import type { GetServerSideProps } from "next"
import { supabase } from "../lib/supabase"

const SITE_URL = "https://mesnaldo.com"

const staticPages = [
  { path: "/", priority: "1.0", changefreq: "daily" },

  { path: "/goals", priority: "0.9", changefreq: "daily" },
  { path: "/assists", priority: "0.9", changefreq: "daily" },
  { path: "/who-is-best", priority: "0.9", changefreq: "weekly" },
  { path: "/trophies", priority: "0.9", changefreq: "weekly" },
  { path: "/head-to-head", priority: "0.9", changefreq: "weekly" },

  { path: "/career", priority: "0.8", changefreq: "weekly" },
  { path: "/honours", priority: "0.8", changefreq: "weekly" },
  { path: "/records", priority: "0.8", changefreq: "weekly" },
  { path: "/detailed-stats", priority: "0.8", changefreq: "weekly" },

  { path: "/messi", priority: "0.8", changefreq: "weekly" },
  { path: "/ronaldo", priority: "0.8", changefreq: "weekly" },

  { path: "/blog", priority: "0.8", changefreq: "daily" },

  { path: "/poll", priority: "0.7", changefreq: "daily" },

  { path: "/methodology", priority: "0.7", changefreq: "monthly" },

  { path: "/about", priority: "0.6", changefreq: "monthly" },
  { path: "/faq", priority: "0.6", changefreq: "monthly" },

  { path: "/contact", priority: "0.5", changefreq: "monthly" },

  { path: "/privacy", priority: "0.4", changefreq: "yearly" },
  { path: "/terms", priority: "0.4", changefreq: "yearly" },
]

function escapeXml(value: string) {
  return value
    .replace(/&/g, "&")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&apos;")
}

export const getServerSideProps: GetServerSideProps = async ({ res }) => {
  try {
    const { data: posts, error } = await supabase
      .from("blog_posts")
      .select("slug, published_at, created_at")
      .eq("is_published", true)
      .order("published_at", { ascending: false })

    if (error) {
      console.error("Sitemap blog fetch error:", error)
    }

    const staticUrls = staticPages
      .map(
        (page) => `
  <url>
    <loc>${SITE_URL}${page.path}</loc>
    <changefreq>${page.changefreq}</changefreq>
    <priority>${page.priority}</priority>
  </url>`
      )
      .join("")

    const blogUrls = (posts ?? [])
      .filter(
        (post) =>
          typeof post.slug === "string" &&
          post.slug.trim().length > 0
      )
      .map((post) => {
        const lastModified =
          post.published_at ||
          post.created_at

        return `
  <url>
    <loc>${SITE_URL}/blog/${escapeXml(post.slug)}</loc>
    ${
      lastModified
        ? `<lastmod>${new Date(lastModified).toISOString()}</lastmod>`
        : ""
    }
    <changefreq>monthly</changefreq>
    <priority>0.7</priority>
  </url>`
      })
      .join("")

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

    res.setHeader("Content-Type", "application/xml")
    res.setHeader(
      "Cache-Control",
      "public, s-maxage=3600, stale-while-revalidate=86400"
    )

    res.write(sitemap)
    res.end()

    return {
      props: {},
    }
  } catch (error) {
    console.error("Sitemap generation error:", error)

    const fallbackSitemap = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${staticPages
  .map(
    (page) => `
  <url>
    <loc>${SITE_URL}${page.path}</loc>
    <changefreq>${page.changefreq}</changefreq>
    <priority>${page.priority}</priority>
  </url>`
  )
  .join("")}
</urlset>`

    res.setHeader("Content-Type", "application/xml")
    res.write(fallbackSitemap)
    res.end()

    return {
      props: {},
    }
  }
}

export default function Sitemap() {
  return null
}