# All files / modules/superadmin superadmin.service.ts

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     import {
      Injectable,
      NotFoundException,
      ConflictException,
      BadRequestException,
    } from '@nestjs/common';
    import { InjectRepository } from '@nestjs/typeorm';
    import { Repository, ILike, FindOptionsWhere } from 'typeorm';
    import { Tenant } from '../tenants/entities/tenant.entity';
    import { User } from '../auth/entities/user.entity';
    import { Subscription } from '../billing/entities/subscription.entity';
    import {
      CreateTenantDto,
      UpdateTenantDto,
      UpdateTenantStatusDto,
      ListTenantsQueryDto,
    } from './dto';

    export interface TenantWithStats extends Tenant {
      userCount?: number;
      subscription?: Subscription | null;
    }

    export interface PaginatedResult<T> {
      data: T[];
      total: number;
      page: number;
      limit: number;
      totalPages: number;
    }

    @Injectable()
    export class SuperadminService {
      constructor(
        @InjectRepository(Tenant)
        private readonly tenantRepository: Repository<Tenant>,
        @InjectRepository(User)
        private readonly userRepository: Repository<User>,
        @InjectRepository(Subscription)
        private readonly subscriptionRepository: Repository<Subscription>,
      ) {}

      async listTenants(query: ListTenantsQueryDto): Promise<PaginatedResult<TenantWithStats>> {
        const { page = 1, limit = 10, search, status, sortBy = 'created_at', sortOrder = 'DESC' } = query;

        const where: FindOptionsWhere<Tenant> = {};

        if (search) {
          // Search by name or slug
          where.name = ILike(`%${search}%`);
        }

        if (status) {
          where.status = status;
        }

        const [tenants, total] = await this.tenantRepository.findAndCount({
          where,
          order: { [sortBy]: sortOrder },
          skip: (page - 1) * limit,
          take: limit,
        });

        // Get user counts for each tenant
        const tenantsWithStats: TenantWithStats[] = await Promise.all(
          tenants.map(async (tenant) => {
            const userCount = await this.userRepository.count({
              where: { tenant_id: tenant.id },
            });

            const subscription = await this.subscriptionRepository.findOne({
              where: { tenant_id: tenant.id },
              relations: ['plan'],
            });

            return {
              ...tenant,
              userCount,
              subscription,
            };
          }),
        );

        return {
          data: tenantsWithStats,
          total,
          page,
          limit,
          totalPages: Math.ceil(total / limit),
        };
      }

      async getTenant(id: string): Promise<TenantWithStats> {
        const tenant = await this.tenantRepository.findOne({
          where: { id },
        });

        if (!tenant) {
          throw new NotFoundException('Tenant not found');
        }

        const userCount = await this.userRepository.count({
          where: { tenant_id: id },
        });

        const subscription = await this.subscriptionRepository.findOne({
          where: { tenant_id: id },
          relations: ['plan'],
        });

        return {
          ...tenant,
          userCount,
          subscription,
        };
      }

      async createTenant(dto: CreateTenantDto): Promise<Tenant> {
        // Check if slug is unique
        const existingTenant = await this.tenantRepository.findOne({
          where: { slug: dto.slug },
        });

        if (existingTenant) {
          throw new ConflictException('A tenant with this slug already exists');
        }

        const tenant = this.tenantRepository.create({
          name: dto.name,
          slug: dto.slug,
          domain: dto.domain,
          logo_url: dto.logo_url,
          plan_id: dto.plan_id,
          status: dto.status || 'trial',
          trial_ends_at: dto.status === 'trial' ? new Date(Date.now() + 14 * 24 * 60 * 60 * 1000) : null, // 14 days trial
        });

        return this.tenantRepository.save(tenant);
      }

      async updateTenant(id: string, dto: UpdateTenantDto): Promise<Tenant> {
        const tenant = await this.tenantRepository.findOne({
          where: { id },
        });

        if (!tenant) {
          throw new NotFoundException('Tenant not found');
        }

