/****************************************************************************

**

** 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.

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#include <QtGui>

#include <QtNetwork>

#include "dialog.h"

#if !defined(Q_OS_WINCE) && !defined(Q_OS_SYMBIAN)

static const int TotalBytes = 50 * 1024 * 1024;

#else

static const int TotalBytes = 5 * 1024 * 1024;

#endif

static const int PayloadSize = 64 * 1024; // 64 KB

Dialog::Dialog(QWidget *parent)

    : QDialog(parent)

{

    clientProgressBar = new QProgressBar;

    clientStatusLabel = new QLabel(tr("Client ready"));

    serverProgressBar = new QProgressBar;

    serverStatusLabel = new QLabel(tr("Server ready"));

    startButton = new QPushButton(tr("&Start"));

    quitButton = new QPushButton(tr("&Quit"));

    buttonBox = new QDialogButtonBox;

    buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);

    buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

    connect(startButton, SIGNAL(clicked()), this, SLOT(start()));

    connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

    connect(&tcpServer, SIGNAL(newConnection()),

            this, SLOT(acceptConnection()));

    connect(&tcpClient, SIGNAL(connected()), this, SLOT(startTransfer()));

    connect(&tcpClient, SIGNAL(bytesWritten(qint64)),

            this, SLOT(updateClientProgress(qint64)));

    connect(&tcpClient, SIGNAL(error(QAbstractSocket::SocketError)),

            this, SLOT(displayError(QAbstractSocket::SocketError)));

    QVBoxLayout *mainLayout = new QVBoxLayout;

    mainLayout->addWidget(clientProgressBar);

    mainLayout->addWidget(clientStatusLabel);

    mainLayout->addWidget(serverProgressBar);

    mainLayout->addWidget(serverStatusLabel);

    mainLayout->addStretch(1);

    mainLayout->addSpacing(10);

    mainLayout->addWidget(buttonBox);

    setLayout(mainLayout);

    setWindowTitle(tr("Loopback"));

}

void Dialog::start()

{

    startButton->setEnabled(false);

#ifndef QT_NO_CURSOR

    QApplication::setOverrideCursor(Qt::WaitCursor);

#endif

    bytesWritten = 0;

    bytesReceived = 0;

    while (!tcpServer.isListening() && !tcpServer.listen()) {

        QMessageBox::StandardButton ret = QMessageBox::critical(this,

                                        tr("Loopback"),

                                        tr("Unable to start the test: %1.")

					.arg(tcpServer.errorString()),

                                        QMessageBox::Retry

					| QMessageBox::Cancel);

        if (ret == QMessageBox::Cancel)

            return;

    }

    serverStatusLabel->setText(tr("Listening"));

    clientStatusLabel->setText(tr("Connecting"));

    tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());

}

void Dialog::acceptConnection()

{

    tcpServerConnection = tcpServer.nextPendingConnection();

    connect(tcpServerConnection, SIGNAL(readyRead()),

            this, SLOT(updateServerProgress()));

    connect(tcpServerConnection, SIGNAL(error(QAbstractSocket::SocketError)),

            this, SLOT(displayError(QAbstractSocket::SocketError)));

    serverStatusLabel->setText(tr("Accepted connection"));

    tcpServer.close();

}

void Dialog::startTransfer()

{

    // called when the TCP client connected to the loopback server

    bytesToWrite = TotalBytes - (int)tcpClient.write(QByteArray(PayloadSize, '@'));

    clientStatusLabel->setText(tr("Connected"));

}

void Dialog::updateServerProgress()

{

    bytesReceived += (int)tcpServerConnection->bytesAvailable();

    tcpServerConnection->readAll();

    serverProgressBar->setMaximum(TotalBytes);

    serverProgressBar->setValue(bytesReceived);

    serverStatusLabel->setText(tr("Received %1MB")

                               .arg(bytesReceived / (1024 * 1024)));

    if (bytesReceived == TotalBytes) {

        tcpServerConnection->close();

        startButton->setEnabled(true);

#ifndef QT_NO_CURSOR

        QApplication::restoreOverrideCursor();

#endif

    }

}

void Dialog::updateClientProgress(qint64 numBytes)

{

    // callen when the TCP client has written some bytes

    bytesWritten += (int)numBytes;

    // only write more if not finished and when the Qt write buffer is below a certain size.

    if (bytesToWrite > 0 && tcpClient.bytesToWrite() <= 4*PayloadSize)

        bytesToWrite -= (int)tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), '@'));

    clientProgressBar->setMaximum(TotalBytes);

    clientProgressBar->setValue(bytesWritten);

    clientStatusLabel->setText(tr("Sent %1MB")

                               .arg(bytesWritten / (1024 * 1024)));

}

void Dialog::displayError(QAbstractSocket::SocketError socketError)

{

    if (socketError == QTcpSocket::RemoteHostClosedError)

        return;

    QMessageBox::information(this, tr("Network error"),

                             tr("The following error occurred: %1.")

                             .arg(tcpClient.errorString()));

    tcpClient.close();

    tcpServer.close();

    clientProgressBar->reset();

    serverProgressBar->reset();

    clientStatusLabel->setText(tr("Client ready"));

    serverStatusLabel->setText(tr("Server ready"));

    startButton->setEnabled(true);

#ifndef QT_NO_CURSOR

    QApplication::restoreOverrideCursor();

#endif

}