import type { Metadata } from "next";
import Link from "next/link";
import { notFound } from "next/navigation";
import { ProductGallery } from "@/components/ProductGallery";
import { ProductMarketplaceCtas } from "@/components/ProductMarketplaceCtas";
import { ProductTabs } from "@/components/ProductTabs";
import { Products } from "@/components/Products";
import { SiteShell } from "@/components/SiteShell";
import { site } from "@/data/home";
import {
  formatCondition,
  formatPrice,
  getUserProductBySlugOrNull,
  getUserProductTechnicalInfo,
  listUserProducts,
  productCategory,
  productTitle,
} from "@/lib/api/user-products";
import { resolveProductGallery } from "@/lib/user-product-gallery";

type PageProps = {
  params: Promise<{ slug: string }>;
};

export async function generateMetadata({
  params,
}: PageProps): Promise<Metadata> {
  const { slug } = await params;
  const product = await getUserProductBySlugOrNull(slug);
  if (!product) return { title: "محصول یافت نشد" };
  const title = productTitle(product);
  const description =
    product.descriptionFa || product.description || product.descriptionEn || title;
  const image = product.imageUrl || product.images?.[0]?.url || undefined;
  return {
    title,
    description,
    openGraph: {
      title,
      description,
      ...(image ? { images: [{ url: image, alt: title }] } : {}),
    },
  };
}

export default async function UserProductDetailPage({ params }: PageProps) {
  const { slug } = await params;
  const product = await getUserProductBySlugOrNull(slug);
  if (!product) notFound();

  const title = productTitle(product);
  const category = productCategory(product);
  const condition = formatCondition(product.condition);
  const price = formatPrice(product.price, product.priceCurrency);
  const gallery = resolveProductGallery(product);
  const city = product.cityNameFa || product.cityName || null;
  const country = product.countryNameFa || product.countryName || null;
  const description =
    product.descriptionFa || product.description || product.descriptionEn;
  const deliveryNotes = product.deliveryNotes ?? product.deliveryNote ?? null;
  const [technicalInfo, similarResult] = await Promise.all([
    getUserProductTechnicalInfo(slug),
    product.categoryId
      ? listUserProducts({
          categoryId: product.categoryId,
          pageSize: 5,
        })
      : Promise.resolve({ items: [], total: 0 }),
  ]);

  const similarProducts = similarResult.items
    .filter((item) => item.id !== product.id)
    .slice(0, 4);

  return (
    <SiteShell
      banner={{
        kicker: "Product Details",
        title,
        description: [category, condition].filter(Boolean).join(" · ") || undefined,
      }}
    >
      <article className="section">
        <div className="container-page">
          <div className="mb-6 text-sm text-muted">
            <Link href="/user-products" className="text-brand hover:underline">
              محصولات
            </Link>
            <span className="mx-2">/</span>
            <span>{title}</span>
          </div>

          <div className="grid gap-8 lg:grid-cols-[1.1fr_0.9fr]">
            <ProductGallery images={gallery} alt={title} />

            <div>
              {product.titleEn ? (
                <p className="font-industrial text-sm tracking-[0.14em] text-brand">
                  {product.titleEn}
                </p>
              ) : null}
              <h2 className="mt-2 text-3xl font-extrabold leading-tight text-brand-ink md:text-4xl">
                {title}
              </h2>
              {category ? (
                <p className="mt-3 text-sm font-bold text-muted">{category}</p>
              ) : null}

              <div className="mt-6 grid gap-3 sm:grid-cols-2">
                {condition ? (
                  <div className="border border-brand/25 bg-brand/[0.06] px-4 py-3">
                    <p className="font-industrial text-[0.65rem] tracking-[0.16em] text-brand">
                      CONDITION
                    </p>
                    <p className="mt-1 text-base font-extrabold text-brand-ink">
                      {condition}
                    </p>
                  </div>
                ) : null}

                {city || country ? (
                  <div className="border border-line bg-[#f7fafc] px-4 py-3">
                    <p className="font-industrial text-[0.65rem] tracking-[0.16em] text-steel">
                      LOCATION
                    </p>
                    <p className="mt-1 text-base font-extrabold text-brand-ink">
                      {[city, country].filter(Boolean).join("، ")}
                    </p>
                  </div>
                ) : null}
              </div>

              {price ? (
                <p
                  dir="ltr"
                  className="font-industrial mt-6 text-left text-2xl font-extrabold tracking-wide text-brand"
                >
                  {price}
                </p>
              ) : (
                <p className="mt-6 text-base font-bold text-muted">
                  قیمت با استعلام
                </p>
              )}

              <div className="mt-8 flex justify-end">
                <a href={`tel:${site.phone}`} className="btn-primary">
                  تماس برای استعلام
                </a>
              </div>
            </div>
          </div>

          <ProductTabs
            description={description}
            technicalNotes={product.technicalNotes}
            deliveryNotes={deliveryNotes}
            technicalValues={product.technicalValues}
            technicalInfo={technicalInfo}
          />

          {similarProducts.length > 0 ? (
            <Products
              embedded
              items={similarProducts}
              total={similarResult.total}
              kicker="Similar Products"
              title="محصولات مشابه"
              description="سایر ماشین‌آلات موجود در همین دسته‌بندی که ممکن است برای شما مناسب باشند."
              showMoreLink={false}
              titleHref={
                product.categoryId
                  ? `/user-products?categoryId=${product.categoryId}`
                  : "/user-products"
              }
              moreLabel="مشاهده همه در این دسته"
            />
          ) : null}

          <ProductMarketplaceCtas />
        </div>
      </article>
    </SiteShell>
  );
}