using CanteenContracts.BindingModels;
using CanteenContracts.BusinessLogicsContracts;
using CanteenContracts.SearchModel;
using CanteenContracts.StorageContracts;
using CanteenContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CanteenBusinessLogic.BusinessLogics
{
    public class DishLogic : IDishLogic
    {
		private readonly ILogger _logger;
		private readonly IDishStorage _dishStorage;
		public DishLogic(ILogger<DishLogic> logger, IDishStorage dishStorage)
		{
			_logger = logger;
			_dishStorage = dishStorage;
		}
		public List<DishViewModel>? ReadList(DishSearchModel? model)
		{
			_logger.LogInformation("ReadList. DishName:{DishName}.Id:{ Id}", model?.DishName, model?.Id);
			var list = model == null ? _dishStorage.GetFullList() : _dishStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
			return list;
		}
		public DishViewModel? ReadElement(DishSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. DishName:{DishName}.Id:{ Id}", model.DishName, model.Id);
			var element = _dishStorage.GetElement(model);
			if (element == null)
			{
				_logger.LogWarning("ReadElement element not found");
				return null;
			}
			_logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
			return element;
		}
		public bool Create(DishBindingModel model)
		{
			CheckModel(model);
			if (_dishStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}
		public bool Update(DishBindingModel model)
		{
			CheckModel(model);
			if (_dishStorage.Update(model) == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			return true;
		}
		public bool Delete(DishBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);
			if (_dishStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete operation failed");
				return false;
			}
			return true;
		}
		private void CheckModel(DishBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (string.IsNullOrEmpty(model.DishName))
			{
				throw new ArgumentNullException("Нет названия блюда", nameof(model.DishName));
			}
			if (model.DishPrice <= 0)
			{
				throw new ArgumentNullException("Цена блюда должна быть больше 0", nameof(model.DishPrice));
			}
			_logger.LogInformation("Dish. DishName:{DishName}.DishPrice:{DishPrice}.Id: { Id}", model.DishName, model.DishPrice, model.Id);
			var element = _dishStorage.GetElement(new DishSearchModel
			{
				DishName = model.DishName
			});
			if (element != null && element.Id != model.Id)
			{
				throw new InvalidOperationException("Блюдо с таким названием уже есть");
			}
		}
	}
}