tksm-ndy-mc-proj-web/app/sitemap.ts

import type { MetadataRoute } from "next";

import { getAllAnnouncements } from "@/lib/announcements";

export const dynamic = "force-static";

const SITE_URL =
  process.env.NEXT_PUBLIC_SITE_URL ??
  process.env.SITE_URL ??
  "https://mc.neody.ad.jp";

function toAbsoluteUrl(pathname: string): string {
  return new URL(pathname, SITE_URL).toString();
}

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const announcements = await getAllAnnouncements();

  const staticRoutes: MetadataRoute.Sitemap = [
    {
      url: toAbsoluteUrl("/"),
      lastModified: new Date(),
      changeFrequency: "weekly",
      priority: 1,
    },
    {
      url: toAbsoluteUrl("/announcements/"),
      lastModified: new Date(),
      changeFrequency: "daily",
      priority: 0.8,
    },
  ];

  const announcementRoutes: MetadataRoute.Sitemap = announcements.map((item) => {
    const parsedDate = new Date(item.date);

    return {
      url: toAbsoluteUrl(`/announcements/${item.slug}/`),
      lastModified: Number.isNaN(parsedDate.getTime()) ? new Date() : parsedDate,
      changeFrequency: "monthly",
      priority: 0.7,
    };
  });

  return [...staticRoutes, ...announcementRoutes];
}