"use client";

import { useState, useEffect } from "react";
import { Menu, X } from "lucide-react";
import Image from "next/image";

const navLinks = [
  { href: "#about", label: "About" },
  { href: "#services", label: "Services" },
  { href: "#projects", label: "Projects" },
  { href: "#gallery", label: "Gallery" },
  { href: "#contact", label: "Contact" },
];

export default function Navigation() {
  const [scrolled, setScrolled] = useState(false);
  const [mobileOpen, setMobileOpen] = useState(false);
  const [activeSection, setActiveSection] = useState("");

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

  // Track active section
  useEffect(() => {
    const observer = new IntersectionObserver(
      (entries) => {
        entries.forEach((entry) => {
          if (entry.isIntersecting) {
            setActiveSection(`#${entry.target.id}`);
          }
        });
      },
      { threshold: 0.3, rootMargin: "-80px 0px -40% 0px" }
    );

    const sections = document.querySelectorAll("section[id]");
    sections.forEach((section) => observer.observe(section));
    return () => observer.disconnect();
  }, []);

  // Lock body scroll when mobile menu is open
  useEffect(() => {
    document.body.style.overflow = mobileOpen ? "hidden" : "";
    return () => { document.body.style.overflow = ""; };
  }, [mobileOpen]);

  return (
    <nav
      className={`fixed top-0 left-0 right-0 z-50 transition-all duration-500 ${
        scrolled
          ? "bg-surface/90 backdrop-blur-xl border-b border-border py-3"
          : "bg-transparent py-5"
      }`}
    >
      <div className="max-w-6xl mx-auto px-6 flex items-center justify-between">
        <a href="#" className="flex items-center gap-3 group">
          <Image
            src="/images/dragon-mark.png"
            alt="Wild Dragon"
            width={28}
            height={28}
            className="brightness-0 invert transition-all duration-300"
          />
          <span className="font-mono text-[11px] tracking-[0.2em] uppercase text-white/80 group-hover:text-white transition-colors duration-300">
            Wild Dragon
          </span>
        </a>

        {/* Desktop nav */}
        <div className="hidden md:flex items-center gap-8">
          {navLinks.map((link) => (
            <a
              key={link.href}
              href={link.href}
              className={`text-[13px] font-medium transition-all duration-200 relative ${
                activeSection === link.href
                  ? "text-accent"
                  : "text-white/50 hover:text-white"
              }`}
            >
              {link.label}
              {activeSection === link.href && (
                <span className="absolute -bottom-1.5 left-0 right-0 h-px bg-accent glow-accent-sm" />
              )}
            </a>
          ))}
          <a
            href="#contact"
            className="ml-2 px-5 py-2 text-[12px] font-medium rounded-md bg-accent text-white hover:bg-accent-light transition-all duration-200 hover:shadow-lg hover:shadow-accent/20"
          >
            Hire Me
          </a>
        </div>

        {/* Mobile toggle */}
        <button
          className="md:hidden relative z-50"
          onClick={() => setMobileOpen(!mobileOpen)}
          aria-label="Toggle menu"
        >
          {mobileOpen ? (
            <X className="text-white" size={22} />
          ) : (
            <Menu className="text-white" size={22} />
          )}
        </button>
      </div>

      {/* Mobile menu - full overlay */}
      <div
        className={`md:hidden fixed inset-0 bg-surface z-40 transition-all duration-300 ${
          mobileOpen
            ? "opacity-100 pointer-events-auto"
            : "opacity-0 pointer-events-none"
        }`}
      >
        <div className="flex flex-col items-center justify-center h-full gap-8">
          {navLinks.map((link, i) => (
            <a
              key={link.href}
              href={link.href}
              onClick={() => setMobileOpen(false)}
              className={`text-2xl font-light text-white/80 hover:text-accent transition-all duration-300 ${
                mobileOpen
                  ? "opacity-100 translate-y-0"
                  : "opacity-0 translate-y-4"
              }`}
              style={{ transitionDelay: mobileOpen ? `${i * 80 + 100}ms` : "0ms" }}
            >
              {link.label}
            </a>
          ))}
          <a
            href="#contact"
            onClick={() => setMobileOpen(false)}
            className={`mt-4 px-8 py-3.5 bg-accent text-white text-base font-medium rounded-md transition-all duration-300 hover:shadow-lg hover:shadow-accent/20 ${
              mobileOpen ? "opacity-100 translate-y-0" : "opacity-0 translate-y-4"
            }`}
            style={{ transitionDelay: mobileOpen ? `${navLinks.length * 80 + 100}ms` : "0ms" }}
          >
            Hire Me
          </a>
        </div>
      </div>
    </nav>
  );
}