added html admin notification mail

internal/services/email_service.go

@@ -102,7 +102,42 @@ func (s *EmailService) SendWelcomeEmail(user *models.User, membership *models.Me
 }
 
 func (s *EmailService) NotifyAdminOfNewUser(user *models.User) error {
-	subject := "New User Registration"
-	body := "<p>A new user has registered with the email: " + user.Email + "</p>"
-	return s.SendEmail(s.adminEmail, subject, body)
+	// Prepare data to be injected into the template
+	data := struct {
+		FirstName       string
+		LastName        string
+		MembershipModel string
+		MembershipID    int64
+		MembershipFee   float32
+		RentalFee       float32
+		Address         string
+		ZipCode         string
+		City            string
+		DateOfBirth     string
+		Email           string
+		Phone           string
+		IBAN            string
+	}{
+		FirstName:       user.FirstName,
+		LastName:        user.LastName,
+		MembershipModel: user.Membership.SubscriptionModel.Name,
+		MembershipID:    user.Membership.ID,
+		MembershipFee:   float32(user.Membership.SubscriptionModel.MonthlyFee),
+		RentalFee:       float32(user.Membership.SubscriptionModel.HourlyRate),
+		Address:         user.Address,
+		ZipCode:         user.ZipCode,
+		City:            user.City,
+		DateOfBirth:     user.DateOfBirth.Format("20060102"),
+		Email:           user.Email,
+		Phone:           *user.Phone,
+		IBAN:            user.BankAccount.IBAN,
+	}
+
+	subject := "Neues Mitglied hat sich registriert"
+	body, err := ParseTemplate("mail_registration.html", data)
+	if err != nil {
+		logger.Error.Print("Couldn't send admin notification mail")
+		return err
+	}
+	return s.SendEmail(user.Email, subject, body)
 }