"use client";

import { useState, useEffect } from "react";
import Link from "next/link";
import { User, ShoppingBag, Menu, Phone } from "lucide-react";
import { NavDropdown } from "./NavDropdown";
import { GlobalSearch } from "./GlobalSearch";
import { MobileMenu } from "./MobileMenu";
import { useCartStore } from "@/lib/cart-store";
import { companyDetails } from "@/content/company";
import { cn } from "@/lib/utils";

export function Header() {
  const [isScrolled, setIsScrolled] = useState(false);
  const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
  const [mounted, setMounted] = useState(false);

  const cartItems = useCartStore((state) => state.items);

  useEffect(() => {
    setMounted(true);
    const handleScroll = () => {
      if (window.scrollY > 40) {
        setIsScrolled(true);
      } else {
        setIsScrolled(false);
      }
    };

    window.addEventListener("scroll", handleScroll);
    return () => window.removeEventListener("scroll", handleScroll);
  }, []);

  const cartCount = mounted
    ? cartItems.reduce((total, item) => total + item.quantity, 0)
    : 0;

  const acSections = [
    {
      title: "Klimatyzatory",
      items: [
        {
          label: "Ścienne split",
          href: "/sklep?category=scienne",
          description: "Klasyczne jednostki ścienne do mieszkań",
        },
        {
          label: "Multisplit",
          href: "/sklep?category=multisplit",
          description: "Systemy wielopokojowe (2-5 pomieszczeń)",
        },
        {
          label: "Przenośne",
          href: "/sklep?category=przenosne",
          description: "Mobilne chłodzenie bez stałej instalacji",
        },
        {
          label: "Kasetonowe i konsolowe",
          href: "/sklep?category=kasetonowe",
          description: "Modele biurowe i przypodłogowe",
        },
      ],
    },
    {
      title: "Usługi HVAC",
      items: [
        {
          label: "Montaż klimatyzacji",
          href: "/klimatyzacja",
          description: "Kompleksowy dobór, audyt i montaż",
        },
        {
          label: "Serwis i czyszczenie",
          href: "/klimatyzacja#serwis",
          description: "Odgrzybianie, naprawy i przeglądy",
        },
      ],
    },
    {
      title: "Montaż w Twoim mieście",
      items: [
        { label: "Klimatyzacja Wrocław", href: "/klimatyzacja/wroclaw", description: "Montaż i serwis we Wrocławiu" },
        { label: "Klimatyzacja Legnica", href: "/klimatyzacja/legnica", description: "Obsługujemy Legnicę i okolice" },
        { label: "Klimatyzacja Wałbrzych", href: "/klimatyzacja/walbrzych", description: "Montaż w Wałbrzychu" },
        { label: "Klimatyzacja Jelenia Góra", href: "/klimatyzacja/jelenia-gora", description: "Dolny Śląsk — południe" },
        { label: "→ Wszystkie miasta", href: "/klimatyzacja#miasta", description: "Cały Dolny Śląsk" },
      ],
    },
  ];



  return (
    <>
      {/* ----------------- DESKTOP: TOP BAR ----------------- */}
      <div className="hidden lg:block bg-muted py-2 border-b border-border/50">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 flex items-center justify-between">
          {/* Top Bar Left: Logo */}
          <Link href="/" className="shrink-0 flex items-center gap-3">
            <span className="text-2xl font-bold font-heading text-primary">
              {companyDetails.shortName}
              <span className="text-accent">.</span>
            </span>
            <span className="text-xs text-muted-foreground font-medium border-l border-border pl-3">
              Klimatyzacja i pompy ciepła
            </span>
          </Link>

          {/* Top Bar Right: Phone & Icons */}
          <div className="flex items-center gap-6">
            <a
              href={`tel:${companyDetails.phoneRaw}`}
              className="flex items-center gap-2 text-sm font-semibold text-primary hover:text-accent transition-colors whitespace-nowrap"
            >
              <Phone className="size-4 text-accent" />
              <span>{companyDetails.phone}</span>
            </a>

