </header>

      {/* Mobile Menu Overlay */}
      <AnimatePresence>
        {isMobileMenuOpen && (
          <motion.div
            initial={{ opacity: 0, y: -20 }}
            animate={{ opacity: 1, y: 0 }}
            exit={{ opacity: 0, y: -20 }}
            transition={{ duration: 0.2 }}
            className="fixed inset-0 z-40 bg-white md:hidden pt-32 pb-8 px-6 overflow-y-auto"
          >
            <nav className="flex flex-col gap-6">
              {navLinks && navLinks.length > 0 && navLinks.map((link) => {
                const mappedUrl = link.url.startsWith('/') && !link.url.match(/^\/(en|de)/) 
                  ? `/${currentLocale}${link.url}` 
                  : link.url;
                  
                return (
                  <Link 
                    key={link.url}
                    href={mappedUrl} 
                    className="text-2xl font-heading font-bold text-neutral-dark border-b border-neutral-100 pb-4"
                  >
                    {link.label}
                  </Link>
                );
              })}
              
              <Link 
                href={`/${currentLocale}/${currentLocale === 'de' ? 'kontakt' : 'contact'}`} 
                className="text-2xl font-heading font-bold text-primary border-b border-neutral-100 pb-4"
              >
                {currentLocale === 'de' ? 'Kontakt' : 'Contact'}
              </Link>
              
              <div className="mt-8 pt-6">
                <p className="text-text-secondary text-sm font-bold uppercase tracking-widest mb-4">Sprache wählen</p>
                <LanguageSwitcher mobile={true} />
              </div>
            </nav>
          </motion.div>
        )}
      </AnimatePresence>
    </>
  );
}