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 // The MIT License (MIT)
 //
 // Copyright (c) Itay Grudev 2015 - 2020
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
 // in the Software without restriction, including without limitation the rights
 // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 // copies of the Software, and to permit persons to whom the Software is
 // furnished to do so, subject to the following conditions:
 //
 // The above copyright notice and this permission notice shall be included in
 // all copies or substantial portions of the Software.
 //
 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
 //
 //  W A R N I N G !!!
 //  -----------------
 //
 // This file is not part of the SingleApplication API. It is used purely as an
 // implementation detail. This header file may change from version to
 // version without notice, or may even be removed.
 //
 
 #pragma once
 
 #include <QtCore/QSharedMemory>
 #include <QtNetwork/QLocalServer>
 #include <QtNetwork/QLocalSocket>
 #include "singleapplication.h"
 
 struct InstancesInfo {
     bool primary;
     quint32 secondary;
     qint64 primaryPid;
     char primaryUser[128];
     quint16 checksum; // Must be the last field
 };
 
 struct ConnectionInfo {
     qint64 msgLen = 0;
     quint32 instanceId = 0;
     quint8 stage = 0;
 };
 
 class SingleApplicationPrivate : public QObject {
 Q_OBJECT
 public:
     enum ConnectionType : quint8 {
         InvalidConnection = 0,
         NewInstance = 1,
         SecondaryInstance = 2,
         Reconnect = 3
     };
     enum ConnectionStage : quint8 {
         StageInitHeader = 0,
         StageInitBody = 1,
         StageConnectedHeader = 2,
         StageConnectedBody = 3,
     };
     Q_DECLARE_PUBLIC(SingleApplication)
 
     SingleApplicationPrivate( SingleApplication *q_ptr );
     ~SingleApplicationPrivate() override;
 
     static QString getUsername();
     void genBlockServerName();
     void initializeMemoryBlock() const;
     void startPrimary();
     void startSecondary();
     bool connectToPrimary( int msecs, ConnectionType connectionType );
     quint16 blockChecksum() const;
     qint64 primaryPid() const;
     QString primaryUser() const;
     bool isFrameComplete(QLocalSocket *sock);
     void readMessageHeader(QLocalSocket *socket, ConnectionStage nextStage);
     void readInitMessageBody(QLocalSocket *socket);
     void writeAck(QLocalSocket *sock);
     bool writeConfirmedFrame(int msecs, const QByteArray &msg);
     bool writeConfirmedMessage(int msecs, const QByteArray &msg, SingleApplication::SendMode sendMode = SingleApplication::NonBlocking);
     static void randomSleep();
     void addAppData(const QString &data);
     QStringList appData() const;
 
     SingleApplication *q_ptr;
     QSharedMemory *memory;
     QLocalSocket *socket;
     QLocalServer *server;
     quint32 instanceNumber;
     QString blockServerName;
     SingleApplication::Options options;
     QMap<QLocalSocket*, ConnectionInfo> connectionMap;
     QStringList appDataList;
 
 public Q_SLOTS:
     void slotConnectionEstablished();
     void slotDataAvailable( QLocalSocket*, quint32 );
     void slotClientConnectionClosed( QLocalSocket*, quint32 );
 };