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+//
+// Copyright (C) 2017 James Turner  zakalawe@mac.com
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation; either version 2 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+
+#ifndef CANVASCONNECTION_H
+#define CANVASCONNECTION_H
+
+#include <memory>
+
+#include <QObject>
+#include <QtWebSockets/QWebSocket>
+#include <QJsonObject>
+#include <QUrl>
+#include <QRectF>
+#include <QPointer>
+#include <QTimer>
+
+class LocalProp;
+class QNetworkAccessManager;
+class FGQCanvasImageLoader;
+class FGQCanvasFontCache;
+class QDataStream;
+
+class CanvasConnection : public QObject
+{
+    Q_OBJECT
+
+    Q_ENUMS(Status)
+
+    Q_PROPERTY(Status status READ status NOTIFY statusChanged)
+
+// QML exposed versions of the destination rect
+    Q_PROPERTY(QPointF origin READ origin WRITE setOrigin NOTIFY geometryChanged)
+    Q_PROPERTY(QSizeF size READ size WRITE setSize NOTIFY geometryChanged)
+
+    Q_PROPERTY(int windowIndex READ windowIndex WRITE setWindowIndex NOTIFY geometryChanged)
+
+    Q_PROPERTY(QUrl webSocketUrl READ webSocketUrl NOTIFY webSocketUrlChanged)
+    Q_PROPERTY(QString rootPath READ rootPath NOTIFY rootPathChanged)
+public:
+    explicit CanvasConnection(QObject *parent = nullptr);
+    ~CanvasConnection();
+
+    void setNetworkAccess(QNetworkAccessManager *dl);
+    void setRootPropertyPath(QByteArray path);
+
+    void setAutoReconnect();
+
+    enum Status
+    {
+        NotConnected,
+        Connecting,
+        Connected,
+        Closed,
+        Reconnecting,
+        Error,
+        Snapshot  // offline mode, data from snapshot
+    };
+
+    Status status() const
+    {
+        return m_status;
+    }
+
+    QJsonObject saveState() const;
+    bool restoreState(QJsonObject state);
+
+    void saveSnapshot(QDataStream& ds) const;
+    void restoreSnapshot(QDataStream &ds);
+
+    void connectWebSocket(QByteArray hostName, int port);
+    QPointF origin() const;
+
+    QSizeF size() const;
+
+    int windowIndex() const
+    {
+        return m_windowIndex;
+    }
+
+    void setWindowIndex(int index);
+
+    LocalProp* propertyRoot() const;
+
+    QUrl webSocketUrl() const
+    {
+        return m_webSocketUrl;
+    }
+
+    QString rootPath() const
+    {
+        return QString::fromUtf8(m_rootPropertyPath);
+    }
+
+    FGQCanvasImageLoader* imageLoader() const;
+
+    FGQCanvasFontCache* fontCache() const;
+
+public Q_SLOTS:
+    void reconnect();
+
+    // not on iOS / Android - requires widgets
+    void showDebugTree();
+
+    void setOrigin(QPointF center);
+
+    void setSize(QSizeF size);
+
+signals:
+    void statusChanged(Status status);
+
+    void geometryChanged();
+
+    void rootPathChanged();
+
+    void webSocketUrlChanged();
+
+    void updated();
+private Q_SLOTS:
+    void onWebSocketConnected();
+    void onTextMessageReceived(QString message);
+    void onWebSocketClosed();
+
+private:
+    void setStatus(Status newStatus);
+    LocalProp *propertyFromPath(QByteArray path) const;
+
+    QUrl m_webSocketUrl;
+    QByteArray m_rootPropertyPath;
+    QRectF m_destRect;
+    int m_windowIndex = 0;
+
+    QWebSocket m_webSocket;
+    QNetworkAccessManager* m_netAccess = nullptr;
+    QTimer* m_reconnectTimer = nullptr;
+    bool m_autoReconnect = false;
+
+    std::unique_ptr<LocalProp> m_localPropertyRoot;
+    QHash<int, QPointer<LocalProp>> idPropertyDict;
+    Status m_status = NotConnected;
+
+    mutable FGQCanvasImageLoader* m_imageLoader = nullptr;
+    mutable FGQCanvasFontCache* m_fontCache = nullptr;
+};
+
+#endif // CANVASCONNECTION_H