// Copyright 2026, Algoryx Simulation AB.

#include "Cable/AGX_CableComponent.h"

// AGX Dynamics for Unreal includes.
#include "AGX_AssetGetterSetterImpl.h"
#include "AGX_Check.h"
#include "AGX_LogCategory.h"
#include "AGX_NativeOwnerSceneComponentInstanceData.h"
#include "AGX_PropertyChangedDispatcher.h"
#include "AGX_RigidBodyComponent.h"
#include "AGX_Simulation.h"
#include "Cable/AGX_CableProperties.h"
#include "Cable/CableNodeBarrier.h"
#include "Import/AGX_ImportContext.h"
#include "Utilities/AGX_ImportRuntimeUtilities.h"
#include "Utilities/AGX_NotificationUtilities.h"
#include "Utilities/AGX_ObjectUtilities.h"
#include "Utilities/AGX_StringUtilities.h"

// Unreal Engine includes.
#include "Components/InstancedStaticMeshComponent.h"
#if WITH_EDITOR
#include "Editor.h"
#endif
#include "Engine/StaticMesh.h"
#include "Engine/World.h"
#include "Kismet/KismetMathLibrary.h"

namespace AGX_CableComponent_helpers
{
	std::tuple<FRigidBodyBarrier*, FTransform> GetBodyAndLocalTransform(
		const FAGX_CableRouteNode& RouteNode, const FTransform& CableTransform)
	{
		UAGX_RigidBodyComponent* BodyComponent = RouteNode.RigidBody.GetRigidBody();
		if (BodyComponent == nullptr)
		{
			return {nullptr, FTransform::Identity};
		}
		FRigidBodyBarrier* NativeBody = BodyComponent->GetOrCreateNative();
		check(NativeBody);
		const FTransform Transform = RouteNode.Frame.GetRelativeTo(*BodyComponent, CableTransform);
		return {NativeBody, Transform};
	}

	void SetLocalScope(UAGX_CableComponent& Component)
	{
		AActor* Owner = FAGX_ObjectUtilities::GetRootParentActor(Component);
		for (auto& Node : Component.RouteNodes)
		{
			Node.RigidBody.LocalScope = Owner;
			Node.Frame.Parent.LocalScope = Owner;
		}
	}

	void SetLocalScope(FAGX_CableRouteNode& Node, AActor* Owner)
	{
		Node.RigidBody.LocalScope = Owner;
		Node.Frame.Parent.LocalScope = Owner;
	}

	void SetVisualsInstanceCount(UInstancedStaticMeshComponent& Mesh, int32 Count)
	{
		const int32 N = std::max(0, Count);
		while (Mesh.GetInstanceCount() < N)
		{
			Mesh.AddInstance(FTransform());
		}
		while (Mesh.GetInstanceCount() > N)
		{
			Mesh.RemoveInstance(Mesh.GetInstanceCount() - 1);
		}
	}

	void PrintNodeModifiedAlreadyInitializedWarning(const UAGX_CableComponent& Cable)
	{
		UE_LOG(
			LogAGX, Warning,
			TEXT("Route node modification to already initialized Cable '%s' in '%s'. This route "
				 "node will be ignored."),
			*Cable.GetName(), *GetLabelSafe(Cable.GetOwner()));
	}
}

UAGX_CableComponent::UAGX_CableComponent()
{
	PrimaryComponentTick.bCanEverTick = true;

	// Add a pair of default nodes to make initial editing easier.
	AddNodeAtLocation(FVector::ZeroVector);
	AddNodeAtLocation(FVector(100.0f, 0.0f, 0.0f));

	AGX_CableComponent_helpers::SetLocalScope(*this);

	// Setup default visuals.
	static const TCHAR* CableMatAssetPath =
		TEXT("Material'/AGXUnreal/Cable/MI_GrayCable.MI_GrayCable'");
	RenderMaterial = FAGX_ObjectUtilities::GetAssetFromPath<UMaterialInterface>(CableMatAssetPath);
}

bool UAGX_CableComponent::SetCableProperties(UAGX_CableProperties* Properties)
{
	UAGX_CableProperties* CablePropertiesOrig = CableProperties;
	CableProperties = Properties;

	if (!HasNative())
	{
		// Not in play, we are done.
		return true;
	}

	// UpdateNativeMaterial is responsible to create an instance if none exists and do the
	// asset/instance swap.
	if (!UpdateNativeCableProperties())
	{
		// Something went wrong, restore original CableProperties.
		CableProperties = CablePropertiesOrig;
		return false;
	}

	return true;
}

void UAGX_CableComponent::SetRenderMaterial(UMaterialInterface* Material)
{
	RenderMaterial = Material;

	if (VisualCylinders != nullptr)
		VisualCylinders->SetMaterial(0, RenderMaterial);

	if (VisualSpheres != nullptr)
		VisualSpheres->SetMaterial(0, RenderMaterial);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNode()
{
	int32 _;
	return AddNode(_);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNode(int32& OutIndex)
{
	return AddNode(FAGX_CableRouteNode(), OutIndex);
}

