uWine/uWine.Core.Infrastructure/Services/UserService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using uWine.Core.Domain.Entities;
using uWine.Core.Domain.Repositories;

namespace uWine.Core.Infrastructure.Services
{
    public class UserService
    {
        public IUserRepository _userRepository;
        readonly OwnerService _ownerService;
        readonly IOwnerRepository   _ownerRepository;


        public UserService(
            IUserRepository userRepository, OwnerService ownerService, IOwnerRepository ownerRepository)
        {
            _userRepository = userRepository;
            _ownerService = ownerService;
            _ownerRepository = ownerRepository;
        }

        public User Process(int userId)
        {
            var user = _userRepository.UserById(userId);
            if (user == null)
                throw new ArgumentException($"User with ID {userId} not found.");

            var owners = _ownerRepository.FromUser(userId)
                ?.Select(owner => _ownerService.FillData(owner))
                .ToList();

            user.Owners = owners ?? new List<Owner>();
            return user;
        }
    }
}