import getData from "@/api";

export default async function sitemap() {
  // Main page information
  const site = await getData("site", {
    fields: ["updatedAt"],
    populate: {
      edition: {
        fields: ["id", "updatedAt", "publishedAt"],
        populate: {
          programs: true,
          fields: ["type", "updatedAt", "publishedAt"],
        },
      },
    },
  });

  const edition = site.data?.attributes.edition.data;
  const siteLastModified =
    site && edition
      ? new Date(
          Math.max(
            new Date(site.data?.attributes.updatedAt),
            new Date(edition.attributes.updatedAt)
          )
        )
      : new Date();

  // Programs information
  const programs = (edition?.attributes.programs.data ?? []).filter(
    (p) => p.attributes.publishedAt !== null
  );

  // Editions information
  const editions = await getData("editions", { fields: ["id", "updatedAt"] });
  const previousEditions = editions.data?.filter(
    (e) => e.id !== edition.id && e.attributes.publishedAt !== null
  );
  const editionsLastModifiedTimestamp = Math.max(
    ...(previousEditions ?? []).map((e) => new Date(e.attributes.updatedAt))
  );

  const editionsLastModified =
    editionsLastModifiedTimestamp === -Infinity
      ? siteLastModified
      : new Date(editionsLastModifiedTimestamp);

  return [
    {
      url: `${process.env.NEXT_PUBLIC_ORIGIN}`,
      lastModified: siteLastModified,
      changeFrequency: "yearly",
      prority: 1,
    },
    ...(programs ?? []).map((p) => ({
      url: `${process.env.NEXT_PUBLIC_ORIGIN}/prog/${p.attributes.type}`,
      lastModified: new Date(p.attributes.updatedAt),
      changeFrequency: "yearly",
      priority: 0.8,
    })),
    {
      url: `${process.env.NEXT_PUBLIC_ORIGIN}/editions`,
      lastModified: editionsLastModified,
      changeFrequency: "yearly",
      priority: 0.6,
    },
    ...(previousEditions ?? []).map((e) => ({
      url: `${process.env.NEXT_PUBLIC_ORIGIN}/editions/${e.id}`,
      lastModified: new Date(e.attributes.updatedAt),
      changeFrequency: "yearly",
      priority: 0.5,
    })),
  ];
}