import express, { type Express } from "express";
import fs from "fs";
import path from "path";
import { storage } from "./storage";

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}`;
}

export function serveStatic(app: Express) {
  const distPath = path.resolve(__dirname, "public");
  if (!fs.existsSync(distPath)) {
    throw new Error(
      `Could not find the build directory: ${distPath}, make sure to build the client first`,
    );
  }

  app.use(express.static(distPath, {
    setHeaders(res, filePath) {
      if (filePath.endsWith("og-image.jpg") || filePath.includes("/uploads/")) {
        res.setHeader("Cache-Control", "public, max-age=86400");
      }
    },
  }));

  app.use("/{*path}", async (req, res) => {
    const url = req.originalUrl;
    const indexPath = path.resolve(distPath, "index.html");

    const articleMatch = url.match(/^\/article\/([^?#]+)/);
    if (articleMatch) {
      try {
        const slug = decodeURIComponent(articleMatch[1]);
        const article = await storage.getArticleBySlug(slug);
        if (article) {
          const host = req.get("host") || "folx.tv";
          const protocol = req.get("x-forwarded-proto") || "https";
          const baseUrl = `${protocol}://${host}`;
          const articleUrl = `${baseUrl}/article/${article.slug}`;
          const imageUrl = ogImageUrl(article.coverImage || "", baseUrl);

          let template = await fs.promises.readFile(indexPath, "utf-8");

          const finalImage = imageUrl || `${baseUrl}/og-image.jpg`;
          const ogTags = [
            `<meta property="og:title" content="${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="${escapeHtml(finalImage)}" />`,
            `<meta property="og:image:width" content="1200" />`,
            `<meta property="og:image:height" content="630" />`,
            `<meta property="og:site_name" content="Folx Music Television" />`,
            `<meta name="twitter:card" content="summary_large_image" />`,
            `<meta name="twitter:title" content="${escapeHtml(article.title)}" />`,
            `<meta name="twitter:description" content="${escapeHtml(article.excerpt)}" />`,
            `<meta name="twitter:image" content="${escapeHtml(finalImage)}" />`,
            `<meta name="description" content="${escapeHtml(article.excerpt)}" />`,
            `<title>${escapeHtml(article.title)} - Folx Music Television</title>`,
          ].join("\n    ");

          template = template.replace(/<meta property="og:[^>]*>\s*/g, "");
          template = template.replace(/<meta name="description"[^>]*>\s*/g, "");
          template = template.replace(/<meta name="twitter:[^>]*>\s*/g, "");
          template = template.replace(/<title>[^<]*<\/title>/, ogTags);

          res.status(200).set({ "Content-Type": "text/html" }).end(template);
          return;
        }
      } catch (e) {
      }
    }

    const host = req.get("host") || "folx.tv";
    const protocol = req.get("x-forwarded-proto") || "https";
    const baseUrl = `${protocol}://${host}`;

    let template = await fs.promises.readFile(indexPath, "utf-8");
    template = template.replace(/https:\/\/www\.folx\.tv\//g, `${baseUrl}/`);
    template = template.replace(/https:\/\/www\.folx\.tv\/og-image\.jpg/g, `${baseUrl}/og-image.jpg`);

    res.status(200).set({ "Content-Type": "text/html" }).end(template);
  });
}