// Copyright Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CoreMinimal.h"
#include "CoreUObject.h"
#include "Kismet/BlueprintFunctionLibrary.h"
#include "LyraInventoryItemDefinition.generated.h"

class ULyraInventoryItemInstance;

//////////////////////////////////////////////////////////////////////

// Represents a fragment of an item definition
UCLASS(DefaultToInstanced, EditInlineNew, Abstract)
class ULyraInventoryItemFragment : public UObject
{
	GENERATED_BODY()

public:
	virtual void OnInstanceCreated(ULyraInventoryItemInstance* Instance) const {}
};

//////////////////////////////////////////////////////////////////////

/**
 * ULyraInventoryItemDefinition
 */
UCLASS(Blueprintable, Const, Abstract)
class ULyraInventoryItemDefinition : public UObject
{
	GENERATED_BODY()

public:
	ULyraInventoryItemDefinition(const FObjectInitializer& ObjectInitializer = FObjectInitializer::Get());

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category=Display)
	FText DisplayName;

	UPROPERTY(EditDefaultsOnly, BlueprintReadOnly, Category=Display, Instanced)
	TArray<TObjectPtr<ULyraInventoryItemFragment>> Fragments;

public:
	const ULyraInventoryItemFragment* FindFragmentByClass(TSubclassOf<ULyraInventoryItemFragment> FragmentClass) const;
};

//@TODO: Make into a subsystem instead?
UCLASS()
class ULyraInventoryFunctionLibrary : public UBlueprintFunctionLibrary
{
	GENERATED_BODY()

	UFUNCTION(BlueprintCallable, meta=(DeterminesOutputType=FragmentClass))
	static const ULyraInventoryItemFragment* FindItemDefinitionFragment(TSubclassOf<ULyraInventoryItemDefinition> ItemDef, TSubclassOf<ULyraInventoryItemFragment> FragmentClass);
};