server.js

const express = require("express");
const app = express();
const puppeteer = require("puppeteer");
const path = require("path");
const fs = require("fs");
const port = 3000;

app.use(express.json());

app.get("/health", (req, res) => {
  res.status(200).json({ status: "ok" });
});

/**
 * Default font family for PDF generation
 * You can customize this to use different fonts or styles
 * Make sure to include the font files in your project and load them in the HTML template
 */

const fontFilePath = path.join(__dirname, "fonts", "Atma-Bold.ttf");
const fontBase64 = fs.readFileSync(fontFilePath).toString("base64");

/**
 * Endpoint to generate PDF from HTML template
 * Expects JSON body with "name" and "message" fields
 * Example request body:
 * {
 *   "name": "মাহমুদ হাসান রামীম",
 *   "message": "আসসালামু আলাইকুম, এই একটি উদাহরণ পিডিএফ যা বাংলা ফন্ট ব্যবহার করে তৈরি করা হয়েছে।"
 * }
 */
app.post("/generate-html-to-pdf", async (req, res) => {
  try {
    const { name, message } = req.body;
    const timeStamp = Date.now(); // Unique timestamp for file naming
    console.log("Font path:", fontFilePath); // Log the font path to verify it's correct

    // Load HTML template
    let html = fs.readFileSync(
      path.join(__dirname, "templates", "invoice.html"),
      "utf8",
    );

    // Replace dynamic values
    html = html
      .replace("{{name}}", name)
      .replace("{{message}}", message)
      .replace(
        "{{FONT_PATH}}",
        `data:font/truetype;charset=utf-8;base64,${fontBase64}`,
      ); // Embed the font as a base64 data URI

    const browser = await puppeteer.launch({
      headless: "new",
      args: [
        "--no-sandbox",
        "--disable-setuid-sandbox",
        "--allow-file-access-from-files",
      ],
    });

    const page = await browser.newPage();

    await page.setContent(html, {
      waitUntil: "networkidle0",
    });
    await page.evaluateHandle("document.fonts.ready");

    const pdfBuffer = await page.pdf({
      format: "A4",
      printBackground: true,
    });

    await browser.close();

    // Save the PDF to the server folder (Output folder)

    fs.writeFileSync(
      path.join(__dirname, "outputs", `${timeStamp}.pdf`),
      pdfBuffer,
    );

    // res.send({
    //   success: true,
    //   message: "PDF generated successfully",
    // });

    res.set({
      "Content-Type": "application/pdf",
      "Content-Disposition": `attachment; filename=${timeStamp}.pdf`,
    });

    res.send(pdfBuffer);
  } catch (error) {
    console.error(error);
    res.status(500).send("PDF generation failed");
  }
});

app.listen(port, () => {
  console.log(`Server is running on http://localhost:${port}`);
});