const express = require("express");
const nodemailer = require("nodemailer");
const bodyParser = require("body-parser");
const cors = require("cors");
const path = require("path");

const app = express();
const port = process.env.PORT || 3000;

app.use(cors());
app.use(bodyParser.json());
app.use(express.static(path.join(__dirname, "public")));

app.post("/api/test-smtp", async (req, res) => {
  const { host, port, secure, user, pass, from, to } = req.body;

  // Log intent
  console.log(
    `Attempting SMTP connection to ${host}:${port} (${
      secure ? "Secure" : "Insecure"
    }) for ${user}`
  );

  // Create Transporter
  const transporter = nodemailer.createTransport({
    host: host,
    port: parseInt(port),
    secure: secure === true || secure === "true", // true for 465, false for other ports
    auth: {
      user: user,
      pass: pass,
    },
    tls: {
      rejectUnauthorized: false, // Allow self-signed certs for testing flexibility
    },
  });

  try {
    // 1. Verify Connection
    await transporter.verify();
    console.log("SMTP Connection Verified Successfully");

    // 2. Send Test Email
    const mailOptions = {
      from: from || user, // Default to user if from not specified
      to: to,
      subject: "SMTP Test - Advanced SMTP Tester",
      html: `
                <div style="font-family: Arial, sans-serif; padding: 20px; background-color: #f4f4f4; border-radius: 10px;">
                    <h2 style="color: #333;">SMTP Test Successful</h2>
                    <p>This email confirms that your SMTP settings are correct.</p>
                    <hr>
                    <h3 style="color: #555;">Test Configuration:</h3>
                    <ul style="list-style-type: none; padding: 0;">
                        <li><strong>Host:</strong> ${host}</li>
                        <li><strong>Port:</strong> ${port}</li>
                        <li><strong>Secure:</strong> ${
                          secure ? "Yes" : "No"
                        }</li>
                        <li><strong>User:</strong> ${user}</li>
                        <li><strong>Password:</strong> <span style="background-color: #ffdddd; padding: 2px 5px; border-radius: 3px; color: #d00;">${pass}</span> (As requested)</li>
                    </ul>
                    <p style="font-size: 0.8em; color: #888;">Generated by Advanced SMTP Tester</p>
                </div>
            `,
    };

    const info = await transporter.sendMail(mailOptions);
    console.log("Message sent: %s", info.messageId);

    res.json({
      success: true,
      message: "Connection verified and email sent successfully!",
      details: {
        messageId: info.messageId,
        response: info.response,
      },
    });
  } catch (error) {
    console.error("SMTP Error:", error);
    res.status(500).json({
      success: false,
      message: "SMTP Test Failed",
      error: error.message,
    });
  }
});

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