"use client";

import Link from "next/link";
import { usePathname, useSearchParams } from "next/navigation";
import { ChevronDown, Heart, LayoutGrid, Menu, ShoppingCart, UserRound } from "lucide-react";
import { Suspense, useEffect, useMemo, useRef, useState } from "react";
import { AccountDialog } from "@/components/account/account-dialog";
import { PredictiveSearch } from "@/components/search/predictive-search";
import { Button } from "@/components/ui/button";
import { Sheet, SheetContent, SheetDescription, SheetHeader, SheetTitle } from "@/components/ui/sheet";
import type { Category, Product } from "@/lib/headless/types";
import { useCartStore } from "@/store/cart-store";
import { useCustomerStore } from "@/store/customer-store";
import { useWishlistStore } from "@/store/wishlist-store";

type CategoryNode = Category & { children: Category[] };

function buildCategoryTree(categories: Category[]): CategoryNode[] {
  return categories
    .filter((category) => !category.parentId)
    .map((root) => ({
      ...root,
      children: categories.filter((category) => category.parentId === root.id),
    }));
}

export function Navbar({ products, categories }: { products: Product[]; categories: Category[] }) {
  const [menuOpen, setMenuOpen] = useState(false);
  const [accountOpen, setAccountOpen] = useState(false);
  const items = useCartStore((state) => state.items);
  const cartHydrated = useCartStore((state) => state.hasHydrated);
  const openCart = useCartStore((state) => state.openCart);
  const wishlistProducts = useWishlistStore((state) => state.products);
  const wishlistHydrated = useWishlistStore((state) => state.hasHydrated);
  const openWishlist = useWishlistStore((state) => state.openWishlist);
  const count = cartHydrated ? items.reduce((sum, item) => sum + item.quantity, 0) : 0;
  const wishlistCount = wishlistHydrated ? wishlistProducts.length : 0;
  const customer = useCustomerStore((state) => state.customer);
  const customerHydrated = useCustomerStore((state) => state.hasHydrated);
  const isLoggedIn = customerHydrated && customer !== null;

  const tree = useMemo(() => buildCategoryTree(categories), [categories]);
  // Derivado de los productos reales (no de un endpoint de colecciones):
  // solo aparecen colecciones que de verdad tienen productos hoy.
  const collections = useMemo(
    () => [...new Set(products.map((product) => product.collection).filter(Boolean))],
    [products],
  );

  return (
    <header className="sticky top-0 z-40 border-b border-slate-200/80 bg-white/95 shadow-sm backdrop-blur-xl">
      <div className="bg-ari-marino px-4 py-2 text-center text-xs font-black text-white sm:text-sm">
        Paga tus compras a cuotas · Envíos nacionales · <span className="underline decoration-ari-coral-claro decoration-2 underline-offset-2">Compra segura con ARI</span>
      </div>

