import { NextResponse } from "next/server";

interface Project {
  slug: string;
  updated_at?: string; // Optional timestamp for last modification
}

interface ProjectsData {
  posts: Project[];
}

export const dynamic = "force-dynamic";
export const runtime = "nodejs"; // Force Node runtime

const GHOST_API_URL = process.env.GHOST_API_URL || "http://192.168.179.31:2368";
const GHOST_API_KEY = process.env.GHOST_API_KEY;

// Funktion, um die XML für die Sitemap zu generieren
function generateXml(sitemapRoutes: { url: string; lastModified: string }[]) {
  const xmlHeader = '<?xml version="1.0" encoding="UTF-8"?>';
  const urlsetOpen =
    '<urlset xmlns="https://www.sitemaps.org/schemas/sitemap/0.9">';
  const urlsetClose = "</urlset>";

  const urlEntries = sitemapRoutes
    .map(
      (route) => `
    <url>
      <loc>${route.url}</loc>
      <lastmod>${route.lastModified}</lastmod>
      <changefreq>monthly</changefreq>
      <priority>0.8</priority>
    </url>`,
    )
    .join("");

  return `${xmlHeader}${urlsetOpen}${urlEntries}${urlsetClose}`;
}

export async function GET() {
  const baseUrl = process.env.NEXT_PUBLIC_BASE_URL || "https://dki.one";

  // Statische Routen
  const staticRoutes = [
    {
      url: `${baseUrl}/`,
      lastModified: new Date().toISOString(),
      priority: 1,
      changeFreq: "weekly",
    },
    {
      url: `${baseUrl}/legal-notice`,
      lastModified: new Date().toISOString(),
      priority: 0.5,
      changeFreq: "yearly",
    },
    {
      url: `${baseUrl}/privacy-policy`,
      lastModified: new Date().toISOString(),
      priority: 0.5,
      changeFreq: "yearly",
    },
  ];

  try {
    const response = await fetch(
      `${GHOST_API_URL}/ghost/api/content/posts/?key=${GHOST_API_KEY}&limit=all`,
    );
    if (!response.ok) {
      console.error(`Failed to fetch posts: ${response.statusText}`);
      return new NextResponse(generateXml(staticRoutes), {
        headers: { "Content-Type": "application/xml" },
      });
    }
    const projectsData = (await response.json()) as ProjectsData;
    const projects = projectsData.posts;

    // Dynamische Projekt-Routen generieren
    const sitemapRoutes = projects.map((project) => {
      const lastModified = project.updated_at || new Date().toISOString();
      return {
        url: `${baseUrl}/projects/${project.slug}`,
        lastModified,
        priority: 0.8,
        changeFreq: "monthly",
      };
    });

    const allRoutes = [...staticRoutes, ...sitemapRoutes];

    // Rückgabe der Sitemap im XML-Format
    return new NextResponse(generateXml(allRoutes), {
      headers: { "Content-Type": "application/xml" },
    });
  } catch (error) {
    console.log("Failed to fetch posts from Ghost:", error);
    // Rückgabe der statischen Routen, falls Fehler auftritt
    return new NextResponse(generateXml(staticRoutes), {
      headers: { "Content-Type": "application/xml" },
    });
  }
}