// © 2024 Long Ly. All rights reserved. Any unauthorized use, reproduction, or distribution of this trademark is strictly prohibited and may result in legal action.

#pragma once

#include "CoreMinimal.h"
#include "Camera/CameraComponent.h"
#include "GameplayTagContainer.h"
#include "OLSCameraComponent.generated.h"


DECLARE_DELEGATE_RetVal(TSubclassOf<class UOLSCameraMode>, FOLSCameraModeDelegate);

/**
 *	UOLSCameraComponent
 *
 *	The base camera component class used by this project.
 */
UCLASS()
class OLS_API UOLSCameraComponent : public UCameraComponent
{
	GENERATED_BODY()

public:

	UOLSCameraComponent(const FObjectInitializer& objectInitializer);

	// Returns the camera component if one exists on the specified actor.
	UFUNCTION(BlueprintPure, Category = "OLS|Camera")
	static UOLSCameraComponent* FindCameraComponent(const AActor* Actor);

	// Returns the target actor that the camera is looking at.
	virtual AActor* GetTargetActor() const;

	// Delegate used to query for the best camera mode.
	FOLSCameraModeDelegate DetermineCameraModeDelegate;

	// Add an offset to the field of view.  The offset is only for one frame, it gets cleared once it is applied.
	void AddFieldOfViewOffset(float FovOffset);

	virtual void DrawDebug(UCanvas* canvas) const;

	// Gets the tag associated with the top layer and the blend weight of it
	void GetBlendInfo(float& outWeightOfTopLayer, FGameplayTag& outTagOfTopLayer) const;

protected:

	virtual void OnRegister() override;
	virtual void GetCameraView(float deltaTime, FMinimalViewInfo& desiredView) override;

	virtual void UpdateCameraModes();

protected:

	// Stack used to blend the camera modes.
	UPROPERTY()
	TObjectPtr<class UOLSCameraModeStack> CameraModeStack = nullptr;

	// Offset applied to the field of view.  The offset is only for one frame, it gets cleared once it is applied.
	float FieldOfViewOffset = 0.0f;

};