FAGX_CableRouteNode& UAGX_CableComponent::CreateNode(int32& OutIndex)
{
	return AddNode(OutIndex);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNode(const FAGX_CableRouteNode& InNode)
{
	int32 _;
	return AddNode(InNode, _);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNode(
	const FAGX_CableRouteNode& InNode, int32& OutIndex)
{
	const int32 Index = RouteNodes.Num();
	OutIndex = Index;
	return AddNodeAtIndex(InNode, Index);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNodeAtLocation(FVector InLocation)
{
	int32 _;
	return AddNodeAtLocation(InLocation, _);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNodeAtLocation(FVector InLocation, int32& OutIndex)
{
	return AddNode(FAGX_CableRouteNode(InLocation), OutIndex);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNodeAtLocationAtIndex(
	FVector InLocation, int32 InIndex)
{
	return AddNodeAtIndex(FAGX_CableRouteNode(InLocation), InIndex);
}

FAGX_CableRouteNode& UAGX_CableComponent::AddNodeAtIndex(
	const FAGX_CableRouteNode& InNode, int32 InIndex)
{
	if (HasNative())
	{
		AGX_CableComponent_helpers::PrintNodeModifiedAlreadyInitializedWarning(*this);
	}
	if (!RouteNodes.IsValidIndex(InIndex) && InIndex != RouteNodes.Num())
	{
		UE_LOG(
			LogAGX, Warning,
			TEXT(
				"AddNodeAtIndex called on Cable '%s' in '%s' with Index %d which is invalid. Nodes "
				"may only be added at an index where there already is a node, or one-past-end."),
			*GetName(), *GetLabelSafe(GetOwner()), InIndex);
		return InvalidCableRoutingNode;
	}
	RouteNodes.Insert(InNode, InIndex);
	FAGX_CableRouteNode& NewNode = RouteNodes[InIndex];
	AActor* LocalScope = FAGX_ObjectUtilities::GetRootParentActor(this);
	AGX_CableComponent_helpers::SetLocalScope(NewNode, LocalScope);
	return NewNode;
}

void UAGX_CableComponent::SetNode(const int32 InIndex, const FAGX_CableRouteNode InNode)
{
	if (HasNative())
	{
		AGX_CableComponent_helpers::PrintNodeModifiedAlreadyInitializedWarning(*this);
	}
	if (!RouteNodes.IsValidIndex(InIndex))
	{
		UE_LOG(
			LogAGX, Warning,
			TEXT("Out-of-bounds index %d for route nodes array was passed to Set Node in Cable "
				 "Component '%s' in Actor '%s'"),
			InIndex, *GetName(), *GetLabelSafe(GetOwner()));
		return;
	}
	RouteNodes[InIndex] = InNode;
	AActor* LocalScope = FAGX_ObjectUtilities::GetRootParentActor(this);
	AGX_CableComponent_helpers::SetLocalScope(RouteNodes[InIndex], LocalScope);
}

void UAGX_CableComponent::RemoveNode(int32 InIndex)
{
	if (HasNative())
		AGX_CableComponent_helpers::PrintNodeModifiedAlreadyInitializedWarning(*this);

	RouteNodes.RemoveAt(InIndex);
}

void UAGX_CableComponent::SetNodeLocalLocation(int32 InIndex, FVector InLocation)
{
	if (HasNative())
		AGX_CableComponent_helpers::PrintNodeModifiedAlreadyInitializedWarning(*this);

	RouteNodes[InIndex].Frame.LocalLocation = InLocation;
}

void UAGX_CableComponent::SetNodeLocation(int32 InIndex, const FVector InLocation)
{
	if (HasNative())
	{
		AGX_CableComponent_helpers::PrintNodeModifiedAlreadyInitializedWarning(*this);
	}
	USceneComponent* Parent = RouteNodes[InIndex].Frame.GetParentComponent();
	if (Parent == nullptr)
	{
		// No parent means the LocalLocation is relative to the Cable Component and thus InLocation
		// can be used as-is.
		RouteNodes[InIndex].Frame.LocalLocation = InLocation;
		return;
	}

