"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { useEffect, useState } from "react";

const links = [
  { href: "/", label: "Home" },
  { href: "/uit", label: "UIT" },
  { href: "/faq", label: "FAQ" },
  { href: "/contact", label: "Contact" },
];

export default function Nav() {
  const pathname = usePathname();
  const [scrolled, setScrolled] = useState(false);
  const [menuOpen, setMenuOpen] = useState(false);

  useEffect(() => {
    const onScroll = () => setScrolled(window.scrollY > 20);
    window.addEventListener("scroll", onScroll, { passive: true });
    return () => window.removeEventListener("scroll", onScroll);
  }, []);

  return (
    <header
      className="fixed top-0 left-0 right-0 z-50 transition-all duration-300"
      style={{
        background: scrolled ? "rgba(10,10,10,0.85)" : "transparent",
        backdropFilter: scrolled ? "blur(12px)" : "none",
        borderBottom: scrolled ? "1px solid #222222" : "1px solid transparent",
      }}
    >
      <div className="max-w-6xl mx-auto px-6 h-16 flex items-center justify-between">
        {/* Logo */}
        <Link href="/" className="flex items-center gap-2 group">
          <span
            className="text-sm font-semibold tracking-widest uppercase"
            style={{ color: "#ffffff", letterSpacing: "0.15em" }}
          >
            Verimund
          </span>
          <span
            className="text-sm font-light tracking-widest uppercase"
            style={{ color: "#888888", letterSpacing: "0.15em" }}
          >
            Solutions
          </span>
        </Link>

        {/* Desktop nav */}
        <nav className="hidden md:flex items-center gap-8">
          {links.map(({ href, label }) => {
            const active = pathname === href;
            return (
              <Link
                key={href}
                href={href}
                className="text-sm transition-colors duration-200"
                style={{
                  color: active ? "#ffffff" : "#888888",
                  fontWeight: active ? 500 : 400,
                }}
                onMouseEnter={(e) => (e.currentTarget.style.color = "#ffffff")}
                onMouseLeave={(e) =>
                  (e.currentTarget.style.color = active ? "#ffffff" : "#888888")
                }
              >
                {label}
              </Link>
            );
          })}
        </nav>

        {/* Mobile hamburger */}
        <button
          className="md:hidden flex flex-col gap-1.5 p-2"
          onClick={() => setMenuOpen(!menuOpen)}
          aria-label="Toggle menu"
        >
          <span
            className="block w-5 h-px transition-all duration-200"
            style={{
              background: "#ffffff",
              transform: menuOpen ? "rotate(45deg) translate(2px, 2px)" : "none",
            }}
          />
          <span
            className="block w-5 h-px transition-all duration-200"
            style={{
              background: "#ffffff",
              opacity: menuOpen ? 0 : 1,
            }}
          />
          <span
            className="block w-5 h-px transition-all duration-200"
            style={{
              background: "#ffffff",
              transform: menuOpen ? "rotate(-45deg) translate(2px, -2px)" : "none",
            }}
          />
        </button>
      </div>

      {/* Mobile menu */}
      {menuOpen && (
        <div
          className="md:hidden border-t px-6 py-4 flex flex-col gap-4"
          style={{ background: "#0a0a0a", borderColor: "#222222" }}
        >
          {links.map(({ href, label }) => (
            <Link
              key={href}
              href={href}
              className="text-sm"
              style={{ color: pathname === href ? "#ffffff" : "#888888" }}
              onClick={() => setMenuOpen(false)}
            >
              {label}
            </Link>
          ))}
        </div>
      )}
    </header>
  );
}
