public List <ToDoItemDTO> UpdateToDoItemPosition(Guid listId, Guid itemId, int position, string owner)
{
ToDoList toDoList = GetToDoList(listId, owner);
if (toDoList == null)
{
throw new EntityNotFoundException();
}
else if (toDoList.Owner != owner)
{
throw new UnauthorizedException();
}
ToDoItem toDoItem = toDoList.Items.SingleOrDefault(i => i.Id.Equals(itemId));
if (toDoItem == null)
{
throw new EntityNotFoundException();
}
int maxPosition = toDoList.Items.Count - 1;
if (position > maxPosition || position < 0)
{
throw new InvalidPositionException();
}
toDoItem.UpdatePosition(position);
_context.SaveChanges();
return(GetToDoItems(listId, owner));
}