/// <summary>
/// dispatch the dvd
/// </summary>
/// <param name="dvdRequest"></param>
/// <param name="dvds"></param>
/// <returns></returns>
private static bool dispatch(Rental dvdRequest, DVD dvd)
{
try
{
// add dvd to rental
var therental = db.Rentals.First(r => r.RentalID == dvdRequest.RentalID);
var theDVD = db.DVDs.First(d => d.DvdID == dvd.DvdID);
therental.DateSent = DateTime.Now;
therental.DateDue = DateTime.Now.AddDays(14);
therental.QueuePosition = null;
therental.Dvd = dvd;
therental.DvdID = dvd.DvdID;
db.SaveChanges();
theDVD.Rentals.Add(therental);
theDVD.State = "rented";
// dispatch
db.SaveChanges();
}
catch (Exception)
{
return false;
}
return true;
}
/// <summary>
/// checks if dvd is available, then dispatches it and sends user a message
/// </summary>
/// <param name="dvdRequest">the rental wanting a dvd</param>
/// <returns>true if dispatched, false if not</returns>
public static bool RequestDVD(Rental dvdRequest)
{
var dvds = db.DVDs.Where(d => d.MovieID == dvdRequest.MovieID && d.State.Equals("available"));
if (dvds.Any())
{
return dispatch(dvdRequest, dvds.First()) && msgSend(dvdRequest.User, dvdRequest.Movie);
}
// no DVDs available
return false;
}
/// <summary>
/// handles a returned dvd and realocates it
/// </summary>
/// <param name="dvdReturn"></param>
/// <returns></returns>
public static bool ReturnDVD(Rental dvdReturn)
{
try
{
// "return" dvd
var toReturn = db.Rentals.First(r => r.RentalID == dvdReturn.RentalID);
toReturn.DateReturned = DateTime.Now;
toReturn.Dvd.State = "available";
db.SaveChanges();
}
catch (Exception)
{
return false;
}
// hand over to newt user
return realocateDVD(dvdReturn.Dvd);
}
/// <summary>
/// the code which created a new queue item
/// </summary>
/// <param name="id"></param>
private void rentMovie(int id)
{
try
{
var movie = db.Movies.First(m => m.MovieID == id);
var user = db.Users.First(u => u.Username == User.Identity.Name);
var position = 0;
if (user.Queue.Any())
{
if (user.Queue.Any(r => r.QueuePosition != null))
{
position = user.Queue.Count(r => r.QueuePosition != null) + 1;
}
}
var newQueueItem = new Rental
{
DateDue = null,
DateOfRental = DateTime.Now,
DateReturned = null,
DateSent = null,
Movie = movie,
MovieID = movie.MovieID,
User = user,
UserID = user.UserID,
QueuePosition = position
};
db.Rentals.Add(newQueueItem);
db.SaveChanges();
user.Queue.Add(newQueueItem);
movie.Rentals.Add(newQueueItem);
db.SaveChanges();
// try getting a dvd
Dispatch.RequestDVD(newQueueItem);
}
catch (Exception)
{
throw new AddToQueueFailedException();
}
}