private void ChangeMessages(ModifyModel modifyModel, CommunityViewModel changingViewModel)
{
switch (modifyModel.Modification.ModificationType)
{
case ModificationType.Add:
AddMessage();
break;
case ModificationType.Remove:
RemoveMessage();
break;
case ModificationType.Change:
RemoveMessage();
AddMessage();
break;
}
void AddMessage()
{
MessageModel messageModel = modifyModel.Modification.NewValue.AssertTypeOf <MessageModel>();
MessageViewModel viewModel = messageModel.CreateViewModel(changingViewModel);
changingViewModel.AddItem(viewModel);
(changingViewModel.FindItemByType <AgentViewModel>()?.AvailableItems
?? changingViewModel.FindItemByType <MessageViewModel>()?.AvailableItems)?.AvailableMessages.Add(viewModel);
}
void RemoveMessage()
{
MessageModel messageModel = modifyModel.Modification.OldValue.AssertTypeOf <MessageModel>();
MessageViewModel viewModel = (MessageViewModel)changingViewModel.FindViewItemById(messageModel.Id);
changingViewModel.RemoveItem(viewModel);
(changingViewModel.FindItemByType <AgentViewModel>()?.AvailableItems
?? changingViewModel.FindItemByType <MessageViewModel>()?.AvailableItems)?.AvailableMessages.Remove(viewModel);
}
}