      <div className="relative overflow-visible bg-white">
        <div className="pointer-events-none absolute inset-x-0 top-0 h-1 bg-ari-coral-claro" />
        {/* ADR 0010: en mobile/tablet el buscador se movio a una segunda
            fila a todo el ancho, debajo de logo+iconos (antes competia por
            espacio en una sola fila con el grid_[auto_1fr_auto] y quedaba
            angosto/recortado). En desktop (lg+) se mantiene la fila unica
            original -- ahi sobra espacio y partirla en dos solo alargaria
            el header sin necesidad. */}
        <div className="mx-auto max-w-7xl px-4 py-3 lg:py-4">
          <div className="flex items-center justify-between gap-4 lg:grid lg:grid-cols-[auto_1fr_auto] lg:gap-8">
            {/* Isotipo circular con icono + wordmark integrados (como en la
                version previa a ADR 0008), pedido explicito del usuario en
                vez del lockup rectangular. logo-ari.svg (rectangular) se
                mantiene para el footer. */}
            <Link href="/" aria-label="ARI shopping" className="shrink-0">
              {/* eslint-disable-next-line @next/next/no-img-element -- vector propio, next/image no optimiza SVG sin habilitar dangerouslyAllowSVG */}
              <img src="/images/brand/logo-ari-circular.svg" alt="ARI shopping" className="size-16 lg:size-20" width={200} height={200} />
            </Link>
            <div className="hidden lg:block">
              <PredictiveSearch />
            </div>
            <div className="flex items-center gap-2">
              {/* Antes escondido en mobile (solo alcanzable desde el menu
                  hamburguesa) -- pedido explicito del usuario: visible
                  siempre en el header, con un punto verde cuando hay sesion
                  iniciada (mismo patron que el badge de cantidad del
                  carrito/favoritos, pero de presencia, no de conteo). */}
              <Button variant="outline" size="icon" aria-label={isLoggedIn ? "Mi cuenta (sesión iniciada)" : "Mi cuenta"} className="relative inline-flex border-slate-300 bg-white text-slate-900 hover:border-ari-coral hover:bg-ari-coral/10" onClick={() => setAccountOpen(true)}>
                <UserRound />
                {isLoggedIn && <span className="absolute -right-1 -top-1 size-3 rounded-full border-2 border-white bg-emerald-500" />}
              </Button>
              <Button variant="outline" size="icon" aria-label={`Favoritos: ${wishlistCount}`} className="relative hidden border-slate-300 bg-white text-slate-900 hover:border-ari-coral hover:bg-ari-coral/10 sm:inline-flex" onClick={openWishlist}>
                <Heart />
                {wishlistCount > 0 && <span className="absolute -right-1.5 -top-1.5 grid size-5 place-items-center rounded-full bg-ari-marino text-[10px] font-black text-white">{wishlistCount}</span>}
              </Button>
              <Button variant="primary" size="icon" onClick={openCart} aria-label={`Carrito con ${count} productos`} className="relative">
                <ShoppingCart />
                <span className="absolute -right-2 -top-2 grid size-6 place-items-center rounded-full bg-ari-marino text-[11px] font-black text-white">{count}</span>
              </Button>
            </div>
          </div>
          <div className="mt-3 lg:hidden">
            <PredictiveSearch />
          </div>
        </div>
      </div>

      <Suspense fallback={<DesktopCategoryNavigationFallback tree={tree} onOpenMenu={() => setMenuOpen(true)} />}>
        <DesktopCategoryNavigation tree={tree} onOpenMenu={() => setMenuOpen(true)} />
      </Suspense>

      <Sheet open={menuOpen} onOpenChange={setMenuOpen}>
        <SheetContent side="left" className="max-w-sm">
          <SheetHeader>
            <SheetTitle>Explora ARI</SheetTitle>
            <SheetDescription>Categorías y colecciones del catálogo.</SheetDescription>
          </SheetHeader>
          <div className="flex-1 overflow-y-auto p-6">
            <p className="mb-3 text-xs font-black uppercase tracking-[.16em] text-ari-coral">Categorías</p>
            <div className="grid gap-2">
              <Suspense fallback={<MobileCategoryLinksFallback tree={tree} onNavigate={() => setMenuOpen(false)} />}>
                <MobileCategoryLinks tree={tree} onNavigate={() => setMenuOpen(false)} />
              </Suspense>
            </div>
            {collections.length > 0 && (
              <>
                <p className="mb-3 mt-8 text-xs font-black uppercase tracking-[.16em] text-ari-marino">Colecciones</p>
                <div className="flex flex-wrap gap-2">
                  {collections.map((collection) => <Link key={collection} href={`/catalog?collection=${encodeURIComponent(collection)}`} onClick={() => setMenuOpen(false)} className="rounded-full bg-slate-100 px-4 py-2 text-sm font-bold hover:bg-ari-coral/10 hover:text-ari-coral">{collection}</Link>)}
                </div>
              </>
            )}
            <div className="mt-8 grid grid-cols-2 gap-3 sm:hidden">
              <Button variant="outline" onClick={() => { setMenuOpen(false); setAccountOpen(true); }}><UserRound className="size-4" />Cuenta</Button>
              <Button variant="outline" onClick={() => { setMenuOpen(false); openWishlist(); }}><Heart className="size-4" />Favoritos</Button>
            </div>
          </div>
        </SheetContent>
      </Sheet>

