/****************************************************************************
**
** 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
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** 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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** 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
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qkbdqnx_qws.h"

#include "qplatformdefs.h"
#include "qsocketnotifier.h"
#include "private/qcore_unix_p.h"
#include "QtCore/qdebug.h"

#include <sys/dcmd_input.h>
#include <sys/keycodes.h>
#include <errno.h>

QT_BEGIN_NAMESPACE

/*!
    \class QWSQnxKeyboardHandler
    \preliminary
    \ingroup qws
    \since 4.6
    \internal

    \brief The QWSQnxKeyboardHandler class implements a keyboard driver
    for the QNX \c{devi-hid} input manager.

    To be able to compile this mouse handler, \l{Qt for Embedded Linux}
    must be configured with the \c -qt-kbd-qnx option, see the
    \l{Qt for Embedded Linux Character Input} documentation for details.

    In order to use this keyboard handler, the \c{devi-hid} input manager
    must be set up and run with the resource manager interface (option \c{-r}).
    Also, Photon must not be running.

    Example invocation from command line: \c{/usr/photon/bin/devi-hid -Pr kbd mouse}
    Note that after running \c{devi-hid}, you will not be able to use the local
    shell anymore. It is suggested to run the command in a shell script, that launches
    a Qt application after invocation of \c{devi-hid}.

    To make \l{Qt for Embedded Linux} explicitly choose the qnx keyboard
    handler, set the QWS_KEYBOARD environment variable to \c{qnx}. By default,
    the first keyboard device (\c{/dev/devi/keyboard0}) is used. To override, pass a device
    name as the first and only parameter, for example
    \c{QWS_KEYBOARD=qnx:/dev/devi/keyboard1; export QWS_KEYBOARD}.

    \sa {Qt for Embedded Linux Character Input}, {Qt for Embedded Linux}
*/

/*!
    Constructs a keyboard handler for the specified \a device, defaulting to
    \c{/dev/devi/keyboard0}.

    Note that you should never instanciate this class, instead let QKbdDriverFactory
    handle the keyboard handlers.

    \sa QKbdDriverFactory
 */
QWSQnxKeyboardHandler::QWSQnxKeyboardHandler(const QString &device)
{
    // open the keyboard device
    keyboardFD = QT_OPEN(device.isEmpty() ? "/dev/devi/keyboard0" : device.toLatin1().constData(),
                         QT_OPEN_RDONLY);
    if (keyboardFD == -1) {
        qErrnoWarning(errno, "QWSQnxKeyboardHandler: Unable to open device");
    } else {
        // create a socket notifier so we'll wake up whenever keyboard input is detected.
        QSocketNotifier *notifier = new QSocketNotifier(keyboardFD, QSocketNotifier::Read, this);
        connect(notifier, SIGNAL(activated(int)), SLOT(socketActivated()));

        qDebug("QWSQnxKeyboardHandler: connected.");
    }
}

/*!
    Destroys this keyboard handler and closes the connection to the keyboard device.
 */
QWSQnxKeyboardHandler::~QWSQnxKeyboardHandler()
{
    if (keyboardFD != -1)
        QT_CLOSE(keyboardFD);
}

// similar to PhKeyToMb
static inline bool key_sym_displayable(unsigned long sym)
{
    if (sym >= 0xF000)
        return sym >= 0xF100 && (sizeof(wchar_t) > 2 || sym < 0x10000);
    return (sym & ~0x9F) != 0; // exclude 0...0x1F and 0x80...0x9F
}

/*! \internal
    Translates the QNX keyboard events to Qt keyboard events
 */
void QWSQnxKeyboardHandler::socketActivated()
{
    _keyboard_packet packet;

    // read one keyboard event
    int bytesRead = QT_READ(keyboardFD, &packet, sizeof(_keyboard_packet));
    if (bytesRead == -1) {
        qErrnoWarning(errno, "QWSQnxKeyboardHandler::socketActivated(): Unable to read data.");
        return;
    }

    // the bytes read must be the size of a keyboard packet
    Q_ASSERT(bytesRead == sizeof(_keyboard_packet));

    if (packet.data.flags & KEY_SYM_VALID_EX)
        packet.data.flags |= KEY_SYM_VALID;
    else if (!(packet.data.flags & (KEY_SYM_VALID | KEY_CAP_VALID)))
        return;

#if 0
    qDebug() << "keyboard got scancode"
             << hex << packet.data.modifiers
             << packet.data.flags
             << packet.data.key_cap
             << packet.data.key_sym
             << packet.data.key_scan;
#endif

    // QNX is nice enough to translate the raw keyboard data into generic format for us.
    // Now we just have to translate it into a format Qt understands.

    // figure out the modifiers that are currently pressed
    Qt::KeyboardModifiers modifiers = Qt::NoModifier;
    if (packet.data.modifiers & KEYMOD_SHIFT)
        modifiers |= Qt::ShiftModifier;
    if (packet.data.modifiers & KEYMOD_CTRL)
        modifiers |= Qt::ControlModifier;
    if (packet.data.modifiers & KEYMOD_ALT)
        modifiers |= Qt::AltModifier;
    if (packet.data.modifiers & KEYMOD_NUM_LOCK)
        modifiers |= Qt::KeypadModifier;
#if 0
    // special case for AltGr
    if (packet.data.modifiers & KEYMOD_ALTGR)
        key = Qt::Key_AltGr;
#endif

