"use client";

import React, { useState, useEffect } from "react";
import { motion, AnimatePresence } from "framer-motion";
import { MenuIcon, XIcon, Layers } from "lucide-react";
import { cn } from "@/lib/utils";

// Definição de Tipos para consistência de dados
interface NavItem {
  href: string;
  label: string;
}

const navItems: NavItem[] = [
  { href: "#home", label: "Home" },
  { href: "#about", label: "Sobre" },
  { href: "#skills", label: "Habilidades" },
  { href: "#experience", label: "Experiência" },
  { href: "#projects", label: "Projetos" },
  { href: "#contact", label: "Contato" },
];

export function Header() {
  const [isMenuOpen, setIsMenuOpen] = useState(false);
  const [scrolled, setScrolled] = useState(false);

  // Hook de detecção de scroll para mudança de estado do Header
  useEffect(() => {
    const handleScroll = () => {
      setScrolled(window.scrollY > 20);
    };
    window.addEventListener("scroll", handleScroll);
    return () => window.removeEventListener("scroll", handleScroll);
  }, []);

  return (
    <>
      <motion.header
        initial={{ y: -100 }}
        animate={{ y: 0 }}
        className={cn(
          "fixed top-0 left-0 right-0 z-[100] transition-all duration-500 ease-in-out px-6 py-4",
          scrolled 
            ? "bg-black/40 backdrop-blur-xl border-b border-white/5 py-3" 
            : "bg-transparent py-6"
        )}
      >
        <nav className="max-w-7xl mx-auto flex items-center justify-between">
          {/* Logo com Identidade Visual de Engenheiro */}
          <motion.a
            href="#home"
            onClick={(e) => {
              e.preventDefault();
              const element = document.querySelector("#home");
              if (element) {
                element.scrollIntoView({ behavior: "smooth", block: "start" });
              }
            }}
            whileHover={{ scale: 1.05 }}
            className="flex items-center gap-2 cursor-pointer"
          >
            <div className="w-8 h-8 bg-blue-600 rounded-lg flex items-center justify-center shadow-[0_0_15px_rgba(37,99,235,0.4)]">
              <Layers className="w-5 h-5 text-white" />
            </div>
            <span className="text-xl font-black tracking-tighter text-white">
              EVANDRO<span className="text-blue-500">.DEV</span>
            </span>
          </motion.a>

          {/* Desktop Navigation - Focada em Espaçamento Ótimo */}
          <div className="hidden md:flex items-center gap-1 bg-white/5 p-1 rounded-full border border-white/10 backdrop-blur-md">
            {navItems.map((item) => (
              <a
                key={item.href}
                href={item.href}
                onClick={(e) => {
                  e.preventDefault();
                  const element = document.querySelector(item.href);
                  if (element) {
                    element.scrollIntoView({ behavior: "smooth", block: "start" });
                  }
                }}
                className="px-5 py-2 text-xs font-bold uppercase tracking-widest text-slate-300 hover:text-white hover:bg-white/10 rounded-full transition-all duration-300 cursor-pointer"
              >
                {item.label}
              </a>
            ))}
          </div>

          {/* Botão de Ação CTA (Call to Action) */}
          <div className="hidden md:block">
            <a
              href="/Profile.pdf"
              download="Evandro_Fonseca_Junior_CV.pdf"
              className="px-6 py-2 bg-white text-black text-xs font-bold uppercase tracking-widest rounded-full hover:bg-blue-500 hover:text-white transition-all duration-500 inline-block"
            >
              Download CV
            </a>
          </div>

          {/* Mobile Toggle */}
          <button
            onClick={() => setIsMenuOpen(!isMenuOpen)}
            className="md:hidden p-2 text-white bg-white/5 rounded-lg border border-white/10"
          >
            {isMenuOpen ? <XIcon size={20} /> : <MenuIcon size={20} />}
          </button>
        </nav>
      </motion.header>

      {/* Mobile Menu Overlay com Framer Motion para fluidez */}
      <AnimatePresence>
        {isMenuOpen && (
          <motion.div
            initial={{ opacity: 0, x: "100%" }}
            animate={{ opacity: 1, x: 0 }}
            exit={{ opacity: 0, x: "100%" }}
            transition={{ type: "spring", damping: 25, stiffness: 200 }}
            className="fixed inset-0 z-[110] bg-black/95 backdrop-blur-2xl md:hidden flex flex-col items-center justify-center gap-8"
          >
            <button 
              onClick={() => setIsMenuOpen(false)}
              className="absolute top-8 right-8 p-4 text-white/50 hover:text-white"
            >
              <XIcon size={32} />
            </button>
            
            {navItems.map((item, i) => (
              <motion.a
                key={item.href}
                href={item.href}
                initial={{ opacity: 0, y: 20 }}
                animate={{ opacity: 1, y: 0 }}
                transition={{ delay: i * 0.1 }}
                onClick={(e) => {
                  e.preventDefault();
                  setIsMenuOpen(false);
                  const element = document.querySelector(item.href);
                  if (element) {
                    element.scrollIntoView({ behavior: "smooth", block: "start" });
                  }
                }}
                className="text-3xl font-black text-white uppercase tracking-tighter hover:text-blue-500 transition-colors cursor-pointer"
              >
                {item.label}
              </motion.a>
            ))}
            <motion.a
              href="/Profile.pdf"
              download="Evandro_Fonseca_Junior_CV.pdf"
              initial={{ opacity: 0, y: 20 }}
              animate={{ opacity: 1, y: 0 }}
              transition={{ delay: navItems.length * 0.1 }}
              className="mt-8 px-8 py-4 bg-white text-black text-xl font-black uppercase tracking-tighter rounded-full hover:bg-blue-500 hover:text-white transition-all duration-300"
            >
              Download CV
            </motion.a>
          </motion.div>
        )}
      </AnimatePresence>
    </>
  );
}