DlgNode_Selector.cpp

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// Copyright Csaba Molnar, Daniel Butum. All Rights Reserved.
#include "Nodes/DlgNode_Selector.h"
#include "DlgConstants.h"
#include "DlgContext.h"
#include "Logging/DlgLogger.h"
 
 
bool UDlgNode_Selector::HandleNodeEnter(UDlgContext& Context, TSet<const UDlgNode*> NodesEnteredWithThisStep)
{
    FireNodeEnterEvents(Context);
 
    if (NodesEnteredWithThisStep.Contains(this))
    {
        FDlgLogger::Get().Errorf(
            TEXT("SelectorNode::HandleNodeEnter - Failed to enter selector node, it was entered multiple times in a single step."
                    "Theoretically with some condition magic it could make sense, but chances are that it is an endless loop,"
                    "thus entering the same selector twice with a single step is not supported. Dialogue is terminated.\nContext:\n\t%s"),
            *Context.GetContextString()
        );
 
        return false;
    }
    NodesEnteredWithThisStep.Add(this);
 
    switch (SelectorType)
    {
        case EDlgNodeSelectorType::First:
        {
            // Find first child with satisfies conditions
            for (const FDlgEdge& Edge : Children)
                if (Edge.Evaluate(Context, {this}))
                    return Context.EnterNode(Edge.TargetIndex, NodesEnteredWithThisStep);
 
            break;
        }
 
        case EDlgNodeSelectorType::Random:
        {
            // Build the list of all valid children
            TArray<int32> Candidates;
            for (int32 EdgeIndex = 0; EdgeIndex < Children.Num(); ++EdgeIndex)
                if (Children[EdgeIndex].Evaluate(Context, { this }))
                    Candidates.Add(EdgeIndex);
 
            // No candidates :(
            if (Candidates.Num() == 0)
                break;
 
            // Select Random
            const int32 SelectedIndex = FMath::RandHelper(Candidates.Num());
            const int32 TargetNodeIndex = Children[Candidates[SelectedIndex]].TargetIndex;
            return Context.EnterNode(TargetNodeIndex, NodesEnteredWithThisStep);
        }
 
        default:
            checkNoEntry();
    }
 
    FDlgLogger::Get().Errorf(
        TEXT("HandleNodeEnter - selector node entered, no satisfied child.\nContext:\n\t%s"),
        *Context.GetContextString()
    );
    return false;
}