import { Injectable } from '@nestjs/common';
import { PrismaService } from '../prisma/prisma.service';

@Injectable()
export class AdminUsersService {
  constructor(private readonly prisma: PrismaService) {}

  async findAll(search?: string) {
    return this.prisma.user.findMany({
      where: search
        ? {
            OR: [
              { email: { contains: search, mode: 'insensitive' } },
              { name: { contains: search, mode: 'insensitive' } },
            ],
          }
        : undefined,
      select: {
        id: true,
        email: true,
        name: true,
        role: true,
        emailVerified: true,
        createdAt: true,
        lastLoginAt: true,
        suspendedAt: true,
        _count: {
          select: {
            wallets: true,
            transactions: true,
          },
        },
      },
      orderBy: { createdAt: 'desc' },
    });
  }

  async findOne(id: string) {
    return this.prisma.user.findUnique({
      where: { id },
      include: {
        subscriptions: {
          include: {
            plan: true,
          },
        },
        _count: {
          select: {
            wallets: true,
            transactions: true,
            payments: true,
          },
        },
      },
    });
  }

  async updateRole(id: string, role: string) {
    return this.prisma.user.update({
      where: { id },
      data: { role },
    });
  }

  async suspend(id: string, reason: string) {
    return this.prisma.user.update({
      where: { id },
      data: {
        suspendedAt: new Date(),
        suspendedReason: reason,
      },
    });
  }

  async unsuspend(id: string) {
    return this.prisma.user.update({
      where: { id },
      data: {
        suspendedAt: null,
        suspendedReason: null,
      },
    });
  }

  async grantProAccess(userId: string, planSlug: string, durationDays: number) {
    const plan = await this.prisma.plan.findUnique({
      where: { slug: planSlug },
    });

    if (!plan) {
      throw new Error('Plan not found');
    }

    const now = new Date();
    const endDate = new Date(now);
    endDate.setDate(endDate.getDate() + durationDays);

    // Check if user already has a subscription
    const existing = await this.prisma.subscription.findUnique({
      where: { userId },
    });

    if (existing) {
      // Update existing subscription
      return this.prisma.subscription.update({
        where: { userId },
        data: {
          planId: plan.id,
          status: 'active',
          startDate: now,
          endDate,
        },
      });
    } else {
      // Create new subscription
      return this.prisma.subscription.create({
        data: {
          userId,
          planId: plan.id,
          status: 'active',
          startDate: now,
          endDate,
        },
      });
    }
  }

  async getStats() {
    const totalUsers = await this.prisma.user.count();
    const activeSubscriptions = await this.prisma.subscription.count({
      where: { status: 'active' },
    });
    const suspendedUsers = await this.prisma.user.count({
      where: { suspendedAt: { not: null } },
    });

    return {
      totalUsers,
      activeSubscriptions,
      suspendedUsers,
    };
  }
}