/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Copyright (C) 2016 Ivailo Monev
**
** This file is part of the test suite of the Katie Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
**
** GNU Lesser General Public License Usage
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/


#include <QtTest/QtTest>

#include <QtCore/QCoreApplication>
#include <QtCore/QSocketNotifier>
#include <QtCore/QTimer>
#include <QtNetwork/QTcpServer>
#include <QtNetwork/QTcpSocket>
#include "qnativesocketengine_p.h"
#include "qnet_unix_p.h"

#include <sys/select.h>
#include <limits>

class tst_QSocketNotifier : public QObject
{
    Q_OBJECT
public:
    tst_QSocketNotifier();
    ~tst_QSocketNotifier();

private slots:
    void unexpectedDisconnection();
    void mixingWithTimers();
    void posixSockets();
};

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);

    QTimer timer;
    timer.setSingleShot(true);
    timer.start(30000);
    do {
        // we have to wait until sequence value changes
        // as any event can make us jump out processing
        QCoreApplication::processEvents(QEventLoop::WaitForMoreEvents);
        QVERIFY(timer.isActive()); //escape if test would hang
    }  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());
    server.waitForNewConnection(2000);

    QCoreApplication::processEvents();

    QCOMPARE(helper.timerActivated, true);
    QCOMPARE(helper.socketActivated, true);
}

void tst_QSocketNotifier::posixSockets()
{
    QTcpServer server;
    QVERIFY(server.listen(QHostAddress::LocalHost, 0));

    int posixSocket = qt_safe_socket(AF_INET, SOCK_STREAM, 0);
    sockaddr_in addr;
    addr.sin_addr.s_addr = htonl(0x7f000001);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(server.serverPort());
    qt_safe_connect(posixSocket, (const struct sockaddr*)&addr, sizeof(sockaddr_in));
    QVERIFY(server.waitForNewConnection(5000));
    QScopedPointer<QTcpSocket> passive(server.nextPendingConnection());

    ::fcntl(posixSocket, F_SETFL, ::fcntl(posixSocket, F_GETFL) | O_NONBLOCK);

    {
        QSocketNotifier rn(posixSocket, QSocketNotifier::Read);
        connect(&rn, SIGNAL(activated(int)), &QTestEventLoop::instance(), SLOT(exitLoop()));
        QSignalSpy readSpy(&rn, SIGNAL(activated(int)));
        // No write notifier, some systems trigger write notification on socket creation, but not all
        QSocketNotifier en(posixSocket, QSocketNotifier::Exception);
        connect(&en, SIGNAL(activated(int)), &QTestEventLoop::instance(), SLOT(exitLoop()));
        QSignalSpy errorSpy(&en, SIGNAL(activated(int)));

        passive->write("hello",6);
        passive->waitForBytesWritten(5000);

        QTestEventLoop::instance().enterLoop(3);
        QCOMPARE(readSpy.count(), 1);
        QCOMPARE(errorSpy.count(), 0);

        char buffer[100];
        int r = qt_safe_read(posixSocket, buffer, 100);
        QCOMPARE(r, 6);
        QCOMPARE(buffer, "hello");

        QSocketNotifier wn(posixSocket, QSocketNotifier::Write);
        connect(&wn, SIGNAL(activated(int)), &QTestEventLoop::instance(), SLOT(exitLoop()));
        QSignalSpy writeSpy(&wn, SIGNAL(activated(int)));
        qt_safe_write(posixSocket, "goodbye", 8);

        QTestEventLoop::instance().enterLoop(3);
        QCOMPARE(readSpy.count(), 1);
        QCOMPARE(writeSpy.count(), 1);
        QCOMPARE(errorSpy.count(), 0);

        // Write notifier may have fired before the read notifier inside
        // QTcpSocket, give QTcpSocket a chance to see the incoming data
        passive->waitForReadyRead(1000);
        QCOMPARE(passive->readAll(), QByteArray("goodbye",8));
    }
    qt_safe_close(posixSocket);
}

QTEST_MAIN(tst_QSocketNotifier)

#include "moc_tst_qsocketnotifier.cpp"