	// Compute a local location relative to the parent that has the same world location as
	// InLocation in the Cable Component.
	const FTransform& ParentTransform = Parent->GetComponentTransform();
	const FTransform& CableTransform = GetComponentTransform();
	const FTransform& CableToParent = CableTransform.GetRelativeTransform(ParentTransform);
	const FVector LocationInParent = CableToParent.TransformPosition(InLocation);
	RouteNodes[InIndex].Frame.LocalLocation = LocationInParent;
}

void UAGX_CableComponent::AddCollisionGroup(FName GroupName)
{
	if (GroupName.IsNone())
	{
		return;
	}

	if (CollisionGroups.Contains(GroupName))
		return;

	CollisionGroups.Add(GroupName);
	if (HasNative())
		NativeBarrier.AddCollisionGroup(GroupName);
}

void UAGX_CableComponent::RemoveCollisionGroupIfExists(FName GroupName)
{
	if (GroupName.IsNone())
		return;

	auto Index = CollisionGroups.IndexOfByKey(GroupName);
	if (Index == INDEX_NONE)
		return;

	CollisionGroups.RemoveAt(Index);
	if (HasNative())
		NativeBarrier.RemoveCollisionGroup(GroupName);
}

FCableBarrier* UAGX_CableComponent::GetOrCreateNative()
{
	if (!HasNative())
	{
		if (GIsReconstructingBlueprintInstances)
		{
			// We're in a very bad situation. Someone need this Component's native but if we're in
			// the middle of a RerunConstructionScripts and this Component haven't been given its
			// Native yet then there isn't much we can do. We can't create a new one since we will
			// be given the actual Native soon, but we also can't return the actual Native right now
			// because it hasn't been restored from the Component Instance Data yet.
			//
			// For now we simply die in non-shipping (checkNoEntry is active) so unit tests will
			// detect this situation, and log error and return nullptr otherwise, so that the
			// application can at least keep running. It is unlikely that the simulation will behave
			// as intended.
			checkNoEntry();
			UE_LOG(
				LogAGX, Error,
				TEXT(
					"A request for the AGX Dynamics instance for Cable '%s' in '%s' was "
					"made but we are in the middle of a Blueprint Reconstruction and the requested "
					"instance has not yet been restored. The instance cannot be returned, which "
					"may lead to incorrect scene configuration."),
				*GetName(), *GetLabelSafe(GetOwner()));
			return nullptr;
		}

		CreateNative();
	}

	return GetNative();
}

TArray<FAGX_CableNodeInfo> UAGX_CableComponent::GetNodeInfo() const
{
	TArray<FAGX_CableNodeInfo> Nodes;
	if (HasNative())
	{
		return NativeBarrier.GetNodeInfo();
	}
	else
	{
		for (auto& RouteNode : RouteNodes)
		{
			const FTransform WorldTransform(
				RouteNode.Frame.GetWorldRotation(), RouteNode.Frame.GetWorldLocation(*this));
			Nodes.Add(FAGX_CableNodeInfo(
				RouteNode.NodeType, WorldTransform, RouteNode.LockRotationToBody));
		}
	}

	return Nodes;
}

void UAGX_CableComponent::MarkVisualsDirty()
{
	UpdateVisuals();
}

namespace AGX_CableComponent_helpers
{
	UAGX_CableProperties* CreateCableProperties(
		const FCableBarrier& Barrier, FAGX_ImportContext& Context)
	{
		const FCablePropertiesBarrier PropBarrier = Barrier.GetCableProperties();
		if (!PropBarrier.HasNative())
			return nullptr;

		AGX_CHECK(!Context.CableProperties->Contains(PropBarrier.GetGuid()));

		auto Properties =
			NewObject<UAGX_CableProperties>(Context.Outer, NAME_None, RF_Public | RF_Standalone);
		FAGX_ImportRuntimeUtilities::OnAssetTypeCreated(*Properties, Context.SessionGuid);
		Properties->CopyFrom(Barrier, &Context);
		return Properties;
	}
}

void UAGX_CableComponent::CopyFrom(const FCableBarrier& Barrier, FAGX_ImportContext* Context)
{
	using namespace AGX_CableComponent_helpers;
	if (!Barrier.HasNative())
		return;

	Radius = Barrier.GetRadius();
	SegmentLength = Barrier.GetSegmentLength();

	const FString CleanBarrierName =
		FAGX_ImportRuntimeUtilities::RemoveModelNameFromBarrierName(*this, Barrier.GetName(), Context);
	const FString Name = FAGX_ObjectUtilities::SanitizeAndMakeNameUnique(
		GetOwner(), CleanBarrierName, UAGX_CableComponent::StaticClass());
	Rename(*Name);

	for (const FName& Group : Barrier.GetCollisionGroups())
		AddCollisionGroup(Group);

	RouteNodes.Empty();
	const TArray<FAGX_CableNodeInfo> NodeInfosAGX = Barrier.GetNodeInfo();
	FTransform CableTransform = FTransform::Identity;
	if (NodeInfosAGX.Num() > 0)
	{
		CableTransform.SetLocation(NodeInfosAGX[0].WorldTransform.GetLocation());
		SetWorldTransform(CableTransform);
	}

	if (Context == nullptr || Context->Cables == nullptr || Context->RigidBodies == nullptr)
		return; // We are done.

