using CanteenContracts.BindingModels;
using CanteenContracts.BusinessLogicsContracts;
using CanteenContracts.SearchModel;
using CanteenContracts.StorageContracts;
using CanteenContracts.ViewModels;
using CanteenDataModels.Enums;
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 OrderLogic : IOrderLogic
    {
		private readonly ILogger _logger;
		private readonly IOrderStorage _orderStorage;
		public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage)
		{
			_logger = logger;
			_orderStorage = orderStorage;
		}
		public OrderViewModel? ReadElement(OrderSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. DateFrom:{DateFrom}. DateTo:{DateTo}. Id:{Id}", 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;
		}
		public List<OrderViewModel>? ReadList(OrderSearchModel? model)
		{
			_logger.LogInformation("ReadList. Id: {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 (model.OrderStatus != OrderStatus.Неизвестен && model.PaymentStatus != PaymentStatus.Неизвестно)
			{
				_logger.LogWarning("Invalid order status");
				return false;
			}
			model.OrderStatus = OrderStatus.Принят; model.PaymentStatus = PaymentStatus.Неоплачен;
			if (_orderStorage.Insert(model) == null)
			{
				model.OrderStatus = OrderStatus.Неизвестен;
				model.PaymentStatus = PaymentStatus.Неизвестно;
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			return true;
		}
		private bool StatusUpdate(OrderBindingModel model, OrderStatus newStatusO, PaymentStatus newStatusP)
		{
			var viewModel = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
			if (viewModel == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (viewModel.OrderStatus + 1 != newStatusO && viewModel.PaymentStatus + 1 != newStatusP)
			{
				_logger.LogWarning("Change status operation failed");
				throw new InvalidOperationException();
			}
			model.OrderStatus = newStatusO;
			model.PaymentStatus = newStatusP;
			if (model.OrderStatus == OrderStatus.Готов && model.PaymentStatus == PaymentStatus.Частично)
			{
				model.DateImplement = DateTime.Now;
			}
			else
			{
				model.DateImplement = viewModel.DateImplement;
			}
			if (viewModel.CookId.HasValue)
			{
				model.CookId = viewModel.CookId.Value;
			}
			CheckModel(model, false);
			if (_orderStorage.Update(model) == null)
			{
				_logger.LogWarning("Change status operation failed");
				return false;
			}
			return true;
		}
		public bool TakeOrderInWork(OrderBindingModel model)
		{
			return StatusUpdate(model, OrderStatus.Выполняется, PaymentStatus.Частично);
		}
		public bool FinishOrder(OrderBindingModel model)
		{
			model.DateImplement = DateTime.Now;
			return StatusUpdate(model, OrderStatus.Готов, PaymentStatus.Оплачен);
		}
		public bool DeliveryOrder(OrderBindingModel model)
		{

			return StatusUpdate(model, OrderStatus.Выдан, PaymentStatus.Оплачен);
		}
		private void CheckModel(OrderBindingModel model, bool withParams = true)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			if (!withParams)
			{
				return;
			}
			if (model.OrderPrice <= 0)
			{
				throw new ArgumentNullException("Стоимость заказа должна быть больше 0", nameof(model.OrderPrice));
			}
			_logger.LogInformation("Order. Id: {Id}. OrderPrice: {OrderPrice}. DishId: {DishId}", model.Id, model.OrderPrice, model.DishId);
			var element = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
			if (element != null && element.Id == model.Id)
			{
				throw new InvalidOperationException("Заказ с таким номером уже есть");
			}
		}
	}
}