From f84a711b4fddfaaab37e1e3a7aaa469a4649f97e Mon Sep 17 00:00:00 2001
From: Caleb Buhungiro <caleb.buhungiro@finology-group.com>
Date: Sun, 14 Sep 2025 23:22:37 +0800
Subject: [PATCH] setup AI Perception and forgatting behavior from Blackboard

---
 Config/DefaultEngine.ini                   |  3 +++
 Content/Maps/GameLevel.umap                |  2 +-
 Source/Crunch/Private/AI/CAIController.cpp | 31 ++++++++++++++++------
 Source/Crunch/Public/AI/CAIController.h    |  3 +++
 4 files changed, 30 insertions(+), 9 deletions(-)

diff --git a/Config/DefaultEngine.ini b/Config/DefaultEngine.ini
index 2d98a8d..6d7e948 100644
--- a/Config/DefaultEngine.ini
+++ b/Config/DefaultEngine.ini
@@ -102,3 +102,6 @@ CategorySlot7=Seven
 CategorySlot8=Eight
 CategorySlot9=Nine
 
+[/Script/AIModule.AISystem]
+bForgetStaleActors=True
+
diff --git a/Content/Maps/GameLevel.umap b/Content/Maps/GameLevel.umap
index 7032e57..5f34360 100644
--- a/Content/Maps/GameLevel.umap
+++ b/Content/Maps/GameLevel.umap
@@ -1,3 +1,3 @@
 version https://git-lfs.github.com/spec/v1
-oid sha256:02ccadf71b7c79c2b6749152d7e3e259b8d622bf327cdbb19e6727d8b719cd20
+oid sha256:e38df942e70c04976ec4fdfbc60ee8437d3460fe94e3b9e623499234fdabbbff
 size 15358735
diff --git a/Source/Crunch/Private/AI/CAIController.cpp b/Source/Crunch/Private/AI/CAIController.cpp
index 4f12204..9523d34 100644
--- a/Source/Crunch/Private/AI/CAIController.cpp
+++ b/Source/Crunch/Private/AI/CAIController.cpp
@@ -26,6 +26,7 @@ ACAIController::ACAIController()
 
 	AIPerceptionComponent->ConfigureSense(*SightConfig);
 	AIPerceptionComponent->OnTargetPerceptionUpdated.AddDynamic(this, &ThisClass::TargetPerceptionUpdated);
+	AIPerceptionComponent->OnTargetPerceptionForgotten.AddDynamic(this, &ACAIController::TargetForgotten);
 }
 
 void ACAIController::OnPossess(APawn* InPawn)
@@ -52,18 +53,22 @@ void ACAIController::Tick(float DeltaTime)
 
 void ACAIController::TargetPerceptionUpdated(AActor* TargetActor, FAIStimulus Stimulus)
 {
-	UE_LOG(LogTemp, Warning, TEXT("Saw you"))
-	// GEngine->AddOnScreenDebugMessage(
-	// 	-1, 12.f, FColor::Blue,
-	// 	FString::Printf(TEXT("saw you")));
-	
 	if (Stimulus.WasSuccessfullySensed())
 	{
 		if (!GetCurrentTarget()) SetCurrentTarget(TargetActor);
 	}
 	else
 	{
-		if (GetCurrentTarget() == TargetActor) SetCurrentTarget(nullptr);
+	}
+}
+
+void ACAIController::TargetForgotten(AActor* ForgottenActor)
+{
+	if (!ForgottenActor) return;
+
+	if (GetCurrentTarget() == ForgottenActor)
+	{
+		SetCurrentTarget(GetNextPerceivedActor());
 	}
 }
 
@@ -71,8 +76,7 @@ const UObject* ACAIController::GetCurrentTarget() const
 {
 	if (const auto BlackboardComponent{GetBlackboardComponent()})
 	{
-		const auto Target{BlackboardComponent->GetValueAsObject(BlackboardTargetName)};
-		return Target;
+		return BlackboardComponent->GetValueAsObject(BlackboardTargetName);
 	}
 	return nullptr;
 }
@@ -85,3 +89,14 @@ void ACAIController::SetCurrentTarget(AActor* NewTarget)
 	if (NewTarget) BlackboardComponent->SetValueAsObject(BlackboardTargetName, NewTarget);
 	else BlackboardComponent->ClearValue(BlackboardTargetName);
 }
+
+AActor* ACAIController::GetNextPerceivedActor() const
+{
+	if (PerceptionComponent)
+	{
+		TArray<AActor*> Actors;
+		AIPerceptionComponent->GetPerceivedHostileActors(Actors);
+		if (Actors.Num() != 0) return Actors[0];
+	}
+	return nullptr;
+}
diff --git a/Source/Crunch/Public/AI/CAIController.h b/Source/Crunch/Public/AI/CAIController.h
index a0d4b9b..8d203f9 100644
--- a/Source/Crunch/Public/AI/CAIController.h
+++ b/Source/Crunch/Public/AI/CAIController.h
@@ -28,6 +28,8 @@ private:
 	FName BlackboardTargetName {"Target"};
 	UFUNCTION()
 	void TargetPerceptionUpdated(AActor* TargetActor, FAIStimulus Stimulus);
+	UFUNCTION()
+	void TargetForgotten(AActor* ForgottenActor);
 	
 	UPROPERTY(EditDefaultsOnly, Category="AI Behavior")
 	UBehaviorTree* BehaviorTree;
@@ -40,4 +42,5 @@ private:
 	UFUNCTION()
 	const UObject* GetCurrentTarget() const ;
 	void SetCurrentTarget(AActor* NewTarget);
+	AActor * GetNextPerceivedActor() const;
 };