	ImportName = Barrier.GetName();
	ImportGuid = Barrier.GetGuid();
	for (auto& NodeInfoAGX : NodeInfosAGX)
	{
		FAGX_CableRouteNode NewNode;
		NewNode.NodeType = NodeInfoAGX.NodeType;
		NewNode.LockRotationToBody = NodeInfoAGX.LockRotationToBody;
		const FTransform& NodeTransformAGX = NodeInfoAGX.WorldTransform;
		if (NodeInfoAGX.NodeType == EAGX_CableNodeType::Free)
		{
			NewNode.Frame.LocalLocation =
				CableTransform.InverseTransformPositionNoScale(NodeTransformAGX.GetLocation());
			NewNode.Frame.LocalRotation =
				CableTransform.InverseTransformRotation(NodeTransformAGX.GetRotation()).Rotator();
			NewNode.Frame.Parent.Name = GetFName();
		}
		else if (NodeInfoAGX.NodeType == EAGX_CableNodeType::BodyFixed)
		{
			if (auto BodyComponent = Context->RigidBodies->FindRef(NodeInfoAGX.BodyGuid))
			{
				// Note: avoid setting component ptrs here since both them and their owners may get
				// destroyed if we are doing an import. Instead we just set the Name.
				NewNode.RigidBody.Name = BodyComponent->GetFName();
				NewNode.Frame.Parent.Name = BodyComponent->GetFName();
				NewNode.Frame.LocalLocation =
					BodyComponent->GetComponentTransform().InverseTransformPositionNoScale(
						NodeInfoAGX.WorldTransform.GetLocation());
				NewNode.Frame.LocalRotation =
					BodyComponent->GetComponentTransform()
						.InverseTransformRotation(NodeInfoAGX.WorldTransform.GetRotation())
						.Rotator();
			}
		}

		AddNode(NewNode);
	}

	AGX_CHECK(!Context->Cables->Contains(ImportGuid));
	Context->Cables->Add(ImportGuid, this);
	CableProperties = CreateCableProperties(Barrier, *Context);
}

FCableBarrier* UAGX_CableComponent::GetNative()
{
	if (!HasNative())
		return nullptr;

	return &NativeBarrier;
}

const FCableBarrier* UAGX_CableComponent::GetNative() const
{
	if (!HasNative())
		return nullptr;

	return &NativeBarrier;
}

bool UAGX_CableComponent::HasNative() const
{
	return NativeBarrier.HasNative();
}

uint64 UAGX_CableComponent::GetNativeAddress() const
{
	return static_cast<uint64>(NativeBarrier.GetNativeAddress());
}

void UAGX_CableComponent::SetNativeAddress(uint64 NativeAddress)
{
	check(!HasNative());
	NativeBarrier.SetNativeAddress(static_cast<uintptr_t>(NativeAddress));
}

void UAGX_CableComponent::BeginPlay()
{
	Super::BeginPlay();

	if (VisualCylinders == nullptr || VisualSpheres == nullptr)
		CreateVisuals();

	if (!HasNative() && !GIsReconstructingBlueprintInstances)
		CreateNative();
}

void UAGX_CableComponent::EndPlay(const EEndPlayReason::Type Reason)
{
	Super::EndPlay(Reason);
	if (GIsReconstructingBlueprintInstances)
	{
		// Another UAGX_CableComponent will inherit this one's Native, so don't wreck it.
		// The call to NativeBarrier.ReleaseNative below is safe because the AGX Dynamics Simulation
		// will retain a reference counted pointer to the AGX Dynamics Observer Frame.
	}
	else if (
		HasNative() && Reason != EEndPlayReason::EndPlayInEditor &&
		Reason != EEndPlayReason::Quit && Reason != EEndPlayReason::LevelTransition)
	{
		if (UAGX_Simulation* Sim = UAGX_Simulation::GetFrom(this))
			Sim->Remove(*this);
	}

	if (HasNative())
		NativeBarrier.ReleaseNative();
}

void UAGX_CableComponent::DestroyComponent(bool bPromoteChildren)
{
	if (VisualCylinders != nullptr)
		VisualCylinders->DestroyComponent();

	if (VisualSpheres != nullptr)
		VisualSpheres->DestroyComponent();

