import type { MetadataRoute } from "next";
import { connection } from "next/server";
import {
  fetchPosts,
  fetchAnnouncementsPage,
  fetchPublishedSitePages,
} from "@/lib/api";
import { canonicalPath, resolveSiteOrigin } from "@/lib/siteUrl";

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  await connection();
  const origin = resolveSiteOrigin();
  if (!origin) {
    console.error("[seo] SITE_URL 缺失或非法，已跳过 sitemap");
    return [];
  }

  const url = (pathname: string) => `${origin}${canonicalPath(pathname)}`;
  const entries: MetadataRoute.Sitemap = [
    { url: url("/"), lastModified: new Date(), changeFrequency: "daily", priority: 1 },
    {
      url: url("/announcements"),
      lastModified: new Date(),
      changeFrequency: "daily",
      priority: 0.7,
    },
    {
      url: url("/leaderboard"),
      lastModified: new Date(),
      changeFrequency: "daily",
      priority: 0.5,
    },
    {
      url: url("/about"),
      lastModified: new Date(),
      changeFrequency: "monthly",
      priority: 0.6,
    },
  ];

  try {
    const { posts } = await fetchPosts(1, 100);
    for (const post of posts) {
      entries.push({
        url: url(`/post/${post.id}`),
        lastModified: new Date(post.created_at),
        changeFrequency: "weekly",
        priority: 0.6,
      });
    }
  } catch {
    /* 忽略 API 错误 */
  }

  try {
    const { announcements } = await fetchAnnouncementsPage(1, 100);
    for (const a of announcements) {
      entries.push({
        url: url(`/announcement/${a.id}`),
        lastModified: new Date(a.updated_at || a.created_at),
        changeFrequency: "weekly",
        priority: 0.5,
      });
    }
  } catch {
    /* 忽略 */
  }

  try {
    const { pages } = await fetchPublishedSitePages();
    for (const p of pages) {
      entries.push({
        url: url(`/p/${p.slug}`),
        lastModified: new Date(p.updated_at || p.created_at),
        changeFrequency: "monthly",
        priority: 0.4,
      });
    }
  } catch {
    /* 忽略 */
  }

  return entries;
}