public Book Add(Book item)
{
ChangePriority(item);
item.Id = nextId;
books.Add(item);
nextId++;
return item;
}
// PUT api/listtoread/5
public void Put(Book item)
{
if (ModelState.IsValid)
{
item.Priority = GetPriority(item);
repository.Update(item);
}
}
public void Update(Book item)
{
var removed = books.Find(x => x.Id == item.Id);
if (removed != null)
{
ChangePriority(item);
Delete(item.Id);
}
books.Add(item);
}
protected int GetPriority(Book item)
{
int lastPriority = repository.GetNextPriority();
if (!item.Priority.HasValue || item.Priority == 0 || item.Priority > lastPriority)
{
if (item.Id != 0)
{
return lastPriority - 1;
}
}
return item.Priority.Value;
}
public Book Post(Book item)
{
if (ModelState.IsValid)
{
item.Priority = GetPriority(item);
return repository.Add(item);
}
else
{
Request.CreateErrorResponse(HttpStatusCode.BadRequest, ModelState);
}
return null;
}
protected void ChangePriority(Book item)
{
if (item.Priority > 0)
{
var book = books.Find(x => x.Priority == item.Priority);
if (book != null)
{
if (item.Id != 0)
{
if (book != null)
{
var oldBook = books.Find(x => x.Id == item.Id);
book.Priority = oldBook.Priority;
}
}
else
{
book.Priority = (books.Count + 1);
}
UpdateWithoutChanhgePriority(book);
}
}
else
{
item.Priority = ( books.Count + 1);
}
}
protected void UpdateWithoutChanhgePriority(Book item)
{
var removed = books.Find(x => x.Id == item.Id);
if (removed != null)
{
Delete(item.Id);
}
books.Add(item);
}