// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.

#pragma once

#include "CollectionManagerTypes.h"

/**
 * 
 */
class SReferenceViewer : public SCompoundWidget
{
public:
	SLATE_BEGIN_ARGS( SReferenceViewer ){}

	SLATE_END_ARGS()

	~SReferenceViewer();

	/** Constructs this widget with InArgs */
	void Construct( const FArguments& InArgs );

	/** Sets a new root package name */
	void SetGraphRootPackageNames(const TArray<FName>& NewGraphRootPackageNames);

	// SWidget implementation
	virtual void Tick(const FGeometry& AllottedGeometry, const double InCurrentTime, const float InDeltaTime) override;
	// End SWidget implementation

private:

	void OnNodeDoubleClicked(class UEdGraphNode* Node);

	/** True if the user may use the history back button */
	bool IsBackEnabled() const;

	/** True if the user may use the history forward button */
	bool IsForwardEnabled() const;

	/** Handler for clicking the history back button */
	FReply BackClicked();

	/** Handler for clicking the history forward button */
	FReply ForwardClicked();

	/** Handler for when the graph panel tells us to go back in history (like using the mouse thumb button) */
	void GraphNavigateHistoryBack();

	/** Handler for when the graph panel tells us to go forward in history (like using the mouse thumb button) */
	void GraphNavigateHistoryForward();

	/** Gets the tool tip text for the history back button */
	FString GetHistoryBackTooltip() const;

	/** Gets the tool tip text for the history forward button */
	FString GetHistoryForwardTooltip() const;

	/** Gets the text to be displayed in the address bar */
	FText GetAddressBarText() const;

	void OnApplyHistoryData(const FReferenceViewerHistoryData& History);

	void OnUpdateHistoryData(FReferenceViewerHistoryData& HistoryData) const;
	
	void OnSearchDepthEnabledChanged( ESlateCheckBoxState::Type NewState );
	ESlateCheckBoxState::Type IsSearchDepthEnabledChecked() const;
	int32 GetSearchDepthCount() const;
	void OnSearchDepthCommitted(int32 NewValue);

	void OnSearchBreadthEnabledChanged( ESlateCheckBoxState::Type NewState );
	ESlateCheckBoxState::Type IsSearchBreadthEnabledChecked() const;
	int32 GetSearchBreadthCount() const;
	void OnSearchBreadthCommitted(int32 NewValue);

	void RegisterActions();
	void ShowSelectionInContentBrowser();
	void OpenSelectedInAssetEditor();
	void ReCenterGraph();
	void ListReferencedObjects();
	void ListObjectsThatReference();
	void MakeCollectionWithReferencedAssets(ECollectionShareType::Type ShareType);
	void ShowReferenceTree();

	void ReCenterGraphOnNodes(const TSet<UObject*>& Nodes);

	UObject* GetObjectFromSingleSelectedNode() const;
	bool HasExactlyOneNodeSelected() const;
	bool IsSingleSelectedItemValidObject() const;

	void OnInitialAssetRegistrySearchComplete();
private:

	/** The manager that keeps track of history data for this browser */
	FReferenceViewerHistoryManager HistoryManager;

	TSharedPtr<SGraphEditor> GraphEditorPtr;

	TSharedPtr<FUICommandList> ReferenceViewerActions;

	UEdGraph_ReferenceViewer* GraphObj;
};