const fs = require("fs");
const path = require("path");
const { SitemapStream, streamToPromise } = require("sitemap");

// ✅ My Dosa Place — Production domain
const hostname = "https://mydosaplace.ca";

// ✅ Next.js is configured with trailingSlash: true (see next.config.ts)
const addTrailingSlash = true;

// 🔧 Utility: Add trailing slash only for "directory-like" URLs
const shouldAddSlash = (url) => {
  // Keep "/" as-is
  if (url === "/") return false;
  // Don't touch file-like URLs (has extension, e.g. .xml, .json)
  if (/\.[a-z0-9]{2,6}(\?.*)?$/i.test(url)) return false;
  return true;
};

const formatUrl = (url) => {
  // Normalize to leading slash
  if (!url.startsWith("/")) url = "/" + url;

  if (addTrailingSlash && shouldAddSlash(url) && !url.endsWith("/")) {
    return url + "/";
  }
  if (!addTrailingSlash && url.endsWith("/") && url !== "/") {
    return url.slice(0, -1);
  }
  return url;
};

const staticLinks = [
  // Home — highest priority, changes daily
  { url: "/",            changefreq: "daily",   priority: 1.0 },

  // Core pages
  { url: "/menu/",       changefreq: "weekly",  priority: 0.9 },
  { url: "/about/",      changefreq: "monthly", priority: 0.7 },
  { url: "/contact/",    changefreq: "monthly", priority: 0.7 },
  { url: "/reservation/",changefreq: "weekly",  priority: 0.8 },

  // Blog listing
  { url: "/blog/",       changefreq: "weekly",  priority: 0.7 },
];

const blogPosts = [
  { slug: "dosa-in-waterloo-guide" },
  { slug: "south-indian-restaurant-waterloo" },
  { slug: "vegan-friendly-south-indian-food" },
];

const blogLinks = blogPosts.map((post) => ({
  url: `/blog/${post.slug}/`,
  changefreq: "weekly",
  priority: 0.6,
}));


const allLinks = [...staticLinks, ...blogLinks].map((link) => ({
  ...link,
  url: formatUrl(link.url),
}));

async function generateSitemap() {
  try {
    const sitemap = new SitemapStream({ hostname });
    const writeStream = fs.createWriteStream(
      path.resolve(__dirname, "../public/sitemap.xml")
    );

    sitemap.pipe(writeStream);

    console.log("📦 Writing URLs to sitemap:");
    allLinks.forEach((link) => {
      console.log(" -", hostname + link.url);
      sitemap.write(link);
    });

    sitemap.end();
    await streamToPromise(sitemap);

    console.log("\n✅ sitemap.xml created successfully!");
    console.log(`   Total URLs: ${allLinks.length}`);
    console.log(`   Output: public/sitemap.xml`);
  } catch (error) {
    console.error("❌ Error creating sitemap.xml:", error);
  }
}

generateSitemap();