import { Injectable, Inject } from '@nestjs/common';
import * as bcrypt from 'bcryptjs';
import { IPaginator } from '@devstroupe/devkit-core';
import { IUserRepository } from '../domain/user.repository';
import { User } from '../domain/user';

@Injectable()
export class UserService {
  constructor(
    @Inject('IUserRepository')
    private readonly userRepo: IUserRepository,
  ) {}

  async create(user: Omit<User, 'id'>): Promise<User> {
    const existing = await this.userRepo.findByEmail(user.email);
    if (existing) {
      throw new Error('Email already registered');
    }

    const hashedPassword = await bcrypt.hash(user.password, 10);
    return this.userRepo.create({
      ...user,
      password: hashedPassword,
    });
  }

  async findById(id: number): Promise<User | null> {
    return this.userRepo.findById(id);
  }

  async findOne(id: number): Promise<User | null> {
    return this.findById(id);
  }

  async findByEmail(email: string): Promise<User | null> {
    return this.userRepo.findByEmail(email);
  }

  async update(id: number, user: Partial<User>): Promise<User> {
    if (user.password) {
      user.password = await bcrypt.hash(user.password, 10);
    }
    return this.userRepo.update(id, user);
  }

  async findAll(): Promise<User[]> {
    return this.userRepo.findAll();
  }

  async findMany(filter: any): Promise<IPaginator<User>> {
    return this.userRepo.findMany(filter);
  }

  async delete(id: number): Promise<void> {
    await this.userRepo.delete(id);
  }
}