using ElectronicsShopContracts.BindingModels;
using ElectronicsShopContracts.BusinessLogicContracts;
using ElectronicsShopContracts.SearchModels;
using ElectronicsShopContracts.StorageContracts;
using ElectronicsShopContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ElectronicsShopBusinessLogic.BusinessLogic
{
    internal class ClientLogic : IClientLogic
    {
        private readonly ILogger _logger;
        private readonly IClientStorage _storage;

        public ClientLogic(ILogger<ClientLogic> logger, IClientStorage storage)
        {
            _logger = logger;
            _storage = storage;
        }

        public bool Create(ClientBindingModel model)
        {
            CheckModel(model);
            if (_storage.Insert(model) == null)
            {
                _logger.LogWarning("Add operation failed");
                return false;
            }
            return true;
        }

        public bool Update(ClientBindingModel model)
        {
            CheckModel(model);
            if (_storage.Update(model) == null)
            {
                _logger.LogWarning("Update operation failed");
                return false;
            }
            return true;
        }

        public bool Delete(ClientBindingModel model)
        {
            CheckModel(model, false);
            _logger.LogInformation($"Delete.ID:{model.ID}");
            if (_storage.Delete(model) == null)
            {
                _logger.LogWarning("Delete operation failed");
                return false;
            }
            return true;

        }

        public ClientViewModel? ReadElemet(ClientSearchModel? model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            _logger.LogInformation($"ReadElement.Email:{model.Email}.ID:{model.ID}");
            var element  = _storage.GetElement(model); 
            if (element == null)
            {
                _logger.LogWarning("ReadElement. element not fount");
                return null;
            }
            _logger.LogInformation($"ReadElement.find.ID:{element.ID}");
            return element;
        }

        public List<ClientViewModel>? ReadList(ClientSearchModel? model)
        {

            _logger.LogInformation($"ReadList. ClientID:{model?.ID}");
            var list = model  == null ? _storage.GetFullList() : _storage.GetFilteredList(model); ;
            if (list == null)
            {
                _logger.LogWarning("ReadList. return null list");
                return null;
            }
            _logger.LogInformation($"ReadList.Count:{list.Count}");
            return list;
        }

        private void CheckModel(ClientBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
            if (string.IsNullOrEmpty(model.Email))
            {
                throw new ArgumentNullException("Нет почты пользователя", nameof(model.Email));
            }
            if (string.IsNullOrEmpty(model.ClientFIO))
            {
                throw new ArgumentNullException("Нет имени пользователя", nameof(model.ClientFIO));
            }
            if (string.IsNullOrEmpty(model.Password))
            {
                throw new ArgumentNullException("Нет пароля пользователя", nameof(model.Password));
            }
            _logger.LogInformation($"Client. ID:{model.ID}.ClientFIO:{model.ClientFIO}.Password:{model.Password}.Email:{model.Email}.");
            
            var element = _storage.GetElement(new ClientSearchModel
			{
				Email= model.Email
			});
			if (element != null && element.Email != model.Email)
			{
				throw new InvalidOperationException("Клиент с такой почтой уже есть");
			}    
        }
	}
}