import type { Metadata } from 'next';
import { publicApi } from '@/lib/services';
import { ProductCard } from '@/components/front/ProductCard';
import type { ProductCategory } from '@/lib/types';

export const metadata: Metadata = {
  title: '产品中心',
  description: '查看我们的全部产品与解决方案。',
};

export const revalidate = 60;

interface PageProps {
  searchParams: { categoryId?: string; keyword?: string; page?: string };
}

export default async function ProductsPage({ searchParams }: PageProps) {
  const page = Number(searchParams.page ?? 1);
  const categoryId = searchParams.categoryId ? Number(searchParams.categoryId) : undefined;

  const [categories, productsRes] = await Promise.all([
    publicApi.getProductCategories().catch(() => [] as ProductCategory[]),
    publicApi
      .getProducts({
        page,
        pageSize: 12,
        categoryId,
        keyword: searchParams.keyword,
      })
      .catch(() => ({ list: [], total: 0, page, pageSize: 12 })),
  ]);

  return (
    <div className="container-page py-12">
      <h1 className="text-3xl font-bold text-gray-900">产品中心</h1>
      <p className="mt-2 text-sm text-gray-500">
        共 {productsRes.total} 款产品
      </p>

      {/* 分类筛选 */}
      <div className="mt-6 flex flex-wrap gap-2">
        <a
          href="/products"
          className={`rounded-full border px-3 py-1 text-sm ${
            !categoryId
              ? 'border-brand-600 bg-brand-50 text-brand-700'
              : 'border-gray-200 text-gray-600 hover:border-brand-300'
          }`}
        >
          全部
        </a>
        {categories.map((c) => (
          <a
            key={c.id}
            href={`/products?categoryId=${c.id}`}
            className={`rounded-full border px-3 py-1 text-sm ${
              categoryId === c.id
                ? 'border-brand-600 bg-brand-50 text-brand-700'
                : 'border-gray-200 text-gray-600 hover:border-brand-300'
            }`}
          >
            {c.name}
          </a>
        ))}
      </div>

      {/* 列表 */}
      <div className="mt-8 grid grid-cols-1 gap-6 sm:grid-cols-2 lg:grid-cols-3">
        {productsRes.list.map((p) => (
          <ProductCard key={p.id} product={p} />
        ))}
      </div>
      {productsRes.list.length === 0 && (
        <div className="mt-8 flex h-32 items-center justify-center rounded-md border border-dashed text-sm text-gray-400">
          暂无产品
        </div>
      )}

      {/* 分页 */}
      {productsRes.total > 12 && (
        <Pagination
          page={page}
          total={productsRes.total}
          pageSize={12}
          baseQuery={{ categoryId: searchParams.categoryId, keyword: searchParams.keyword }}
        />
      )}
    </div>
  );
}

function Pagination({
  page,
  total,
  pageSize,
  baseQuery,
}: {
  page: number;
  total: number;
  pageSize: number;
  baseQuery: Record<string, string | undefined>;
}) {
  const totalPages = Math.ceil(total / pageSize);
  const buildHref = (p: number) => {
    const qs = new URLSearchParams({
      ...(baseQuery as Record<string, string>),
      page: String(p),
    }).toString();
    return `/products?${qs}`;
  };
  return (
    <div className="mt-8 flex items-center justify-center gap-2">
      <a
        href={buildHref(Math.max(1, page - 1))}
        className={`rounded border px-3 py-1 text-sm ${
          page <= 1 ? 'pointer-events-none opacity-50' : 'hover:bg-gray-50'
        }`}
      >
        上一页
      </a>
      <span className="text-sm text-gray-600">
        {page} / {totalPages}
      </span>
      <a
        href={buildHref(Math.min(totalPages, page + 1))}
        className={`rounded border px-3 py-1 text-sm ${
          page >= totalPages ? 'pointer-events-none opacity-50' : 'hover:bg-gray-50'
        }`}
      >
        下一页
      </a>
    </div>
  );
}