      <AccountDialog open={accountOpen} onOpenChange={setAccountOpen} />
    </header>
  );
}

function useCategoryNavigationState() {
  const pathname = usePathname();
  const searchParams = useSearchParams();
  const currentCategory = searchParams.get("category") ?? "";
  const isCatalog = pathname === "/catalog";

  return {
    isAllActive: isCatalog && !currentCategory,
    isActive: (name: string) => isCatalog && currentCategory === name,
  };
}

function pillClass(active: boolean): string {
  return `shrink-0 rounded-full px-4 py-2 text-sm font-extrabold transition ${
    active
      ? "bg-white text-ari-marino shadow-lg shadow-black/10"
      : "text-white/90 hover:bg-white/10 hover:text-white"
  }`;
}

function mobileLinkClass(active: boolean): string {
  return `rounded-2xl border px-4 py-3 font-extrabold transition ${
    active
      ? "border-ari-coral bg-ari-coral/5 text-ari-coral"
      : "border-slate-200 hover:border-ari-coral/50 hover:bg-ari-coral/5"
  }`;
}

function DesktopCategoryNavigation({ tree, onOpenMenu }: { tree: CategoryNode[]; onOpenMenu: () => void }) {
  const { isActive, isAllActive } = useCategoryNavigationState();
  return <CategoryNavBar tree={tree} onOpenMenu={onOpenMenu} isActive={isActive} isAllActive={isAllActive} />;
}

function DesktopCategoryNavigationFallback({ tree, onOpenMenu }: { tree: CategoryNode[]; onOpenMenu: () => void }) {
  return <CategoryNavBar tree={tree} onOpenMenu={onOpenMenu} isActive={() => false} isAllActive={false} />;
}

function CategoryNavBar({
  tree,
  onOpenMenu,
  isActive,
  isAllActive,
}: {
  tree: CategoryNode[];
  onOpenMenu: () => void;
  isActive: (name: string) => boolean;
  isAllActive: boolean;
}) {
  return (
    <nav className="bg-ari-marino text-white">
      <div className="relative mx-auto flex max-w-7xl items-center gap-1 px-4 py-2">
        <Button
          variant="ghost"
          size="icon"
          onClick={onOpenMenu}
          aria-label="Abrir menú principal"
          className="mr-2 shrink-0 text-white hover:bg-white/10"
        >
          <Menu />
        </Button>

        <DepartmentsMegaMenu tree={tree} isActive={isActive} />

        <Link href="/catalog" prefetch={false} aria-current={isAllActive ? "page" : undefined} className={pillClass(isAllActive)}>
          Todo
        </Link>
      </div>
    </nav>
  );
}

function DepartmentsMegaMenu({ tree, isActive }: { tree: CategoryNode[]; isActive: (name: string) => boolean }) {
  const [open, setOpen] = useState(false);
  const containerRef = useRef<HTMLDivElement>(null);
  const closeTimer = useRef<ReturnType<typeof setTimeout> | null>(null);

  const cancelClose = () => {
    if (closeTimer.current) {
      clearTimeout(closeTimer.current);
      closeTimer.current = null;
    }
  };
  // Delay corto en vez de cerrar al toque: aunque el gap entre el boton y
  // el panel ya se elimino (antes era la causa real -- el panel es
  // absolute y no suma a la altura del contenedor, asi que un mt-1 ahi
  // dejaba una franja muerta que cerraba el menu a mitad de camino,
  // reportado en vivo), este margen extra tolera movimientos rapidos o en
  // diagonal cerca del borde sin reabrir nada raro.
  const scheduleClose = () => {
    cancelClose();
    closeTimer.current = setTimeout(() => setOpen(false), 200);
  };

  useEffect(() => {
    if (!open) return;
    function handlePointerDown(event: PointerEvent) {
      if (containerRef.current && !containerRef.current.contains(event.target as Node)) setOpen(false);
    }
    function handleKeyDown(event: KeyboardEvent) {
      if (event.key === "Escape") setOpen(false);
    }
    document.addEventListener("pointerdown", handlePointerDown);
    document.addEventListener("keydown", handleKeyDown);
    return () => {
      document.removeEventListener("pointerdown", handlePointerDown);
      document.removeEventListener("keydown", handleKeyDown);
    };
  }, [open]);

  useEffect(() => () => cancelClose(), []);

  const openNow = () => {
    cancelClose();
    setOpen(true);
  };

  return (
    <div ref={containerRef} className="shrink-0" onMouseEnter={openNow} onMouseLeave={scheduleClose}>
      <button
        type="button"
        onClick={() => setOpen((value) => !value)}
        aria-expanded={open}
        aria-haspopup="true"
        className={`flex items-center gap-1.5 ${pillClass(open)}`}
      >
        <LayoutGrid className="size-4" />
        Departamentos
        <ChevronDown className={`size-3.5 opacity-70 transition-transform ${open ? "rotate-180" : ""}`} />
      </button>