            <div className="flex items-center gap-1">
              <GlobalSearch />
              <Link href="/koszyk" className="p-2 text-primary hover:text-accent hover:bg-background rounded-lg transition-colors relative outline-none" aria-label="Koszyk">
                <ShoppingBag className="size-5" />
                {cartCount > 0 && (
                  <span className="absolute top-0 right-0 bg-accent text-white text-[10px] font-bold size-4 rounded-full flex items-center justify-center translate-x-0.5 -translate-y-0.5">
                    {cartCount}
                  </span>
                )}
              </Link>
            </div>
          </div>
        </div>
      </div>

      {/* ----------------- DESKTOP: NAV BAR (STICKY) ----------------- */}
      <header
        className={cn(
          "hidden lg:block sticky top-0 z-40 bg-background transition-all duration-300 border-b border-border",
          isScrolled ? "shadow-md py-2" : "py-4"
        )}
      >
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 flex items-center justify-between">
          {/* Main Navigation */}
          <nav className="flex items-center gap-8">
            {isScrolled && (
              <Link href="/" className="shrink-0 flex items-center mr-2">
                <span className="text-xl font-bold font-heading text-primary">
                  {companyDetails.shortName}
                  <span className="text-accent">.</span>
                </span>
              </Link>
            )}

            <NavDropdown
              label="Klimatyzacja"
              triggerHref="/klimatyzacja"
              sections={acSections}
              align="left"
            />
            <Link
              href="/pompy-ciepla"
              className="text-sm font-medium text-primary hover:text-accent transition-colors"
            >
              Pompy ciepła
            </Link>

            <Link
              href="/realizacje"
              className="text-sm font-medium text-primary hover:text-accent transition-colors"
            >
              Realizacje
            </Link>
            <Link
              href="/blog"
              className="text-sm font-medium text-primary hover:text-accent transition-colors"
            >
              Blog
            </Link>
            <Link
              href="/o-nas"
              className="text-sm font-medium text-primary hover:text-accent transition-colors"
            >
              O nas
            </Link>
            <Link
              href="/kontakt"
              className="text-sm font-medium text-primary hover:text-accent transition-colors"
            >
              Kontakt
            </Link>
          </nav>

          {/* CTA Button */}
          <Link href="/kontakt" className="hidden lg:flex">
            <button className="btn btn-primary font-bold">
              Darmowa wycena
            </button>
          </Link>
        </div>
      </header>

      {/* ----------------- MOBILE: HEADER (STICKY) ----------------- */}
      <header
        className={cn(
          "lg:hidden sticky top-0 z-40 bg-background border-b border-border transition-all duration-300",
          isScrolled ? "shadow-md py-3" : "py-4"
        )}
      >
        <div className="max-w-7xl mx-auto px-4 sm:px-6 flex items-center justify-between">
          {/* Mobile Logo */}
          <Link href="/" className="shrink-0 flex items-center">
            <span className="text-xl font-bold font-heading text-primary">
              {companyDetails.shortName}
              <span className="text-accent">.</span>
            </span>
          </Link>

          {/* Mobile Icons (Cart + Hamburger) */}
          <div className="flex items-center gap-3">
            <Link href="/koszyk" className="p-2 text-primary hover:text-accent hover:bg-muted transition-colors rounded-lg relative outline-none" aria-label="Koszyk">
              <ShoppingBag className="size-5" />
              {cartCount > 0 && (
                <span className="absolute top-0 right-0 bg-accent text-white text-[10px] font-bold size-4 rounded-full flex items-center justify-center translate-x-0.5 -translate-y-0.5">
                  {cartCount}
                </span>
              )}
            </Link>

            <button
              onClick={() => setIsMobileMenuOpen(true)}
              className="p-2 text-primary hover:text-accent hover:bg-muted transition-colors rounded-lg outline-none"
              aria-label="Otwórz menu"
            >
              <Menu className="size-6" />
            </button>
          </div>
        </div>
      </header>

      {/* ----------------- MOBILE MENU DRAWER ----------------- */}
      <MobileMenu
        isOpen={isMobileMenuOpen}
        onClose={() => setIsMobileMenuOpen(false)}
      />
    </>
  );
}