const nodemailer = require('nodemailer');

/**
 * Sends an email with the PDF attachment.
 * @param {string} toEmail - The recipient's email address
 * @param {string|number} orderNumber - The Shopify order number
 * @param {Buffer} pdfBuffer - The PDF data buffer
 */
const sendEmailWithAttachment = async (toEmail, orderNumber, pdfBuffer) => {
    // Create a transporter using your email service credentials
    // You can configure SMTP, SendGrid, Amazon SES, etc.
    const transporter = nodemailer.createTransport({
        host: process.env.SMTP_HOST,
        port: Number(process.env.SMTP_PORT) || 465,
        secure: process.env.SMTP_SECURE === 'true', // true for 465, false for other ports
        auth: {
            user: process.env.SMTP_USER,
            pass: process.env.SMTP_PASS,
        },
        tls: {
            rejectUnauthorized: false
        }
    });

    const mailOptions = {
        from: `"${process.env.SHOP_NAME || 'Your Store'}" <${process.env.SMTP_FROM_EMAIL}>`,
        to: toEmail,
        subject: `Invoice for your order #${orderNumber}`,
        text: `Thank you for your order! Attached is the invoice for order #${orderNumber}.`,
        html: `<p>Thank you for your order!</p><p>Attached is the invoice for order <b>#${orderNumber}</b>.</p>`,
        attachments: [
            {
                filename: `Invoice_${orderNumber}.pdf`,
                content: pdfBuffer,
                contentType: 'application/pdf'
            }
        ]
    };

    try {
        const info = await transporter.sendMail(mailOptions);
        console.log(`Email sent: ${info.messageId}`);
        return info;
    } catch (error) {
        console.error('Error sending email:', error);
        throw error;
    }
};

module.exports = { sendEmailWithAttachment };