import SiteHeader from "@/components/home/SiteHeader";
import SiteFooter from "@/components/home/SiteFooter";
import LeatherBanner from "@/components/home/LeatherBanner";
import PartnerCta from "@/components/home/PartnerCta";
import ProductListHero from "@/components/products/ProductListHero";
import ProductFilters from "@/components/products/ProductFilters";
import ProductGrid from "@/components/products/ProductGrid";
import ProductPagination from "@/components/products/ProductPagination";
import ProductEmptyState from "@/components/products/ProductEmptyState";
import ProductListExtras from "@/components/products/ProductListExtras";
import { LIST_PAGE_META } from "@/data/products";
import { mapHomeSlots } from "@/lib/map-home-slots";
import {
  fetchPublicWebsiteSlots,
  itemsForSlot,
} from "@/lib/website-slots";
import { getStorefrontProducts } from "@/lib/products-api";
import {
  fetchPublicCategories,
  mapCategoriesToMegaTabs,
  resolveHomeCategoryStrip,
  type ApiCategoryNode,
} from "@/lib/categories-api";
import {
  paginateItems,
  parseProductListQuery,
  type ProductListQuery,
} from "@/lib/products-query";

type PageProps = {
  searchParams: Promise<ProductListQuery>;
};

function findCategory(
  nodes: ApiCategoryNode[],
  id: string,
): ApiCategoryNode | null {
  for (const node of nodes) {
    if (String(node.id) === id) return node;
    const child = findCategory(node.children ?? [], id);
    if (child) return child;
  }
  return null;
}

function findCategoryName(
  nodes: ApiCategoryNode[],
  id: string,
): string | null {
  return findCategory(nodes, id)?.nameFa ?? null;
}

export default async function ProductsPage({ searchParams }: PageProps) {
  const raw = await searchParams;
  const query = parseProductListQuery(raw);
  const [slotItems, products, apiCategories] = await Promise.all([
    fetchPublicWebsiteSlots(),
    getStorefrontProducts({
      name: query.q || undefined,
      categoryId: query.cat || undefined,
      minPrice: query.minPrice,
      maxPrice: query.maxPrice,
      featuredSlot: query.sale ? "promo-1" : undefined,
    }),
    fetchPublicCategories(),
  ]);
  const home = mapHomeSlots(slotItems);
  const megaTabs = mapCategoriesToMegaTabs(
    apiCategories,
    home.megaTabs.map((t) => ({ image: t.image })),
  );

  const stripCategories = resolveHomeCategoryStrip(
    apiCategories,
    home.categories,
    itemsForSlot(slotItems, "category-strip").length > 0,
  );

  const catNode = query.cat ? findCategory(apiCategories, query.cat) : null;
  const categorySeo = catNode?.seoDescription?.trim()
    ? {
        nameFa: catNode.nameFa,
        nameEn: catNode.nameEn,
        description: catNode.seoDescription.trim(),
      }
    : null;

  const { pageItems, totalPages, page, total } = paginateItems(
    products,
    query.page,
  );
  const categoryLabel = query.cat
    ? findCategoryName(apiCategories, query.cat)
    : null;
  const hasFilters = Boolean(
    query.q || query.cat || query.min || query.max || query.sale,
  );

  const heroTitle = query.sale
    ? "فروش ویژه"
    : query.q
      ? `جستجو: ${query.q}`
      : categoryLabel
        ? categoryLabel
        : LIST_PAGE_META.titleFa;

  const heroEn = query.sale
    ? "Special Sale"
    : query.q
      ? "Search results"
      : categoryLabel
        ? ""
        : LIST_PAGE_META.titleEn;

  const breadcrumbs = query.sale
    ? [
        { label: "خانه", href: "/" },
        { label: "محصولات", href: "/products" },
        { label: "فروش ویژه" },
      ]
    : query.q
      ? [
          { label: "خانه", href: "/" },
          { label: "محصولات", href: "/products" },
          { label: "جستجو" },
        ]
      : LIST_PAGE_META.breadcrumbs;

  return (
    <main className="home-page min-h-dvh bg-white text-ink">
      <div className="relative">
        <SiteHeader megaTabs={megaTabs.length ? megaTabs : home.megaTabs} />
        <ProductListHero
          titleFa={heroTitle}
          titleEn={heroEn}
          heroImage={home.heroSlides[0]?.image || LIST_PAGE_META.heroImage}
          breadcrumbs={breadcrumbs}
        />
      </div>

      <div className="mt-6 space-y-6 sm:mt-8 lg:mt-[60px]">
        <ProductFilters
          basePath="/products"
          initial={{
            q: query.q,
            cat: query.cat,
            min: query.min,
            max: query.max,
            sale: query.sale,
          }}
          categoryLabel={categoryLabel}
        />
        <div className="space-y-3 sm:space-y-4">
          {total === 0 ? (
            <ProductEmptyState
              title={
                hasFilters
                  ? "محصولی با این فیلترها پیدا نشد"
                  : "محصولی موجود نیست"
              }
              description={
                hasFilters
                  ? "فیلترها را تغییر دهید یا همه را پاک کنید تا محصولات بیشتری ببینید."
                  : "به‌زودی محصولات جدید اضافه می‌شوند."
              }
            />
          ) : (
            <>
              <ProductGrid products={pageItems} />
              <ProductPagination
                page={page}
                totalPages={totalPages}
                basePath="/products"
                query={{
                  q: query.q,
                  cat: query.cat,
                  min: query.min,
                  max: query.max,
                  sale: query.sale,
                }}
              />
            </>
          )}
        </div>
      </div>

      <LeatherBanner
        image={home.leather.image}
        nameFa={home.leather.nameFa}
        nameEn={home.leather.nameEn}
        linkText={home.leather.linkText}
        link={home.leather.link}
      />
      <PartnerCta />

      <ProductListExtras
        stripCategories={stripCategories}
        about={home.about}
        categorySeo={categorySeo}
      />

      <SiteFooter paymentBadges={home.paymentBadges} />
    </main>
  );
}