// Copyright 1998-2019 Epic Games, Inc. All Rights Reserved.

#include "TargetPlatformAudioCustomization.h"

#include "EditorDirectories.h"
#include "DetailWidgetRow.h"
#include "IDetailPropertyRow.h"
#include "IDetailChildrenBuilder.h"
#include "UObject/UnrealType.h"
#include "Widgets/Text/STextBlock.h"
#include "Widgets/Input/SComboButton.h"
#include "Widgets/Views/SListView.h"
#include "DetailLayoutBuilder.h"
#include "DetailCategoryBuilder.h"
#include "Widgets/Input/SEditableTextBox.h"
#include "Features/IModularFeatures.h"


#if WITH_ENGINE
#include "AudioDevice.h"
#endif 

IMPLEMENT_MODULE(FDefaultModuleImpl, AudioSettingsEditor)

#define LOCTEXT_NAMESPACE "PlatformAudio"

// This string is used for the item on the combo box that, when selected, defers to the custom string entry.
static const TCHAR* ManualEntryItem = TEXT("Other");

FAudioPluginWidgetManager::FAudioPluginWidgetManager()
{
	ManualReverbEntry = TSharedPtr<FText>(new FText(FText::FromString(TEXT("Built-in Reverb"))));
	ManualSpatializationEntry = TSharedPtr<FText>(new FText(FText::FromString(TEXT("Built-in Spatialization"))));
	ManualOcclusionEntry = TSharedPtr<FText>(new FText(FText::FromString(TEXT("Built-in Occlusion"))));
}

FAudioPluginWidgetManager::~FAudioPluginWidgetManager()
{
}

TSharedRef<SWidget> FAudioPluginWidgetManager::MakeAudioPluginSelectorWidget(const TSharedPtr<IPropertyHandle>& PropertyHandle, EAudioPlugin AudioPluginType, EAudioPlatform AudioPlatform)
{
	TArray<TSharedPtr<FText>>* ValidPluginNames = nullptr;
	FText TooltipText;
	TSharedPtr<FText> DefaultEffectName;

	switch (AudioPluginType)
	{
		case EAudioPlugin::SPATIALIZATION:
			ValidPluginNames = &SpatializationPlugins;
			TooltipText = LOCTEXT("Spatialization", "Choose which audio plugin should be used for spatialization. If your desired spatialization isn't found in the drop down menu, ensure that it is enabled on the Plugins panel.");
			DefaultEffectName = TSharedPtr<FText>(new FText(FText::FromString(TEXT("Built-in Spatialization"))));
			SelectedSpatialization = TSharedPtr<FText>(new FText(*DefaultEffectName));
			PropertyHandle->GetValueAsDisplayText(*SelectedSpatialization);
			break;

		case EAudioPlugin::REVERB:
			ValidPluginNames = &ReverbPlugins;
			TooltipText = LOCTEXT("Reverb", "Choose which audio plugin should be used for reverb. If your desired reverb plugin isn't found in the drop down menu, ensure that it is enabled on the Plugins panel.");
			DefaultEffectName = TSharedPtr<FText>(new FText(FText::FromString(TEXT("Built-in Reverb"))));
			SelectedReverb = TSharedPtr<FText>(new FText(*DefaultEffectName));
			PropertyHandle->GetValueAsDisplayText(*SelectedReverb);
			break;

		case EAudioPlugin::OCCLUSION:
			ValidPluginNames = &OcclusionPlugins;
			TooltipText = LOCTEXT("Occlusion", "Choose which audio plugin should be used for occlusion. If your desired occlusion plugin isn't found in the drop down menu, ensure that it is enabled on the Plugins panel.");
			DefaultEffectName = TSharedPtr<FText>(new FText(FText::FromString(TEXT("Built-in Occlusion"))));
			SelectedOcclusion = TSharedPtr<FText>(new FText(*DefaultEffectName));
			PropertyHandle->GetValueAsDisplayText(*SelectedOcclusion);
			break;

		default:
			checkf(false, TEXT("Invalid plugin enumeration type. Need to add a handle for that case here."));
			break;
	}

	ValidPluginNames->Add(DefaultEffectName);
	

