/// <summary>
/// Adds the line item directly to the current <see cref="Sale"/>.
/// </summary>
/// <param name="lineItem"></param>
public void AddLineItem(SalesLineItem lineItem)
{
if (lineItem != null)
{
LineItems.Add(lineItem);
}
}
/// <summary>
/// <para>Creates a new line item for the given product if one does not already exit and adds it to the current <see cref="Sale"/>.</para>
/// <para>Otherwise, the existing line item's quantity is updated.</para>
/// </summary>
/// <param name="product"></param>
/// <param name="quantity"></param>
public void MakeLineItem(Product product, int quantity)
{
if (product == null)
{
return;
}
var lineItem = new SalesLineItem(product, quantity);
var existingLineItem = LineItems.SingleOrDefault(i => i.Equals(lineItem));
if (existingLineItem == null)
{
LineItems.Add(lineItem);
}
else
{
existingLineItem.AddQuantity(lineItem.Quantity);
}
}