        Object.assign(tenant, dto);
        return this.tenantRepository.save(tenant);
      }

      async updateTenantStatus(id: string, dto: UpdateTenantStatusDto): Promise<Tenant> {
        const tenant = await this.tenantRepository.findOne({
          where: { id },
        });

        if (!tenant) {
          throw new NotFoundException('Tenant not found');
        }

        tenant.status = dto.status;

        // If status is suspended or canceled, you might want to log the reason
        if (dto.reason) {
          tenant.metadata = {
            ...tenant.metadata,
            statusChangeReason: dto.reason,
            statusChangedAt: new Date().toISOString(),
          };
        }

        return this.tenantRepository.save(tenant);
      }

      async deleteTenant(id: string): Promise<void> {
        const tenant = await this.tenantRepository.findOne({
          where: { id },
        });

        if (!tenant) {
          throw new NotFoundException('Tenant not found');
        }

        // Check if tenant has users
        const userCount = await this.userRepository.count({
          where: { tenant_id: id },
        });

        if (userCount > 0) {
          throw new BadRequestException(
            'Cannot delete tenant with active users. Please remove all users first or suspend the tenant.',
          );
        }

        await this.tenantRepository.remove(tenant);
      }

      async getTenantUsers(tenantId: string, page = 1, limit = 10): Promise<PaginatedResult<User>> {
        const tenant = await this.tenantRepository.findOne({
          where: { id: tenantId },
        });

        if (!tenant) {
          throw new NotFoundException('Tenant not found');
        }

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

        return {
          data: users,
          total,
          page,
          limit,
          totalPages: Math.ceil(total / limit),
        };
      }

      async getDashboardStats(): Promise<{
        totalTenants: number;
        activeTenants: number;
        trialTenants: number;
        suspendedTenants: number;
        totalUsers: number;
        newTenantsThisMonth: number;
      }> {
        const [
          totalTenants,
          activeTenants,
          trialTenants,
          suspendedTenants,
          totalUsers,
          newTenantsThisMonth,
        ] = await Promise.all([
          this.tenantRepository.count(),
          this.tenantRepository.count({ where: { status: 'active' } }),
          this.tenantRepository.count({ where: { status: 'trial' } }),
          this.tenantRepository.count({ where: { status: 'suspended' } }),
          this.userRepository.count(),
          this.tenantRepository
            .createQueryBuilder('tenant')
            .where('tenant.created_at >= :startOfMonth', {
              startOfMonth: new Date(new Date().getFullYear(), new Date().getMonth(), 1),
            })
            .getCount(),
        ]);

        return {
          totalTenants,
          activeTenants,
          trialTenants,
          suspendedTenants,
          totalUsers,
          newTenantsThisMonth,
        };
      }

      // ==================== Metrics ====================

      async getTenantGrowth(months = 12): Promise<{ month: string; count: number }[]> {
        const result: { month: string; count: number }[] = [];
        const now = new Date();

        for (let i = months - 1; i >= 0; i--) {
          const startDate = new Date(now.getFullYear(), now.getMonth() - i, 1);
          const endDate = new Date(now.getFullYear(), now.getMonth() - i + 1, 0, 23, 59, 59);

          const count = await this.tenantRepository
            .createQueryBuilder('tenant')
            .where('tenant.created_at >= :startDate', { startDate })
            .andWhere('tenant.created_at <= :endDate', { endDate })
            .getCount();

          result.push({
            month: startDate.toLocaleDateString('en-US', { month: 'short', year: 'numeric' }),
            count,
          });
        }

        return result;
      }

      async getUserGrowth(months = 12): Promise<{ month: string; count: number }[]> {
        const result: { month: string; count: number }[] = [];
        const now = new Date();

        for (let i = months - 1; i >= 0; i--) {
          const startDate = new Date(now.getFullYear(), now.getMonth() - i, 1);
          const endDate = new Date(now.getFullYear(), now.getMonth() - i + 1, 0, 23, 59, 59);