#if WITH_ENGINE
	// Scan through all currently enabled audio plugins of this specific type:

	switch (AudioPluginType)
	{
		case EAudioPlugin::SPATIALIZATION:
		{
			TArray<IAudioSpatializationFactory*> AvailableSpatializationPlugins = IModularFeatures::Get().GetModularFeatureImplementations<IAudioSpatializationFactory>(IAudioSpatializationFactory::GetModularFeatureName());
			for (IAudioSpatializationFactory* Plugin : AvailableSpatializationPlugins)
			{
				if (Plugin->SupportsPlatform(AudioPlatform))
				{
					ValidPluginNames->Add(TSharedPtr<FText>(new FText(FText::FromString(Plugin->GetDisplayName()))));
				}
			}
		}
		break;

		case EAudioPlugin::REVERB:
		{
			TArray<IAudioReverbFactory*> AvailableReverbPlugins = IModularFeatures::Get().GetModularFeatureImplementations<IAudioReverbFactory>(IAudioReverbFactory::GetModularFeatureName());
			for (IAudioReverbFactory* Plugin : AvailableReverbPlugins)
			{
				if (Plugin->SupportsPlatform(AudioPlatform))
				{
					ValidPluginNames->Add(TSharedPtr<FText>(new FText(FText::FromString(Plugin->GetDisplayName()))));
				}
			}
		}
		break;

		case EAudioPlugin::OCCLUSION:
		{
			TArray<IAudioOcclusionFactory*> AvailableOcclusionPlugins = IModularFeatures::Get().GetModularFeatureImplementations<IAudioOcclusionFactory>(IAudioOcclusionFactory::GetModularFeatureName());
			for (IAudioOcclusionFactory* Plugin : AvailableOcclusionPlugins)
			{
				if (Plugin->SupportsPlatform(AudioPlatform))
				{
					ValidPluginNames->Add(TSharedPtr<FText>(new FText(FText::FromString(Plugin->GetDisplayName()))));
				}
			}
		}
		break;

		default:
			break;
	}
#endif // #if WITH_ENGINE

	// This pointer is used to store whatever custom string was input by the user or retrieved from the config file.
	ValidPluginNames->Add(TSharedPtr<FText>(new FText(FText::FromString(ManualEntryItem))));

	// Text box component:
	TSharedRef<SEditableTextBox> EditableTextBox = SNew(SEditableTextBox)
		.Text_Lambda([this, AudioPluginType]() { return OnGetPluginText(AudioPluginType); })
		.OnTextCommitted_Raw(this, &FAudioPluginWidgetManager::OnPluginTextCommitted, AudioPluginType, PropertyHandle)
		.SelectAllTextWhenFocused(true)
		.RevertTextOnEscape(true);

	// Combo box component:
	TSharedRef<SWidget> ComboBox = SNew(SListView<TSharedPtr<FText>>)
		.ListItemsSource(ValidPluginNames)
		.ScrollbarVisibility(EVisibility::Collapsed)
		.OnGenerateRow_Lambda([](TSharedPtr<FText> InItem, const TSharedRef< class STableViewBase >& Owner)
		{
			return SNew(STableRow<TSharedPtr<FText>>, Owner)
				   .Padding(FMargin(16, 4, 16, 4))
				   [
					   SNew(STextBlock).Text(*InItem)
				   ];
		})
		.OnSelectionChanged_Lambda([this, AudioPluginType, PropertyHandle](TSharedPtr<FText> InText, ESelectInfo::Type)
		{
			const bool bSelectedManualEntry = (InText->ToString() == FString(ManualEntryItem));

			switch (AudioPluginType)
			{
				case EAudioPlugin::SPATIALIZATION:
					if (bSelectedManualEntry)
					{
						SelectedSpatialization = ManualSpatializationEntry;
					}
					else
					{
						SelectedSpatialization = InText;
					}
					
					OnPluginSelected(bSelectedManualEntry ? ManualSpatializationEntry->ToString() : InText->ToString(), PropertyHandle);
					break;

				case EAudioPlugin::REVERB:
					if (bSelectedManualEntry)
					{
						SelectedReverb = ManualReverbEntry;
					}
					else
					{
						SelectedReverb = InText;
					}
					
					OnPluginSelected(bSelectedManualEntry ? ManualReverbEntry->ToString() : InText->ToString(), PropertyHandle);
					break;

				case EAudioPlugin::OCCLUSION:
					if (bSelectedManualEntry)
					{
						SelectedOcclusion = ManualOcclusionEntry;
					}
					else
					{
						SelectedOcclusion = InText;
					}
					
					OnPluginSelected((bSelectedManualEntry ? ManualOcclusionEntry->ToString() : InText->ToString()), PropertyHandle);
					break;

				default:
					break;
			}
		});


