import type { MetadataRoute } from "next";
import { siteConfig } from "@/lib/site-config";
import {
  listIndustries,
  listProjects,
  listPublishedPosts,
  listServices,
  listSolutions,
} from "@/lib/data";

const BASE = siteConfig.url;

export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const [posts, services, solutions, projects, industries] = await Promise.all([
    listPublishedPosts({ limit: 200 }),
    listServices(),
    listSolutions(),
    listProjects({ limit: 200 }),
    listIndustries(),
  ]);

  const staticRoutes: MetadataRoute.Sitemap = [
    { url: `${BASE}/`, changeFrequency: "weekly", priority: 1 },
    { url: `${BASE}/hizmetler`, changeFrequency: "monthly", priority: 0.9 },
    { url: `${BASE}/cozumler`, changeFrequency: "monthly", priority: 0.9 },
    { url: `${BASE}/projeler`, changeFrequency: "monthly", priority: 0.8 },
    { url: `${BASE}/blog`, changeFrequency: "daily", priority: 0.8 },
    { url: `${BASE}/hakkimizda`, changeFrequency: "yearly", priority: 0.6 },
    { url: `${BASE}/iletisim`, changeFrequency: "yearly", priority: 0.7 },
    { url: `${BASE}/site-analizi`, changeFrequency: "yearly", priority: 0.6 },
    { url: `${BASE}/cerez-politikasi`, changeFrequency: "yearly", priority: 0.2 },
  ];

  const toEntry = (
    path: string,
    updatedAt?: string,
    priority = 0.7,
  ): MetadataRoute.Sitemap[number] => ({
    url: `${BASE}${path}`,
    lastModified: updatedAt ? new Date(updatedAt) : undefined,
    changeFrequency: "weekly",
    priority,
  });

  return [
    ...staticRoutes,
    ...posts.map((p) => toEntry(`/blog/${p.slug}`, p.$updatedAt, 0.7)),
    ...services.map((s) => toEntry(`/hizmetler/${s.slug}`, s.$updatedAt, 0.8)),
    ...solutions.map((s) => toEntry(`/cozumler/${s.slug}`, s.$updatedAt, 0.8)),
    ...projects.map((p) => toEntry(`/projeler/${p.slug}`, p.$updatedAt, 0.7)),
    ...industries.map((i) => toEntry(`/sektor/${i.slug}`, i.$updatedAt, 0.6)),
  ];
}