private void SubscribeToChanges(ProductInOrder newProductInOrder)
{
newProductInOrder.WhenAnyValue(x => x.SelectedDiscount, x => x.SelectedQuantity)
.Subscribe(a =>
{
int newSelectedDiscount = a.Item1;
int newSelectedQuantity = a.Item2;
//-UnitPrice или +UnitPrice к TotalSum и цене товара в заказке
decimal newValue = (newSelectedQuantity - (short)newProductInOrder.SourceProductOnStore.UnitsOnOrder) * (decimal)newProductInOrder.UnitPrice;
//-1% или +1% скидки от товара
decimal percentageOff = (decimal)(newSelectedDiscount - newProductInOrder.PreviousSelectedDiscount) / 100;
//Запускается когда меняется SelectedDiscount
if (percentageOff != 0)
{
newProductInOrder.Sum -= newProductInOrder.SelectedQuantity * (decimal)newProductInOrder.UnitPrice * percentageOff;
TotalSum -= newProductInOrder.SelectedQuantity * (decimal)newProductInOrder.UnitPrice * percentageOff;
}
//Запускается когда меняется SelectedQuantity и при этом SelectedDiscount больше нуля
else if (newSelectedDiscount != 0)
{
//
decimal sumOff = ((decimal)newProductInOrder.PreviousSelectedDiscount / 100) * newProductInOrder.SelectedQuantity * (decimal)newProductInOrder.UnitPrice;
decimal sumToAdd = sumOff - newProductInOrder.Sum;
newProductInOrder.Sum = sumOff;
TotalSum += sumToAdd;
return;
}
newProductInOrder.PreviousSelectedDiscount = newSelectedDiscount;
newProductInOrder.Sum += newValue;
TotalSum += newValue;
});
newProductInOrder.WhenAnyValue(x => x.SelectedQuantity)
.Select(newSelectedQuantity =>
{
short?unitsOnOrder = newProductInOrder.SourceProductOnStore.UnitsOnOrder;
return(newSelectedQuantity - unitsOnOrder);
})
.Subscribe(newValue =>
{
newProductInOrder.SourceProductOnStore.UnitsInStock -= (short)newValue;
newProductInOrder.SourceProductOnStore.UnitsOnOrder += (short)newValue;
SaveChangesToProducts(newProductInOrder, (int)newValue);
});
}
private void SubscribeToChanges(ProductInOrder newProductInOrder)
{
int previousSelectedQuantity = 0;
newProductInOrder.WhenAnyValue(x => x.SelectedDiscount, x => x.SelectedQuantity)
.Subscribe(a =>
{
float newSelectedDiscount = a.Item1;
int newSelectedQuantity = a.Item2;
//Value(price) that will be added(or removed) to(from) TotalPrice
decimal newValue = (decimal)newProductInOrder.UnitPrice * (newSelectedQuantity - previousSelectedQuantity);
//-1% or +1% discount
decimal percentageOff = (decimal)(newSelectedDiscount - newProductInOrder.PreviousSelectedDiscount) / 100;
//Executing when the SelectedDiscount has changed
if (percentageOff != 0)
{
newProductInOrder.Sum -= newProductInOrder.SelectedQuantity * (decimal)newProductInOrder.UnitPrice * percentageOff;
TotalSum -= newProductInOrder.SelectedQuantity * (decimal)newProductInOrder.UnitPrice * percentageOff;
}
//Executing when the SelectedQuantity has changed and the SelectedDiscount is greater than zero.
else if (newSelectedDiscount != 0)
{
decimal sumOff = ((decimal)newProductInOrder.PreviousSelectedDiscount / 100) * newProductInOrder.SelectedQuantity * (decimal)newProductInOrder.UnitPrice;
decimal sumToAdd = sumOff - newProductInOrder.Sum;
newProductInOrder.Sum = sumOff;
TotalSum += sumToAdd;
TotalSumString = TotalSum.ToString("C2");
return;
}
newProductInOrder.PreviousSelectedDiscount = newSelectedDiscount;
newProductInOrder.Sum += newValue;
TotalSum += newValue;
TotalSumString = TotalSum.ToString("C2");
});
newProductInOrder.WhenAnyValue(x => x.SelectedQuantity)
.Select(newSelectedQuantity =>
{
if (newSelectedQuantity == 0)
{
return(0);
}
int deltaQuantity = newSelectedQuantity - previousSelectedQuantity; //Quantity of products that will be added or removed(in case of negative value) from the stock of the current product
previousSelectedQuantity = newSelectedQuantity;
return(deltaQuantity);
})
.Subscribe(newValue =>
{
newProductInOrder.SourceProductOnStore.UnitsInStock -= (short)newValue;
Product productToReplace = productsList.First(x => x.ProductID == newProductInOrder.ProductID);
productToReplace.UnitsInStock -= (short)newValue;
});
}
