import nodemailer from 'nodemailer';

let transporter;

export function initMailer() {
  const host = process.env.SMTP_HOST;
  const port = parseInt(process.env.SMTP_PORT || '587', 10);
  const user = process.env.SMTP_USER;
  const pass = process.env.SMTP_PASS;

  if (!host || !user || !pass) {
    console.warn('⚠️  SMTP not configured – email verification disabled');
    return false;
  }

  transporter = nodemailer.createTransport({
    host,
    port,
    secure: port === 465,
    auth: { user, pass },
  });

  console.log('✅ SMTP mailer configured');
  return true;
}

export function isMailerConfigured() {
  return !!transporter;
}

/**
 * Send the verification email with a clickable link.
 * @param {string} to      – recipient email
 * @param {string} name    – user's display name
 * @param {string} verifyUrl – full verification URL
 * @param {string} appName  – branding app name (default "Redlight")
 */
export async function sendVerificationEmail(to, name, verifyUrl, appName = 'Redlight') {
  if (!transporter) {
    throw new Error('SMTP not configured');
  }

  const from = process.env.SMTP_FROM || process.env.SMTP_USER;

  await transporter.sendMail({
    from: `"${appName}" <${from}>`,
    to,
    subject: `${appName} – E-Mail bestätigen / Verify your email`,
    html: `
      <div style="font-family:Arial,sans-serif;max-width:520px;margin:0 auto;padding:32px;background:#1e1e2e;color:#cdd6f4;border-radius:12px;">
        <h2 style="color:#cba6f7;margin-top:0;">Hey ${name} 👋</h2>
        <p>Bitte bestätige deine E-Mail-Adresse, indem du auf den folgenden Button klickst:</p>
        <p style="text-align:center;margin:28px 0;">
          <a href="${verifyUrl}"
             style="display:inline-block;background:#cba6f7;color:#1e1e2e;padding:12px 32px;border-radius:8px;text-decoration:none;font-weight:bold;">
            E-Mail bestätigen
          </a>
        </p>
        <p style="font-size:13px;color:#7f849c;">
          Oder kopiere diesen Link in deinen Browser:<br/>
          <a href="${verifyUrl}" style="color:#89b4fa;word-break:break-all;">${verifyUrl}</a>
        </p>
        <p style="font-size:13px;color:#7f849c;">Der Link ist 24 Stunden gültig.</p>
        <hr style="border:none;border-top:1px solid #313244;margin:24px 0;"/>
        <p style="font-size:12px;color:#585b70;">Falls du dich nicht registriert hast, ignoriere diese E-Mail.</p>
      </div>
    `,
    text: `Hey ${name},\n\nBitte bestätige deine E-Mail: ${verifyUrl}\n\nDer Link ist 24 Stunden gültig.\n\n– ${appName}`,
  });
}