import ParallaxHero from "@/app/[locale]/blog/ParallaxHero";
import TablerEyeFilled from "@/components/icons/eye";
import { Link as I18nLink, Locale, LOCALES } from "@/i18n/routing";
import { getPosts } from "@/lib/getBlogs";
import { constructMetadata } from "@/lib/metadata";
import dayjs from "dayjs";
import { Metadata } from "next";
import { getTranslations } from "next-intl/server";

type Params = Promise<{ locale: string }>;

type SearchParams = { page?: string; type?: string };

type MetadataProps = {
  params: Params;
};

export async function generateMetadata({
  params,
}: MetadataProps): Promise<Metadata> {
  const { locale } = await params;
  const t = await getTranslations({ locale, namespace: "Blog" });

  return constructMetadata({
    page: "Blog",
    title: t("title"),
    description: t("description"),
    locale: locale as Locale,
    path: `/blog`,
    canonicalUrl: `/blog`,
  });
}

export default async function Page({
  params,
  searchParams,
}: {
  params: Params;
  searchParams?: SearchParams;
}) {
  const { locale } = await params;
  let { posts } = await getPosts(locale);

  const t = await getTranslations("Blog");

  // 分类筛选（公司新闻/专家访谈/行业动态/公告）
  const type = (searchParams?.type || "").toLowerCase();
  const typeLabelMap: Record<string, string> = {
    company: "公司新闻",
    experts: "专家访谈",
    industry: "行业动态",
    notice: "公告",
  };
  const typeLabel = typeLabelMap[type];
  if (type) {
    posts = posts.filter((p) => {
      const metaType = String((p.metadata as any)?.type || "").toLowerCase();
      const tags: string[] = (p.tags as any) || [];
      const hitMeta = metaType === type;
      const hitTag = Array.isArray(tags) && tags.some((t) => String(t).toLowerCase() === type);
      return hitMeta || hitTag;
    });
  }

  const pageRaw = searchParams?.page;
  const page = Math.max(1, parseInt(pageRaw || "1", 10));
  const pageSize = 10;
  const totalPages = Math.max(1, Math.ceil(posts.length / pageSize));
  const start = (page - 1) * pageSize;
  const end = start + pageSize;
  const pagePosts = posts.slice(start, end);

  return (
    <div className="w-full">
      <ParallaxHero />

      {/* 顶部操作区：标签 + 面包屑 */}
      <div className="container mx-auto px-4">
        <div className="flex flex-col md:flex-row md:items-center md:justify-between gap-4 mt-4">
          <div className="flex gap-3">
            <button className="px-4 py-2 rounded-md border bg-white text-gray-700 shadow-sm hover:bg-gray-50">
              投资者保护
            </button>
            <button className="px-4 py-2 rounded-md border bg-white text-gray-700 shadow-sm hover:bg-gray-50">
              公司公告
            </button>
          </div>
          <div className="flex items-center gap-2 text-sm text-gray-500">
            <I18nLink href="/" prefetch={false} className="hover:underline">
              首页
            </I18nLink>
            <span>/</span>
            <I18nLink href="/blog" prefetch={false} className="hover:underline">
              新闻中心
            </I18nLink>
            {typeLabel && (
              <>
                <span>/</span>
                <span className="text-gray-700">{typeLabel}</span>
              </>
            )}
          </div>
        </div>

        {/* 列表 */}
        <div className="mt-4">
          {pagePosts.map((post) => {
            const year = dayjs(post.date).format("YYYY");
            const monthDay = dayjs(post.date).format("MM-DD");
            const views = (post.metadata?.views as number) || 0;
            return (
              <I18nLink
                key={post.slug}
                href={`/blog${post.slug}`}
                prefetch={false}
                className="block rounded-md mb-4 bg-gray-100 px-6 py-5 transition-all duration-200 shadow hover:bg-gray-200 hover:translate-y-[1px] hover:shadow-inner active:translate-y-[2px] active:shadow-inner focus:outline-none focus:ring-1 focus:ring-gray-300"
              >
                <div className="flex items-center">
                  <div className="flex-1 pr-4">
                    <div className="text-base md:text-lg font-medium text-gray-800">
                      {post.title}
                    </div>
                    <div className="mt-2 text-xs text-gray-600 flex items-center gap-1">
                      <TablerEyeFilled className="w-4 h-4" />
                      访问量：{views}
                    </div>
                  </div>
                  <div className="w-24 md:w-28 text-right">
                    <div className="text-xs text-gray-500">{year}</div>
                    <div className="text-2xl md:text-3xl font-bold text-gray-500">{monthDay}</div>
                  </div>
                </div>
              </I18nLink>
            );
          })}
        </div>

        <div className="my-6 flex items-center justify-center gap-2">
          <I18nLink
            href={`/blog?page=${Math.max(1, page - 1)}`}
            prefetch={false}
            className={`px-2.5 py-1 border rounded-sm text-sm ${
              page === 1 ? "bg-gray-100 text-gray-400" : "bg-white hover:bg-gray-50"
            }`}
          >
            {"<"}
          </I18nLink>
          {(() => {
            const items: (number | string)[] = [];
            const showTotal = totalPages;
            const maxNumbers = 4;
            const startNum = 1;
            const endNum = Math.min(showTotal, maxNumbers);
            for (let n = startNum; n <= endNum; n++) items.push(n);
            if (showTotal > maxNumbers + 1) items.push("...");
            if (showTotal > maxNumbers) items.push(showTotal);
            return items.map((it, idx) => {
              if (typeof it === "string")
                return (
                  <span key={`dot-${idx}`} className="px-2.5 py-1 text-sm text-gray-500">
                    {it}
                  </span>
                );
              const isActive = it === page;
              return (
                <I18nLink
                  key={it}
                  href={`/blog?page=${it}`}
                  prefetch={false}
                  className={`px-2.5 py-1 border rounded-sm text-sm ${
                    isActive
                      ? "bg-red-600 text-white border-red-600"
                      : "bg-white hover:bg-gray-50"
                  }`}
                >
                  {it}
                </I18nLink>
              );
            });
          })()}
          <I18nLink
            href={`/blog?page=${Math.min(totalPages, page + 1)}`}
            prefetch={false}
            className={`px-2.5 py-1 border rounded-sm text-sm ${
              page === totalPages ? "bg-gray-100 text-gray-400" : "bg-white hover:bg-gray-50"
            }`}
          >
            {">"}
          </I18nLink>
          <span className="ml-2 text-sm text-gray-600">跳往</span>
          <form action="/blog" method="get" className="flex items-center gap-1">
            <input
              type="number"
              name="page"
              min={1}
              max={totalPages}
              defaultValue={page}
              className="w-14 h-7 border rounded-sm px-2 text-sm"
            />
            <button className="px-2.5 h-7 border rounded-sm text-sm bg-white hover:bg-gray-50" type="submit">
              前往
            </button>
            <span className="text-sm text-gray-600">页</span>
          </form>
        </div>
      </div>
    </div>
  );
}

export async function generateStaticParams() {
  return LOCALES.map((locale) => ({ locale }));
}