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

#include "DataTableEditorPrivatePCH.h"

#include "DataTableEditor.h"
#include "Toolkits/IToolkitHost.h"
#include "Editor/WorkspaceMenuStructure/Public/WorkspaceMenuStructureModule.h"
 
#define LOCTEXT_NAMESPACE "DataTableEditor"

const FName FDataTableEditor::DataTableTabId( TEXT( "DataTableEditor_DataTable" ) );

void FDataTableEditor::RegisterTabSpawners(const TSharedRef<class FTabManager>& TabManager)
{
	const IWorkspaceMenuStructure& MenuStructure = WorkspaceMenu::GetMenuStructure();

	TabManager->RegisterTabSpawner( DataTableTabId, FOnSpawnTab::CreateSP(this, &FDataTableEditor::SpawnTab_DataTable) )
		.SetDisplayName( LOCTEXT("DataTableTab", "Data Table") )
		.SetGroup( MenuStructure.GetAssetEditorCategory() );
}

void FDataTableEditor::UnregisterTabSpawners(const TSharedRef<class FTabManager>& TabManager)
{
	TabManager->UnregisterTabSpawner( DataTableTabId );
}

FDataTableEditor::~FDataTableEditor()
{

}


void FDataTableEditor::InitDataTableEditor( const EToolkitMode::Type Mode, const TSharedPtr< class IToolkitHost >& InitToolkitHost, UDataTable* Table )
{
	TSharedRef<FTabManager::FLayout> StandaloneDefaultLayout = FTabManager::NewLayout( "Standalone_DataTableEditor_Layout" )
	->AddArea
	(
		FTabManager::NewPrimaryArea()
		->Split
		(
			FTabManager::NewStack()
			->AddTab( DataTableTabId, ETabState::OpenedTab )
		)
	);

	const bool bCreateDefaultStandaloneMenu = true;
	const bool bCreateDefaultToolbar = false;
	FAssetEditorToolkit::InitAssetEditor( Mode, InitToolkitHost, FDataTableEditorModule::DataTableEditorAppIdentifier, StandaloneDefaultLayout, bCreateDefaultStandaloneMenu, bCreateDefaultToolbar, Table );
	
	FDataTableEditorModule& DataTableEditorModule = FModuleManager::LoadModuleChecked<FDataTableEditorModule>( "DataTableEditor" );
	AddMenuExtender(DataTableEditorModule.GetMenuExtensibilityManager()->GetAllExtenders(GetToolkitCommands(), GetEditingObjects()));

	// @todo toolkit world centric editing
	/*// Setup our tool's layout
	if( IsWorldCentricAssetEditor() )
	{
		const FString TabInitializationPayload(TEXT(""));		// NOTE: Payload not currently used for table properties
		SpawnToolkitTab( DataTableTabId, TabInitializationPayload, EToolkitTabSpot::Details );
	}*/

	// NOTE: Could fill in asset editor commands here!
}

FName FDataTableEditor::GetToolkitFName() const
{
	return FName("DataTableEditor");
}

FText FDataTableEditor::GetBaseToolkitName() const
{
	return LOCTEXT( "AppLabel", "DataTable Editor" );
}


FString FDataTableEditor::GetWorldCentricTabPrefix() const
{
	return LOCTEXT("WorldCentricTabPrefix", "DataTable ").ToString();
}


FLinearColor FDataTableEditor::GetWorldCentricTabColorScale() const
{
	return FLinearColor( 0.0f, 0.0f, 0.2f, 0.5f );
}

TSharedPtr<SUniformGridPanel> FDataTableEditor::CreateGridPanel()
{
	TSharedPtr<SUniformGridPanel> GridPanel = SNew(SUniformGridPanel).SlotPadding( FMargin( 2.0f ) );

	if (DataTable != NULL)
	{
		if (CachedDataTable.Num() == 0)
		{
			CachedDataTable = DataTable->GetTableData();

			RowsVisibility.SetNum(CachedDataTable.Num());
			for (int32 i = 0; i < RowsVisibility.Num(); ++i)
			{
				RowsVisibility[i] = true;
			}
		}

		check(CachedDataTable.Num() > 0 && CachedDataTable.Num() == RowsVisibility.Num());

		int32 RowIndex = 0;
		TArray<FString>& ColumnTitles = CachedDataTable[0];
		for(int i = 0;i<CachedDataTable.Num();++i)
		{
			if (RowsVisibility[i])
			{
				bool bIsHeader =  (i == 0);

