add OTP email sending functionality and integrate with user authentication flow

libs/common/src/config/email.config.ts

@@ -19,5 +19,7 @@ export default registerAs(
       process.env.MAILTRAP_DELETE_USER_TEMPLATE_UUID,
     MAILTRAP_EDIT_USER_TEMPLATE_UUID:
       process.env.MAILTRAP_EDIT_USER_TEMPLATE_UUID,
+    MAILTRAP_SEND_OTP_TEMPLATE_UUID:
+      process.env.MAILTRAP_SEND_OTP_TEMPLATE_UUID,
   }),
 );

libs/common/src/util/email.service.ts

@@ -181,6 +181,49 @@ export class EmailService {
       );
     }
   }
+  async sendOtpEmailWithTemplate(
+    email: string,
+    emailEditData: any,
+  ): Promise<void> {
+    const isProduction = process.env.NODE_ENV === 'production';
+    const API_TOKEN = this.configService.get<string>(
+      'email-config.MAILTRAP_API_TOKEN',
+    );
+    const API_URL = isProduction
+      ? SEND_EMAIL_API_URL_PROD
+      : SEND_EMAIL_API_URL_DEV;
+    const TEMPLATE_UUID = this.configService.get<string>(
+      'email-config.MAILTRAP_SEND_OTP_TEMPLATE_UUID',
+    );
+
+    const emailData = {
+      from: {
+        email: this.smtpConfig.sender,
+      },
+      to: [
+        {
+          email: email,
+        },
+      ],
+      template_uuid: TEMPLATE_UUID,
+      template_variables: emailEditData,
+    };
+
+    try {
+      await axios.post(API_URL, emailData, {
+        headers: {
+          Authorization: `Bearer ${API_TOKEN}`,
+          'Content-Type': 'application/json',
+        },
+      });
+    } catch (error) {
+      throw new HttpException(
+        error.response?.data?.message ||
+          'Error sending email using Mailtrap template',
+        error.response?.status || HttpStatus.INTERNAL_SERVER_ERROR,
+      );
+    }
+  }
   generateUserChangesEmailBody(
     addedSpaceNames: string[],
     removedSpaceNames: string[],

src/auth/services/user-auth.service.ts

@@ -181,25 +181,25 @@ export class UserAuthService {
     otpCode: string;
     cooldown: number;
   }> {
+    try {
       const otpLimiter = new Date();
       otpLimiter.setDate(
         otpLimiter.getDate() - this.configService.get<number>('OTP_LIMITER'),
       );
-    const userExists = await this.userRepository.exists({
+      const user = await this.userRepository.findOne({
         where: {
-        region: data.regionUuid
-          ? {
-              uuid: data.regionUuid,
-            }
-          : undefined,
+          region: data.regionUuid ? { uuid: data.regionUuid } : undefined,
           email: data.email,
           isUserVerified: data.type === OtpType.PASSWORD ? true : undefined,
         },
       });
-    if (!userExists) {
+      if (!user) {
         throw new BadRequestException('User not found');
       }
-    await this.otpRepository.softDelete({ email: data.email, type: data.type });
+      await this.otpRepository.softDelete({
+        email: data.email,
+        type: data.type,
+      });
       await this.otpRepository.delete({
         email: data.email,
         type: data.type,
@@ -250,10 +250,29 @@ export class UserAuthService {
         },
       });
       cooldown = 30 * Math.pow(2, countOfOtpToReturn - 1);
-    const subject = 'OTP send successfully';
-    const message = `Your OTP code is ${otpCode}`;
-    this.emailService.sendEmail(data.email, subject, message);
+
+      const [otp1, otp2, otp3, otp4, otp5, otp6] = otpCode.split('');
+
+      await this.emailService.sendOtpEmailWithTemplate(data.email, {
+        name: user.firstName,
+        otp1,
+        otp2,
+        otp3,
+        otp4,
+        otp5,
+        otp6,
+      });
+
       return { otpCode, cooldown };
+    } catch (error) {
+      if (error instanceof BadRequestException) {
+        throw error;
+      }
+      console.error('OTP generation error:', error);
+      throw new BadRequestException(
+        'An unexpected error occurred while generating the OTP.',
+      );
+    }
   }
 
   async verifyOTP(