// Fill out your copyright notice in the Description page of Project Settings.

#include "DialogueAssetEditor.h"
#include "DialogueGraph.h"
#include "DialogueGraphSchema.h"
#include "DialogueEditorMode.h"
#include "DialogueGraphPanelNodeFactory.h"
#include "DialogueGraphPanelPinFactory.h"
#include "EdGraphUtilities.h"
#include "Kismet2/BlueprintEditorUtils.h"
#include "GraphEditorActions.h"
#include "Framework/Commands/GenericCommands.h"
#include "IDetailsView.h"
#include "Node/DialogueGraphNode_Base.h"
#include "Node/DialogueGraphNode_NPC.h"
#include "Node/DialogueGraphNode_Player.h"
#include "Node/DialogueGraphNode_Root.h"

#define LOCTEXT_NAMESPACE "DialogueEditorToolkit"

const FName DialogueEditorAppName = FName(TEXT("DialogueEditorApp"));

void FDialogueAssetEditor::OnClose()
{
	SaveGraphData();
	DialogueBeingEdited->SetPreSaveListener(nullptr);
	FWorkflowCentricApplication::OnClose();
}

FDialogueAssetEditor::FDialogueAssetEditor()
	: DialogueGraph(nullptr)
{
}

FDialogueAssetEditor::~FDialogueAssetEditor()
{
}

FText FDialogueAssetEditor::GetBaseToolkitName() const
{
	return IsValid(DialogueBeingEdited) ? FText::FromString(DialogueBeingEdited->GetName()) : LOCTEXT("AppLabel", "Dialogue Editor");
}



void FDialogueAssetEditor::InitDialogueEditor(const EToolkitMode::Type Mode,
	const TSharedPtr<IToolkitHost>& InitToolkitHost, TObjectPtr<UDialogueAsset> InitDialogueAsset)
{
	DialogueBeingEdited = InitDialogueAsset;
	//修改过程中保存
	DialogueBeingEdited->SetPreSaveListener([this] () { SaveGraphData();; });
	// 注册命令
	FGenericCommands::Register();
	FGraphEditorCommands::Register();
	BindGraphCommands();

	//注册节点的创建
	FEdGraphUtilities::RegisterVisualNodeFactory(MakeShareable(new FDialogueGraphPanelNodeFactory()));
	FEdGraphUtilities::RegisterVisualPinFactory(MakeShareable(new FDialogueGraphPanelPinFactory()));
	
	// 创建图表
	DialogueGraph = FBlueprintEditorUtils::CreateNewGraph(
		DialogueBeingEdited.Get(),
		NAME_None,
		UDialogueGraph::StaticClass(),
		UDialogueGraphSchema::StaticClass()
	);

	TArray<UObject*> ObjectsToEdit;
	ObjectsToEdit.Add(InitDialogueAsset);
	
	// 初始化编辑器
	InitAssetEditor(
		Mode,
		InitToolkitHost,
		DialogueEditorAppName,
		FTabManager::FLayout::NullLayout,
		true,
		true,
		ObjectsToEdit
	);

	// 添加应用模式
	AddApplicationMode(TEXT("DialogueEditorMode"), MakeShareable(new FDialogueEditorMode(SharedThis(this))));
	SetCurrentMode(TEXT("DialogueEditorMode"));

	//加载资源中的数据节点
	LoadGraphData();
}

void FDialogueAssetEditor::SetDetailsView(TSharedPtr<IDetailsView> InDetailsView)
{
	DetailsView = InDetailsView;
	if (DetailsView.IsValid())
	{
		DetailsView->OnFinishedChangingProperties().AddSP(this, &FDialogueAssetEditor::OnNodeDetailViewPropertiesUpdated);
	}
}

void FDialogueAssetEditor::OnGraphSelectionChanged(const FGraphPanelSelectionSet& Selection)
{
	if (!DetailsView.IsValid())
		return;

	if (UDialogueGraphNode_Base* SelectedNode = GetSelectedNode(Selection))
	{
		DetailsView->SetObject(SelectedNode->GetDialogueNodeData());
	}
	else
	{
		DetailsView->SetObject(nullptr);
	}
}

void FDialogueAssetEditor::SaveGraphData()
{
	if (!DialogueBeingEdited || !DialogueGraph)
	{
		return;
	}
	

