# All files / modules/users/services invitation.service.ts

98.8% Statements 83/84
80% Branches 20/25
100% Functions 12/12
98.76% Lines 80/81

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     import {
      Injectable,
      Logger,
      NotFoundException,
      ConflictException,
      BadRequestException,
    } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository, In } from 'typeorm';
    import { ConfigService } from '@nestjs/config';
    import * as crypto from 'crypto';
    import { Invitation, InvitationStatus } from '../entities/invitation.entity';
    import { User } from '../../auth/entities/user.entity';
    import { Tenant } from '../../tenants/entities/tenant.entity';
    import { EmailService } from '../../email/services/email.service';
    import { InviteUserDto, InvitationResponseDto } from '../dto/invite-user.dto';

    @Injectable()
    export class InvitationService {
      private readonly logger = new Logger(InvitationService.name);
      private readonly invitationExpirationDays = 7;

      constructor(
        @InjectRepository(Invitation)
        private readonly invitationRepository: Repository<Invitation>,
        @InjectRepository(User)
        private readonly userRepository: Repository<User>,
        @InjectRepository(Tenant)
        private readonly tenantRepository: Repository<Tenant>,
        private readonly emailService: EmailService,
        private readonly configService: ConfigService,
      ) {}

      /**
       * Send an invitation to join the tenant
       */
      async invite(
        dto: InviteUserDto,
        inviterId: string,
        tenantId: string,
      ): Promise<InvitationResponseDto> {
        const email = dto.email.toLowerCase().trim();

        // Check if user already exists in this tenant
        const existingUser = await this.userRepository.findOne({
          where: { email, tenant_id: tenantId },
        });

        if (existingUser) {
          throw new ConflictException('Este email ya está registrado en la organización');
        }

        // Check if there's already a pending invitation for this email
        const existingInvitation = await this.invitationRepository.findOne({
          where: {
            email,
            tenant_id: tenantId,
            status: 'pending' as InvitationStatus,
          },
        });

        if (existingInvitation) {
          throw new ConflictException('Ya existe una invitación pendiente para este email');
        }

        // Get inviter and tenant info for the email
        const [inviter, tenant] = await Promise.all([
          this.userRepository.findOne({ where: { id: inviterId } }),
          this.tenantRepository.findOne({ where: { id: tenantId } }),
        ]);

        if (!inviter) {
          throw new NotFoundException('Usuario invitador no encontrado');
        }

        if (!tenant) {
          throw new NotFoundException('Organización no encontrada');
        }

        // Generate secure token
        const token = this.generateSecureToken();

        // Calculate expiration date
        const expiresAt = new Date();
        expiresAt.setDate(expiresAt.getDate() + this.invitationExpirationDays);

        // Create invitation record
        const invitation = this.invitationRepository.create({
          tenant_id: tenantId,
          email,
          token,
          status: 'pending' as InvitationStatus,
          expires_at: expiresAt,
          created_by: inviterId,
          message: dto.message || null,
          metadata: { role: dto.role },
        });

        await this.invitationRepository.save(invitation);

        // Send invitation email
        await this.sendInvitationEmail(invitation, inviter, tenant, dto.role);

        this.logger.log(`Invitation sent to ${email} for tenant ${tenant.name}`);

        return this.toResponseDto(invitation, dto.role);
      }

      /**
       * List all invitations for a tenant
       */
      async findAllByTenant(tenantId: string): Promise<InvitationResponseDto[]> {
        // First, update any expired invitations
        await this.expireOldInvitations(tenantId);

        const invitations = await this.invitationRepository.find({
          where: { tenant_id: tenantId },
          order: { created_at: 'DESC' },
        });

        return invitations.map((inv) => this.toResponseDto(inv, inv.metadata?.role || 'member'));
      }

      /**
       * Resend an invitation email
       */
      async resend(token: string, inviterId: string, tenantId: string): Promise<InvitationResponseDto> {
        const invitation = await this.invitationRepository.findOne({
          where: { token, tenant_id: tenantId },
        });

        if (!invitation) {
          throw new NotFoundException('Invitación no encontrada');
        }

        if (invitation.status !== 'pending') {
          throw new BadRequestException('Solo se pueden reenviar invitaciones pendientes');
        }

