import { type Express } from "express";
import { createServer as createViteServer, createLogger } from "vite";
import { type Server } from "http";
import viteConfig from "../vite.config";
import fs from "fs";
import path from "path";
import { nanoid } from "nanoid";
import { storage } from "./storage";

const viteLogger = createLogger();

function escapeHtml(str: string): string {
  return str.replace(/&/g, "&amp;").replace(/"/g, "&quot;").replace(/</g, "&lt;").replace(/>/g, "&gt;");
}

function ogImageUrl(coverImage: string, baseUrl: string): string {
  if (!coverImage) return "";
  let imgPath = coverImage;
  if (imgPath.endsWith(".webp")) {
    imgPath = imgPath.replace(/\.webp$/, ".jpg");
  }
  return imgPath.startsWith("http") ? imgPath : `${baseUrl}${imgPath}`;
}

function stripExistingMeta(html: string): string {
  html = html.replace(/<meta\s+property="og:[^"]*"[^>]*>\s*/gi, "");
  html = html.replace(/<meta\s+name="twitter:[^"]*"[^>]*>\s*/gi, "");
  html = html.replace(/<meta\s+name="description"[^>]*>\s*/gi, "");
  html = html.replace(/<meta\s+name="keywords"[^>]*>\s*/gi, "");
  html = html.replace(/<link\s+rel="canonical"[^>]*>\s*/gi, "");
  return html;
}

export async function setupVite(server: Server, app: Express) {
  const serverOptions = {
    middlewareMode: true,
    hmr: { server, path: "/vite-hmr" },
    allowedHosts: true as const,
  };

  const vite = await createViteServer({
    ...viteConfig,
    configFile: false,
    customLogger: {
      ...viteLogger,
      error: (msg, options) => {
        viteLogger.error(msg, options);
        process.exit(1);
      },
    },
    server: serverOptions,
    appType: "custom",
  });

  app.use(vite.middlewares);

  app.use("/{*path}", async (req, res, next) => {
    const url = req.originalUrl;
    const canonicalBase = "https://folx.tv";

    try {
      const clientTemplate = path.resolve(
        import.meta.dirname,
        "..",
        "client",
        "index.html",
      );

      let template = await fs.promises.readFile(clientTemplate, "utf-8");
      template = template.replace(
        `src="/src/main.tsx"`,
        `src="/src/main.tsx?v=${nanoid()}"`,
      );

      const articleMatch = url.match(/^\/article\/([^?#]+)/);
      if (articleMatch) {
        try {
          const slug = decodeURIComponent(articleMatch[1]);
          const article = await storage.getArticleBySlug(slug);
          if (article) {
            const articleUrl = `${canonicalBase}/article/${article.slug}`;
            const imageUrl = ogImageUrl(article.coverImage || "", canonicalBase);
            const finalImage = imageUrl || `${canonicalBase}/og-image.jpg`;

            template = stripExistingMeta(template);

            const ogTags = [
              `<meta property="og:title" content="${escapeHtml(article.title)}" />`,
              `<meta property="og:description" content="${escapeHtml(article.excerpt)}" />`,
              `<meta property="og:type" content="article" />`,
              `<meta property="og:url" content="${escapeHtml(articleUrl)}" />`,
              `<meta property="og:image" content="${escapeHtml(finalImage)}" />`,
              `<meta property="og:image:secure_url" content="${escapeHtml(finalImage)}" />`,
              `<meta property="og:image:width" content="800" />`,
              `<meta property="og:image:height" content="450" />`,
              `<meta property="og:image:type" content="image/jpeg" />`,
              `<meta property="og:site_name" content="Folx Music Television" />`,
              `<meta property="og:locale" content="de_DE" />`,
              `<meta property="fb:pages" content="1428520781492675" />`,
              `<meta name="twitter:card" content="summary_large_image" />`,
              `<meta name="twitter:title" content="${escapeHtml(article.title)}" />`,
              `<meta name="twitter:description" content="${escapeHtml(article.excerpt)}" />`,
              `<meta name="twitter:image" content="${escapeHtml(finalImage)}" />`,
              `<meta name="description" content="${escapeHtml(article.excerpt)}" />`,
              `<meta name="keywords" content="Volksmusik, Schlager, ${escapeHtml(article.title)}, ${escapeHtml(article.category || 'News')}, FOLX TV" />`,
              `<link rel="canonical" href="${escapeHtml(articleUrl)}" />`,
              `<title>${escapeHtml(article.title)} - Volksmusik & Schlager | Folx Music Television</title>`,
            ].join("\n    ");

            template = template.replace(/<title>[^<]*<\/title>/, ogTags);
          }
        } catch (e) {
        }
      }

      if (url.match(/^\/gallery(\/|$|\?)/)) {
        template = stripExistingMeta(template);
        const galTitle = "Fotogalerie \u2013 Exklusive Backstage- & Konzertfotos | FOLX TV";
        const galDesc = "Einzigartige Fotos direkt von unseren Aufzeichnungen und Sendungen: Backstage-Momente, Konzertbilder und exklusive Aufnahmen der Volksmusik- und Schlager-Stars bei FOLX TV.";
        const galUrl = `${canonicalBase}/gallery`;
        const galImage = `${canonicalBase}/images/og-image.jpg`;

