void SendDisposition()

in src/AmqpSession.cs [1012:1092]
73 lines of code
12 McCabe index (conditional complexity)

            void SendDisposition()
            {
                List<DispositionInfo> disposedDeliveries = new List<DispositionInfo>();
                int settledCount = 0;

                lock (this.syncRoot)
                {
                    Delivery current = this.firstUnsettled;
                    Delivery firstChanged = null;
                    uint? lastId = null;
                    while (current != null)
                    {
                        if (current.StateChanged)
                        {
                            if (firstChanged == null)
                            {
                                firstChanged = current;
                            }
                            else
                            {
                                if (current.Settled == firstChanged.Settled &&
                                    CanBatch(current.State as Outcome, firstChanged.State as Outcome))
                                {
                                    lastId = current.DeliveryId.Value;
                                }
                                else
                                {
                                    disposedDeliveries.Add(new DispositionInfo(firstChanged, lastId));
                                    firstChanged = current;
                                    lastId = null;
                                }
                            }

                            // Move next and remove if settled
                            if (current.Settled)
                            {
                                Delivery temp = current;
                                current = current.Next;
                                ++settledCount;
                                Delivery.Remove(ref this.firstUnsettled, ref this.lastUnsettled, temp);
                            }
                            else
                            {
                                current.StateChanged = false;
                                current = current.Next;
                            }
                        }
                        else
                        {
                            if (firstChanged != null)
                            {
                                disposedDeliveries.Add(new DispositionInfo(firstChanged, lastId));
                                firstChanged = null;
                                lastId = null;
                            }

                            current = current.Next;
                        }
                    }

                    if (firstChanged != null)
                    {
                        disposedDeliveries.Add(new DispositionInfo(firstChanged, lastId));
                    }

                    this.sendingDisposition = false;
                }

                if (disposedDeliveries.Count > 0)
                {
                    foreach (var info in disposedDeliveries)
                    {
                        this.SendDisposition(info);
                    }
                }

                if (settledCount > 0)
                {
                    this.OnWindowMoved(settledCount);
                }
            }