/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
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** GNU Lesser General Public License Usage
** Alternatively, 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.
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** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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** $QT_END_LICENSE$
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****************************************************************************/

#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <qvfbhdr.h>
#include <qkbdvfb_qws.h>

#ifndef QT_NO_QWS_KEYBOARD
#ifndef QT_NO_QWS_KBD_QVFB

#include <qwindowsystem_qws.h>
#include <qsocketnotifier.h>
#include <qapplication.h>
#include <private/qcore_unix_p.h> // overrides QT_OPEN

QT_BEGIN_NAMESPACE

QVFbKeyboardHandler::QVFbKeyboardHandler(const QString &device)
    : QObject()
{
    terminalName = device;
    if (terminalName.isEmpty())
        terminalName = QLatin1String("/dev/vkdb");
    kbdFD = -1;
    kbdIdx = 0;
    kbdBufferLen = sizeof(QVFbKeyData) * 5;
    kbdBuffer = new unsigned char [kbdBufferLen];

    if ((kbdFD = QT_OPEN(terminalName.toLatin1().constData(), O_RDONLY | O_NDELAY)) < 0) {
        qWarning("Cannot open %s (%s)", terminalName.toLatin1().constData(),
        strerror(errno));
    } else {
        // Clear pending input
        char buf[2];
        while (QT_READ(kbdFD, buf, 1) > 0) { }

        notifier = new QSocketNotifier(kbdFD, QSocketNotifier::Read, this);
        connect(notifier, SIGNAL(activated(int)),this, SLOT(readKeyboardData()));
    }
}

QVFbKeyboardHandler::~QVFbKeyboardHandler()
{
    if (kbdFD >= 0)
        QT_CLOSE(kbdFD);
    delete [] kbdBuffer;
}


void QVFbKeyboardHandler::readKeyboardData()
{
    int n;
    do {
        n  = QT_READ(kbdFD, kbdBuffer+kbdIdx, kbdBufferLen - kbdIdx);
        if (n > 0)
            kbdIdx += n;
    } while (n > 0);

    int idx = 0;
    while (kbdIdx - idx >= (int)sizeof(QVFbKeyData)) {
        QVFbKeyData *kd = (QVFbKeyData *)(kbdBuffer + idx);
        if (kd->unicode == 0 && kd->keycode == 0 && kd->modifiers == 0 && kd->press) {
            // magic exit key
            qWarning("Instructed to quit by Virtual Keyboard");
            qApp->quit();
        }
        QWSServer::processKeyEvent(kd->unicode ? kd->unicode : 0xffff, kd->keycode, kd->modifiers, kd->press, kd->repeat);
        idx += sizeof(QVFbKeyData);
    }

    int surplus = kbdIdx - idx;
    for (int i = 0; i < surplus; i++)
        kbdBuffer[i] = kbdBuffer[idx+i];
    kbdIdx = surplus;
}

QT_END_NAMESPACE

#endif // QT_NO_QWS_KBD_QVFB
#endif // QT_NO_QWS_KEYBOARD
