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;");
}

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;

    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 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 = article.coverImage ? (article.coverImage.startsWith("http") ? article.coverImage : `${baseUrl}${article.coverImage}`) : "";

            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="${escapeHtml(articleUrl)}" />`,
              imageUrl ? `<meta property="og:image" content="${escapeHtml(imageUrl)}" />` : "",
              `<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)}" />`,
              imageUrl ? `<meta name="twitter:image" content="${escapeHtml(imageUrl)}" />` : "",
              `<title>${escapeHtml(article.title)} - Folx Music Television</title>`,
            ].filter(Boolean).join("\n    ");

            template = template.replace(
              /<title>.*?<\/title>/,
              ogTags
            );
            template = template.replace(
              /<meta property="og:title"[^>]*\/>\s*/,
              ""
            );
            template = template.replace(
              /<meta property="og:description"[^>]*\/>\s*/,
              ""
            );
          }
        } catch (e) {
        }
      }

      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);
    }
  });
}