/**
 * Generate sitemap.xml for TailTrails.
 * Run: node scripts/generate-sitemap.mjs
 * Output: public/sitemap.xml (copied to dist/ by the subsequent vite build)
 *
 * Blog slugs are auto-discovered from src/blogs/posts/*.tsx so the sitemap
 * can't drift from the actual posts.
 */
import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const SITE_URL = "https://tailtrails.club";
const POSTS_DIR = path.resolve(__dirname, "..", "src", "blogs", "posts");
const TODAY = new Date().toISOString().split("T")[0];

const staticRoutes = [
  { path: "/", priority: "1.0", changefreq: "weekly" },
  { path: "/blog", priority: "0.9", changefreq: "weekly" },
  { path: "/compare", priority: "0.9", changefreq: "weekly" },
  { path: "/compare/dog-walking-apps-compared", priority: "0.8", changefreq: "monthly" },
  { path: "/compare/tailtrails-vs-wooftrax", priority: "0.7", changefreq: "monthly" },
  { path: "/compare/tailtrails-vs-tractive", priority: "0.7", changefreq: "monthly" },
  { path: "/compare/tailtrails-vs-alltrails", priority: "0.7", changefreq: "monthly" },
  { path: "/compare/tailtrails-vs-fitbark", priority: "0.7", changefreq: "monthly" },
  { path: "/compare/tailtrails-vs-pitpat", priority: "0.7", changefreq: "monthly" },
  { path: "/privacy", priority: "0.3", changefreq: "yearly" },
  { path: "/terms", priority: "0.3", changefreq: "yearly" },
  { path: "/forget-me", priority: "0.3", changefreq: "yearly" },
  { path: "/finalize-forget-me", priority: "0.3", changefreq: "yearly" },
  // /download is a redirect stub — not indexed, omitted from sitemap.
];

const blogSlugs = fs.existsSync(POSTS_DIR)
  ? fs.readdirSync(POSTS_DIR).filter((f) => f.endsWith(".tsx")).map((f) => f.replace(/\.tsx$/, ""))
  : [];
const blogRoutes = blogSlugs.map((slug) => ({
  path: `/blog/${slug}`,
  priority: "0.7",
  changefreq: "monthly",
}));

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

const xmlUrls = allRoutes
  .map(
    (r) => `  <url>
    <loc>${SITE_URL}${r.path}</loc>
    <lastmod>${TODAY}</lastmod>
    <changefreq>${r.changefreq}</changefreq>
    <priority>${r.priority}</priority>
  </url>`
  )
  .join("\n");

const sitemap = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${xmlUrls}
</urlset>`;

const outputPath = path.join(__dirname, "..", "public", "sitemap.xml");
fs.writeFileSync(outputPath, sitemap, "utf8");
console.log(`✅ Sitemap generated: ${outputPath} (${allRoutes.length} URLs)`);