        const galTags = [
          `<meta property="og:title" content="${escapeHtml(galTitle)}" />`,
          `<meta property="og:description" content="${escapeHtml(galDesc)}" />`,
          `<meta property="og:type" content="website" />`,
          `<meta property="og:url" content="${escapeHtml(galUrl)}" />`,
          `<meta property="og:image" content="${escapeHtml(galImage)}" />`,
          `<meta property="og:image:secure_url" content="${escapeHtml(galImage)}" />`,
          `<meta property="og:image:width" content="1200" />`,
          `<meta property="og:image:height" content="630" />`,
          `<meta property="og:image:type" content="image/jpeg" />`,
          `<meta property="og:site_name" content="Folx Music Television" />`,
          `<meta property="og:locale" content="de_DE" />`,
          `<meta name="twitter:card" content="summary_large_image" />`,
          `<meta name="twitter:title" content="${escapeHtml(galTitle)}" />`,
          `<meta name="twitter:description" content="${escapeHtml(galDesc)}" />`,
          `<meta name="twitter:image" content="${escapeHtml(galImage)}" />`,
          `<meta name="description" content="${escapeHtml(galDesc)}" />`,
          `<meta name="keywords" content="Fotogalerie, Volksmusik Fotos, Schlager Bilder, Konzertfotos, Backstage, FOLX TV, Volksmusik Stars" />`,
          `<link rel="canonical" href="${escapeHtml(galUrl)}" />`,
          `<title>${escapeHtml(galTitle)}</title>`,
        ].join("\n    ");

        template = template.replace(/<title>[^<]*<\/title>/, galTags);
      }

      if (url.match(/^\/horoskop(\/|$|\?)/)) {
        template = stripExistingMeta(template);
        const signMatch = url.match(/^\/horoskop\/([^?#]+)/);
        const signName = signMatch ? decodeURIComponent(signMatch[1]) : null;
        const capitalSign = signName ? signName.charAt(0).toUpperCase() + signName.slice(1) : null;

        const title = capitalSign
          ? `${capitalSign} Horoskop – Tages-, Wochen- & Monatshoroskop | Folx Music Television`
          : "Horoskop – Tages-, Wochen- & Monatshoroskop für alle Sternzeichen | Folx Music Television";
        const desc = capitalSign
          ? `${capitalSign} Horoskop: Tägliches, wöchentliches und monatliches Horoskop. Liebe, Beruf & Gesundheit bei FOLX TV.`
          : "Kostenloses Tageshoroskop, Wochenhoroskop & Monatshoroskop für alle 12 Sternzeichen. Liebe, Beruf, Gesundheit bei FOLX TV.";
        const horoUrl = `${canonicalBase}${signName ? `/horoskop/${signName}` : "/horoskop"}`;
        const horoImage = `${canonicalBase}/images/horoskop-og.jpg`;

        const horoTags = [
          `<meta property="og:title" content="${escapeHtml(title)}" />`,
          `<meta property="og:description" content="${escapeHtml(desc)}" />`,
          `<meta property="og:type" content="website" />`,
          `<meta property="og:url" content="${escapeHtml(horoUrl)}" />`,
          `<meta property="og:image" content="${escapeHtml(horoImage)}" />`,
          `<meta property="og:image:secure_url" content="${escapeHtml(horoImage)}" />`,
          `<meta property="og:image:width" content="1200" />`,
          `<meta property="og:image:height" content="675" />`,
          `<meta property="og:image:type" content="image/jpeg" />`,
          `<meta property="og:site_name" content="Folx Music Television" />`,
          `<meta property="og:locale" content="de_DE" />`,
          `<meta name="twitter:card" content="summary_large_image" />`,
          `<meta name="twitter:title" content="${escapeHtml(title)}" />`,
          `<meta name="twitter:description" content="${escapeHtml(desc)}" />`,
          `<meta name="twitter:image" content="${escapeHtml(horoImage)}" />`,
          `<meta name="description" content="${escapeHtml(desc)}" />`,
          `<meta name="keywords" content="Horoskop, Tageshoroskop, Wochenhoroskop, Monatshoroskop, Sternzeichen, Volksmusik, FOLX TV${capitalSign ? `, ${capitalSign}` : ""}" />`,
          `<link rel="canonical" href="${escapeHtml(horoUrl)}" />`,
          `<title>${escapeHtml(title)}</title>`,
        ].join("\n    ");

        template = template.replace(/<title>[^<]*<\/title>/, horoTags);
      }

      const page = await vite.transformIndexHtml(url, template);
      res.status(200).set({ "Content-Type": "text/html" }).end(page);
    } catch (e) {
      vite.ssrFixStacktrace(e as Error);
      next(e);
    }
  });
}