import type { MetadataRoute } from "next";
import { fetchPosts, fetchAnnouncementsPage, fetchOverview } from "@/lib/api";

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const baseUrl = "http://localhost:3000";
  const entries: MetadataRoute.Sitemap = [
    { url: `${baseUrl}/`, lastModified: new Date(), changeFrequency: "daily", priority: 1 },
    {
      url: `${baseUrl}/announcements`,
      lastModified: new Date(),
      changeFrequency: "daily",
      priority: 0.7,
    },
  ];

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

  // 公开单页列表 API 尚未提供：用 overview 侧栏页近似收录已发布且展示中的页面
  try {
    const overview = await fetchOverview();
    for (const p of overview.sidebar_pages ?? []) {
      entries.push({
        url: `${baseUrl}/p/${p.slug}`,
        lastModified: new Date(),
        changeFrequency: "monthly",
        priority: 0.4,
      });
    }
  } catch {
    /* 忽略 */
  }

  return entries;
}