#pragma once


#include <QtWidgets/QWidget>
#include <QDebug>
#include <QThread>

#include "PortType.hpp"
#include "NodeData.hpp"
#include "Serializable.hpp"
#include "NodeGeometry.hpp"
#include "NodeStyle.hpp"
#include "NodePainterDelegate.hpp"
#include "Export.hpp"
#include "memory.hpp"

namespace QtNodes
{

	enum class NodeValidationState
	{
		Valid,
		Warning,
		Error
	};

	class Connection;

	class StyleCollection;

	class NodeDataModel
		: public QObject,
		//public QThread,
		public Serializable
	{
		Q_OBJECT

	public:

		NodeDataModel();

		virtual
			~NodeDataModel() = default;

		/// Caption is used in GUI
		virtual QString
			caption() const = 0;

		/// It is possible to hide caption in GUI
		virtual bool
			captionVisible() const { return true; }

		/// Port caption is used in GUI to label individual ports
		virtual QString
			portCaption(PortType, PortIndex) const { return QString(); }

		/// It is possible to hide port caption in GUI
		virtual bool
			portCaptionVisible(PortType, PortIndex) const { return false; }

		/// Name makes this model unique
		virtual QString
			name() const = 0;

	public:

		QJsonObject
			save() const override;

	public:
		/**
		 * \brief 定义该节点有几个输入输出端口
		 * \param portType 查询的端口类型
		 * \return 返回查询类型的端口个数
		 */
		virtual
			unsigned int nPorts(PortType portType) const = 0;

		virtual
			NodeDataType dataType(PortType portType, PortIndex portIndex) const = 0;

	public:

		enum class ConnectionPolicy
		{
			One,
			Many,
		};

		virtual
			ConnectionPolicy
			portOutConnectionPolicy(PortIndex) const
		{
			return ConnectionPolicy::Many;
		}

		virtual
			ConnectionPolicy
			portInConnectionPolicy(PortIndex) const
		{
			return ConnectionPolicy::One;
		}

		NodeStyle const&
			nodeStyle() const;

		void
			setNodeStyle(NodeStyle const& style);

	public:

		/// Triggers the algorithm
		virtual
			void
			setInData(std::shared_ptr<NodeData> nodeData,
				PortIndex port) = 0;

		// Use this if portInConnectionPolicy returns ConnectionPolicy::Many
		virtual
			void
			setInData(std::shared_ptr<NodeData> nodeData,
				PortIndex port,
				const QUuid& connectionId)
		{
			Q_UNUSED(connectionId);
			setInData(nodeData, port);
		}

		virtual
			std::shared_ptr<NodeData>
			outData(PortIndex port) = 0;

		/**
		 * It is recommented to preform a lazy initialization for the
		 * embedded widget and create it inside this function, not in the
		 * constructor of the current model.
		 *
		 * Our Model Registry is able to shortly instantiate models in order
		 * to call the non-static `Model::name()`. If the embedded widget is
		 * allocated in the constructor but not actually embedded into some
		 * QGraphicsProxyWidget, we'll gonna have a dangling pointer.
		 */
		virtual
			QWidget*
			embeddedWidget() = 0;

		virtual
			bool
			resizable() const { return false; }

		virtual
			NodeValidationState
			validationState() const { return NodeValidationState::Valid; }

		virtual
			QString
			validationMessage() const { return QString(""); }

		virtual
			NodePainterDelegate* painterDelegate() const { return nullptr; }

	public Q_SLOTS:

		virtual void
			inputConnectionCreated(Connection const&)
		{
		}

		virtual void
			inputConnectionDeleted(Connection const&)
		{
			//qDebug() << "inputConnectionDeleted";
			//emit sigInputConnectionDeleted();
		}

		virtual void
			outputConnectionCreated(Connection const&)
		{
		}

		virtual void
			outputConnectionDeleted(Connection const&)
		{
		}

	Q_SIGNALS:

		/// Triggers the updates in the nodes downstream.
		void dataUpdated(PortIndex index);

		/// Triggers the propagation of the empty data downstream.
		void dataInvalidated(PortIndex index);

		void computingStarted();

		void computingFinished();

		void embeddedWidgetSizeUpdated();

		void sigInputConnectionDeleted();//输入连接移出信号

	private:

		NodeStyle _nodeStyle;
	};
}