private async Task <DialogTurnResult> RunStepAsync(DialogContext dc, string option = null)
{
// Find the current conversation tree node using the saved Step state.
var node = _rootNode;
if (dc.ActiveDialog.State.ContainsKey(DialogStateCurrentNodeId))
{
node = _rootNode.Find(Convert.ToInt32(dc.ActiveDialog.State[DialogStateCurrentNodeId]));
}
// Find the node that contains the actions for the reply.
var nextNode = (option != null && node.ChildNodes.ContainsKey(option))
? node.ChildNodes[option]
: node;
// Process the actions, creating a list of activities to send back to the player.
var activities = new List <IActivity>();
//
foreach (var action in nextNode.Actions)
{
switch (action)
{
case GoToConversationTopicAction goToConversationTopicAction:
if (string.Equals(goToConversationTopicAction.Topic, "root", StringComparison.OrdinalIgnoreCase))
{
nextNode = _rootNode;
}
else if (node.ParentId.HasValue)
{
nextNode = _rootNode.Find(node.ParentId.Value);
}
break;
case EndConversationAction endConversationAction:
nextNode = null;
break;
default:
action.Execute(dc, activities, _gameFlags);
break;
}
}
// Check if the conversation tree should continue;
if (nextNode != null)
{
// If there are no child nodes in the next node, there's nothing for the player to do.
// Revert to the current node for the next turn.
if (!nextNode.ChildNodes.Any())
{
nextNode = node;
}
// List the conversation tree options for the player.
var options = nextNode.ChildNodes.Select(s => s.Key).ToArray();
// Add the conversation tree options to the last outbound messages activity.
var lastMessageIndex = activities.FindLastIndex(a => a.Type == ActivityTypes.Message);
var text = activities[lastMessageIndex].AsMessageActivity().Text;
activities[lastMessageIndex] = MessageFactory.SuggestedActions(options, text);
}
// Send all activities to the client.
await dc.Context.SendActivitiesAsync(activities.ToArray());
// Update the state so the next turn will start at the correct location in the dialog tree.
if (nextNode != null)
{
dc.ActiveDialog.State[DialogStateCurrentNodeId] = nextNode.Id;
return(new DialogTurnResult(DialogTurnStatus.Waiting));
}
// Or end the dialog tree if there's no next node.
await dc.EndDialogAsync();
return(new DialogTurnResult(DialogTurnStatus.Complete));
}