EnemyCombatSubsystem.h

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#pragma once
 
#include "Engine/TimerHandle.h"
#include "Subsystems/WorldSubsystem.h"
#include "EnemyCombatSubsystem.generated.h"
 
class AActor;
 
USTRUCT()
struct FEnemyAttackTokenCandidate
{
    GENERATED_BODY()
 
    UPROPERTY(Transient)
    TWeakObjectPtr<AActor> Requester;
 
    UPROPERTY(Transient)
    TWeakObjectPtr<AActor> TargetActor;
 
    UPROPERTY(Transient)
    float FirstRequestTime = 0.0f;
 
    UPROPERTY(Transient)
    float LastRequestTime = 0.0f;
};
 
USTRUCT()
struct FEnemyAttackTokenHistory
{
    GENERATED_BODY()
 
    UPROPERTY(Transient)
    TWeakObjectPtr<AActor> Requester;
 
    UPROPERTY(Transient)
    float LastReleaseTime = 0.0f;
};
 
UCLASS()
class CK_UE_API UEnemyCombatSubsystem : public UWorldSubsystem
{
    GENERATED_BODY()
 
public:
    virtual void Deinitialize() override;
 
    bool RequestAttackToken(AActor* TargetActor, AActor* Requester);
    void ReleaseAttackToken(AActor* Requester);
    void UnregisterAttackTokenActor(AActor* Requester);
 
private:
    bool HasAttackToken(const AActor* Requester) const;
    bool RemoveAttackTokenHolder(AActor* Requester);
 
    void CompactTokenData(float CurrentTime);
    FEnemyAttackTokenCandidate& FindOrAddCandidate(AActor* TargetActor, AActor* Requester, float CurrentTime);
    FEnemyAttackTokenHistory& FindOrAddHistory(AActor* Requester);
    const FEnemyAttackTokenHistory* FindHistory(const AActor* Requester) const;
 
#pragma region Score
    void TryGrantAttackTokens(float CurrentTime);
    float CalculateCandidateScore(const FEnemyAttackTokenCandidate& Candidate, float CurrentTime) const;
#pragma endregion Score
 
#pragma region Debug
    void RefreshDebugTimer();
    bool HasDebugTokenData() const;
    void DrawCombatTokenDebug();
    void DrawTokenDebugString(AActor* TargetActor, const FString& Text, const FColor& Color) const;
#pragma endregion Debug
 
private:
    UPROPERTY(Transient)
    TArray<TWeakObjectPtr<AActor>> TokenHolders;
 
    UPROPERTY(Transient)
    TArray<FEnemyAttackTokenCandidate> TokenCandidates;
 
    UPROPERTY(Transient)
    TArray<FEnemyAttackTokenHistory> TokenHistories;
 
    FTimerHandle DebugTimerHandle;
};