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utils/emailService.js

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+let nodemailer = null
+try {
+  nodemailer = require('nodemailer')
+} catch (error) {
+  console.warn('[emailService] nodemailer not installed:', error.message)
+}
+
+let transporter = null
+
+function getTransporter () {
+  if (!nodemailer) return null
+  if (transporter) return transporter
+
+  const host = process.env.SMTP_HOST
+  const port = Number(process.env.SMTP_PORT || 587)
+  const user = process.env.SMTP_USER
+  const pass = process.env.SMTP_PASS
+
+  if (!host || !user || !pass) {
+    return null
+  }
+
+  transporter = nodemailer.createTransport({
+    host,
+    port,
+    secure: port === 465,
+    auth: { user, pass }
+  })
+
+  return transporter
+}
+
+function isEmailConfigured () {
+  return Boolean(nodemailer && getTransporter())
+}
+
+async function sendEmail ({ to, subject, text, html }) {
+  const mailer = getTransporter()
+  if (!mailer) {
+    console.warn('[emailService] SMTP is not configured. Email not sent to:', to)
+    return false
+  }
+
+  await mailer.sendMail({
+    from: process.env.SMTP_FROM || process.env.SMTP_USER,
+    to,
+    subject,
+    text,
+    html
+  })
+
+  return true
+}
+
+async function sendOtpEmail (to, otp, purpose = 'verification') {
+  const subjectMap = {
+    verification: 'کد تایید مدستاگرام',
+    password_reset: 'بازیابی کلمه عبور مدستاگرام'
+  }
+
+  const subject = subjectMap[purpose] || subjectMap.verification
+  const text = `کد تایید شما: ${otp}\n\nاین کد تا ۲ دقیقه معتبر است.\nمدستاگرام`
+  const html = `
+    <div dir="rtl" style="font-family:Tahoma,sans-serif;line-height:1.8">
+      <h2>${subject}</h2>
+      <p>کد تایید شما:</p>
+      <p style="font-size:24px;font-weight:bold;letter-spacing:4px">${otp}</p>
+      <p>این کد تا ۲ دقیقه معتبر است.</p>
+      <p>مدستاگرام</p>
+    </div>
+  `
+
+  return sendEmail({ to, subject, text, html })
+}
+
+module.exports = {
+  isEmailConfigured,
+  sendEmail,
+  sendOtpEmail
+}