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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
**     the names of its contributors may be used to endorse or promote
**     products derived from this software without specific prior written
**     permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
** $QT_END_LICENSE$
**
****************************************************************************/

#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