    // figure out whether it's a press
    bool isPress = packet.data.flags & KEY_DOWN;
    // figure out whether the key is still pressed and the key event is repeated
    bool isRepeat = packet.data.flags & KEY_REPEAT;

    int key = Qt::Key_unknown;
    int unicode = 0;

    if (((packet.data.flags & KEY_SYM_VALID) && key_sym_displayable(unicode = packet.data.key_sym))
        || ((packet.data.flags & KEY_CAP_VALID) && key_sym_displayable(unicode = packet.data.key_cap))) {
        if (unicode <= 0x0ff) {
            if (unicode >= 'a' && unicode <= 'z')
                key = Qt::Key_A + unicode - 'a';
            else
                key = unicode;
        }
        // Ctrl<something> or Alt<something> is not a displayable character
        if (modifiers & (Qt::ControlModifier | Qt::AltModifier))
            unicode = 0;
    } else {
        unicode = 0;

        unsigned long sym = 0;
        if (packet.data.flags & KEY_SYM_VALID)
            sym = packet.data.key_sym;
        else if (packet.data.flags & KEY_CAP_VALID)
            sym = packet.data.key_cap;

        switch (sym) {
        case KEYCODE_ESCAPE: key = Qt::Key_Escape; unicode = 27; break;
        case KEYCODE_TAB: key = Qt::Key_Tab; unicode = 9; break;
        case KEYCODE_BACK_TAB: key = Qt::Key_Backtab; break;
        case KEYCODE_BACKSPACE: key = Qt::Key_Backspace; unicode = 127; break;
        case KEYCODE_RETURN: key = Qt::Key_Return; break;
        case KEYCODE_KP_ENTER: key = Qt::Key_Enter; break;
        case KEYCODE_INSERT:
        case KEYCODE_KP_INSERT:
            key = Qt::Key_Insert; break;
        case KEYCODE_KP_DELETE:
            if (modifiers & Qt::KeypadModifier) {
                key = Qt::Key_Comma;
                break;
            }
        // fall through
        case KEYCODE_DELETE:
            key = Qt::Key_Delete; break;
        case KEYCODE_PAUSE:
        case KEYCODE_BREAK:
            if (modifiers & (Qt::ControlModifier | Qt::AltModifier))
                return; // sometimes occurs at the middle of a key sequence
            key = Qt::Key_Pause; break;
        case KEYCODE_PRINT:
            if (modifiers & (Qt::ControlModifier | Qt::AltModifier))
                return; // sometimes occurs at the middle of a key sequence
            key = Qt::Key_Print; break;
        case KEYCODE_SYSREQ:
            key = Qt::Key_SysReq; break;
        case KEYCODE_HOME:
        case KEYCODE_KP_HOME:
            key = Qt::Key_Home; break;
        case KEYCODE_END:
        case KEYCODE_KP_END:
            key = Qt::Key_End; break;
        case KEYCODE_LEFT:
        case KEYCODE_KP_LEFT:
            key = Qt::Key_Left; break;
        case KEYCODE_UP:
        case KEYCODE_KP_UP:
            key = Qt::Key_Up; break;
        case KEYCODE_RIGHT:
        case KEYCODE_KP_RIGHT:
            key = Qt::Key_Right; break;
        case KEYCODE_DOWN:
        case KEYCODE_KP_DOWN:
            key = Qt::Key_Down; break;
        case KEYCODE_PG_UP:
        case KEYCODE_KP_PG_UP:
            key = Qt::Key_PageUp; break;
        case KEYCODE_PG_DOWN:
        case KEYCODE_KP_PG_DOWN:
            key = Qt::Key_PageDown; break;

        case KEYCODE_LEFT_SHIFT:
        case KEYCODE_RIGHT_SHIFT:
            key = Qt::Key_Shift; break;
        case KEYCODE_LEFT_CTRL:
        case KEYCODE_RIGHT_CTRL:
            key = Qt::Key_Control; break;
        case KEYCODE_LEFT_ALT:
        case KEYCODE_RIGHT_ALT:
            key = Qt::Key_Alt; break;
        case KEYCODE_CAPS_LOCK:
            key = Qt::Key_CapsLock; break;
        case KEYCODE_NUM_LOCK:
            key = Qt::Key_NumLock; break;
        case KEYCODE_SCROLL_LOCK:
            key = Qt::Key_ScrollLock; break;

        case KEYCODE_F1:
        case KEYCODE_F2:
        case KEYCODE_F3:
        case KEYCODE_F4:
        case KEYCODE_F5:
        case KEYCODE_F6:
        case KEYCODE_F7:
        case KEYCODE_F8:
        case KEYCODE_F9:
        case KEYCODE_F10:
        case KEYCODE_F11:
        case KEYCODE_F12:
            key = Qt::Key_F1 + sym - KEYCODE_F1; break;

        case KEYCODE_MENU: key = Qt::Key_Menu; break;
        case KEYCODE_LEFT_HYPER: key = Qt::Key_Hyper_L; break;
        case KEYCODE_RIGHT_HYPER: key = Qt::Key_Hyper_R; break;

        case KEYCODE_KP_PLUS: key = Qt::Key_Plus; break;
        case KEYCODE_KP_MINUS: key = Qt::Key_Minus; break;
        case KEYCODE_KP_MULTIPLY: key = Qt::Key_multiply; break;
        case KEYCODE_KP_DIVIDE: key = Qt::Key_Slash; break;
        case KEYCODE_KP_FIVE:
            if (!(modifiers & Qt::KeypadModifier))
                key = Qt::Key_5;
            break;

        default: // none of the above
            break;
        }
    }

    if (key == Qt::Key_unknown && unicode == 0)
        return;

    // call processKeyEvent. This is where all the magic happens to insert a
    // key event into Qt's event loop.
    // Note that for repeated key events, isPress must be true
    // (on QNX, isPress is not set when the key event is repeated).
    processKeyEvent(unicode, key, modifiers, isPress || isRepeat, isRepeat);
}

QT_END_NAMESPACE