using SoftwareInstallationContracts.BindingModels;
using SoftwareInstallationContracts.BusinessLogicsContracts;
using SoftwareInstallationContracts.SearchModels;
using SoftwareInstallationContracts.StoragesContracts;
using SoftwareInstallationContracts.ViewModels;
using SoftwareInstallationDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using SoftwareInstallationBusinessLogic.MailWorker;

namespace SoftwareInstallationBusinessLogic.BusinessLogic
{
	public class OrderLogic : IOrderLogic
	{
		private readonly ILogger _logger;
		private readonly IOrderStorage _orderStorage;
		private readonly AbstractMailWorker _mailWorker;
		private readonly IClientLogic _clientLogic;
		static readonly object locker = new object();

		public OrderLogic(ILogger<OrderLogic> logger, IOrderStorage orderStorage, AbstractMailWorker mailWorker, IClientLogic clientLogic)
		{
			_logger = logger;
			_orderStorage = orderStorage;
			_mailWorker = mailWorker;
			_clientLogic = clientLogic;
		}

		public OrderViewModel? ReadElement(OrderSearchModel model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}
			_logger.LogInformation("ReadElement. Id:{ Id}", 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. 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 (model.Status != OrderStatus.Неизвестен)
				return false;
			model.Status = OrderStatus.Принят;
			
			var res = _orderStorage.Insert(model);
			if (res == null)
			{
				_logger.LogWarning("Insert operation failed");
				return false;
			}
			SendOrderStatusMail(model.ClientId, $"Изменен статус заказа #{res.Id}", $"Заказ #{res.Id} изменен статус на {model.Status}");
			return true;
		}

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

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

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

		public bool ToNextStatus(OrderBindingModel model, OrderStatus orderStatus)
		{
			CheckModel(model, false);
			var element = _orderStorage.GetElement(new OrderSearchModel { Id = model.Id });
			if (element == null)
			{
				_logger.LogWarning("Read operation failed");
				return false;
			}
			if (element.Status != orderStatus - 1)
			{
				_logger.LogWarning("Status change operation failed");
				throw new InvalidOperationException("Текущий статус заказа не может быть переведен в выбранный");
			}
			model.Status = orderStatus;
			if (model.Status == OrderStatus.Готов) model.DateImplement = DateTime.Now;
			if (element.ImplementerId.HasValue)
				model.ImplementerId = element.ImplementerId;
			var result = _orderStorage.Update(model);
			if (result == null)
			{
				_logger.LogWarning("Update operation failed");
				return false;
			}
			SendOrderStatusMail(result.ClientId, $"Изменен статус заказа #{result.Id}", $"Заказ #{model.Id} изменен статус на {result.Status}");
			return true;
		}

		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 ArgumentNullException("Количество изделий должно быть больше 0", nameof(model.Count));
			}
			if (model.Sum <= 0)
			{
				throw new ArgumentNullException("Цена заказа должна быть больше 0", nameof(model.Sum));
			}
			_logger.LogInformation("Software. SoftwareId:{SoftwareId}.Count:{Count}.Sum:{Sum}Id:{Id}", model.SoftwareId, model.Count, model.Sum, model.Id);
		}
		private bool SendOrderStatusMail(int clientId, string subject, string text)
		{
			var client = _clientLogic.ReadElement(new() { Id = clientId });
			if (client == null)
			{
				return false;
			}
			_mailWorker.MailSendAsync(new()
			{
				MailAddress = client.Email,
				Subject = subject,
				Text = text
			});
			return true;
		}
	}
}