// © 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 "AbilitySystemComponent.h"
#include "NativeGameplayTags.h"
#include "OLSAttributeSetBase.h"
#include "OLSHealthAttributeSet.generated.h"

OLS_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(TAG_Gameplay_Damage);
OLS_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(TAG_Gameplay_DamageImmunity);
OLS_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(TAG_Gameplay_DamageSelfDestruct);
OLS_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(TAG_Gameplay_FellOutOfWorld);
OLS_API UE_DECLARE_GAMEPLAY_TAG_EXTERN(TAG_OLS_Damage_Message);

/**
 *	UOLSHealthAttributeSet
 *
 *	Class that defines attributes that are necessary for taking damage.
 *	Attribute examples include: health, shields, and resistances.
 */
UCLASS(BlueprintType)
class OLS_API UOLSHealthAttributeSet : public UOLSAttributeSetBase
{
	GENERATED_BODY()

public:

	UOLSHealthAttributeSet();

	//~ Begin UObject interface.
	virtual void GetLifetimeReplicatedProps(TArray<FLifetimeProperty>& OutLifetimeProps) const override;
	//~ End UObject interface.

	ATTRIBUTE_ACCESSORS(ThisClass, Health);
	ATTRIBUTE_ACCESSORS(ThisClass, MaxHealth);
	ATTRIBUTE_ACCESSORS(ThisClass, Healing);
	ATTRIBUTE_ACCESSORS(ThisClass, Damage);

	// Delegate when health changes due to damage/healing, some information may be missing on the client
	mutable FOLSAttributeEventNativeDelegate OnHealthChanged;

	// Delegate when max health changes
	mutable FOLSAttributeEventNativeDelegate OnMaxHealthChanged;

	// Delegate to broadcast when the health attribute reaches zero
	mutable FOLSAttributeEventNativeDelegate OnOutOfHealth;

protected:

	UFUNCTION()
	void OnRep_Health(const FGameplayAttributeData& oldValue);

	UFUNCTION()
	void OnRep_MaxHealth(const FGameplayAttributeData& OldValue);

	virtual bool PreGameplayEffectExecute(FGameplayEffectModCallbackData& data) override;
	virtual void PostGameplayEffectExecute(const FGameplayEffectModCallbackData& Data) override;

	virtual void PreAttributeBaseChange(const FGameplayAttribute& attribute, float& newValue) const override;
	virtual void PreAttributeChange(const FGameplayAttribute& attribute, float& newValue) override;
	virtual void PostAttributeChange(const FGameplayAttribute& attribute, float oldValue, float newValue) override;

	void ClampAttribute(const FGameplayAttribute& attribute, float& outNewValue) const;

private:


	// The current health attribute.  The health will be capped by the max health attribute.  Health is hidden from modifiers so only executions can modify it.
	UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_Health, Category = "OLS|Health", Meta = (HideFromModifiers, AllowPrivateAccess = true))
	FGameplayAttributeData Health;

	// The current max health attribute.  Max health is an attribute since gameplay effects can modify it.
	UPROPERTY(BlueprintReadOnly, ReplicatedUsing = OnRep_MaxHealth, Category = "OLS|Health", Meta = (AllowPrivateAccess = true))
	FGameplayAttributeData MaxHealth;

	// Used to track when the health reaches 0.
	uint8 bIsOutOfHealth : 1 = false;

	// Store the health before any changes 
	float MaxHealthBeforeAttributeChange = 0.f;
	float HealthBeforeAttributeChange = 0.f
	;
	// -------------------------------------------------------------------
	//	Meta Attribute (please keep attributes that aren't 'stateful' below 
	// -------------------------------------------------------------------

	// Incoming healing. This is mapped directly to +Health
	UPROPERTY(BlueprintReadOnly, Category="Lyra|Health", Meta=(AllowPrivateAccess=true))
	FGameplayAttributeData Healing;

	// Incoming damage. This is mapped directly to -Health
	UPROPERTY(BlueprintReadOnly, Category="Lyra|Health", Meta=(HideFromModifiers, AllowPrivateAccess=true))
	FGameplayAttributeData Damage;
};