        // Get inviter and tenant info
        const [inviter, tenant] = await Promise.all([
          this.userRepository.findOne({ where: { id: inviterId } }),
          this.tenantRepository.findOne({ where: { id: tenantId } }),
        ]);

        Iif (!inviter || !tenant) {
          throw new NotFoundException('Usuario o organización no encontrada');
        }

        // Generate new token
        const newToken = this.generateSecureToken();

        // Reset expiration
        const expiresAt = new Date();
        expiresAt.setDate(expiresAt.getDate() + this.invitationExpirationDays);

        // Update invitation
        invitation.token = newToken;
        invitation.expires_at = expiresAt;

        await this.invitationRepository.save(invitation);

        // Resend email
        const role = invitation.metadata?.role || 'member';
        await this.sendInvitationEmail(invitation, inviter, tenant, role);

        this.logger.log(`Invitation resent to ${invitation.email}`);

        return this.toResponseDto(invitation, role);
      }

      /**
       * Cancel a pending invitation
       */
      async cancel(id: string, tenantId: string): Promise<void> {
        const invitation = await this.invitationRepository.findOne({
          where: { id, tenant_id: tenantId },
        });

        if (!invitation) {
          throw new NotFoundException('Invitación no encontrada');
        }

        if (invitation.status !== 'pending') {
          throw new BadRequestException('Solo se pueden cancelar invitaciones pendientes');
        }

        // Hard delete the invitation
        await this.invitationRepository.remove(invitation);

        this.logger.log(`Invitation ${id} cancelled for ${invitation.email}`);
      }

      /**
       * Find invitation by token (for accepting invitations)
       */
      async findByToken(token: string): Promise<Invitation | null> {
        const invitation = await this.invitationRepository.findOne({
          where: { token },
        });

        if (!invitation) {
          return null;
        }

        // Check if expired
        if (invitation.expires_at < new Date() && invitation.status === 'pending') {
          invitation.status = 'expired';
          await this.invitationRepository.save(invitation);
        }

        return invitation;
      }

      /**
       * Generate a cryptographically secure token
       */
      private generateSecureToken(): string {
        return crypto.randomBytes(32).toString('hex');
      }

      /**
       * Send invitation email
       */
      private async sendInvitationEmail(
        invitation: Invitation,
        inviter: User,
        tenant: Tenant,
        role: string,
      ): Promise<void> {
        const appUrl = this.configService.get<string>('APP_URL', 'http://localhost:3000');
        const inviteUrl = `${appUrl}/invite/${invitation.token}`;

        const expiresIn = `${this.invitationExpirationDays} días`;

        await this.emailService.sendTemplateEmail({
          to: { email: invitation.email },
          templateKey: 'invitation',
          variables: {
            inviterName: inviter.fullName || inviter.email,
            tenantName: tenant.name,
            role: this.translateRole(role),
            inviteLink: inviteUrl,
            expiresIn,
            appName: this.configService.get<string>('APP_NAME', 'Template SaaS'),
          },
        });
      }

      /**
       * Update expired invitations status
       */
      private async expireOldInvitations(tenantId: string): Promise<void> {
        await this.invitationRepository
          .createQueryBuilder()
          .update(Invitation)
          .set({ status: 'expired' as InvitationStatus })
          .where('tenant_id = :tenantId', { tenantId })
          .andWhere('status = :status', { status: 'pending' })
          .andWhere('expires_at < NOW()')
          .execute();
      }

      /**
       * Translate role for display
       */
      private translateRole(role: string): string {
        const translations: Record<string, string> = {
          admin: 'Administrador',
          member: 'Miembro',
          viewer: 'Visor',
        };
        return translations[role] || role;
      }

      /**
       * Convert invitation to response DTO
       */
      private toResponseDto(invitation: Invitation, role: string): InvitationResponseDto {
        return {
          id: invitation.id,
          email: invitation.email,
          role,
          status: invitation.status,
          expires_at: invitation.expires_at,
          created_at: invitation.created_at,
        };
      }
    }