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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
    int sequence;

public:
    QNativeSocketEngine *readEnd1, *readEnd2;

    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()));
    }

    const int getSequence() {
        return sequence;
    }

    void incSequence() {
        ++sequence;
    }

public slots:
    void handleActivated()
    {
        char data1[1], data2[1];
        incSequence();
        if (getSequence() == 1) {
            // read from both ends
            (void) readEnd1->read(data1, sizeof(data1));
            (void) readEnd2->read(data2, sizeof(data2));
            emit finished();
        } else if (getSequence() == 2) {
            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.getSequence() <= 0);

    QVERIFY(readEnd1.state() == QAbstractSocket::ConnectedState);
    QVERIFY(readEnd2.state() == QAbstractSocket::ConnectedState);
#if defined(Q_OS_WIN)
    qWarning("### Windows returns 1 activation, Unix returns 2.");
    QCOMPARE(tester.sequence, 1);
#else
    QCOMPARE(tester.getSequence(), 2);
#endif

    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>