#if WITH_EDITOR
	if (MapLoadDelegateHandle.IsValid())
		FEditorDelegates::MapChange.Remove(MapLoadDelegateHandle);

	if (ObjectsReplacedDelegateHandle.IsValid())
		FCoreUObjectDelegates::OnObjectsReplaced.Remove(ObjectsReplacedDelegateHandle);

	for (TTuple<USceneComponent*, FParentDelegate>& Entry : DelegateHandles)
	{
		if (Entry.Value.Parent.IsValid())
			Entry.Value.Parent->TransformUpdated.Remove(Entry.Value.DelegateHandle);
	}
#endif

	Super::DestroyComponent(bPromoteChildren);
}

TStructOnScope<FActorComponentInstanceData> UAGX_CableComponent::GetComponentInstanceData() const
{
	return MakeStructOnScope<
		FActorComponentInstanceData, FAGX_NativeOwnerSceneComponentInstanceData>(
		this, this,
		[](UActorComponent* Component)
		{
			ThisClass* AsThisClass = Cast<ThisClass>(Component);
			return static_cast<IAGX_NativeOwner*>(AsThisClass);
		});
}

void UAGX_CableComponent::TickComponent(
	float DeltaTime, ELevelTick TickType, FActorComponentTickFunction* ThisTickFunction)
{
	Super::TickComponent(DeltaTime, TickType, ThisTickFunction);
	UpdateVisuals();
}

void UAGX_CableComponent::CreateNative()
{
	if (HasNative())
		return;

	check(!GIsReconstructingBlueprintInstances);
	AGX_CableComponent_helpers::SetLocalScope(*this);
	NativeBarrier.AllocateNative(Radius, SegmentLength);

	TArray<FString> ErrorMessages;
	for (int32 I = 0; I < RouteNodes.Num(); ++I)
	{
		FAGX_CableRouteNode& Node = RouteNodes[I];
		FCableNodeBarrier NodeBarrier;

		switch (Node.NodeType)
		{
			case EAGX_CableNodeType::Free:
			{
				const FVector WorldLocation = Node.Frame.GetWorldLocation(*this);
				NodeBarrier.AllocateNativeFreeNode(WorldLocation);
				break;
			}
			case EAGX_CableNodeType::BodyFixed:
			{
				FRigidBodyBarrier* Body {nullptr};
				FTransform LocalTransform;
				std::tie(Body, LocalTransform) =
					AGX_CableComponent_helpers::GetBodyAndLocalTransform(
						Node, GetComponentTransform());
				if (Body == nullptr)
				{
					ErrorMessages.Add(FString::Printf(
						TEXT("Cable node at index %d has invalid body. Creating Free Node "
							 "instead of Body Fixed Node."),
						I));
					const FVector WorldLocation = Node.Frame.GetWorldLocation(*this);
					NodeBarrier.AllocateNativeFreeNode(WorldLocation);
					break;
				}
				NodeBarrier.AllocateNativeBodyFixedNode(
					*Body, LocalTransform, Node.LockRotationToBody);
				break;
			}
		}

		if (NodeBarrier.HasNative())
			NativeBarrier.Add(NodeBarrier);
	}

	if (ErrorMessages.Num() > 0)
	{
		FString Message = FString::Printf(
			TEXT("Errors detected during initialization of Cable '%s' in '%s':\n"), *GetName(),
			*GetLabelSafe(GetOwner()));
		for (const FString& Line : ErrorMessages)
		{
			Message += Line + '\n';
		}
		FAGX_NotificationUtilities::ShowNotification(Message, SNotificationItem::CS_Fail);
	}

	UpdateNativeProperties();
	UpdateNativeCableProperties();

	UAGX_Simulation* Simulation = UAGX_Simulation::GetFrom(this);
	if (Simulation == nullptr)
	{
		UE_LOG(
			LogAGX, Error,
			TEXT("Observer Frame Component '%s' in '%s' tried to get Simulation, but "
				 "UAGX_Simulation::GetFrom "
				 "returned nullptr."),
			*GetName(), *GetLabelSafe(GetOwner()));
		return;
	}

	Simulation->Add(*this);
}

#if WITH_EDITOR
bool UAGX_CableComponent::CanEditChange(const FProperty* InProperty) const
{
	const bool SuperCanEditChange = Super::CanEditChange(InProperty);
	if (!SuperCanEditChange)
		return false;

	if (InProperty == nullptr)
		return SuperCanEditChange;

	const bool bIsPlaying = GetWorld() && GetWorld()->IsGameWorld();
	if (bIsPlaying)
	{
		// List of names of properties that does not support editing after initialization.
		static const TArray<FName> PropertiesNotEditableDuringPlay = {
			GET_MEMBER_NAME_CHECKED(ThisClass, Radius),
			GET_MEMBER_NAME_CHECKED(ThisClass, SegmentLength),
			GET_MEMBER_NAME_CHECKED(ThisClass, RouteNodes)};

		if (PropertiesNotEditableDuringPlay.Contains(InProperty->GetFName()))
			return false;
	}

	return SuperCanEditChange;
}

void UAGX_CableComponent::InitPropertyDispatcher()
{
	FAGX_PropertyChangedDispatcher<ThisClass>& PropertyDispatcher =
		FAGX_PropertyChangedDispatcher<ThisClass>::Get();
	if (PropertyDispatcher.IsInitialized())
		return;

