import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Repository } from 'typeorm';
import { User, UserRole } from './entities/user.entity';

@Injectable()
export class UsersService {
  constructor(
    @InjectRepository(User)
    private readonly userRepository: Repository<User>,
  ) {}

  async findByPhone(tenantId: string, phone: string): Promise<User | null> {
    return this.userRepository.findOne({ where: { tenant_id: tenantId, phone } });
  }

  async findById(tenantId: string, id: string): Promise<User | null> {
    return this.userRepository.findOne({ where: { tenant_id: tenantId, id } });
  }

  async create(tenantId: string, phone: string, role: string = 'rider'): Promise<User> {
    const user = this.userRepository.create({ tenant_id: tenantId, phone, role: role as UserRole });
    return this.userRepository.save(user);
  }

  async findOrCreate(tenantId: string, phone: string, role: string = 'rider'): Promise<User> {
    const existing = await this.findByPhone(tenantId, phone);
    return existing ?? this.create(tenantId, phone, role);
  }

  async listByTenant(tenantId: string): Promise<User[]> {
    return this.userRepository.find({ where: { tenant_id: tenantId } });
  }

  async updateProfile(
    tenantId: string,
    id: string,
    data: Partial<Pick<User, 'name' | 'language'>>,
  ): Promise<User | null> {
    const patch: Partial<User> = {};
    if (data.name !== undefined) patch.name = data.name;
    if (data.language !== undefined) patch.language = data.language;
    if (Object.keys(patch).length > 0) {
      await this.userRepository.update({ tenant_id: tenantId, id }, patch);
    }
    return this.findById(tenantId, id);
  }

  /** لغة الإشعارات للمستخدم — استعلام خفيف (عمود واحد) يُستدعى قبل كل push. */
  async getLanguage(tenantId: string, id: string): Promise<string | null> {
    const row = await this.userRepository.findOne({
      where: { tenant_id: tenantId, id },
      select: { language: true },
    });
    return row?.language ?? null;
  }

  async setRole(tenantId: string, id: string, role: string): Promise<void> {
    await this.userRepository.update(
      { tenant_id: tenantId, id },
      { role: role as UserRole },
    );
  }
}