public async Task ProceedNextOrderAsync()
{
if (_ordersQueue.Count == 0)
{
return;
}
OrderDto order = _ordersQueue.Dequeue();
if (order == null)
{
return;
}
await _orderService.ChangeOrderStateAsync(order, OrderStateDto.Assignment); //2. Change order state to Assignment
PointDto orderLocationPoint = _pointService.GetOrderLocation(order.Id); //3. Get order destination point coordinates
IEnumerable <CourierDto> couriers = _courierService.GetNearestCouriers(orderLocationPoint); //4. Find nearest couriers by next criterias (distance to point > number of assigned orders > courier state)
var possibleCandidate = couriers.FirstOrDefault(courier => courier.State == CourierStateDto.Idle);
if (possibleCandidate != null)
{
await _orderService.ChangeOrderStateAsync(order, OrderStateDto.WaitingOnWarehouse);
await _courierService.AssignOrder(possibleCandidate.Id, order.Id);
}
else
{
RouteCandidate bestRoute = await FindBestCandidateAsync(couriers, orderLocationPoint);
if (bestRoute == null)
{
await _orderService.ChangeOrderStateAsync(order, OrderStateDto.NotAssigned);
_ordersQueue.Enqueue(order);
}
else
{
await _orderService.ChangeOrderStateAsync(order, OrderStateDto.WaitingOnWarehouse);
await _courierService.AssignOrder(bestRoute.Courier.Id, order.Id);
await _routeService.ChangeCourierCurrentRouteAsync(bestRoute.Courier.Id, bestRoute.GetRoute());
}
}
}