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

#include "AnimationModifier.h"
#include "Animation/AnimSequence.h"
#include "Animation/Skeleton.h"
#include "ModifierOutputFilter.h"
#include "Editor/Transactor.h"
#include "UObject/UObjectIterator.h"

#include "Dialogs/Dialogs.h"
#include "Editor/Transactor.h"
#include "UObject/UObjectIterator.h"

void UAnimationModifier::ApplyToAnimationSequence(class UAnimSequence* InAnimationSequence)
{
	FEditorScriptExecutionGuard ScriptGuard;

	checkf(InAnimationSequence, TEXT("Invalid Animation Sequence supplied"));
	CurrentAnimSequence = InAnimationSequence;
	CurrentSkeleton = InAnimationSequence->GetSkeleton();

	// Filter to check for warnings / errors thrown from animation blueprint library (rudimentary approach for now)
	FCategoryLogOutputFilter OutputLog;
	OutputLog.SetAutoEmitLineTerminator(true);
	OutputLog.AddCategoryName("LogAnimationBlueprintLibrary");

	GLog->AddOutputDevice(&OutputLog);
		
	// Transact the modifier to prevent instance variables/data to change during applying
	FTransaction ModifierTransaction;
	ModifierTransaction.SaveObject(this);

	FTransaction AnimationDataTransaction;
	AnimationDataTransaction.SaveObject(CurrentAnimSequence);
	AnimationDataTransaction.SaveObject(CurrentSkeleton);

	/** This populates the log with possible warnings and or errors to notify the user about */
	OnRevert(CurrentAnimSequence);
	OnApply(CurrentAnimSequence);

	// Apply transaction
	ModifierTransaction.BeginOperation();
	ModifierTransaction.Apply();
	ModifierTransaction.EndOperation();

	GLog->RemoveOutputDevice(&OutputLog);

	// Check if warnings or errors have occurred and show dialog to user to inform her about this
	const bool bWarningsOrErrors = OutputLog.ContainsWarnings() || OutputLog.ContainsErrors();
	bool bShouldRevert = false;
	if (bWarningsOrErrors)
	{
		static const FText WarningMessageFormat = FText::FromString("Modifier has generated warnings during a test run:\n\n{0}\nAre you sure you want to Apply it?");
		static const FText ErrorMessageFormat = FText::FromString("Modifier has generated errors (and warnings) during a test run:\n\n{0}\nResolve the Errors before trying to Apply!");

		EAppMsgType::Type MessageType = OutputLog.ContainsErrors() ? EAppMsgType::Ok : EAppMsgType::YesNo;
		const FText& MessageFormat = OutputLog.ContainsErrors() ? ErrorMessageFormat : WarningMessageFormat;
		bShouldRevert = (OpenMsgDlgInt(MessageType, FText::FormatOrdered(MessageFormat, FText::FromString(OutputLog)), FText::FromString("Modifier has Generated Warnings/Errors")) != EAppReturnType::Yes);
	}

	// Revert changes if necessary, otherwise post edit and refresh animation data
	if (bShouldRevert)
	{
		AnimationDataTransaction.BeginOperation();
		AnimationDataTransaction.Apply();
		AnimationDataTransaction.EndOperation();
		CurrentAnimSequence->RefreshCacheData();
		CurrentAnimSequence->RefreshCurveData();
	}
	else
	{		
		UpdateCompressedAnimationData();


		CurrentAnimSequence->PostEditChange();
		CurrentSkeleton->PostEditChange();		
		CurrentAnimSequence->RefreshCacheData();
		CurrentAnimSequence->RefreshCurveData();

		UpdateStoredRevisions();
	}
		
	// Finished
	CurrentAnimSequence = nullptr;
	CurrentSkeleton = nullptr;
}

void UAnimationModifier::UpdateCompressedAnimationData()
{
	if (CurrentAnimSequence->DoesNeedRebake() || CurrentAnimSequence->DoesNeedRecompress())
	{
		if (CurrentAnimSequence->DoesNeedRebake())
		{
			CurrentAnimSequence->BakeTrackCurvesToRawAnimation();
		}

		if (CurrentAnimSequence->DoesNeedRecompress())
		{
			CurrentAnimSequence->RequestSyncAnimRecompression(false);
		}
	}
}

void UAnimationModifier::RevertFromAnimationSequence(class UAnimSequence* InAnimationSequence)
{
	FEditorScriptExecutionGuard ScriptGuard;

	checkf(InAnimationSequence, TEXT("Invalid Animation Sequence supplied"));
	CurrentAnimSequence = InAnimationSequence;
	CurrentSkeleton = InAnimationSequence->GetSkeleton();

	// Transact the modifier to prevent instance variables/data to change during reverting
	FTransaction Transaction;
	Transaction.SaveObject(this);

	OnRevert(CurrentAnimSequence);

	// Apply transaction
	Transaction.BeginOperation();
	Transaction.Apply();
	Transaction.EndOperation();

	UpdateCompressedAnimationData();

	CurrentAnimSequence->PostEditChange();
	CurrentSkeleton->PostEditChange();
	CurrentAnimSequence->RefreshCacheData();
	CurrentAnimSequence->RefreshCurveData();

	ResetStoredRevisions();

	// Finished
	CurrentAnimSequence = nullptr;
	CurrentSkeleton = nullptr;
}

bool UAnimationModifier::IsLatestRevisionApplied() const
{
	return (AppliedGuid == RevisionGuid);
}

void UAnimationModifier::PostInitProperties()
{
	Super::PostInitProperties();
	UpdateNativeRevisionGuid();

	// Ensure we always have a valid guid
	if (!RevisionGuid.IsValid())
	{
		UpdateRevisionGuid(GetClass());
		MarkPackageDirty();
	}
}

const USkeleton* UAnimationModifier::GetSkeleton()
{
	return CurrentSkeleton;
}

void UAnimationModifier::UpdateRevisionGuid(UClass* ModifierClass)
{
	RevisionGuid = FGuid::NewGuid();

	// Native classes are more difficult?
	for (TObjectIterator<UAnimationModifier> It; It; ++It)
	{
		if (*It != this && It->GetClass() == ModifierClass)
		{
			It->SetInstanceRevisionGuid(RevisionGuid);
		}
	}
}

void UAnimationModifier::UpdateNativeRevisionGuid()
{
	UClass* Class = GetClass();
	// Check if this is the class default object
	if (this == GetDefault<UAnimationModifier>(Class))
	{
		// If so check whether or not the config stored revision matches the natively defined one
		if (StoredNativeRevision != GetNativeClassRevision())
		{
			// If not update the blueprint revision GUID
			UpdateRevisionGuid(Class);
			StoredNativeRevision = GetNativeClassRevision();

			MarkPackageDirty();

			// Save the new native revision to config files
			SaveConfig();
			UpdateDefaultConfigFile();
		}
	}
}

int32 UAnimationModifier::GetNativeClassRevision() const
{
	// Overriden in derrived classes to perform native revisioning
	return 0;
}

const UAnimSequence* UAnimationModifier::GetAnimationSequence()
{
	return CurrentAnimSequence;
}

void UAnimationModifier::UpdateStoredRevisions()
{
	AppliedGuid = RevisionGuid;
}

void UAnimationModifier::ResetStoredRevisions()
{
	AppliedGuid.Invalidate();
}

void UAnimationModifier::SetInstanceRevisionGuid(FGuid Guid)
{
	RevisionGuid = Guid;
}