Rotten Bloom

DECLARE_MULTICAST_DELEGATE_OneParam(FOnHitDetected, const FHitResult&);
DECLARE_MULTICAST_DELEGATE(FOnAttackStarted);

UCLASS(ClassGroup=(Custom), meta=(BlueprintSpawnableComponent))
class PLANTFORMER_API UAttackComponent : public UActorComponent
{
	GENERATED_BODY()

public:
	// Delegates
	FOnAttackStarted OnAttackStarted;
	FOnHitDetected OnHitDetected;
	
	EAttackState AttackState = EAttackState::Idle;
	
private:
	UPROPERTY()
	FVector _startPoint;
	
	UPROPERTY(EditAnywhere, meta=(ToolTip = "Offset of the hitbox center"), Category = "Attack")
	FAttackOffset _attackOffset;
	
	UPROPERTY(EditAnywhere, meta=(ToolTip = "Range of the attack"), Category = "Attack")
	float _attackRange { 1.f };
	
	UPROPERTY(EditAnywhere, meta=(ToolTip = "Size of the attack box"), Category = "Attack")
	FVector _hitboxExtent { FVector(15.f, 15.f, 15.f) };
	
	UPROPERTY(EditAnywhere,
		meta=(ToolTip = "The speed of the attack", ClampMin = "1.0", ClampMax = "5.0", UIMin = "1.0", UIMax = "5.0"),
		Category = "Attack")
	float _attackSpeed { 2.0f };
	
	UPROPERTY(EditDefaultsOnly, Category = "Attack",
		meta=(ToolTip = "Time window after an attack to chain the next combo hit"))
	float _comboResetDelay { 0.4f };
	
	UPROPERTY()
	int32 _comboIndex { 0 };
	
	UPROPERTY(EditAnywhere, meta=(ToolTip = "Max attack combo"), Category = "Attack")
	int32 _maxComboIndex { 4 };
	
	UPROPERTY(EditAnywhere,
		meta=(ToolTip = "Cooldown after exhausting the full combo", ClampMin = "0.5", ClampMax = "5.0", UIMin = "0.5", UIMax = "5.0"),
		Category = "Attack")
	float _comboCooldown { 2.0f };
	
	UPROPERTY(VisibleAnywhere, meta=(ToolTip = "When does the player can attack again"), Category = "Attack")
	float _nextAttackTime { 0.0f };
	
	UPROPERTY(VisibleAnywhere, meta=(ToolTip = "Whether the player can attack or not"), Category = "Attack")
	bool _bCanAttack { true };
	
	UPROPERTY(EditAnywhere, meta=(ToolTip = "Collision channel to detect the target"), Category = "Attack")
	TEnumAsByte<ECollisionChannel> _collisionChannel { ECC_Pawn };
	
	bool _bIsTracing { false };
	
	FTimerHandle _comboResetTimer;
	
	//Hitbox Properties ------------------------------------------------------------------------------------------------
	
	// We select the Object Types we want to hit using a collision channel
	TArray<TEnumAsByte<EObjectTypeQuery>> _objectTypes;
	// Actors that were hit by the trace
	TArray<FHitResult> _hitResults;
	// Actors that were already hit during the current attack, to avoid hitting them multiple times
	TArray<TObjectPtr<AActor>> _alreadyHitActors;
	// Actors to ignore in general
	TArray<TObjectPtr<AActor>> _ignoreActors;
	
public:
    UAttackComponent();
    
    bool HandleAttackInput();
	bool StartAttack();
	void ResetAttack();
	void OnAttackAnimationEnded();
	
	void SetTracing(bool bActive);
	void PerformTrace();
	bool IsComboActive() const;
	
private:
	bool IsHitActorImmune(AActor* HitActor);
	void ResetComboIndex();