using ConfectioneryContracts.BindingModels;
using ConfectioneryContracts.BusinessLogicsContracts;
using ConfectioneryContracts.SearchModels;
using ConfectioneryContracts.StoragesContracts;
using ConfectioneryContracts.ViewModels;
using ConfectioneryDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConfectioneryBusinessLogic
{
	public class OrderLogic : IOrderLogic
	{
		private readonly ILogger _logger;
		private readonly IOrderStorage _orderStorage;
		static readonly object _locker = new object();
		public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage)
		{
			_logger = logger;
			_orderStorage = orderStorage;
		}
		public List<OrderViewModel>? ReadList(OrderSearchModel? model)
		{
			_logger.LogInformation("ReadList. ClientId:{ClientId}.Status:{Status}.ImplementerId:{ImplementerId}.DateFrom:{DateFrom}.DateTo:{DateTo}OrderId:{Id}",
				model?.ClientId, model?.Status, model?.ImplementerId, model?.DateFrom, model?.DateTo, 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 (model.Status != OrderStatus.Неизвестен)
				return false;
			model.Status = OrderStatus.Принят;
			if (_orderStorage.Insert(model) == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}

		public bool TakeOrderInWork(OrderBindingModel model)
		{
			lock (_locker)
			{
				return ChangeStatus(model, OrderStatus.Выполняется);
			}
		}

		public bool FinishOrder(OrderBindingModel model)
		{
			return ChangeStatus(model, OrderStatus.Готов);
		}

		public bool DeliveryOrder(OrderBindingModel model)
		{
			return ChangeStatus(model, OrderStatus.Выдан);
		}

		private void CheckModel(OrderBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (model.Count <= 0)
			{
				throw new ArgumentException("Колличество суши в заказе не может быть меньше 1", nameof(model.Count));
			}
			if (model.Sum <= 0)
			{
				throw new ArgumentException("Стоимость заказа на может быть меньше 1", nameof(model.Sum));
			}
			if (model.DateImplement.HasValue && model.DateImplement < model.DateCreate)
			{
				throw new ArithmeticException($"Дата выдачи заказа {model.DateImplement} не может быть раньше даты его создания {model.DateCreate}");
			}
			_logger.LogInformation("Sushi. SushiId:{SushiId}.Count:{Count}.Sum:{Sum}Id:{Id}",
				model.PastryId, model.Count, model.Sum, model.Id);
		}

		private bool ChangeStatus(OrderBindingModel model, OrderStatus requiredStatus)
		{
			CheckModel(model, false);
			var element = _orderStorage.GetElement(new OrderSearchModel()
			{
				Id = model.Id
			});
			if (element == null)
			{
				throw new InvalidOperationException(nameof(element));
			}
			model.DateCreate = element.DateCreate;
			model.PastryId = element.PastryId;
			model.DateImplement = element.DateImplement;
			model.ClientId = element.ClientId;
			if (!model.ImplementerId.HasValue)
			{
				model.ImplementerId = element.ImplementerId;
			}
			model.Status = element.Status;
			model.Count = element.Count;
			model.Sum = element.Sum;
			if (requiredStatus - model.Status == 1)
			{
				model.Status = requiredStatus;
				if (model.Status == OrderStatus.Готов)
				{
					model.DateImplement = DateTime.Now;
				}
				if (_orderStorage.Update(model) == null)
				{
					_logger.LogWarning("Update operation failed");
					return false;
				}
				return true;
			}
			_logger.LogWarning("Changing status operation faled: Current-{Status}:required-{requiredStatus}.", model.Status, requiredStatus);
			throw new InvalidOperationException($"Невозможно приствоить статус {requiredStatus} заказу с текущим статусом {model.Status}");

		}

		public OrderViewModel? ReadElement(OrderSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. ClientId:{ClientId}.Status:{Status}.ImplementerId:{ImplementerId}.DateFrom:{DateFrom}.DateTo:{DateTo}OrderId:{Id}",
				model.ClientId, model.Status, model.ImplementerId, model.DateFrom, model.DateTo, model.Id);
			var element = _orderStorage.GetElement(model);
			if (element == null)
			{
				_logger.LogWarning("ReadElement element not found");
				return null;
			}
			_logger.LogInformation("ReadElement find. Id:{Id}", element.Id);
			return element;
		}
	}
}