	//Generate widget:
	const TSharedRef<SWidget> NewWidget = SNew(SComboButton)
		.ContentPadding(FMargin(0, 0, 5, 0))
		.ToolTipText(TooltipText)
		.ButtonContent()
		[
			SNew(SBorder)
			.BorderImage(FEditorStyle::GetBrush("NoBorder"))
			.Padding(FMargin(0, 0, 5, 0))
			[
				EditableTextBox
			]
		]
		.MenuContent()
		[
			ComboBox
		];

	return NewWidget;
}

void FAudioPluginWidgetManager::BuildAudioCategory(IDetailLayoutBuilder& DetailLayout, EAudioPlatform AudioPlatform)
{
	IDetailCategoryBuilder& AudioCategory = DetailLayout.EditCategory(TEXT("Audio"));

	TSharedPtr<IPropertyHandle> AudioSpatializationPropertyHandle = DetailLayout.GetProperty("SpatializationPlugin");
	IDetailPropertyRow& AudioSpatializationPropertyRow = AudioCategory.AddProperty(AudioSpatializationPropertyHandle);

	AudioSpatializationPropertyRow.CustomWidget()
		.NameContent()
		[
			AudioSpatializationPropertyHandle->CreatePropertyNameWidget()
		]
		.ValueContent()
		.MaxDesiredWidth(500.0f)
		.MinDesiredWidth(100.0f)
		[
			MakeAudioPluginSelectorWidget(AudioSpatializationPropertyHandle, EAudioPlugin::SPATIALIZATION, AudioPlatform)
		];

	TSharedPtr<IPropertyHandle> AudioReverbPropertyHandle = DetailLayout.GetProperty("ReverbPlugin");
	IDetailPropertyRow& AudioReverbPropertyRow = AudioCategory.AddProperty(AudioReverbPropertyHandle);

	AudioReverbPropertyRow.CustomWidget()
		.NameContent()
		[
			AudioReverbPropertyHandle->CreatePropertyNameWidget()
		]
		.ValueContent()
		.MaxDesiredWidth(500.0f)
		.MinDesiredWidth(100.0f)
		[
			MakeAudioPluginSelectorWidget(AudioReverbPropertyHandle, EAudioPlugin::REVERB, AudioPlatform)
		];

	TSharedPtr<IPropertyHandle> AudioOcclusionPropertyHandle = DetailLayout.GetProperty("OcclusionPlugin");
	IDetailPropertyRow& AudioOcclusionPropertyRow = AudioCategory.AddProperty(AudioOcclusionPropertyHandle);

	AudioOcclusionPropertyRow.CustomWidget()
		.NameContent()
		[
			AudioOcclusionPropertyHandle->CreatePropertyNameWidget()
		]
		.ValueContent()
		.MaxDesiredWidth(500.0f)
		.MinDesiredWidth(100.0f)
		[
			MakeAudioPluginSelectorWidget(AudioOcclusionPropertyHandle, EAudioPlugin::OCCLUSION, AudioPlatform)
		];
}

void FAudioPluginWidgetManager::OnPluginSelected(FString PluginName, TSharedPtr<IPropertyHandle> PropertyHandle)
{
	PropertyHandle->SetValue(PluginName);
}

void FAudioPluginWidgetManager::OnPluginTextCommitted(const FText& InText, ETextCommit::Type CommitType, EAudioPlugin AudioPluginType, TSharedPtr<IPropertyHandle> PropertyHandle)
{
	switch (AudioPluginType)
	{
		case EAudioPlugin::SPATIALIZATION:
			*ManualSpatializationEntry = InText;
			SelectedSpatialization = ManualSpatializationEntry;
			break;

		case EAudioPlugin::REVERB:
			*ManualReverbEntry = InText;
			SelectedReverb = ManualReverbEntry;
			break;

		case EAudioPlugin::OCCLUSION:
			*ManualOcclusionEntry = InText;
			SelectedOcclusion = ManualOcclusionEntry;
			break;

		default:
			break;
	}

	OnPluginSelected(InText.ToString(), PropertyHandle);
}

FText FAudioPluginWidgetManager::OnGetPluginText(EAudioPlugin AudioPluginType)
{
	switch (AudioPluginType)
	{
		case EAudioPlugin::SPATIALIZATION:
			return *SelectedSpatialization;
			break;
	
		case EAudioPlugin::REVERB:
			return *SelectedReverb;
			break;

		case EAudioPlugin::OCCLUSION:
			return *SelectedOcclusion;
			break;
	
		default:
			return FText::FromString(FString(TEXT("ERROR")));
			break;
	}
}

#undef LOCTEXT_NAMESPACE