import { MetadataRoute } from "next";
import { getAllPosts } from "../src/lib/posts";
import { technologies } from "./technologies/[slug]/data";

/**
 * Sitemap Generator
 *
 * Standard Next.js 15 App Router sitemap generation.
 * This file dynamically generates /sitemap.xml
 */
export default async function sitemap(): Promise<MetadataRoute.Sitemap> {
  const allPosts = await getAllPosts();
  const baseUrl = process.env.NEXT_PUBLIC_BASE_URL || "https://mintel.me";

  // 1. Core Pages
  const routes = [
    "",
    "/about",
    "/blog",
    "/case-studies",
    "/case-studies/klz-cables",
    "/contact",
    "/websites",
  ].map((route) => ({
    url: `${baseUrl}${route}`,
    lastModified: new Date(),
    changeFrequency: "monthly" as const,
    priority: route === "" ? 1.0 : 0.8,
  }));

  // 2. Dynamic Blog Posts
  const blogRoutes = allPosts.map((post) => ({
    url: `${baseUrl}/blog/${post.slug}`,
    lastModified: new Date(post.date),
    changeFrequency: "monthly" as const,
    priority: 0.7,
  }));

  // 3. Technology Detail Pages
  const techRoutes = Object.keys(technologies).map((slug) => ({
    url: `${baseUrl}/technologies/${slug}`,
    lastModified: new Date(),
    changeFrequency: "monthly" as const,
    priority: 0.6,
  }));

  // 4. Tag Pages
  const allTags = [...new Set(allPosts.flatMap((post) => post.tags))];
  const tagRoutes = allTags.map((tag) => ({
    url: `${baseUrl}/tags/${tag}`,
    lastModified: new Date(),
    changeFrequency: "weekly" as const,
    priority: 0.3,
  }));

  return [...routes, ...blogRoutes, ...techRoutes, ...tagRoutes];
}