// Copyright 1998-2017 Epic Games, Inc. All Rights Reserved.

#include "TimespanStructCustomization.h"
#include "Widgets/DeclarativeSyntaxSupport.h"
#include "Engine/GameViewportClient.h"
#include "PropertyHandle.h"
#include "Widgets/Input/SEditableTextBox.h"
#include "DetailWidgetRow.h"


#define LOCTEXT_NAMESPACE "TimespanStructCustomization"


/* IDetailCustomization interface
 *****************************************************************************/

void FTimespanStructCustomization::CustomizeChildren( TSharedRef<IPropertyHandle> StructPropertyHandle, class IDetailChildrenBuilder& StructBuilder, IPropertyTypeCustomizationUtils& StructCustomizationUtils )
{
	/* do nothing */
}


void FTimespanStructCustomization::CustomizeHeader( TSharedRef<IPropertyHandle> StructPropertyHandle, class FDetailWidgetRow& HeaderRow, IPropertyTypeCustomizationUtils& StructCustomizationUtils )
{
	PropertyHandle = StructPropertyHandle;

	HeaderRow
		.NameContent()
		[
			StructPropertyHandle->CreatePropertyNameWidget()
		]
		.ValueContent()
		.MaxDesiredWidth(0.0f)
		.MinDesiredWidth(125.0f)
		[
			SNew(SEditableTextBox)
				.ClearKeyboardFocusOnCommit(false)
				.IsEnabled(!PropertyHandle->IsEditConst())
				.ForegroundColor(this, &FTimespanStructCustomization::HandleTextBoxForegroundColor)
				.OnTextChanged(this, &FTimespanStructCustomization::HandleTextBoxTextChanged)
				.OnTextCommitted(this, &FTimespanStructCustomization::HandleTextBoxTextCommited)
				.SelectAllTextOnCommit(true)
				.Font( IPropertyTypeCustomizationUtils::GetRegularFont() )
				.Text(this, &FTimespanStructCustomization::HandleTextBoxText)
		];
}


/* FTimespanStructCustomization callbacks
 *****************************************************************************/

FSlateColor FTimespanStructCustomization::HandleTextBoxForegroundColor( ) const
{
	if (InputValid)
	{
		static const FName InvertedForegroundName("InvertedForeground");
		return FEditorStyle::GetSlateColor(InvertedForegroundName);
	}

	return FLinearColor::Red;
}


FText FTimespanStructCustomization::HandleTextBoxText( ) const
{
	TArray<void*> RawData;
	PropertyHandle->AccessRawData(RawData);
	
	if (RawData.Num() != 1)
	{
		return LOCTEXT("MultipleValues", "Multiple Values");
	}
	else if( RawData[0] == nullptr )
	{
		return FText::GetEmpty();
	}
	else
	{
		return FText::FromString(((FTimespan*)RawData[0])->ToString());
	}
}


void FTimespanStructCustomization::HandleTextBoxTextChanged( const FText& NewText )
{
	FTimespan Timespan;
	InputValid = FTimespan::Parse(NewText.ToString(), Timespan);
}


void FTimespanStructCustomization::HandleTextBoxTextCommited( const FText& NewText, ETextCommit::Type CommitInfo )
{
	FTimespan ParsedTimespan;
			
	InputValid = FTimespan::Parse(NewText.ToString(), ParsedTimespan);
	if (InputValid && PropertyHandle.IsValid())
	{
		TArray<void*> RawData;
		PropertyHandle->AccessRawData(RawData);

		PropertyHandle->NotifyPreChange();
		for (auto RawDataInstance : RawData)
		{
			*(FTimespan*)RawDataInstance = ParsedTimespan;
		}
		PropertyHandle->NotifyPostChange();
		PropertyHandle->NotifyFinishedChangingProperties();
	}
}


#undef LOCTEXT_NAMESPACE