/// <summary>
/// Check Out Book, make changes to the database and local collections
/// </summary>
/// <param name="book">Book to be checked out</param>
/// <param name="cardHolder">MCardholder that is checking out the book</param>
/// <param name="error">an error string to be outputted should a check out error occur</param>
/// <returns></returns>
public bool CheckOut(Book book, MCardholder cardHolder, out string error)
{
if (!IsLibrarian) //if not a librarian
{
error = "You are not authorized to check out a book.";
return(false);
}
if (cardHolder.HasOverdueBooks)
{
error = "User has Overdue books, cannot check out additional books.";
return(false);
}
if (book.CopiesAvailable > 0) //Make sure that there is a copy available
{
//Create a checkout log
CheckOutLog log = new CheckOutLog
{
Book = book,
Book_BookId = book.BookId,
CheckOutDate = DateTime.Now,
Cardholder_PersonId = cardHolder.ID,
Cardholder = cardHolder.Cardholder
};
try
{
//Add log to context and save
context.CheckOutLogs.Add(log);
context.SaveChanges();
}
catch (Exception ex)
{
while (ex != null)
{
ex = ex.InnerException;
}
DatabaseEventArgs e = new DatabaseEventArgs(ex.Message);
OnDatabaseErrorRaised(e);
error = "Cannot check out book. Please try again later.";
return(false);
}
//add log to memory collection
checkoutLogs.Add(log);
error = "";
return(true);
}
error = string.Format("{0} could not be checked out, no copies available", book.Title);
return(false);
}
/// <summary>
/// Verifies that the UserID exists and retrives the associated MCardholder from collection
/// </summary>
/// <returns>Returns true if UserID is valid, false otherwise</returns>
private bool VerifyUserID()
{
cardHolder = controller.GetCardHolder(LibraryCardIDTextBox.Text); //Retrieve MCardholder
if (cardHolder == null) //MCardholder not found, notify user and prep for user input
{
ErrorLabel.Content = "Library Card ID not found.";
LibraryCardIDTextBox.Focus();
return(false);
}
return(true);
}
/// <summary>
/// Retrives a MCardholder object that is associated with the libraryCardID passed in the argument
/// </summary>
/// <param name="libraryCardID">libraryCardID of MCardholder</param>
/// <returns>Returns MCardholder found in collection, returns null otherwise.</returns>
public MCardholder GetCardHolder(string libraryCardID)
{
MCardholder result = null;
try
{
result = CardholderLibraryCardIDs[libraryCardID];
}
catch (KeyNotFoundException)
{
result = null;
}
return(result);
}
private ObservableCollection <Book> books; //A list of books to check out
/// <summary>
/// Constructor for CheckOutWindow
/// Initializes fields and preps the window for user interaction
/// </summary>
/// <param name="controller"></param>
public CheckOutWindow(LibraryClientController controller)
{
InitializeComponent();
//initialize fields
this.controller = controller;
cardHolder = null;
books = new ObservableCollection <Book>();
BooksListView.ItemsSource = books;
//subscribe to OnDatabaseError event
this.controller.OnDatabaseError += OnDatabaseErrorHandler;
//preps window for user interaction
ResetWindow();
}
//Returns a generic list of
/// <summary>
/// Retrives a list of KeyvaluePair <CheckOutLog, MCardholder> Where the key value is an overdue CheckOutLog and the value is
/// the MCardholder that is associated with that CheckOutLog.
/// </summary>
/// <returns>A generic list of KeyValuePair <CheckOutLog, MCardholder></returns>
public List <KeyValuePair <CheckOutLog, MCardholder> > GetOverdueList()
{
//initialize list
List <KeyValuePair <CheckOutLog, MCardholder> > overdueList = new List <KeyValuePair <CheckOutLog, MCardholder> >();
//get overdue logs
List <CheckOutLog> overdueLogs = checkoutLogs.OverdueLogs;
//find the corresponding MCardholder from peopleList
foreach (CheckOutLog key in overdueLogs)
{
MCardholder value = (from p in peopleList.Cardholders
where p.ID == key.Cardholder_PersonId
select p).SingleOrDefault();
//create KeyValuePair and add to list
KeyValuePair <CheckOutLog, MCardholder> kvp = new KeyValuePair <CheckOutLog, MCardholder>(key, value);
overdueList.Add(kvp);
}
return(overdueList);
}
/// <summary>
/// Retrieves all Librarians, Cardholders, and Authors from database context to generate local memory objects.
/// Populates local memory collections with the newly created objects.
/// </summary>
private void LoadPeopleList()
{
//Initialize peopleList
peopleList = new PeopleList();
LibrarianUserIDs = new Dictionary <string, string>();
CardholderLibraryCardIDs = new Dictionary <string, MCardholder>();
//Librarians
var dbLibrarians = (from l in context.Librarians
select l).ToList();
foreach (Librarian l in dbLibrarians)
{
MLibrarian ml = new MLibrarian(l);
peopleList.Add(ml);
LibrarianUserIDs.Add(ml.UserID, ml.Password);
}
//Cardholders
var dbCardholders = (from ch in context.Cardholders
select ch).ToList();
foreach (Cardholder ch in dbCardholders)
{
MCardholder mch = new MCardholder(ch);
peopleList.Add(mch);
CardholderLibraryCardIDs.Add(mch.LibraryCardId, mch);
}
//Authors
var dbAuthors = (from a in context.Authors
select a).ToList();
foreach (Author a in dbAuthors)
{
MAuthor ma = new MAuthor(a);
peopleList.Add(ma);
}
}
