import express from "express";
import { createServer as createViteServer } from "vite";
import fs from "fs/promises";
import path from "path";
import { fileURLToPath } from "url";
import { BLOG_POSTS } from "./src/lib/data.ts";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

async function startServer() {
  const app = express();
  const PORT = process.env.PORT ? parseInt(process.env.PORT) : 3000;

  let vite: any;
  if (process.env.NODE_ENV !== "production") {
    vite = await createViteServer({
      server: { middlewareMode: true },
      appType: "custom",
    });
    app.use(vite.middlewares);
  } else {
    // Serve static files from dist/assets and others, but not index.html directly
    app.use(express.static(path.join(process.cwd(), "dist"), { index: false }));
  }

  app.get("/sitemap.xml", (req, res) => {
    const baseUrl = process.env.APP_URL || "https://leonardo.dev";
    
    let xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
  <url><loc>${baseUrl}/</loc><changefreq>weekly</changefreq><priority>1.0</priority></url>
  <url><loc>${baseUrl}/blog</loc><changefreq>daily</changefreq><priority>0.9</priority></url>
  <url><loc>${baseUrl}/curriculo</loc><changefreq>monthly</changefreq><priority>0.8</priority></url>
  <url><loc>${baseUrl}/contato</loc><changefreq>monthly</changefreq><priority>0.8</priority></url>`;

    BLOG_POSTS.forEach((post) => {
      xml += `
  <url><loc>${baseUrl}/blog/${post.slug}</loc><changefreq>monthly</changefreq><priority>0.7</priority></url>`;
    });

    xml += `
</urlset>`;

    res.header("Content-Type", "application/xml");
    res.send(xml);
  });

  app.get("/robots.txt", (req, res) => {
    const baseUrl = process.env.APP_URL || "https://leonardo.dev";
    const txt = `User-agent: *
Allow: /

Sitemap: ${baseUrl}/sitemap.xml`;
    res.header("Content-Type", "text/plain");
    res.send(txt);
  });

  app.get("*", async (req, res) => {
    try {
      let template, render;

      if (process.env.NODE_ENV !== "production") {
        template = await fs.readFile(path.join(__dirname, "index.html"), "utf-8");
        template = await vite.transformIndexHtml(req.originalUrl, template);
      } else {
        template = await fs.readFile(path.join(process.cwd(), "dist", "index.html"), "utf-8");
      }

      // Default tags
      let title = "Leonardo Silva | Front-end Engineer & Designer";
      let description = "Engenheiro de Software & Designer de Interfaces. Construindo experiências web de alta performance.";
      let image = "https://images.unsplash.com/photo-1544725176-7c40e5a71c5e?auto=format&fit=crop&q=80&w=1200&h=630";
      const appUrl = process.env.APP_URL || "https://leonardo.dev";

      // If viewing a post
      if (req.originalUrl.startsWith("/blog/")) {
        const slug = req.originalUrl.split("/")[2];
        const post = BLOG_POSTS.find(p => p.slug === slug);
        if (post) {
          title = `${post.title} | Leonardo Silva`;
          description = post.excerpt;
          if (post.coverImage) {
            image = post.coverImage;
          }
        }
      }

      // Replace generic meta tags in index.html with specific ones
      let html = template
        .replace(/<title>.*<\/title>/i, `<title>${title}</title>`)
        .replace(
          /<!-- INJECT_SEO -->/,
          `
          <meta name="description" content="${description}" />
          
          <!-- Open Graph / Facebook -->
          <meta property="og:type" content="website" />
          <meta property="og:url" content="${appUrl}${req.originalUrl}" />
          <meta property="og:title" content="${title}" />
          <meta property="og:description" content="${description}" />
          <meta property="og:image" content="${image}" />

          <!-- Twitter -->
          <meta property="twitter:card" content="summary_large_image" />
          <meta property="twitter:url" content="${appUrl}${req.originalUrl}" />
          <meta property="twitter:title" content="${title}" />
          <meta property="twitter:description" content="${description}" />
          <meta property="twitter:image" content="${image}" />
          `
        );

      res.status(200).set({ "Content-Type": "text/html" }).end(html);
    } catch (e) {
      if (process.env.NODE_ENV !== "production") {
        vite.ssrFixStacktrace(e as Error);
      }
      console.error(e);
      res.status(500).end((e as Error).message);
    }
  });

  app.listen(PORT, "0.0.0.0", () => {
    console.log(`Server running on http://0.0.0.0:${PORT}`);
  });
}

startServer();