import { getAllAlbums } from "@/content/photos/albums";
import { getSettings } from "@/content/settings/settings";
import { getAlbumRoute } from "@/lib/routing";
import type { APIRoute } from "astro";
import minifyXML from "minify-xml";

export const GET = (async ({ params }) => {
    const settings = await getSettings();

    if (!settings.photo.enabled) {
        return new Response(null, {
            status: 204,
            statusText: "Not Found"
        });
    }

    const currentPage = params.page;

    const albums = await getAllAlbums(settings);
    const selectedAlbums = albums.slice(
        ((Number(currentPage) - 1) * settings.sitemap.perPage),
        Number(currentPage) * settings.sitemap.perPage - 1
    );

    let pages: SitemapPage[] = [];

    selectedAlbums.forEach((album) => {
        pages.push({
            url: getAlbumRoute(settings.photo, album),
            lastModified: album.lastModified
        });
    });

    let sitemapContent = `
    <?xml version="1.0" encoding="UTF-8"?>
    <sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
    ${pages.map((page) => `
        <sitemap>
            <loc>${settings.website.domainName}${page.url}</loc>
            <lastmod>${page.lastModified.toISOString()}</lastmod>
        </sitemap>
    `).join('')}
    </sitemapindex>
    `;

    return new Response(minifyXML(sitemapContent), {
        status: 200,
        statusText: "OK",
        headers: {
            "Content-Type": "application/xml"
        }
    });
}) satisfies APIRoute;

export async function getStaticPaths() {
    const settings = await getSettings();
    const albums = await getAllAlbums(settings);

    const albumCount = albums.length;
    const perPage = settings.sitemap.perPage;
    const pages = Math.ceil(albumCount / perPage);

    let items: any[] = [];

    for (let i = 0; i < pages; i++) {
        items.push({ params: { page: (i + 1).toString() } });
    }

    return items;
}