#pragma once

#include <QMap>
#include <QSet>
#include <QVector>

#include <QtCore/QJsonObject>
#include <QtCore/QObject>
#include <QtCore/QVariant>
#include <QUuid>

#include "global.h"


/**
 * The central class in the Model-View approach. It delivers all kinds
 * of information from the backing user data structures that represent
 * the graph. The class allows to modify the graph structure: create
 * and remove nodes and connections.
 *
 * We use two types of the unique ids for graph manipulations:
 *   - NodeId
 *   - ConnectionId
 */
class BaseModel : public QObject
{
    Q_OBJECT
    /// @brief Returns node-related data for requested NodeRole.
    /**
   * @returns Node Caption, Node Caption Visibility, Node Position etc.
   */
    virtual QVariant nodeData(QUuid nodeId, NodeRole role) const = 0;

    /**
   * A utility function that unwraps the `QVariant` value returned from the
   * standard `QVariant AbstractGraphModel::nodeData(NodeId, NodeRole)` function.
   */
    template<typename T>
    T nodeData(QUuid nodeId, NodeRole role) const
    {
        return nodeData(nodeId, role).value<T>();
    }

    virtual NodeFlags nodeFlags(NodeId nodeId) const
    {
        Q_UNUSED(nodeId);
        return NodeFlag::NoFlags;
    }
};