      {open && (
        <div className="absolute left-0 top-full z-50 max-h-[80vh] w-[min(92vw,64rem)] overflow-y-auto rounded-2xl border border-white/10 bg-ari-marino p-6 shadow-2xl">
          <div className="grid grid-cols-2 gap-x-6 gap-y-5 sm:grid-cols-3 lg:grid-cols-6">
            {tree.map((root) => (
              <div key={root.id}>
                <Link
                  href={`/catalog?category=${encodeURIComponent(root.name)}`}
                  prefetch={false}
                  aria-current={isActive(root.name) ? "page" : undefined}
                  onClick={() => setOpen(false)}
                  className={`block text-sm font-black uppercase tracking-wide transition ${
                    isActive(root.name) ? "text-ari-coral-claro" : "text-white hover:text-ari-coral-claro"
                  }`}
                >
                  {root.name}
                </Link>
                {root.children.length > 0 && (
                  <ul className="mt-2.5 grid gap-1.5">
                    {root.children.map((child) => (
                      <li key={child.id}>
                        <Link
                          href={`/catalog?category=${encodeURIComponent(child.name)}`}
                          prefetch={false}
                          aria-current={isActive(child.name) ? "page" : undefined}
                          onClick={() => setOpen(false)}
                          className={`block text-sm transition ${isActive(child.name) ? "font-bold text-ari-coral-claro" : "text-white/70 hover:text-white"}`}
                        >
                          {child.name}
                        </Link>
                      </li>
                    ))}
                  </ul>
                )}
              </div>
            ))}
          </div>
        </div>
      )}
    </div>
  );
}

function MobileCategoryLinks({ tree, onNavigate }: { tree: CategoryNode[]; onNavigate: () => void }) {
  const { isActive, isAllActive } = useCategoryNavigationState();

  return (
    <>
      <Link
        href="/catalog"
        prefetch={false}
        aria-current={isAllActive ? "page" : undefined}
        onClick={onNavigate}
        className={mobileLinkClass(isAllActive)}
      >
        Todo el catálogo
      </Link>

      {tree.map((root) => (
        <div key={root.id} className="contents">
          <Link
            href={`/catalog?category=${encodeURIComponent(root.name)}`}
            prefetch={false}
            aria-current={isActive(root.name) ? "page" : undefined}
            onClick={onNavigate}
            className={mobileLinkClass(isActive(root.name))}
          >
            {root.name}
          </Link>
          {root.children.map((child) => (
            <Link
              key={child.id}
              href={`/catalog?category=${encodeURIComponent(child.name)}`}
              prefetch={false}
              aria-current={isActive(child.name) ? "page" : undefined}
              onClick={onNavigate}
              className={`${mobileLinkClass(isActive(child.name))} ml-4 text-sm`}
            >
              {child.name}
            </Link>
          ))}
        </div>
      ))}
    </>
  );
}

function MobileCategoryLinksFallback({ tree, onNavigate }: { tree: CategoryNode[]; onNavigate: () => void }) {
  return (
    <>
      <Link href="/catalog" prefetch={false} onClick={onNavigate} className={mobileLinkClass(false)}>
        Todo el catálogo
      </Link>

      {tree.map((root) => (
        <div key={root.id} className="contents">
          <Link href={`/catalog?category=${encodeURIComponent(root.name)}`} prefetch={false} onClick={onNavigate} className={mobileLinkClass(false)}>
            {root.name}
          </Link>
          {root.children.map((child) => (
            <Link
              key={child.id}
              href={`/catalog?category=${encodeURIComponent(child.name)}`}
              prefetch={false}
              onClick={onNavigate}
              className={`${mobileLinkClass(false)} ml-4 text-sm`}
            >
              {child.name}
            </Link>
          ))}
        </div>
      ))}
    </>
  );
}