using IceCreamShopContracts.BindingModels;
using IceCreamShopContracts.BusinessLogicsContracts;
using IceCreamShopContracts.SearchModels;
using IceCreamShopContracts.ViewModels;
using IceCreamShopDataModels.Enums;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IceCreamShopBusinessLogic.BusinessLogic
{
	public class WorkModeling : IWorkProcess
	{
		private readonly ILogger _logger;
		private readonly Random _rnd;
		private IOrderLogic? _orderLogic;
		public WorkModeling(ILogger<WorkModeling> logger)
		{
			_logger = logger;
			_rnd = new Random(1000);
		}
		public void DoWork(IImplementerLogic implementerLogic, IOrderLogic
	   orderLogic)
		{
			_orderLogic = orderLogic;
			var implementers = implementerLogic.ReadList(null);
			if (implementers == null)
			{
				_logger.LogWarning("DoWork. Implementers is null");
				return;
			}
			var orders = _orderLogic.ReadList(new OrderSearchModel
			{
				Status =
		   OrderStatus.Принят
			});
			if (orders == null || orders.Count == 0)
			{
				_logger.LogWarning("DoWork. Orders is null or empty");
				return;
			}
			_logger.LogDebug("DoWork for {Count} orders", orders.Count);
			foreach (var implementer in implementers)
			{
				Task.Run(() => WorkerWorkAsync(implementer, orders));
			}
		}
		/// Иммитация работы исполнителя
		private async Task WorkerWorkAsync(ImplementerViewModel implementer,
	   List<OrderViewModel> orders)
		{
			if (_orderLogic == null || implementer == null)
			{
				return;
			}
			await RunWaitingOrder(implementer);
			await RunOrderInWork(implementer);
			await Task.Run(() =>
			{
				foreach (var order in orders)
				{
					try
					{
						_logger.LogDebug("DoWork. Worker {Id} try get order { Order}", implementer.Id, order.Id);
						// пытаемся назначить заказ на исполнителя
						_orderLogic.TakeOrderInWork(new OrderBindingModel
						{
							Id = order.Id,
							ImplementerId = implementer.Id
						});
						// делаем работу
						Thread.Sleep(implementer.WorkExperience * _rnd.Next(100,
						1000) * order.Count);
						_logger.LogDebug("DoWork. Worker {Id} finish order { Order}", implementer.Id, order.Id);

						_orderLogic.FinishOrder(new OrderBindingModel
						{
							Id = order.Id
						});
						// отдыхаем
						Thread.Sleep(implementer.Qualification * _rnd.Next(10, 100));
					}
					// кто-то мог уже перехватить заказ, игнорируем ошибку
					catch (InvalidOperationException ex)
					{
						_logger.LogWarning(ex, "Error try get work");
					}
					// заканчиваем выполнение имитации в случае иной ошибки
					catch (Exception ex)
					{
						_logger.LogError(ex, "Error while do work");
						throw;
					}
				}
			});
		}
		/// Ищем заказ, которые уже в работе (вдруг исполнителя прервали)
		private async Task RunOrderInWork(ImplementerViewModel implementer)
		{
			if (_orderLogic == null || implementer == null)
			{
				return;
			}
			try
			{
				var runOrder = await Task.Run(() => _orderLogic.ReadElement(new
			   OrderSearchModel
				{
					ImplementerId = implementer.Id,
					Status = OrderStatus.Выполняется
				}));
				if (runOrder == null)
				{
					return;
				}
				_logger.LogDebug("DoWork. Worker {Id} back to order {Order}",
			   implementer.Id, runOrder.Id);
				// доделываем работу
				Thread.Sleep(implementer.WorkExperience * _rnd.Next(100, 300) *
			   runOrder.Count);
				_logger.LogDebug("DoWork. Worker {Id} finish order {Order}",
			   implementer.Id, runOrder.Id);
				_orderLogic.FinishOrder(new OrderBindingModel
				{
					Id = runOrder.Id
				});
				// отдыхаем
				Thread.Sleep(implementer.Qualification * _rnd.Next(10, 100));
			}
			// заказа может не быть, просто игнорируем ошибку
			catch (InvalidOperationException ex)
			{
				_logger.LogWarning(ex, "Error try get work");
			}
			// а может возникнуть иная ошибка, тогда просто заканчиваем выполнение имитации
			catch (Exception ex)
			{
				_logger.LogError(ex, "Error while do work");
				throw;
			}
		}

		private async Task RunWaitingOrder(ImplementerViewModel implementer)
		{
			if (_orderLogic == null || implementer == null)
			{
				return;
			}
			try
			{
				var order = await Task.Run(() => _orderLogic.ReadElement(new OrderSearchModel
				{
					ImplementerId = implementer.Id,
					Status = OrderStatus.Ожидается,
				}));
				if (order == null)
				{
					return;
				}
				_logger.LogDebug("DoWork. Worker {Id} finish order {Order}", implementer.Id, order.Id);
				_orderLogic.DeliveryOrder(new OrderBindingModel
				{
					Id = order.Id,
					ImplementerId = implementer.Id
				});
				Thread.Sleep(implementer.Qualification * _rnd.Next(10, 100));
			}
			catch (InvalidOperationException ex)
			{
				_logger.LogWarning(ex, "Error try get work");
			}
			catch (Exception ex)
			{
				_logger.LogError(ex, "Error while do work");
				throw;
			}
		}
	}
}