using PlumbingRepairContracts.BindingModels;
using PlumbingRepairContracts.BusinessLogicsContracts;
using PlumbingRepairContracts.SearchModels;
using PlumbingRepairContracts.ViewModels;

using Microsoft.Extensions.Logging;
using PlumbingRepairDataModels.Enums;

namespace PlumbingRepairBusinessLogic.BusinessLogics
{
    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)
			{
				_logger.LogWarning("DoWork. Orders is null");
				return;
			}
			orders.AddRange(_orderLogic.ReadList(new() { Status = OrderStatus.Выполняется }) ?? new());
			orders.AddRange(_orderLogic.ReadList(new() { Status = OrderStatus.Ожидание }) ?? new());
			if (orders.Count == 0)
            {
                _logger.LogWarning("DoWork. Orders is empty");
                return;
            }
            _logger.LogDebug("DoWork for {Count} orders", orders.Count);
            foreach (var implementer in implementers)
            {
                Task.Run(() => WorkerWorkAsync(implementer, orders));
            }
        }

        /// <summary>
        /// Иммитация работы исполнителя
        /// </summary>
        /// <param name="implementer"></param>
        /// <param name="orders"></param>
        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,
							ImplementerId = implementer.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;
                    }
                    
                }
            });
        }

        /// <summary>
        /// Ищем заказ, которые уже в работе (вдруг исполнителя прервали)
        /// </summary>
        /// <param name="implementer"></param>
        /// <returns></returns>
        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
                });
				_logger.LogDebug("DoWork. Worker {Id} delivery order {Order}", implementer.Id, runOrder.Id);
				_orderLogic.DeliveryOrder(new() { 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.Ожидание
				}));
				if (order == null)
				{
					return;
				}
				_logger.LogDebug("DoWork. Worker {Id} delivery order {Order}", implementer.Id, order.Id);
				_orderLogic.DeliveryOrder(new OrderBindingModel
				{
					Id = order.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;
			}
		}
	}
}