	TArray<std::pair<FGuid, FGuid>> Connections;
	TMap<FGuid, UDialogueRuntimePin*> IdToPinMap;
	DialogueBeingEdited->NodeDatas.Empty();
	for (UEdGraphNode* EditorNode : DialogueGraph->Nodes)
	{
		UDialogueRuntimeNode* RuntimeNode = NewObject<UDialogueRuntimeNode>(DialogueBeingEdited);
		RuntimeNode->Position = FVector2D(EditorNode->NodePosX, EditorNode->NodePosY);

		for (UEdGraphPin* EditorPin : EditorNode->Pins)
		{
			UDialogueRuntimePin* RuntimePin = NewObject<UDialogueRuntimePin>(RuntimeNode);
			RuntimePin->PinName = EditorPin->PinName;
			RuntimePin->PinId = EditorPin->PinId;
			RuntimePin->Parent = RuntimeNode;
			RuntimePin->Direction = EditorPin->Direction;
			
			if (EditorPin->HasAnyConnections())
			{
				std::pair<FGuid, FGuid> Connection = std::make_pair(EditorPin->PinId, EditorPin->LinkedTo[0]->PinId);
				Connections.Add(Connection);
			}

			IdToPinMap.Add(EditorPin->PinId, RuntimePin);
			if (RuntimePin->Direction == EGPD_Input)
			{
				RuntimeNode->InputPin = RuntimePin;
			}
			else
			{
				RuntimeNode->OutputPins.Add(RuntimePin);
			}
		}
		UDialogueGraphNode_Base* EditorDialogueNode = Cast<UDialogueGraphNode_Base>(EditorNode);
		RuntimeNode->NodeData = DuplicateObject(EditorDialogueNode->GetDialogueNodeData(), DialogueBeingEdited);
		RuntimeNode->NodeType = EditorDialogueNode->GetDialogueNodeType();

		DialogueBeingEdited->NodeDatas.Add(RuntimeNode);
		
	}

	for (std::pair<FGuid, FGuid> Connection : Connections)
	{
		UDialogueRuntimePin* Pin1 = IdToPinMap[Connection.first];
		UDialogueRuntimePin* Pin2 = IdToPinMap[Connection.second];
		if (!Pin1->Connections.Contains(Pin2))
		{
			Pin1->Connections.Add(Pin2);
			if (Pin1->Direction == EGPD_Input)
			{
				if (!Pin2->Connections.Contains(Pin1))
				{
					Pin2->Connections.Add(Pin1);
				}
			}
		}
	}
	//标记数据更新
	DialogueBeingEdited->Modify();
}

void FDialogueAssetEditor::LoadGraphData()
{
	if (DialogueBeingEdited->NodeDatas.Num() == 0)
	{
		//空节点，创建默认Root节点
		DialogueGraph->GetSchema()->CreateDefaultNodesForGraph(*DialogueGraph);
		UDialogueRuntimeNode* RootNode = NewObject<UDialogueRuntimeNode>();
		RootNode->NodeType = EDialogueNodeType::Root;
		return;
	}
	//读取节点信息，创建pin及连线
	TArray<std::pair<FGuid, FGuid>> Connections;
	TMap<FGuid, UEdGraphPin*> IdToPinMap;
	for (UDialogueRuntimeNode* RuntimeNode: DialogueBeingEdited->NodeDatas)
	{
		UDialogueGraphNode_Base* EditorNode = nullptr;
		switch (RuntimeNode->NodeType)
		{
		case EDialogueNodeType::Root:
			EditorNode = NewObject<UDialogueGraphNode_Root>(DialogueGraph);
			break;
		case EDialogueNodeType::NPC:
			EditorNode = NewObject<UDialogueGraphNode_NPC>(DialogueGraph);
			break;
		case EDialogueNodeType::Player:
			EditorNode = NewObject<UDialogueGraphNode_Player>(DialogueGraph);
			break;
		default: ;
			continue;
		}

