import {NextResponse} from "next/server";

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

interface ProjectsData {
    posts: Project[];
}

interface SitemapRoute {
    url: string;
    lastModified: string;
}

const baseUrl = process.env.NEXT_PUBLIC_BASE_URL || "https://dki.one";

const generateSitemap = async (): Promise<SitemapRoute[]> => {
    try {
        const response = await fetch(`${baseUrl}/api/fetchAllProjects`, {
            headers: {"Cache-Control": "no-cache"},
        });

        if (!response.ok) {
            console.error(`Failed to fetch projects: ${response.statusText}`);
            return [];
        }

        const projectsData = (await response.json()) as ProjectsData;

        // Dynamische Projekt-Routen generieren
        const projectRoutes: SitemapRoute[] = projectsData.posts.map((project) => ({
            url: `${baseUrl}/projects/${project.slug}`,
            lastModified: project.updated_at
                ? new Date(project.updated_at).toISOString()
                : new Date().toISOString(),
        }));

        return [...projectRoutes];
    } catch (error) {
        console.error("Failed to generate sitemap:", error);
        return [];
    }
};

export async function GET() {
    try {
        const sitemap = await generateSitemap();
        return NextResponse.json(sitemap, {
            headers: {"Cache-Control": "no-cache"},
        });
    } catch (error) {
        console.error("Failed to generate sitemap:", error);
        return NextResponse.json(
            {error: "Failed to generate sitemap"},
            {status: 500},
        );
    }
}