using BlogContracts.BindingModel;
using BlogContracts.BusinessLogicContracts;
using BlogContracts.SearchModels;
using BlogContracts.StorageContracts;
using BlogContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BusinessLogic
{
    public class UserLogic : IUserLogic
    {
        private readonly IUserStorage _userStorage;
        public UserLogic(IUserStorage UserStorage)
        {
            _userStorage = UserStorage ?? throw new ArgumentNullException(nameof(UserStorage));
        }

        public bool Create(UserBindingModel model)
        {
            CheckModel(model);
            if (_userStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Delete(UserBindingModel model)
        {
            CheckModel(model);
            if (_userStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        public UserViewModel? ReadElement(UserSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _userStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<UserViewModel>? ReadList(UserSearchModel? model)
        {
            var list = model == null ? _userStorage.GetFullList() : _userStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public bool Update(UserBindingModel model)
        {
            CheckModel(model);
            if (_userStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }
        private void CheckModel(UserBindingModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (string.IsNullOrEmpty(model.Name))
            {
                throw new ArgumentException("Отсутвует имя",
                    nameof(model.Name));
            }
            if (string.IsNullOrEmpty(model.DateCreate))
            {
                throw new ArgumentException("Отсутвует дата создания аккаунта",
                    nameof(model.DateCreate));
            }
            if (_userStorage.GetElement(new UserSearchModel
            {
                Name = model.Name,
            }) != null)
            {
                throw new InvalidOperationException("Такой пользователь уже существует");
            }
        }
    }
}