# Code coverage report for modules/notifications/services/notifications.service.ts

# All files / modules/notifications/services notifications.service.ts

90.72% Statements 88/97
68.18% Branches 30/44
100% Functions 14/14
95.45% Lines 84/88

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     import { Injectable, NotFoundException, Logger } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository, LessThan } from 'typeorm';
    import {
      Notification,
      NotificationTemplate,
      UserNotificationPreference,
    } from '../entities';
    import {
      CreateNotificationDto,
      SendTemplateNotificationDto,
      UpdatePreferencesDto,
    } from '../dto';
    import { EmailService } from '@modules/email';

    @Injectable()
    export class NotificationsService {
      private readonly logger = new Logger(NotificationsService.name);

      constructor(
        @InjectRepository(Notification)
        private readonly notificationRepository: Repository<Notification>,
        @InjectRepository(NotificationTemplate)
        private readonly templateRepository: Repository<NotificationTemplate>,
        @InjectRepository(UserNotificationPreference)
        private readonly preferenceRepository: Repository<UserNotificationPreference>,
        private readonly emailService: EmailService,
      ) {}

      // ==================== Notifications ====================

      async create(
        dto: CreateNotificationDto,
        tenantId: string,
      ): Promise<Notification> {
        const notification = this.notificationRepository.create({
          user_id: dto.userId,
          tenant_id: tenantId,
          type: dto.type || 'info',
          channel: dto.channel || 'in_app',
          title: dto.title,
          message: dto.message,
          data: dto.data || null,
          action_url: dto.actionUrl || null,
          delivery_status: 'pending',
        });

        const saved = await this.notificationRepository.save(notification);

        // If in_app, mark as delivered immediately
        if (saved.channel === 'in_app') {
          saved.delivery_status = 'delivered';
          saved.sent_at = new Date();
          await this.notificationRepository.save(saved);
        }

        // For email, send via EmailService
        if (saved.channel === 'email' && dto.email) {
          try {
            const result = await this.emailService.sendEmail({
              to: { email: dto.email, name: dto.userName },
              subject: saved.title,
              html: this.formatEmailHtml(saved.title, saved.message, saved.action_url),
              text: saved.message,
              metadata: { notificationId: saved.id },
            });

            if (result.success) {
              saved.delivery_status = 'delivered';
              saved.sent_at = new Date();
              this.logger.log(`Email sent to ${dto.email}: ${result.messageId}`);
            } else {
              saved.delivery_status = 'failed';
              this.logger.error(`Failed to send email to ${dto.email}: ${result.error}`);
            }
            await this.notificationRepository.save(saved);
          } catch (error) {
            this.logger.error(`Email delivery error: ${error.message}`);
            saved.delivery_status = 'failed';
            await this.notificationRepository.save(saved);
          }
        }

        // TODO: For push/sms, implement respective services

        return saved;
      }

      async sendFromTemplate(
        dto: SendTemplateNotificationDto,
        tenantId: string,
      ): Promise<Notification> {
        const template = await this.templateRepository.findOne({
          where: { code: dto.templateCode, is_active: true },
        });

        if (!template) {
          throw new NotFoundException(`Template '${dto.templateCode}' no encontrado`);
        }

        // Replace variables in template
        let message = template.body;
        let subject = template.subject || '';

        if (dto.variables) {
          for (const [key, value] of Object.entries(dto.variables)) {
            const regex = new RegExp(`{{${key}}}`, 'g');
            message = message.replace(regex, String(value));
            subject = subject.replace(regex, String(value));
          }
        }

        return this.create(
          {
            userId: dto.userId,
            channel: template.channel as any,
            title: subject || template.name,
            message,
            data: { templateCode: dto.templateCode, variables: dto.variables },
          },
          tenantId,
        );
      }

      async findAllForUser(
        userId: string,
        tenantId: string,
        options: { page?: number; limit?: number; unreadOnly?: boolean } = {},
      ): Promise<{ data: Notification[]; total: number; unread: number }> {
        const { page = 1, limit = 20, unreadOnly = false } = options;

        const whereCondition: any = {
          user_id: userId,
          tenant_id: tenantId,
          channel: 'in_app', // Only in-app notifications for listing
        };

        if (unreadOnly) {
          whereCondition.is_read = false;
        }

        const [data, total] = await this.notificationRepository.findAndCount({
          where: whereCondition,
          order: { created_at: 'DESC' },
          skip: (page - 1) * limit,
          take: limit,
        });

        const unread = await this.notificationRepository.count({
          where: {
            user_id: userId,
            tenant_id: tenantId,
            channel: 'in_app',
            is_read: false,
          },
        });

        return { data, total, unread };
      }

      async markAsRead(
        notificationId: string,
        userId: string,
        tenantId: string,
      ): Promise<Notification> {
        const notification = await this.notificationRepository.findOne({
          where: { id: notificationId, user_id: userId, tenant_id: tenantId },
        });

        if (!notification) {
          throw new NotFoundException('Notificación no encontrada');
        }

