// Copyright (c) 2026 Reignance Studios. MIT License, see LICENSE.

#pragma once

#include "CoreMinimal.h"
#include "Engine/CancellableAsyncAction.h"
#include "AttributeSet.h"
#include "GameplayEffectTypes.h"
#include "RSAsyncWatchAttribute.generated.h"

class UAbilitySystemComponent;

DECLARE_DYNAMIC_MULTICAST_DELEGATE_ThreeParams(FRSAttributeChanged, FGameplayAttribute, Attribute, float, NewValue, float, OldValue);

/**
 * Watches one or more attributes and fires OnChanged when any of them changes.
 * Fires once right away with the current value, so a widget can bind in
 * Construct and never poll in Tick. Works on clients: attribute replication
 * runs the same change delegate.
 *
 * Call Cancel (or let the widget's Destruct call it) to unbind.
 */
UCLASS(meta = (ExposedAsyncProxy = "AsyncTask"))
class RSGASHELPERS_API URSAsyncWatchAttribute : public UCancellableAsyncAction
{
	GENERATED_BODY()

public:
	UPROPERTY(BlueprintAssignable)
	FRSAttributeChanged OnChanged;

	/** Watch attributes on the actor's ASC (PlayerState setups included). */
	UFUNCTION(BlueprintCallable, Category = "RS|GAS", meta = (BlueprintInternalUseOnly = "true", DefaultToSelf = "Actor"))
	static URSAsyncWatchAttribute* WatchAttributes(AActor* Actor, const TArray<FGameplayAttribute>& Attributes, bool bFireInitialValue = true);

	virtual void Activate() override;
	virtual void Cancel() override;

private:
	void HandleChange(const FOnAttributeChangeData& Data);

	TWeakObjectPtr<UAbilitySystemComponent> WeakASC;
	TArray<FGameplayAttribute> Watched;
	TArray<TPair<FGameplayAttribute, FDelegateHandle>> Bindings;
	bool bFireInitial = true;
};