import nodemailer from 'nodemailer';

// Email configuration
const smtpHost = process.env.SMTP_HOST || '';
const smtpPort = process.env.SMTP_PORT ? parseInt(process.env.SMTP_PORT, 10) : 587;
const smtpUser = process.env.SMTP_USER || '';
const smtpPass = process.env.SMTP_PASS || '';
const fromEmail = process.env.FROM_EMAIL || 'noreply@nexaflow.com';
const adminEmail = process.env.ADMIN_EMAIL || 'admin@nexaflow.com';

const isConfigured = Boolean(smtpHost && smtpUser && smtpPass);

// Create reusable transporter object using the default SMTP transport
const transporter = nodemailer.createTransport({
    host: smtpHost,
    port: smtpPort,
    secure: smtpPort === 465, // true for 465, false for other ports
    auth: {
        user: smtpUser, // generated ethereal user
        pass: smtpPass, // generated ethereal password
    },
});

interface InquiryData {
    referenceNumber: string;
    name: string;
    email: string;
    projectType: string;
    budget?: string;
    timeline?: string;
    description: string;
    company?: string;
    phone?: string;
}

export const sendQuoteConfirmation = async (inquiry: InquiryData) => {
    const targetEmail = inquiry.email;
    const subject = `Quote Request Received - Ref: ${inquiry.referenceNumber}`;

    const htmlBody = `
        <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
            <h2>Hello ${inquiry.name},</h2>
            <p>Thank you for requesting a quote from NexaFlow! We have received your inquiry.</p>
            <p><strong>Your Reference Number:</strong> ${inquiry.referenceNumber}</p>
            <hr />
            <p><strong>Project Details Summarized:</strong></p>
            <ul>
                <li><strong>Type:</strong> ${inquiry.projectType}</li>
                <li><strong>Budget:</strong> ${inquiry.budget || 'Not specified'}</li>
                <li><strong>Timeline:</strong> ${inquiry.timeline || 'Not specified'}</li>
            </ul>
            <p>Our team will review your requirements and get back to you within 24 hours with a detailed proposal or further questions.</p>
            <p>Best regards,<br/>The NexaFlow Team</p>
        </div>
    `;

    return sendEmail(targetEmail, subject, htmlBody);
};

export const sendAdminNotification = async (inquiry: InquiryData) => {
    const subject = `New Quote Request - ${inquiry.projectType.toUpperCase()} - Ref: ${inquiry.referenceNumber}`;

    const htmlBody = `
        <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
            <h2>New Quote Request Received</h2>
            <p>A new inquiry has been submitted via the website form.</p>
            <hr />
            <p><strong>Reference Number:</strong> ${inquiry.referenceNumber}</p>
            <p><strong>Client Details:</strong></p>
            <ul>
                <li><strong>Name:</strong> ${inquiry.name}</li>
                <li><strong>Email:</strong> ${inquiry.email}</li>
                <li><strong>Phone:</strong> ${inquiry.phone || 'Not provided'}</li>
                <li><strong>Company:</strong> ${inquiry.company || 'Not provided'}</li>
            </ul>
            <p><strong>Project Details:</strong></p>
            <ul>
                <li><strong>Type:</strong> ${inquiry.projectType}</li>
                <li><strong>Budget:</strong> ${inquiry.budget || 'Not specified'}</li>
                <li><strong>Timeline:</strong> ${inquiry.timeline || 'Not specified'}</li>
            </ul>
            <p><strong>Description:</strong></p>
            <p>${inquiry.description}</p>
        </div>
    `;

    return sendEmail(adminEmail, subject, htmlBody);
};

const sendEmail = async (to: string, subject: string, html: string) => {
    if (!isConfigured) {
        // Fallback for local development or when SMTP is not configured
        console.log('-------------------------------------------------------');
        console.log('📧 EMAIL MOCK (SMTP not configured)');
        console.log(`To: ${to}`);
        console.log(`From: ${fromEmail}`);
        console.log(`Subject: ${subject}`);
        console.log('Body HTML preview:');
        console.log(html);
        console.log('-------------------------------------------------------');
        return true;
    }

    try {
        const info = await transporter.sendMail({
            from: `"NexaFlow" <${fromEmail}>`, // sender address
            to, // list of receivers
            subject, // Subject line
            html, // html body
        });
        console.log("Message sent: %s", info.messageId);
        return true;
    } catch (error) {
        console.error("Error sending email:", error);
        return false;
    }
};