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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef CONNECTION_H
#define CONNECTION_H

#include <QHostAddress>
#include <QString>
#include <QTcpSocket>
#include <QTime>
#include <QTimer>

static const int MaxBufferSize = 1024000;

class Connection : public QTcpSocket
{
    Q_OBJECT

public:
    enum ConnectionState {
        WaitingForGreeting,
        ReadingGreeting,
        ReadyForUse
    };
    enum DataType {
        PlainText,
        Ping,
        Pong,
        Greeting,
        Undefined
    };

    Connection(QObject *parent = 0);

    QString name() const;
    void setGreetingMessage(const QString &message);
    bool sendMessage(const QString &message);

signals:
    void readyForUse();
    void newMessage(const QString &from, const QString &message);

protected:
    void timerEvent(QTimerEvent *timerEvent);

private slots:
    void processReadyRead();
    void sendPing();
    void sendGreetingMessage();

private:
    int readDataIntoBuffer(int maxSize = MaxBufferSize);
    int dataLengthForCurrentDataType();
    bool readProtocolHeader();
    bool hasEnoughData();
    void processData();

    QString greetingMessage;
    QString username;
    QTimer pingTimer;
    QTime pongTime;
    QByteArray buffer;
    ConnectionState state;
    DataType currentDataType;
    int numBytesForCurrentDataType;
    int transferTimerId;
    bool isGreetingMessageSent;
};

#endif