"use client";

import { useState, useEffect } from "react";
import Link from "next/link";
import { useRouter, usePathname } from "next/navigation";
import { Menu, X } from "lucide-react";
import { useLanguage } from "@/contexts/LanguageContext";
import LanguageSelector from "./LanguageSelector";

export default function Header() {
  const { t } = useLanguage();
  const router = useRouter();
  const pathname = usePathname();
  const [isScrolled, setIsScrolled] = useState(false);
  const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);

  const navItems = [
    { name: t("nav", "about"), href: "/#about" },
    { name: t("nav", "technology"), href: "/#technology" },
    { name: t("nav", "projects"), href: "/#projects" },
    { name: t("nav", "solutions"), href: "/#solutions" },
    { name: t("nav", "products"), href: "/#products" },
    { name: t("nav", "downloads"), href: "/downloads" },
    { name: t("nav", "contact"), href: "/#contact" },
  ];

  useEffect(() => {
    const handleScroll = () => {
      setIsScrolled(window.scrollY > 50);
    };
    window.addEventListener("scroll", handleScroll);
    return () => window.removeEventListener("scroll", handleScroll);
  }, []);

  // Handle hash scroll after navigation
  useEffect(() => {
    if (pathname === "/" && window.location.hash) {
      const hash = window.location.hash.substring(1);
      setTimeout(() => {
        const element = document.getElementById(hash);
        if (element) {
          element.scrollIntoView({ behavior: "smooth" });
        }
      }, 100);
    }
  }, [pathname]);

  const handleNavClick = (e: React.MouseEvent<HTMLAnchorElement>, href: string) => {
    // If it's not a hash link, let it navigate normally
    if (!href.includes("#")) {
      return;
    }

    e.preventDefault();
    const hash = href.split("#")[1];

    if (pathname === "/") {
      // Already on homepage, just scroll
      const element = document.getElementById(hash);
      if (element) {
        element.scrollIntoView({ behavior: "smooth" });
      }
    } else {
      // Navigate to homepage first, then scroll
      router.push(href);
    }

    setIsMobileMenuOpen(false);
  };

  return (
    <header
      className={`fixed top-0 left-0 right-0 z-50 transition-all duration-300 ${
        isScrolled
          ? "bg-white/95 backdrop-blur-sm shadow-md"
          : "bg-transparent"
      }`}
    >
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="flex items-center justify-between h-16 md:h-20">
          {/* Logo */}
          <Link href="/" className="flex items-center space-x-2">
            <span
              className={`text-2xl font-bold transition-colors ${
                isScrolled ? "text-[#1E3A8A]" : "text-white"
              }`}
            >
              GRANTECH
            </span>
          </Link>

          {/* Desktop Navigation */}
          <nav className="hidden md:flex items-center space-x-6">
            {navItems.map((item) => (
              <a
                key={item.href}
                href={item.href}
                onClick={(e) => handleNavClick(e, item.href)}
                className={`text-sm font-medium transition-colors hover:text-[#3B82F6] ${
                  isScrolled ? "text-gray-700" : "text-white"
                }`}
              >
                {item.name}
              </a>
            ))}
            <LanguageSelector isScrolled={isScrolled} />
          </nav>

          {/* Mobile Menu Button */}
          <div className="flex items-center md:hidden space-x-2">
            <LanguageSelector isScrolled={isScrolled} />
            <button
              className="p-2"
              onClick={() => setIsMobileMenuOpen(!isMobileMenuOpen)}
            >
              {isMobileMenuOpen ? (
                <X
                  className={`w-6 h-6 ${
                    isScrolled ? "text-gray-700" : "text-white"
                  }`}
                />
              ) : (
                <Menu
                  className={`w-6 h-6 ${
                    isScrolled ? "text-gray-700" : "text-white"
                  }`}
                />
              )}
            </button>
          </div>
        </div>

        {/* Mobile Menu */}
        {isMobileMenuOpen && (
          <div className="md:hidden bg-white border-t">
            <nav className="py-4 space-y-2">
              {navItems.map((item) => (
                <a
                  key={item.href}
                  href={item.href}
                  onClick={(e) => handleNavClick(e, item.href)}
                  className="block px-4 py-2 text-gray-700 hover:bg-gray-50 hover:text-[#3B82F6]"
                >
                  {item.name}
                </a>
              ))}
            </nav>
          </div>
        )}
      </div>
    </header>
  );
}