		EditorNode->CreateNewGuid();
		EditorNode->SetPostion(RuntimeNode->Position);
		if (RuntimeNode->NodeData)
		{
			EditorNode->SetDialogueNodeData(DuplicateObject(RuntimeNode->NodeData, EditorNode));
		}
		else
		{
			EditorNode->InitializeNodeData();
		}

		if (RuntimeNode->InputPin)
		{
			UDialogueRuntimePin* InputPin = RuntimeNode->InputPin;
			FName Category = TEXT("Inputs");
			UEdGraphPin* EditorPin = EditorNode->CreatePin((EEdGraphPinDirection)InputPin->Direction, Category, InputPin->PinName);
			EditorPin->PinId = InputPin->PinId;

			if (InputPin->Connections.Num() > 0)
			{
				Connections.Add(std::make_pair(InputPin->PinId, InputPin->Connections[0]->PinId));
			}
			IdToPinMap.Add(InputPin->PinId, EditorPin);
		}

		for (UDialogueRuntimePin* RuntimePin : RuntimeNode->OutputPins)
		{
			FName Category = TEXT("Outputs");
			UEdGraphPin* EditorPin = EditorNode->CreatePin((EEdGraphPinDirection)RuntimePin->Direction, Category, RuntimePin->PinName);
			EditorPin->PinId = RuntimePin->PinId;

			if (RuntimePin->Connections.Num() > 0)
			{
				Connections.Add(std::make_pair(RuntimePin->PinId, RuntimePin->Connections[0]->PinId));
			}
			IdToPinMap.Add(RuntimePin->PinId, EditorPin);
		}
		DialogueGraph->AddNode(EditorNode, true, true);
	}
	for (std::pair<FGuid, FGuid> Connection : Connections)
	{
		UEdGraphPin* FromPin = IdToPinMap[Connection.first];
		UEdGraphPin* ToPin = IdToPinMap[Connection.second];
		FromPin->LinkedTo.Add(ToPin);
		ToPin->LinkedTo.Add(FromPin);
	}
	
}

void FDialogueAssetEditor::BindGraphCommands()
{
	ToolkitCommands->MapAction(FGenericCommands::Get().Delete,
		FExecuteAction::CreateSP(this, &FDialogueAssetEditor::DeleteSelectedNodes),
		FCanExecuteAction::CreateSP(this, &FDialogueAssetEditor::CanDeleteNodes));
}

void FDialogueAssetEditor::DeleteSelectedNodes()
{
	if (!GraphEditor.IsValid())
		return;

	const FScopedTransaction Transaction(FGenericCommands::Get().Delete->GetDescription());
	GraphEditor->GetCurrentGraph()->Modify();

	const FGraphPanelSelectionSet SelectedNodes = GraphEditor->GetSelectedNodes();
	GraphEditor->ClearSelectionSet();

	for (FGraphPanelSelectionSet::TConstIterator NodeIt(SelectedNodes); NodeIt; ++NodeIt)
	{
		
		UEdGraphNode* EdNode = Cast<UEdGraphNode>(*NodeIt);
		if (EdNode == nullptr || !EdNode->CanUserDeleteNode())
			continue;;

		if (UDialogueGraphNode_Base* EdNode_Node = Cast<UDialogueGraphNode_Base>(EdNode))
		{
			EdNode_Node->Modify();

			const UEdGraphSchema* Schema = EdNode_Node->GetSchema();
			if (Schema != nullptr)
			{
				Schema->BreakNodeLinks(*EdNode_Node);
			}

			EdNode_Node->DestroyNode();
		}
		else
		{
			EdNode->Modify();
			EdNode->DestroyNode();
		}
	}
}

bool FDialogueAssetEditor::CanDeleteNodes()
{
	if (!GraphEditor.IsValid())
		return false;

	const FGraphPanelSelectionSet SelectedNodes = GraphEditor->GetSelectedNodes();
	for (FGraphPanelSelectionSet::TConstIterator SelectedIter(SelectedNodes); SelectedIter; ++SelectedIter)
	{
		UEdGraphNode* Node = Cast<UEdGraphNode>(*SelectedIter);
		if (Node && Node->CanUserDeleteNode())
		{
			return true;
		}
	}
	return false;
}

UDialogueGraphNode_Base* FDialogueAssetEditor::GetSelectedNode(const FGraphPanelSelectionSet& Selection)
{
	for (UObject* Obj : Selection)
	{
		if (UDialogueGraphNode_Base* Node = Cast<UDialogueGraphNode_Base>(Obj))
		{
			return Node;
		}
	}
	return nullptr;
}

void FDialogueAssetEditor::OnNodeDetailViewPropertiesUpdated(const FPropertyChangedEvent& Event)
{
	if (GraphEditor.IsValid())
	{
		GraphEditor->NotifyGraphChanged();
	}
}

#undef LOCTEXT_NAMESPACE