// 

#pragma once

#include "CoreMinimal.h"
#include "CommonUserWidget.h"
#include "GIS_InventoryMeesages.h"
#include "GIS_ItemInfo.h"
#include "ItemData.h"

#include "UI/Common/GUIS_UserWidgetInterface.h"
#include "ItemStackContainer.generated.h"

class UCommonTabListWidgetBase;
class UGIS_AsyncAction_WaitInventorySystem;
class UListView;
class IItemFilterInterface;
/**
 * 
 */
DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FItemSelectionOrHoveredChanged,UItemData*,SelectedItemData,bool,bSelected);

DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FItemClickedEvent,UItemData*,ClickedItemData);
DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FItemEntryGeneratedEvent,UUserWidget*,Widget);

UCLASS()
class PHYINVENTORY_API UItemStackContainer : public UCommonUserWidget,public IGUIS_UserWidgetInterface
{
	GENERATED_BODY()
	
protected:
	//~ Begin IGUIS_UserWidgetInterface Interface
	virtual void SetOwningActor_Implementation(AActor* NewOwningActor) override;
	virtual void OnDeactivated_Implementation() override;
	virtual void OnActivated_Implementation() override;
	virtual AActor* GetOwningActor_Implementation() override;
	//~ End IGUIS_UserWidgetInterface Interface
public:
	// 添加过滤器对象
	void AddFilterObject(UObject* InFilterObject);
	// 移除过滤器对象
	void RemoveFilterObject(UObject* InFilterObject);
	UPROPERTY(BlueprintAssignable)
	FItemSelectionOrHoveredChanged OnItemSelectionChanged;
	UPROPERTY(BlueprintAssignable)
	FItemSelectionOrHoveredChanged OnItemHoveredChanged;
	UPROPERTY(BlueprintAssignable)
	FItemClickedEvent OnItemClicked;
	UPROPERTY(BlueprintAssignable)
	FItemEntryGeneratedEvent OnItemEntryGenerated;
	UPROPERTY(BlueprintAssignable)
	FItemClickedEvent OnItemDoubleClicked;
	UPROPERTY()
	UGIS_AsyncAction_WaitInventorySystem* WaitInventorySystem;
	void SetSelectedIndexForNewItem(const int32 NewSelectedIndex);
	// 交换两个item data槽位
	bool SwapItemDataSlots(const int32 IndexA,const int32 IndexB);
	bool SwapItemDataToOtherContainer(const int32 SourceIndex,UItemStackContainer* TargetContainer,const int32 TargetIndex);
	// 检查是否可以移动item
	virtual bool CanMoveItem(const int32 IndexA,UItemStackContainer* TargetContainer,const int32 IndexB);
	// 是否允许拖拽操作
	UFUNCTION(BlueprintImplementableEvent,BlueprintPure,BlueprintCallable)
	bool IsDraggingAllowed() const;
	FORCEINLINE bool IsItemActionAllowed() const { return bAllowItemAction; }
	int32 FindItemSlotIndex(const UItemData* InItemData) const;
	FORCEINLINE TArray<TObjectPtr<UItemData>> GetItemDataArray() const { return ItemDataArray; }
	// 同步item data数组到listview
	void SyncItemDataToListView();
	// 用来拖拽操作时记录上一次放下的item index
	int32 LastDropIndex = INDEX_NONE;
private:
	TWeakObjectPtr<AActor> OwningActor;
	TWeakObjectPtr<UGIS_InventorySystemComponent> InventorySystemComponent;
	// 配置
	UPROPERTY(EditAnywhere,Category="Config|ItemStackContainer")
	FGameplayTag CollectionToTrackTag;
	// Item所有tag过滤器映射表,可以通过name来过滤Item,用于tab切换等功能
	UPROPERTY(EditAnywhere,Category="Config|Filter")
	TMap<FName,FGameplayTagQuery> ItemFilterMap;
	// 要过滤的Item名称
	UPROPERTY(EditAnywhere,Category="Config|Filter")
	FName ItemFilterName;
	UPROPERTY(EditAnywhere,Category="Config")
	bool bAllowItemAction = true;
	UPROPERTY(EditAnywhere,Category="Config")
	bool bCreateDefaultItemDataSlots = true;
	UPROPERTY(EditAnywhere,Category="Config",meta=(EditCondition="bCreateDefaultItemDataSlots"))
	int32 DefaultItemDataSlotCount = 20;
	UPROPERTY()
	TArray<UObject*> ItemFilterObjects;
	// 容器用来展示item的listview
	UPROPERTY(BlueprintReadOnly,meta=(AllowPrivateAccess="true"))
	TObjectPtr<UListView> ItemListView;
	UPROPERTY()
	TObjectPtr<UCommonTabListWidgetBase> FilterTabsReference;
	// 当前容器中关联的item数据
	UPROPERTY()
	TArray<TObjectPtr<UItemData>> ItemDataArray;
	
	// The item stack data
	// 给指定槽位的ItemData赋值
	void AssignItemInfoToItemData(const FGIS_ItemInfo& InInfo,const int32 SlotIndex);
	void UnassignItemInfoToItemData(const FGIS_ItemInfo& InInfo);
	int32 FindItemIndexFromDataByStackID(const FGuid& StackID) const;
	
	// 从库存系统获取数据
	TArray<FGIS_ItemInfo> GetItemInfoArrayFromInventorySystem();
	// 重置item data数组
	void ResetItemDataArray();
	// 设置或添加item info到item data数组
	void SetOrAddItemInfoToItemDataArray(const FGIS_ItemInfo& InInfo,const int32 SlotIndex);
	// 同步item infos到item data数组
	void SyncItemInfoToItemDataArray(const TArray<FGIS_ItemInfo>& InItemInfos);
	
	// 为新物品查找合适的item data槽位
	int32 FindSuitableItemDataSlotForNewItem();
	// 聚合函数，同步所有数据
	void SyncAll();
public:
	// 必须配置filter map才能使用
	void ApplyFilter(const FName& InFilterName);
private:
	void HandleItemSelectionChanged(UObject* Object) const;
	void HandleItemHoveredChanged(UObject* Object, bool bIsHovered) const;
	void HandleItemClicked(UObject* Object) const;
	void HandleListViewEntryWidgetGenerated(UUserWidget& UserWidget) const;
	void HandleItemDoubleClicked(UObject* Object) const;
	void RegisterListViewEvents();
	void UnregisterListViewEvents() const;
	FDelegateHandle ItemSelectionChangedHandle;
	FDelegateHandle ItemHoveredChangedHandle;
	FDelegateHandle ItemClickedHandle;
	FDelegateHandle ListViewEntryWidgetGeneratedHandle;
	FDelegateHandle ItemDoubleClickedHandle;
	int32 SelectedIndexForNewItem = INDEX_NONE;
	
	// 处理库存系统的item堆栈变化消息
	UFUNCTION()
	void HandleInventoryStackChanged(const FGIS_InventoryStackUpdateMessage& Message);
	UFUNCTION()
	void HandleTabSelected(FName TabId);
	UFUNCTION()
	void HandleInventorySystemInitialized();
	// 创建默认的item data槽位
	void CreateDefaultItemDataSlots();
};