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import nodemailer from 'nodemailer';

// Create transporter with fallback to console logging if SMTP is not available
const createTransporter = () => {
  if (!process.env.SMTP_HOST || !process.env.SMTP_USER || !process.env.SMTP_PASSWORD) {
    console.warn('[EMAIL] SMTP configuration missing, emails will be logged to console only');
    return null;
  }

  try {
    return nodemailer.createTransport({
      host: process.env.SMTP_HOST,
      port: parseInt(process.env.SMTP_PORT || '587'),
      secure: process.env.SMTP_SECURE === 'true',
      auth: {
        user: process.env.SMTP_USER,
        pass: process.env.SMTP_PASSWORD,
      },
      // Add timeout to prevent hanging
      connectionTimeout: 10000,
      greetingTimeout: 10000,
      socketTimeout: 10000,
    });
  } catch (error) {
    console.error('[EMAIL] Failed to create SMTP transporter:', error);
    return null;
  }
};

const transporter = createTransporter();

interface EmailOptions {
  to: string;
  subject: string;
  text: string;
  html: string;
}

export async function sendEmail({ to, subject, text, html }: EmailOptions) {
  try {
    // Check if transporter is available
    if (!transporter) {
      console.log(`[EMAIL] SMTP not configured, logging email to console:`);
      console.log(`[EMAIL] To: ${to}`);
      console.log(`[EMAIL] Subject: ${subject}`);
      console.log(`[EMAIL] Text: ${text}`);
      console.log(`[EMAIL] HTML: ${html}`);
      return { messageId: 'console-logged' };
    }

    const info = await transporter.sendMail({
      from: process.env.SMTP_FROM,
      to,
      subject,
      text,
      html,
    });

    console.log('Email sent:', info.messageId);
    return info;
  } catch (error) {
    console.error('Error sending email:', error);
    console.log(`[EMAIL] Failed to send email to ${to}, subject: ${subject}`);
    console.log(`[EMAIL] Email content would have been: ${text}`);
    
    // In development, don't throw errors for email failures
    if (process.env.NODE_ENV === 'development') {
      console.log('[EMAIL] In development mode, continuing without email');
      return { messageId: 'failed-but-continued' };
    }
    
    throw error;
  }
}

export async function sendConfirmationEmail(email: string, firstName: string, isFrench: boolean = false) {
  const subject = isFrench
    ? 'Confirmation de votre inscription à l\'action collective'
    : 'Confirmation of your class action registration';

  const text = isFrench
    ? `Cher ${firstName},\n\nNous avons bien reçu votre inscription à l'action collective. Nous vous contacterons bientôt pour la suite du processus.\n\nCordialement,\nL'équipe de l'action collective`
    : `Dear ${firstName},\n\nWe have received your registration for the class action. We will contact you soon to proceed with the next steps.\n\nBest regards,\nThe Class Action Team`;

  const html = isFrench
    ? `
      <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
        <h2 style="color: #2563eb;">Confirmation de votre inscription</h2>
        <p>Cher ${firstName},</p>
        <p>Nous avons bien reçu votre inscription à l'action collective. Nous vous contacterons bientôt pour la suite du processus.</p>
        <p>Cordialement,<br>L'équipe de l'action collective</p>
      </div>
    `
    : `
      <div style="font-family: Arial, sans-serif; max-width: 600px; margin: 0 auto;">
        <h2 style="color: #2563eb;">Registration Confirmation</h2>
        <p>Dear ${firstName},</p>
        <p>We have received your registration for the class action. We will contact you soon to proceed with the next steps.</p>
        <p>Best regards,<br>The Class Action Team</p>
      </div>
    `;

  return sendEmail({ to: email, subject, text, html });
}

export async function sendPasswordResetEmail(email: string, token: string, lang: 'en' | 'fr' = 'en') {
  const baseUrl = process.env.NODE_ENV === 'production' 
    ? 'https://action-collective.info'
    : 'https://localhost';
  const resetUrl = `${baseUrl}/auth/reset-password?token=${token}`;
  const subject = lang === 'fr'
    ? 'Réinitialisation de votre mot de passe'
    : 'Reset your password';
  const text = lang === 'fr'
    ? `Pour réinitialiser votre mot de passe, cliquez sur ce lien : ${resetUrl}\nCe lien expirera dans une heure.`
    : `To reset your password, click this link: ${resetUrl}\nThis link will expire in one hour.`;
  const html = lang === 'fr'
    ? `<p>Pour réinitialiser votre mot de passe, cliquez sur ce lien :</p><p><a href="${resetUrl}">${resetUrl}</a></p><p>Ce lien expirera dans une heure.</p>`
    : `<p>To reset your password, click this link:</p><p><a href="${resetUrl}">${resetUrl}</a></p><p>This link will expire in one hour.</p>`;
  return sendEmail({ to: email, subject, text, html });
}