using ComputersShopContracts.BindingModels;
using ComputersShopContracts.BusinessLogicContracts;
using ComputersShopContracts.SearchModels;
using ComputersShopContracts.StoragesContracts;
using ComputersShopContracts.ViewModels;
using ComputersShopDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ComputersShopBusinessLogic
{
	public class OrderLogic : IOrderLogic
	{
		private readonly ILogger _logger;
		private readonly IOrderStorage _orderStorage;

		public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage)
		{
			_logger = logger;
			_orderStorage = orderStorage;
		}

		public List<OrderViewModel>? ReadList(OrderSearchModel? model)
		{
			_logger.LogInformation("ReadList. OrderId:{ Id}", model?.Id);
			var list = model == null ? _orderStorage.GetFullList() : _orderStorage.GetFilteredList(model);
			if (list == null)
			{
				_logger.LogWarning("ReadList return null list");
				return null;
			}
			_logger.LogInformation("ReadList. Count:{Count}", list.Count);
			return list;
		}

		public bool CreateOrder(OrderBindingModel model)
		{
			CheckModel(model);
			if(!CheckStatus(model, OrderStatus.Принят, false)) return false;
			if (_orderStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}

		public bool TakeOrderInWork(OrderBindingModel model)
		{
			CheckModel(model);
			if (!CheckStatus(model, OrderStatus.Выполняется)) return false;
			return true;
		}

		public bool DeliveryOrder(OrderBindingModel model)
		{
			CheckModel(model);
			if (!CheckStatus(model, OrderStatus.Готов)) return false;
			return true;
		}

		public bool FinishOrder(OrderBindingModel model)
		{
			CheckModel(model);
			if (!CheckStatus(model, OrderStatus.Выдан)) return false;
			return true;
		}

		private void CheckModel(OrderBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (model.ComputerId < 0)
			{
				throw new ArgumentNullException("Некорректный идентификатор компьютера", nameof(model.ComputerId));
			}
			if (model.Count <= 0)
			{
				throw new ArgumentNullException("Количество компьютеров в заказе должно быть больше 0", nameof(model.Count));
			}
			if (model.Sum <= 0)
			{
				throw new ArgumentNullException("Сумма заказа должна быть больше 0", nameof(model.Sum));
			}
			_logger.LogInformation("Order. OrderId:{Id}.Sum:{ Sum}. ComputerId: { ComputerId}", model.Id, model.Sum, model.ComputerId);
		}

		private bool CheckStatus(OrderBindingModel model, OrderStatus newstatus, bool update = true)
		{
			if (model.Status != newstatus - 1)
			{
				_logger.LogWarning("Failed to change status");
				return false;
			}
			model.Status = newstatus;
			if(!update) return true;
			if (_orderStorage.Update(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			if (model.Status == OrderStatus.Выдан) model.DateImplement = DateTime.Now;
			return true;
		}
	}
}