	PropertyDispatcher.Add(
		GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, CableProperties),
		[](ThisClass* Self) { Self->UpdateNativeCableProperties(); });
}

bool UAGX_CableComponent::DoesPropertyAffectVisuals(const FName& MemberPropertyName) const
{
	if (MemberPropertyName == GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, VisualCylinders))
		return true;

	if (MemberPropertyName == GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, VisualSpheres))
		return true;

	if (MemberPropertyName == GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, RouteNodes))
		return true;

	if (MemberPropertyName == GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, Radius))
		return true;

	if (MemberPropertyName == GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, RenderRadiusScale))
		return true;

	return false;
}

#endif // WITH_EDITOR

void UAGX_CableComponent::UpdateNativeProperties()
{
	if (!HasNative())
		return;

	NativeBarrier.SetName(!ImportName.IsEmpty() ? ImportName : GetName());
	NativeBarrier.AddCollisionGroups(CollisionGroups);
}

#if WITH_EDITOR
void UAGX_CableComponent::PostInitProperties()
{
	Super::PostInitProperties();
	InitPropertyDispatcher();

	if (!ObjectsReplacedDelegateHandle.IsValid())
	{
		ObjectsReplacedDelegateHandle = FCoreUObjectDelegates::OnObjectsReplaced.AddUObject(
			this, &UAGX_CableComponent::OnRouteNodeParentReplaced);
	}
}

void UAGX_CableComponent::PostEditChangeChainProperty(FPropertyChangedChainEvent& Event)
{
	FAGX_PropertyChangedDispatcher<ThisClass>::Get().Trigger(Event);

	FEditPropertyChain::TDoubleLinkedListNode* const PropertyNode = Event.PropertyChain.GetHead();
	if (PropertyNode != nullptr)
	{
		const FName Member = PropertyNode->GetValue()->GetFName();
		if (DoesPropertyAffectVisuals(Member))
			UpdateVisuals();

		if (Member == GET_MEMBER_NAME_CHECKED(UAGX_CableComponent, RouteNodes))
		{
			SynchronizeParentMovedCallbacks();
		}
	}

	Super::PostEditChangeChainProperty(Event);
}

void UAGX_CableComponent::PostLoad()
{
	Super::PostLoad();

	AGX_CableComponent_helpers::SetLocalScope(*this);

#if WITH_EDITOR
	if (GetWorld() != nullptr && !GetWorld()->IsGameWorld() && !HasAnyFlags(RF_ClassDefaultObject))
	{
		if (!MapLoadDelegateHandle.IsValid())
		{
			MapLoadDelegateHandle = FEditorDelegates::MapChange.AddWeakLambda(
				this,
				[this](uint32)
				{
					FEditorDelegates::MapChange.RemoveAll(this);
					SynchronizeParentMovedCallbacks();
					UpdateVisuals();
				});
		}
	}
#endif
}

void UAGX_CableComponent::OnRegister()
{
	Super::OnRegister();
	AGX_CableComponent_helpers::SetLocalScope(*this);

	if (VisualCylinders == nullptr || VisualSpheres == nullptr)
		CreateVisuals();

	UpdateVisuals();
}

void UAGX_CableComponent::SynchronizeParentMovedCallbacks()
{
	// Remove all old callbacks.
	for (TTuple<USceneComponent*, FParentDelegate>& ParentHandle : DelegateHandles)
	{
		if (ParentHandle.Value.Parent.IsValid())
			ParentHandle.Value.Parent->TransformUpdated.Remove(ParentHandle.Value.DelegateHandle);
	}

	DelegateHandles.Empty(RouteNodes.Num());

