const express = require("express");
const nodemailer = require("nodemailer");
const fs = require("fs");
const multer = require("multer");
const router = express.Router();

// Setup multer for handling file uploads
const storage = multer.diskStorage({
  destination: function (req, file, cb) {
    cb(null, "./"); // Save to the current directory (you can customize this)
  },
  filename: function (req, file, cb) {
    cb(null, file.originalname); // Use the original file name
  },
});

const upload = multer({ storage });

// Route to handle email sending with file attachment
router.post("/", upload.single("file"), async (req, res) => {
  const { teacher, fileName, recipientEmail } = req.body;

  if (!teacher || !fileName || !recipientEmail || !req.file) {
    return res.status(400).json({ error: "Missing required fields or file" });
  }

  // Configure Nodemailer transporter
  const transporter = nodemailer.createTransport({
    service: "gmail",
    auth: {
      user: "swdc.ate@gmail.com", // Replace with your email
      pass: "umlc hbkr dpga iywd", // Replace with your app-specific password or token
    },
    connectionTimeout: 15000,
    greetingTimeout: 15000,  
    socketTimeout: 15000,    
  });

  // Email options
  const mailOptions = {
    from: "swdc.ate@gmail.com", // Replace with your email
    to: recipientEmail,
    subject: `Excel File for ${teacher}`,
    text: `Attached is the Excel file for ${teacher}.`,
    attachments: [
      {
        filename: fileName,
        path: req.file.path, // Use the uploaded file's path
      },
    ],
  };

  try {
    // Send email
    await transporter.sendMail(mailOptions);

    // Delete the temporary file after sending the email
    fs.unlinkSync(req.file.path);

    res.status(200).json({ message: "Email sent successfully" });
  } catch (error) {
    console.error("Error sending email:", error);
    res.status(500).json({ error: "Failed to send email" });
  }
});

module.exports = router;