/// <summary>
/// Initializes a new instance of the <see cref="OfferItem"/> class for the specified product.
/// </summary>
/// <param name="draftItem"><see cref="OfferDraftItem"/> from which the offer item is created.</param>
public OfferItem(OfferDraftItem draftItem)
{
if (draftItem == null)
throw new ArgumentNullException("draftItem");
_product = draftItem.Product;
_quantity = draftItem.Quantity;
_discount = draftItem.Discount;
_productPrice = _product.Price;
_discountAmount = draftItem.DiscountAmount;
_itemTotal = draftItem.ItemTotal;
_itemSubtotal = draftItem.ItemSubtotal;
}
/// <summary>
/// Adds a new item to the offer.
/// </summary>
/// <param name="item">An item to add to the offer.</param>
public virtual void AddItem(OfferDraftItem item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (item.OfferDraft != null)
{
throw new ArgumentException("Item is already contained in a draft.");
}
item.OfferDraft = this;
_items.Add(item);
}
/// <summary>
/// Removes the specified item from the offer.
/// </summary>
/// <param name="item">An item to remove from the offer.</param>
public virtual void RemoveItem(OfferDraftItem item)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (!Equals(item.OfferDraft, this))
{
throw new ArgumentException("Item is not part of current draft.", "item");
}
item.OfferDraft = null;
_items.Remove(item);
}
/// <summary>
/// Initializes a new instance of the <see cref="OfferItem"/> class for the specified product.
/// </summary>
/// <param name="draftItem"><see cref="OfferDraftItem"/> from which the offer item is created.</param>
public OfferItem(OfferDraftItem draftItem)
{
if (draftItem == null)
{
throw new ArgumentNullException("draftItem");
}
_product = draftItem.Product;
_quantity = draftItem.Quantity;
_discount = draftItem.Discount;
_productPrice = _product.Price;
_discountAmount = draftItem.DiscountAmount;
_itemTotal = draftItem.ItemTotal;
_itemSubtotal = draftItem.ItemSubtotal;
}
/// <summary>
/// Creates a new draft from given offer.
/// </summary>
/// <returns>A new <see cref="OfferDraft"/> instance.</returns>
public static OfferDraft CreateFromOffer(Offer sourceOffer)
{
if (sourceOffer == null)
{
throw new ArgumentNullException("sourceOffer");
}
var draft = new OfferDraft(sourceOffer);
foreach (var item in sourceOffer.Items)
{
var draftItem = new OfferDraftItem(item.Product, item.Quantity);
draft.AddItem(draftItem);
draft.ChangeItemDiscount(draftItem, item.Discount);
}
return(draft);
}
/// <summary>
/// Changes discount for given item.
/// </summary>
/// <param name="item">Item for which to change discount.</param>
/// <param name="discount">Discount for the item.</param>
public virtual void ChangeItemDiscount(OfferDraftItem item, int discount)
{
if (item == null)
{
throw new ArgumentNullException("item");
}
if (!Items.Contains(item))
{
throw new ArgumentException("Item is not part of current draft.", "item");
}
// Dummy business rule - at most 5 items can have an additional discount.
if ((discount > 0) && (item.Discount == 0))
{
var itemsWithDiscount = Items.Count(x => x.Discount > 0);
if (itemsWithDiscount >= 5)
{
throw new InvalidOperationException("At most 5 items can have a special discount.");
}
}
item.Discount = discount;
}
/// <summary>
/// Removes the specified item from the offer.
/// </summary>
/// <param name="item">An item to remove from the offer.</param>
public virtual void RemoveItem(OfferDraftItem item)
{
if (item == null)
throw new ArgumentNullException("item");
if (!Equals(item.OfferDraft, this))
throw new ArgumentException("Item is not part of current draft.", "item");
item.OfferDraft = null;
_items.Remove(item);
}
/// <summary>
/// Changes discount for given item.
/// </summary>
/// <param name="item">Item for which to change discount.</param>
/// <param name="discount">Discount for the item.</param>
public virtual void ChangeItemDiscount(OfferDraftItem item, int discount)
{
if (item == null)
throw new ArgumentNullException("item");
if (!Items.Contains(item))
throw new ArgumentException("Item is not part of current draft.", "item");
// Dummy business rule - at most 5 items can have an additional discount.
if ((discount > 0) && (item.Discount == 0))
{
var itemsWithDiscount = Items.Count(x => x.Discount > 0);
if (itemsWithDiscount >= 5)
throw new InvalidOperationException("At most 5 items can have a special discount.");
}
item.Discount = discount;
}
/// <summary>
/// Adds a new item to the offer.
/// </summary>
/// <param name="item">An item to add to the offer.</param>
public virtual void AddItem(OfferDraftItem item)
{
if (item == null)
throw new ArgumentNullException("item");
if (item.OfferDraft != null)
throw new ArgumentException("Item is already contained in a draft.");
item.OfferDraft = this;
_items.Add(item);
}
/// <summary>
/// Creates a new draft from given offer.
/// </summary>
/// <returns>A new <see cref="OfferDraft"/> instance.</returns>
public static OfferDraft CreateFromOffer(Offer sourceOffer)
{
if (sourceOffer == null)
throw new ArgumentNullException("sourceOffer");
var draft = new OfferDraft(sourceOffer);
foreach (var item in sourceOffer.Items)
{
var draftItem = new OfferDraftItem(item.Product, item.Quantity);
draft.AddItem(draftItem);
draft.ChangeItemDiscount(draftItem, item.Discount);
}
return draft;
}
