const API_URL = process.env.NEXT_PUBLIC_API_URL;
const MAIN_DOMAIN = 'https://nobat724.com';
const PER_SITEMAP = 1000;

export async function generateSitemaps() {
    if (!API_URL) return [{ id: 0 }];

    try {
        const res = await fetch(`${API_URL}/api/v1/clinics?page=1&limit=1`, {
            next: { revalidate: 86400 },
        });
        if (!res.ok) return [{ id: 0 }];
        const json = await res.json();
        const total = json?.meta?.totalRecords || 0;
        const pageCount = Math.max(1, Math.ceil(total / PER_SITEMAP));
        return Array.from({ length: pageCount }, (_, id) => ({ id }));
    } catch {
        return [{ id: 0 }];
    }
}

export default async function sitemap({ id }) {
    if (!API_URL) return [];

    try {
        const res = await fetch(`${API_URL}/api/v1/clinics?page=${id + 1}&limit=${PER_SITEMAP}`, {
            next: { revalidate: 3600 },
        });
        if (!res.ok) return [];
        const json = await res.json();
        const clinics = json?.data || [];
        return clinics
            .filter((c) => c?.uuid)
            .map((c) => ({
                url: `${MAIN_DOMAIN}/clinic/${c.uuid}`,
                lastModified: new Date(),
                changeFrequency: 'weekly',
                priority: 0.7,
            }));
    } catch {
        return [];
    }
}