				FLinearColor RowColor = (RowIndex % 2 == 0) ? FLinearColor::Gray : FLinearColor::Black;				
				if (bIsHeader)
				{
					RowColor = FLinearColor::Gray;
				}
				
				TArray<FString>& Row = CachedDataTable[i];				
				for(int Column = 0;Column<Row.Num();++Column)
				{
					GridPanel->AddSlot(Column, RowIndex)
						[
							SNew(SBorder)
							.Padding(1)
							.BorderImage( FEditorStyle::GetBrush( "ToolPanel.GroupBorder" ) )
							.BorderBackgroundColor(RowColor)						
							[
								SNew(STextBlock)
								.Text(Row[Column])
								.ToolTipText(bIsHeader 
								?	(FString::Printf(TEXT("Column '%s"), *ColumnTitles[Column])) 
								:	(FString::Printf(TEXT("%s: %s"), *ColumnTitles[Column], *Row[Column])))
							]
						];
				}

				++RowIndex;
			}
		}
	}
	return GridPanel;
}

void FDataTableEditor::OnSearchTextChanged(const FText& SearchText)
{
	FString SearchFor = SearchText.ToString();
	if (!SearchFor.IsEmpty())
	{
		check(CachedDataTable.Num() == RowsVisibility.Num());

		// starting from index 1, because 0 is header
		for (int32 RowIdx = 1; RowIdx < CachedDataTable.Num(); ++RowIdx)
		{
			RowsVisibility[RowIdx] = false;

			for (int32 i = 0; i < CachedDataTable[RowIdx].Num(); ++i)
			{
				if (SearchFor.Len() < CachedDataTable[RowIdx][i].Len())
				{
					if (CachedDataTable[RowIdx][i].Contains(SearchFor))
					{
						RowsVisibility[RowIdx] = true;
						break;
					}
				}
			}
		}
	}
	else
	{
		for (int32 RowIdx = 0; RowIdx < RowsVisibility.Num(); ++RowIdx)
		{
			RowsVisibility[RowIdx] = true;
		}
	}

	ReloadVisibleData();
}

void FDataTableEditor::ReloadVisibleData()
{
	if (ScrollBoxWidget.IsValid())
	{
		ScrollBoxWidget->ClearChildren();
		ScrollBoxWidget->AddSlot()
			[
				CreateGridPanel().ToSharedRef()
			];
	}
}

TSharedRef<SVerticalBox> FDataTableEditor::CreateContentBox()
{
	return SNew(SVerticalBox)
		+SVerticalBox::Slot()
		.AutoHeight()
		[
			SAssignNew(SearchBox, SSearchBox)
			.OnTextChanged(this, &FDataTableEditor::OnSearchTextChanged)
		]
		+SVerticalBox::Slot()
		[
			SAssignNew(ScrollBoxWidget, SScrollBox)
			+SScrollBox::Slot()
			[
				CreateGridPanel().ToSharedRef()
			]
		];
}

void FDataTableEditor::OnDataTableReloaded() 
{
	TSharedRef<SVerticalBox> ContentBox = CreateContentBox();
	
	GridPanelOwner->SetContent(ContentBox);
}

TSharedRef<SDockTab> FDataTableEditor::SpawnTab_DataTable( const FSpawnTabArgs& Args )
{
	check( Args.GetTabId().TabType == DataTableTabId );

	DataTable = Cast<UDataTable>(GetEditingObject());

	TSharedRef<SVerticalBox> ContentBox = CreateContentBox();

	GridPanelOwner = 
		SNew(SBorder)
		.Padding(2)
		.VAlign(VAlign_Top)
		.HAlign(HAlign_Left)
		.BorderImage( FEditorStyle::GetBrush( "ToolPanel.GroupBorder" ) )
		[
			ContentBox
		];

	return SNew(SDockTab)
		.Icon( FEditorStyle::GetBrush("DataTableEditor.Tabs.Properties") )
		.Label( LOCTEXT("DataTableTitle", "Data Table") )
		.TabColorScale( GetTabColorScale() )
		[
			GridPanelOwner.ToSharedRef()
		];
}


#undef LOCTEXT_NAMESPACE