/// <summary>
/// Validates the constraint against the <see cref="ILineItemContainer"/>
/// </summary>
/// <param name="value">
/// The value to object to which the constraint is to be applied.
/// </param>
/// <param name="customer">
/// The <see cref="ICustomerBase"/>.
/// </param>
/// <returns>
/// The <see cref="Attempt{ILineItemContainer}"/> indicating whether or not the constraint can be enforced.
/// </returns>
public override Attempt <ILineItemContainer> TryApply(ILineItemContainer value, ICustomerBase customer)
{
if (Quantity <= 0)
{
return(Attempt <ILineItemContainer> .Succeed(value));
}
var total = value.Items.Sum(x => x.Quantity);
return(StringOperatorHelper.Evaluate(total, Quantity, Operator) ?
this.Success(value) :
this.Fail(value, "The total quantity of items failed to pass the configured condition."));
}
/// <summary>
/// Visits the line items to apply expression.
/// </summary>
/// <param name="lineItem">
/// The line item.
/// </param>
public void Visit(ILineItem lineItem)
{
if (lineItem.LineItemType == LineItemType.Product)
{
if (StringOperatorHelper.Evaluate(
_property == "price" ? lineItem.TotalPrice : lineItem.Quantity,
_target,
this._operator))
{
FilteredLineItems.Add(lineItem);
}
}
else
{
FilteredLineItems.Add(lineItem);
}
}