	// Add callbacks for the current parents.
	for (FAGX_CableRouteNode& RouteNode : RouteNodes)
	{
		USceneComponent* Parent = RouteNode.Frame.Parent.GetComponent<USceneComponent>();
		if (!IsValid(Parent) || DelegateHandles.Contains(Parent))
		{
			continue;
		}
		DelegateHandles.Add(
			Parent, {Parent, Parent->TransformUpdated.AddUObject(
								 this, &UAGX_CableComponent::OnRouteNodeParentMoved)});
	}
}

void UAGX_CableComponent::OnRouteNodeParentMoved(
	USceneComponent* Component, EUpdateTransformFlags UpdateTransformFlags, ETeleportType Teleport)
{
	// If this is a callback from a parent we are no longer a child of, then unsubscribe.
	FAGX_CableRouteNode* Node =
		RouteNodes.FindByPredicate([Component](const FAGX_CableRouteNode& Node)
								   { return Node.Frame.GetParentComponent() == Component; });
	if (Node == nullptr)
	{
		// Component is not the parent of any node, unsubscribe.
		const FParentDelegate* Handle = DelegateHandles.Find(Component);
		if (Handle != nullptr && Handle->Parent.IsValid())
		{
			Component->TransformUpdated.Remove(Handle->DelegateHandle);
			DelegateHandles.Remove(Component);
		}
		return;
	}

	// At least one Routing Node has the moved Component as its parent.
	UpdateVisuals();
}

void UAGX_CableComponent::OnRouteNodeParentReplaced(
	const FCoreUObjectDelegates::FReplacementObjectMap& /*OldToNew*/)
{
	SynchronizeParentMovedCallbacks();
	UpdateVisuals();
}
#endif // WITH_EDITOR

void UAGX_CableComponent::CreateVisuals()
{
	VisualCylinders =
		NewObject<UInstancedStaticMeshComponent>(this, FName(TEXT("VisualCylinders")));
	VisualCylinders->SetCanEverAffectNavigation(false);
	VisualCylinders->RegisterComponent();
	VisualCylinders->AttachToComponent(
		this, FAttachmentTransformRules::SnapToTargetNotIncludingScale);
	static const TCHAR* CylinderAssetPath =
		TEXT("StaticMesh'/AGXUnreal/Cable/SM_CableVisualCylinder.SM_CableVisualCylinder'");
	VisualCylinders->SetStaticMesh(
		FAGX_ObjectUtilities::GetAssetFromPath<UStaticMesh>(CylinderAssetPath));
	VisualCylinders->SetMaterial(0, RenderMaterial);

	VisualSpheres = NewObject<UInstancedStaticMeshComponent>(this, FName(TEXT("VisualSpheres")));
	VisualSpheres->SetCanEverAffectNavigation(false);
	VisualSpheres->RegisterComponent();
	VisualSpheres->AttachToComponent(
		this, FAttachmentTransformRules::SnapToTargetNotIncludingScale);
	static const TCHAR* SphereAssetPath =
		TEXT("StaticMesh'/AGXUnreal/Cable/SM_CableVisualSphere.SM_CableVisualSphere'");
	VisualSpheres->SetStaticMesh(
		FAGX_ObjectUtilities::GetAssetFromPath<UStaticMesh>(SphereAssetPath));
	VisualSpheres->SetMaterial(0, RenderMaterial);
}

bool UAGX_CableComponent::ShouldRenderSelf() const
{
	return VisualCylinders != nullptr && VisualSpheres != nullptr && ShouldRender();
}

void UAGX_CableComponent::UpdateVisuals()
{
	if (!ShouldRenderSelf())
	{
		const bool bHasVisualCylinders =
			VisualCylinders != nullptr && VisualCylinders->GetInstanceCount() > 0;
		const bool bHasVisualSpheres =
			VisualSpheres != nullptr && VisualSpheres->GetInstanceCount() > 0;

		if (bHasVisualCylinders || bHasVisualSpheres)
		{
			AGX_CableComponent_helpers::SetVisualsInstanceCount(*VisualCylinders, 0);
			AGX_CableComponent_helpers::SetVisualsInstanceCount(*VisualSpheres, 0);
		}

		return;
	}

	// Workaround, the RenderMaterial does not propagate properly in SetRenderMaterial() in
	// Blueprints, so we assign it here.
	if (VisualCylinders->GetMaterial(0) != RenderMaterial)
		VisualCylinders->SetMaterial(0, RenderMaterial);

	if (VisualSpheres->GetMaterial(0) != RenderMaterial)
		VisualSpheres->SetMaterial(0, RenderMaterial);

	RenderSelf();
}

namespace AGX_CableComponent_helpers
{
	TArray<FTransform> CreateCylinderMeshInstanceTransformsFromNodes(
		const TArray<FAGX_CableNodeInfo>& Nodes, double Radius)
	{
		TArray<FTransform> Result;

