/// <summary>
/// Checking the item in to the earliest subscriber to have placed a hold
/// </summary>
/// <param name="assetId"></param>
/// <param name="currentHolds"></param>
private void CheckoutToEarliestHold(int assetId, IEnumerable <Hold> currentHolds)
{
Hold earliestHold = currentHolds.OrderBy(a => a.HoldPlaced).FirstOrDefault();
CMSLibraryCard card = earliestHold.LibraryCard;
_context.Remove(earliestHold);
_context.SaveChanges();
CheckoutItem(assetId, card.Id);
}
/// <summary>
/// Checks out an CMSLibraryAsset to a library card id and fills the entry in history
/// </summary>
/// <param name="assetId"></param>
/// <param name="libraryCardId"></param>
public string CheckoutItem(int assetId, int libraryCardId)
{
if (IsCheckedOut(assetId))
{
return("Double Checked Out!"); // don't double checkout
}
DateTime now = DateTime.Now;
CMSLibraryAsset item = _context.CMSLibraryAsset
.Include(a => a.Status)
.FirstOrDefault(a => a.Id == assetId);
CMSLibraryCard libraryCard = _context.CMSLibraryCard
.Include(c => c.Checkouts)
.FirstOrDefault(a => a.Id == libraryCardId);
if (libraryCard == null)
{
return("Invalid card!"); // make sure the library card is valid
}
IEnumerable <Hold> currentHolds = GetCurrentHolds(assetId);
if (!currentHolds.Any())
{
// Changes the status of the asset to "Checked Out" if the Hold queue is empty
UpdateStatus(assetId, "Checked Out");
}
Checkout checkout = new Checkout // creating the checkout
{
LibraryAsset = item,
LibraryCard = libraryCard,
Since = now,
Until = GetDefaultCheckoutTime(now, assetId)
};
_context.Add(checkout);
CheckoutHistory checkoutHistory = new CheckoutHistory // creating the checkout history
{
CheckedOut = now,
LibraryAsset = item,
LibraryCard = libraryCard
};
_context.Add(checkoutHistory);
_context.SaveChanges();
return(null);
}
/// <summary>
/// Places a Hold to the item linked to a card id and subscriber
/// </summary>
/// <param name="assetId"></param>
/// <param name="libraryCardId"></param>
/// <returns></returns>
public string PlaceHold(int assetId, int libraryCardId)
{
DateTime now = DateTime.Now;
CMSLibraryAsset asset = _context.CMSLibraryAsset
.Include(a => a.Status)
.FirstOrDefault(a => a.Id == assetId);
CMSLibraryCard libraryCard = _context.CMSLibraryCard
.FirstOrDefault(a => a.Id == libraryCardId);
if (libraryCard == null) // when the card is not valid
{
return("Invalid card!");
}
else if (GetLatestCheckout(assetId).LibraryCard.Id == libraryCardId) // when the checkouter is trying to place a hold
{
return("You cannot place a hold on an item which you have checked out!");
}
else if (GetCurrentHolds(assetId).Any(a => a.LibraryCard.Id == libraryCardId)) // when you are trying to place a second hold on an item
{
return("You have allready placed a hold on that item!");
}
_context.Update(asset);
if (asset.Status.Name == "Checked Out")
{
UpdateStatus(assetId, "On Hold");
}
Hold hold = new Hold
{
HoldPlaced = now,
LibraryAsset = asset,
LibraryCard = libraryCard
};
_context.Add(hold);
_context.SaveChanges();
return(null);
}