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#include <QtTest/QtTest>

#include <QtCore/QCoreApplication>

#include <QtCore/QSocketNotifier>

#include <QtNetwork/QTcpServer>

#include <QtNetwork/QTcpSocket>

#include <private/qnativesocketengine_p.h>

class tst_QSocketNotifier : public QObject

{

    Q_OBJECT

public:

    tst_QSocketNotifier();

    ~tst_QSocketNotifier();

private slots:

    void unexpectedDisconnection();

    void mixingWithTimers();

};

tst_QSocketNotifier::tst_QSocketNotifier()

{ }

tst_QSocketNotifier::~tst_QSocketNotifier()

{

}

class UnexpectedDisconnectTester : public QObject

{

    Q_OBJECT

public:

    QNativeSocketEngine *readEnd1, *readEnd2;

    int sequence;

    UnexpectedDisconnectTester(QNativeSocketEngine *s1, QNativeSocketEngine *s2)

        : readEnd1(s1), readEnd2(s2), sequence(0)

    {

        QSocketNotifier *notifier1 =

            new QSocketNotifier(readEnd1->socketDescriptor(), QSocketNotifier::Read, this);

        connect(notifier1, SIGNAL(activated(int)), SLOT(handleActivated()));

        QSocketNotifier *notifier2 =

            new QSocketNotifier(readEnd2->socketDescriptor(), QSocketNotifier::Read, this);

        connect(notifier2, SIGNAL(activated(int)), SLOT(handleActivated()));

    }

public slots:

    void handleActivated()

    {

        char data1[1], data2[1];

        ++sequence;

        if (sequence == 1) {

            // read from both ends

            (void) readEnd1->read(data1, sizeof(data1));

            (void) readEnd2->read(data2, sizeof(data2));

            emit finished();

        } else if (sequence == 2) {

            // we should never get here

            QCOMPARE(readEnd2->read(data2, sizeof(data2)), qint64(-2));

            QVERIFY(readEnd2->isValid());

        }

    }

signals:

    void finished();

};

void tst_QSocketNotifier::unexpectedDisconnection()

{

    /*

      Given two sockets and two QSocketNotifiers registered on each

      their socket. If both sockets receive data, and the first slot

      invoked by one of the socket notifiers empties both sockets, the

      other notifier will also emit activated(). This results in

      unexpected disconnection in QAbstractSocket.

      The use case is that somebody calls one of the

      waitFor... functions in a QSocketNotifier activated slot, and

      the waitFor... functions do local selects that can empty both

      stdin and stderr while waiting for fex bytes to be written.

    */

    QTcpServer server;

    QVERIFY(server.listen(QHostAddress::LocalHost, 0));

    QNativeSocketEngine readEnd1;

    readEnd1.initialize(QAbstractSocket::TcpSocket);

    bool b = readEnd1.connectToHost(server.serverAddress(), server.serverPort());

    QVERIFY(readEnd1.waitForWrite());

//    while (!b && readEnd1.state() != QAbstractSocket::ConnectedState)

//        b = readEnd1.connectToHost(server.serverAddress(), server.serverPort());

    QVERIFY(readEnd1.state() == QAbstractSocket::ConnectedState);

    QVERIFY(server.waitForNewConnection());

    QTcpSocket *writeEnd1 = server.nextPendingConnection();

    QVERIFY(writeEnd1 != 0);

    QNativeSocketEngine readEnd2;

    readEnd2.initialize(QAbstractSocket::TcpSocket);

    b = readEnd2.connectToHost(server.serverAddress(), server.serverPort());

    QVERIFY(readEnd2.waitForWrite());

//    while (!b)

//        b = readEnd2.connectToHost(server.serverAddress(), server.serverPort());

    QVERIFY(readEnd2.state() == QAbstractSocket::ConnectedState);

    QVERIFY(server.waitForNewConnection());

    QTcpSocket *writeEnd2 = server.nextPendingConnection();

    QVERIFY(writeEnd2 != 0);

    writeEnd1->write("1", 1);

    writeEnd2->write("2", 1);

    writeEnd1->waitForBytesWritten();

    writeEnd2->waitForBytesWritten();

    writeEnd1->flush();

    writeEnd2->flush();

    UnexpectedDisconnectTester tester(&readEnd1, &readEnd2);

    do {

        // we have to wait until sequence value changes

        // as any event can make us jump out processing

        QCoreApplication::processEvents(QEventLoop::WaitForMoreEvents);

    }  while(tester.sequence <= 0);

    QVERIFY(readEnd1.state() == QAbstractSocket::ConnectedState);

    QVERIFY(readEnd2.state() == QAbstractSocket::ConnectedState);

    QCOMPARE(tester.sequence, 2);

    readEnd1.close();

    readEnd2.close();

    writeEnd1->close();

    writeEnd2->close();

    server.close();

}

class MixingWithTimersHelper : public QObject

{

    Q_OBJECT

public:

    MixingWithTimersHelper(QTimer *timer, QTcpServer *server);

    bool timerActivated;

    bool socketActivated;

private slots:

    void timerFired();

    void socketFired();

};

MixingWithTimersHelper::MixingWithTimersHelper(QTimer *timer, QTcpServer *server)

{

    timerActivated = false;

    socketActivated = false;

    connect(timer, SIGNAL(timeout()), SLOT(timerFired()));

    connect(server, SIGNAL(newConnection()), SLOT(socketFired()));

}

void MixingWithTimersHelper::timerFired()

{

    timerActivated = true;

}

void MixingWithTimersHelper::socketFired()

{

    socketActivated = true;

}

void tst_QSocketNotifier::mixingWithTimers()

{

    QTimer timer;

    timer.setInterval(0);

    timer.start();

    QTcpServer server;

    QVERIFY(server.listen(QHostAddress::LocalHost, 0));

    MixingWithTimersHelper helper(&timer, &server);

    QCoreApplication::processEvents();

    QCOMPARE(helper.timerActivated, true);

    QCOMPARE(helper.socketActivated, false);

    helper.timerActivated = false;

    helper.socketActivated = false;

    QTcpSocket socket;

    socket.connectToHost(server.serverAddress(), server.serverPort());

    QCoreApplication::processEvents();

    QCOMPARE(helper.timerActivated, true);

    QCOMPARE(helper.socketActivated, true);

}

QTEST_MAIN(tst_QSocketNotifier)

#include <tst_qsocketnotifier.moc>