          const count = await this.userRepository
            .createQueryBuilder('user')
            .where('user.created_at >= :startDate', { startDate })
            .andWhere('user.created_at <= :endDate', { endDate })
            .getCount();

          result.push({
            month: startDate.toLocaleDateString('en-US', { month: 'short', year: 'numeric' }),
            count,
          });
        }

        return result;
      }

      async getPlanDistribution(): Promise<{ plan: string; count: number; percentage: number }[]> {
        const subscriptions = await this.subscriptionRepository
          .createQueryBuilder('sub')
          .leftJoinAndSelect('sub.plan', 'plan')
          .where('sub.status = :status', { status: 'active' })
          .getMany();

        const planCounts: Record<string, number> = {};
        let total = 0;

        for (const sub of subscriptions) {
          const planName = sub.plan?.display_name || sub.plan?.name || 'Unknown';
          planCounts[planName] = (planCounts[planName] || 0) + 1;
          total++;
        }

        // Add tenants without subscription as "Free"
        const tenantsWithSubscription = subscriptions.map(s => s.tenant_id);
        const freeCount = await this.tenantRepository
          .createQueryBuilder('tenant')
          .where('tenant.id NOT IN (:...ids)', {
            ids: tenantsWithSubscription.length > 0 ? tenantsWithSubscription : ['00000000-0000-0000-0000-000000000000']
          })
          .getCount();

        Iif (freeCount > 0) {
          planCounts['Free'] = freeCount;
          total += freeCount;
        }

        return Object.entries(planCounts).map(([plan, count]) => ({
          plan,
          count,
          percentage: total > 0 ? Math.round((count / total) * 100) : 0,
        }));
      }

      async getStatusDistribution(): Promise<{ status: string; count: number; percentage: number }[]> {
        const statuses = ['active', 'trial', 'suspended', 'canceled'];
        const total = await this.tenantRepository.count();

        const result = await Promise.all(
          statuses.map(async (status) => {
            const count = await this.tenantRepository.count({ where: { status } });
            return {
              status: status.charAt(0).toUpperCase() + status.slice(1),
              count,
              percentage: total > 0 ? Math.round((count / total) * 100) : 0,
            };
          }),
        );

        return result;
      }

      async getTopTenants(limit = 10): Promise<{
        id: string;
        name: string;
        slug: string;
        userCount: number;
        status: string;
        planName: string;
      }[]> {
        const tenants = await this.tenantRepository.find({
          order: { created_at: 'ASC' },
          take: 100, // Get more to sort by user count
        });

        const tenantsWithCounts = await Promise.all(
          tenants.map(async (tenant) => {
            const userCount = await this.userRepository.count({
              where: { tenant_id: tenant.id },
            });

            const subscription = await this.subscriptionRepository.findOne({
              where: { tenant_id: tenant.id },
              relations: ['plan'],
            });

            return {
              id: tenant.id,
              name: tenant.name,
              slug: tenant.slug,
              userCount,
              status: tenant.status,
              planName: subscription?.plan?.display_name || 'Free',
            };
          }),
        );

        // Sort by user count descending and take top N
        return tenantsWithCounts
          .sort((a, b) => b.userCount - a.userCount)
          .slice(0, limit);
      }

      async getMetricsSummary(): Promise<{
        tenantGrowth: { month: string; count: number }[];
        userGrowth: { month: string; count: number }[];
        planDistribution: { plan: string; count: number; percentage: number }[];
        statusDistribution: { status: string; count: number; percentage: number }[];
        topTenants: { id: string; name: string; slug: string; userCount: number; status: string; planName: string }[];
      }> {
        const [tenantGrowth, userGrowth, planDistribution, statusDistribution, topTenants] =
          await Promise.all([
            this.getTenantGrowth(12),
            this.getUserGrowth(12),
            this.getPlanDistribution(),
            this.getStatusDistribution(),
            this.getTopTenants(10),
          ]);

        return {
          tenantGrowth,
          userGrowth,
          planDistribution,
          statusDistribution,
          topTenants,
        };
      }
    }