/**
 * # 路由 /shop/ 全部产品列表页
 * 原站 /shop/ 形态：左栏属性筛选（复选框，URL search params 驱动）+ 主区
 * 「IoT Products / Showing x–y of z results」+ 产品网格 + 分页。
 */
import { createFileRoute, useRouter } from "@tanstack/react-router";
import { getLayoutData, Layout } from "~/components/website/Layout";
import { ProductCard } from "~/components/website/ProductCard";
import { Pagination } from "~/components/website/Pagination";
import { Breadcrumb, BreadcrumbList, BreadcrumbItem, BreadcrumbLink, BreadcrumbPage, BreadcrumbSeparator } from "~/components/ui/breadcrumb";
import { parseCollectionSearch, searchToFilters, filtersToSearch, type CollectionSearch } from "~/components/website/collection-shared";
import { getFilterConfig, listProducts, type FilterState, type ProductListResult } from "~/server/data";
import { useT } from "~/i18n";

export const Route = createFileRoute("/shop")({
  validateSearch: parseCollectionSearch as (search: Record<string, unknown>) => CollectionSearch,
  loaderDeps: ({ search }) => ({ search }),
  loader: async ({ deps }) => {
    const [layout, filterConfig] = await Promise.all([
      getLayoutData(),
      getFilterConfig().catch(() => []),
    ]);
    const list = await listProducts({
      filters: searchToFilters(deps.search),
      page: deps.search.page,
      pageSize: 24,
    }).catch(() => ({ items: [], total: 0, page: 1, pageSize: 24 }) as ProductListResult);
    return { layout, filterConfig, list };
  },
  head: () => ({
    meta: [
      { title: "All Products - DusunIoT" },
      { name: "description", content: "Browse all Dusun IoT gateways and modules." },
    ],
  }),
  component: ShopPage,
});

/** # 函数 组件 /shop/ 页面 */
function ShopPage() {
  const t = useT();
  const data = Route.useLoaderData();
  const search = Route.useSearch();
  const router = useRouter();
  const page = data.list.page;
  const from = (page - 1) * data.list.pageSize + (data.list.items.length ? 1 : 0);
  const to = (page - 1) * data.list.pageSize + data.list.items.length;

  /** # 函数 更新筛选：切换某属性值后 navigate（重置到第 1 页） */
  function toggleFilter(attrSlug: string, valueSlug: string) {
    const filters: FilterState = searchToFilters(search);
    const cur = filters[attrSlug] || [];
    const next = cur.includes(valueSlug) ? cur.filter((v) => v !== valueSlug) : [...cur, valueSlug];
    if (next.length) filters[attrSlug] = next;
    else delete filters[attrSlug];
    router.navigate({ to: "/shop/", search: filtersToSearch(filters, 1) });
  }

  return (
    <Layout layout={data.layout}>
      <div className="site-container">
        <Breadcrumb aria-label="Breadcrumb">
          <BreadcrumbList>
            <BreadcrumbItem><BreadcrumbLink to="/">{t("nav_home")}</BreadcrumbLink></BreadcrumbItem>
            <BreadcrumbSeparator />
            <BreadcrumbItem><BreadcrumbPage>{t("nav_shop")}</BreadcrumbPage></BreadcrumbItem>
          </BreadcrumbList>
        </Breadcrumb>
        <div className="grid grid-cols-1 items-start gap-7 min-[900px]:grid-cols-[250px_1fr]">
          {/* 左栏属性筛选（与原站 /shop/ 一致：仅属性过滤器，无分类树） */}
          <aside>
            {data.filterConfig.map((f) => (
              <div className="mb-[18px] rounded-lg border border-line bg-soft p-4" key={f.slug}>
                <h3 className="m-0 mb-2.5 text-[15px]">{f.name}</h3>
                <ul className="m-0 list-none p-0">
                  {f.values.map((v) => {
                    const checked = (searchToFilters(search)[f.slug] || []).includes(v.slug);
                    return (
                      <li key={v.slug} className="mb-1.5">
                        <label className="flex cursor-pointer items-center gap-2">
                          <input type="checkbox" checked={checked} onChange={() => toggleFilter(f.slug, v.slug)} />
                          <span className="flex-1">{v.value}</span>
                          <span className="text-xs text-muted-foreground">({Number(v.count)})</span>
                        </label>
                      </li>
                    );
                  })}
                  {f.values.length === 0 ? <li className="text-muted-foreground">{t("collection_no_options")}</li> : null}
                </ul>
              </div>
            ))}
          </aside>

          <div>
            <h1 className="mt-0 text-[26px]">{t("shop_iot_products")}</h1>
            <p className="text-muted-foreground">
              {data.list.total > 0 ? t("shop_showing", { from, to, total: data.list.total }) : t("shop_no_results")}
            </p>
            <div className="grid grid-cols-2 gap-[18px] min-[960px]:grid-cols-4">
              {data.list.items.map((p) => (
                <ProductCard key={p.id} p={p} />
              ))}
            </div>
            {data.list.items.length === 0 ? (
              <p className="py-[60px] text-center text-muted-foreground">No products found with the selected filters.</p>
            ) : null}
            <Pagination
              page={page}
              total={data.list.total}
              pageSize={data.list.pageSize}
              makeHref={(n) => (n > 1 ? `/shop/?page=${n}` : "/shop/")}
            />
          </div>
        </div>
      </div>
    </Layout>
  );
}