        notification.is_read = true;
        notification.read_at = new Date();

        return this.notificationRepository.save(notification);
      }

      async markAllAsRead(userId: string, tenantId: string): Promise<number> {
        const result = await this.notificationRepository.update(
          {
            user_id: userId,
            tenant_id: tenantId,
            is_read: false,
          },
          {
            is_read: true,
            read_at: new Date(),
          },
        );

        return result.affected || 0;
      }

      async delete(
        notificationId: string,
        userId: string,
        tenantId: string,
      ): Promise<void> {
        const result = await this.notificationRepository.delete({
          id: notificationId,
          user_id: userId,
          tenant_id: tenantId,
        });

        if (result.affected === 0) {
          throw new NotFoundException('Notificación no encontrada');
        }
      }

      async getUnreadCount(userId: string, tenantId: string): Promise<number> {
        return this.notificationRepository.count({
          where: {
            user_id: userId,
            tenant_id: tenantId,
            channel: 'in_app',
            is_read: false,
          },
        });
      }

      // ==================== Templates ====================

      async findAllTemplates(): Promise<NotificationTemplate[]> {
        return this.templateRepository.find({
          where: { is_active: true },
          order: { category: 'ASC', code: 'ASC' },
        });
      }

      async findTemplateByCode(code: string): Promise<NotificationTemplate> {
        const template = await this.templateRepository.findOne({
          where: { code, is_active: true },
        });

        if (!template) {
          throw new NotFoundException(`Template '${code}' no encontrado`);
        }

        return template;
      }

      // ==================== Preferences ====================

      async getPreferences(
        userId: string,
        tenantId: string,
      ): Promise<UserNotificationPreference> {
        let preferences = await this.preferenceRepository.findOne({
          where: { user_id: userId, tenant_id: tenantId },
        });

        // Create default preferences if not exist
        if (!preferences) {
          preferences = this.preferenceRepository.create({
            user_id: userId,
            tenant_id: tenantId,
            email_enabled: true,
            push_enabled: true,
            in_app_enabled: true,
            sms_enabled: false,
            marketing_emails: true,
            product_updates: true,
            security_alerts: true,
          });
          await this.preferenceRepository.save(preferences);
        }

        return preferences;
      }

      async updatePreferences(
        userId: string,
        tenantId: string,
        dto: UpdatePreferencesDto,
      ): Promise<UserNotificationPreference> {
        let preferences = await this.getPreferences(userId, tenantId);

        if (dto.emailEnabled !== undefined) preferences.email_enabled = dto.emailEnabled;
        if (dto.pushEnabled !== undefined) preferences.push_enabled = dto.pushEnabled;
        Iif (dto.inAppEnabled !== undefined) preferences.in_app_enabled = dto.inAppEnabled;
        Iif (dto.smsEnabled !== undefined) preferences.sms_enabled = dto.smsEnabled;
        Iif (dto.marketingEmails !== undefined) preferences.marketing_emails = dto.marketingEmails;
        Iif (dto.productUpdates !== undefined) preferences.product_updates = dto.productUpdates;
        Iif (dto.securityAlerts !== undefined) preferences.security_alerts = dto.securityAlerts;
        Iif (dto.categoryPreferences !== undefined) {
          preferences.category_preferences = dto.categoryPreferences;
        }

        return this.preferenceRepository.save(preferences);
      }

      // ==================== Email Formatting ====================

      private formatEmailHtml(
        title: string,
        message: string,
        actionUrl?: string | null,
      ): string {
        const actionButton = actionUrl
          ? `<p style="margin-top: 20px;">
               <a href="${actionUrl}"
                  style="display: inline-block; padding: 12px 24px; background-color: #3b82f6; color: white; text-decoration: none; border-radius: 6px; font-weight: 500;">
                 Ver más
               </a>
             </p>`
          : '';

        return `
          <!DOCTYPE html>
          <html>
            <head>
              <meta charset="utf-8">
              <meta name="viewport" content="width=device-width, initial-scale=1.0">
            </head>
            <body style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif; line-height: 1.6; color: #374151; padding: 20px; max-width: 600px; margin: 0 auto;">
              <div style="background-color: #f9fafb; border-radius: 8px; padding: 24px;">
                <h2 style="color: #111827; margin-top: 0;">${title}</h2>
                <p style="color: #4b5563; margin-bottom: 16px;">${message}</p>
                ${actionButton}
              </div>
              <p style="color: #9ca3af; font-size: 12px; margin-top: 24px; text-align: center;">
                Este es un mensaje automático de Template SaaS
              </p>
            </body>
          </html>
        `;
      }

      // ==================== Cleanup ====================

      async cleanupOldNotifications(daysToKeep: number = 30): Promise<number> {
        const cutoffDate = new Date();
        cutoffDate.setDate(cutoffDate.getDate() - daysToKeep);

        const result = await this.notificationRepository.delete({
          created_at: LessThan(cutoffDate),
          is_read: true,
        });

        return result.affected || 0;
      }
    }