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

#pragma once

#include "IDocumentation.h"
#include "IDocumentationPage.h"
#include "EditorTutorial.h"

/**
 * The widget which displays 'floating' content 
 */
class STutorialContent : public SCompoundWidget
{
	SLATE_BEGIN_ARGS( STutorialContent )
	{
		_Visibility = EVisibility::SelfHitTestInvisible;
		_IsStandalone = false;
	}

	/** Alignment of content relative to widget, note "Fill" is not supported */
	SLATE_ATTRIBUTE(EVerticalAlignment, VAlign)

	/** Alignment of content relative to widget, note "Fill" is not supported */
	SLATE_ATTRIBUTE(EHorizontalAlignment, HAlign)

	/** Offset form the widget we annotate */
	SLATE_ATTRIBUTE(FVector2D, Offset)

	/** Whether this a standalone widget (with its own close button) or part of a group of other widgets, paired with tutorial navigation */
	SLATE_ARGUMENT(bool, IsStandalone)

	/** Delegate fired when the close button is clicked */
	SLATE_ARGUMENT(FSimpleDelegate, OnClosed)

	/** Where text should be wrapped */
	SLATE_ARGUMENT(float, WrapTextAt)

	/** Anchor if required */
	SLATE_ARGUMENT(FTutorialContentAnchor, Anchor)

	SLATE_END_ARGS()

	void Construct(const FArguments& InArgs, const FTutorialContent& InContent);

	/** SWidget implementation */
	virtual int32 OnPaint( const FPaintArgs& Args, const FGeometry& AllottedGeometry, const FSlateRect& MyClippingRect, FSlateWindowElementList& OutDrawElements, int32 LayerId, const FWidgetStyle& InWidgetStyle, bool bParentEnabled ) const override;

	/** Helper function to generate widgets from an FTutorialContent struct */
	static TSharedRef<SWidget> GenerateContentWidget(const FTutorialContent& InContent, float WrapTextAt, bool bForWidget, TSharedPtr<IDocumentationPage>& OutDocumentationPage);

	/** Handle repositioning the widget */
	FVector2D GetPosition() const;

	/** Handle resizing the widget */
	FVector2D GetSize() const;

	/** Delegate handler called back from the overlay paint routines to flag whether we should paint as well (i.e. if this widget content is highlighted for the current stage) */
	void HandlePaintNamedWidget(TSharedRef<SWidget> InWidget, const FGeometry& InGeometry);

	/** Called back from the overlay paint routines to reset the flag we check for painting with */
	void HandleResetNamedWidget();

	/** Handle caching window size - called back from overlay paint routine */
	void HandleCacheWindowSize(const FVector2D& InWindowSize);

private:

	/** Get the visibility of this content */
	EVisibility GetVisibility() const;

	/** Handle close button clicked - forward to delegate */
	FReply OnCloseButtonClicked();

	/** Get close button visibility - varies depending on whether we are standalone or not */
	EVisibility GetCloseButtonVisibility() const;

	/** Copy of the window size we were last draw at */
	FVector2D CachedWindowSize;

	/** Copy of the geometry our widget was last drawn with */
	FGeometry CachedGeometry;

	/** Container for widget content */
	TSharedPtr<SWidget> ContentWidget;

	/** Alignment of content relative to widget, note "Fill" is not supported */
	TAttribute<EVerticalAlignment> VerticalAlignment;

	/** Alignment of content relative to widget, note "Fill" is not supported */
	TAttribute<EHorizontalAlignment> HorizontalAlignment;

	/** Offset form the widget we annotate */
	TAttribute<FVector2D> WidgetOffset;

	/** Copy of the anchor for this tutorial content */
	FTutorialContentAnchor Anchor; 

	/** Whether this a standalone widget (with its own close button) or part of a group of other widgets, paired with tutorial navigation */
	bool bIsStandalone;

	/** Whether this overlay is currently visible */
	bool bIsVisible;

	/** Delegate fired when the close button is clicked */
	FSimpleDelegate OnClosed;

	/** Animation curves for displaying border */
	FCurveSequence BorderPulseAnimation;
	FCurveSequence BorderIntroAnimation;

	/** Documentation page reference to use if we are displaying a UDN doc - we need this otherwise the page will be freed */
	TSharedPtr<IDocumentationPage> DocumentationPage;
};