public ShelfErrorCodes ChangeShelf(int shelfID, int hallID = 0, int shelfNumber = 0)
{
var shelf = shelfManager.GetShelf(shelfID);
if (shelf == null)
{
return(ShelfErrorCodes.NoSuchShelf);
}
else
{
if (hallID != 0)
{
var existingHall = hallManager.GetHall(hallID);
if (existingHall == null)
{
return(ShelfErrorCodes.NoSuchHall);
}
shelfManager.ChangeShelfHall(shelf, hallID);
return(ShelfErrorCodes.TheShelfHasChangedHall);
}
else
{
var existingShelfNumber = shelfManager.GetShelfByShelfNumber(shelf.HallID, shelfNumber);
if (existingShelfNumber != null)
{
return(ShelfErrorCodes.ShelfNumberOccupied);
}
else
{
shelfManager.ChangeShelfNumber(shelf, shelfNumber);
}
return(ShelfErrorCodes.TheShelfNumberHasBeenChanged);
}
}
}