		// 0.01 because the mesh is 100 units large.
		// 2.0 to go from radius to diameter.
		const double ScaleXY = Radius * 0.01 * 2.0;
		const int32 NumSegments = Nodes.Num() - 1;
		Result.Reserve(NumSegments);

		auto AppendResult =
			[&ScaleXY, &Result](const FVector& StartLocation, const FVector& EndLocation)
		{
			const FVector MidPoint = (StartLocation + EndLocation) * 0.5;
			const FVector DeltaVec = EndLocation - StartLocation;
			const FRotator Rot = UKismetMathLibrary::MakeRotFromZ(DeltaVec);
			FTransform Curr;
			Curr.SetLocation(MidPoint);
			Curr.SetRotation(Rot.Quaternion());
			const auto Distance = (DeltaVec).Length();
			Curr.SetScale3D(FVector(ScaleXY, ScaleXY, Distance * 0.01));
			Result.Add(Curr);
		};

		for (int i = 0; i < NumSegments; i++)
		{
			const FVector StartLocation = Nodes[i].WorldTransform.GetLocation();
			const FVector EndLocation = Nodes[i + 1].WorldTransform.GetLocation();
			AppendResult(StartLocation, EndLocation);
		}

		return Result;
	}

	TArray<FTransform> CreateSphereMeshInstanceTransformsFromNodes(
		const TArray<FAGX_CableNodeInfo>& Nodes, double Radius)
	{
		TArray<FTransform> Result;

		// 0.01 because the mesh is 100 units large.
		// 2.0 to go from radius to diameter.
		const double ScaleXY = Radius * 0.01 * 2.0;
		FTransform SphereTransform {FTransform::Identity};
		SphereTransform.SetScale3D(FVector(ScaleXY, ScaleXY, ScaleXY));
		Result.Reserve(Nodes.Num());
		for (auto& N : Nodes)
		{
			SphereTransform.SetLocation(N.WorldTransform.GetLocation());
			Result.Add(SphereTransform);
		}

		return Result;
	}
}

void UAGX_CableComponent::RenderSelf()
{
	using namespace AGX_CableComponent_helpers;
	const TArray<FAGX_CableNodeInfo> Nodes = GetNodeInfo();
	if (Nodes.Num() <= 1)
		return;

	const double RenderRadius = Radius * RenderRadiusScale;

	// Visual Cylinders.
	{
		const TArray<FTransform> CylinderTransformsNew =
			CreateCylinderMeshInstanceTransformsFromNodes(Nodes, RenderRadius);
		SetVisualsInstanceCount(*VisualCylinders, CylinderTransformsNew.Num());
		if (VisualCylinderTransformsPrev.Num() != CylinderTransformsNew.Num())
			VisualCylinderTransformsPrev.SetNum(CylinderTransformsNew.Num());

		if (VisualCylinders->PerInstancePrevTransform.Num() != CylinderTransformsNew.Num())
			VisualCylinders->PerInstancePrevTransform.SetNum(CylinderTransformsNew.Num());

		VisualCylinders->UpdateComponentToWorld();
		VisualCylinders->BatchUpdateInstancesTransforms(
			0, CylinderTransformsNew, VisualCylinderTransformsPrev, /*bWorldSpace*/ true);
		VisualCylinderTransformsPrev = CylinderTransformsNew;
	}

	// Visual Spheres.
	{
		const TArray<FTransform> SphereTransformsNew =
			CreateSphereMeshInstanceTransformsFromNodes(Nodes, RenderRadius);
		SetVisualsInstanceCount(*VisualSpheres, SphereTransformsNew.Num());
		if (VisualSphereTransformsPrev.Num() != SphereTransformsNew.Num())
			VisualSphereTransformsPrev.SetNum(SphereTransformsNew.Num());

		if (VisualSpheres->PerInstancePrevTransform.Num() != SphereTransformsNew.Num())
			VisualSpheres->PerInstancePrevTransform.SetNum(SphereTransformsNew.Num());

		VisualSpheres->UpdateComponentToWorld();
		VisualSpheres->BatchUpdateInstancesTransforms(
			0, SphereTransformsNew, VisualSphereTransformsPrev, /*bWorldSpace*/ true);
		VisualSphereTransformsPrev = SphereTransformsNew;
	}
}

bool UAGX_CableComponent::UpdateNativeCableProperties()
{
	if (!HasNative())
		return false;

	if (CableProperties == nullptr)
	{
		if (HasNative())
			GetNative()->SetCablePropertiesToDefault();

		return true;
	}

	UWorld* World = GetWorld();
	UAGX_CableProperties* Instance =
		static_cast<UAGX_CableProperties*>(CableProperties->GetOrCreateInstance(World));
	check(Instance);

	if (CableProperties != Instance)
		CableProperties = Instance;

	FCablePropertiesBarrier* MaterialBarrier = Instance->GetOrCreateNative();
	check(MaterialBarrier);
	GetNative()->SetCableProperties(*MaterialBarrier);
	return true;
}
