import { Injectable } from '@nestjs/common';
import { UserStatus, UserRole, Prisma } from '@prisma/client';
import { PrismaService } from '../prisma/prisma.service';

type UserWithProfiles = Prisma.UserGetPayload<{
  include: { userProfile: true; agentProfile: true };
}>;

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

  async findAll(page = 1, limit = 10, role?: UserRole) {
    const skip = (page - 1) * limit;

    // Build where clause for optional role filter
    const where: Prisma.UserWhereInput = role ? { role } : {};

    const [users, total] = await Promise.all([
      this.prisma.user.findMany({
        where,
        skip,
        take: limit,
        orderBy: { createdAt: 'desc' },
        include: {
          userProfile: true,
          agentProfile: true,
        },
      }) as Promise<UserWithProfiles[]>,
      this.prisma.user.count({ where }),
    ]);

    return {
      users: users.map((user) => {
        // Get the appropriate profile based on role
        const profile = user.role === UserRole.AGENT ? user.agentProfile : user.userProfile;

        return {
          id: user.id,
          email: user.email,
          role: user.role,
          status: user.status,
          emailVerified: user.emailVerified,
          authProvider: user.authProvider,
          createdAt: user.createdAt,
          lastLoginAt: user.lastLoginAt,
          profile: profile
            ? {
                firstName: profile.firstName,
                lastName: profile.lastName,
                avatar: profile.avatar,
                phone: profile.phone,
                city: profile.city,
                state: profile.state,
                country: profile.country,
              }
            : null,
        };
      }),
      total,
      page,
      limit,
      totalPages: Math.ceil(total / limit),
    };
  }

  async findOne(id: string) {
    const user = (await this.prisma.user.findUnique({
      where: { id },
      include: {
        userProfile: true,
        agentProfile: true,
      },
    })) as UserWithProfiles | null;

    if (!user) {
      return null;
    }

    // Get the appropriate profile based on role
    const profile = user.role === UserRole.AGENT ? user.agentProfile : user.userProfile;

    return {
      id: user.id,
      email: user.email,
      role: user.role,
      status: user.status,
      emailVerified: user.emailVerified,
      authProvider: user.authProvider,
      createdAt: user.createdAt,
      lastLoginAt: user.lastLoginAt,
      profile: profile
        ? {
            firstName: profile.firstName,
            lastName: profile.lastName,
            avatar: profile.avatar,
            phone: profile.phone,
            city: profile.city,
            state: profile.state,
            country: profile.country,
          }
        : null,
    };
  }

  async updateStatus(id: string, status: UserStatus) {
    return this.prisma.user.update({
      where: { id },
      data: { status },
    });
  }
}