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#include "qkbdlinuxinput_qws.h"

#ifndef QT_NO_QWS_KEYBOARD

#include <QSocketNotifier>

#include <QStringList>

#include <qplatformdefs.h>

#include <private/qcore_unix_p.h> // overrides QT_OPEN

#include <errno.h>

#include <termios.h>

#include <linux/kd.h>

#include <linux/input.h>

QT_BEGIN_NAMESPACE

class QWSLinuxInputKbPrivate : public QObject

{

    Q_OBJECT

public:

    QWSLinuxInputKbPrivate(QWSLinuxInputKeyboardHandler *, const QString &);

    ~QWSLinuxInputKbPrivate();

private:

    void switchLed(int, bool);

private Q_SLOTS:

    void readKeycode();

private:

    QWSLinuxInputKeyboardHandler *m_handler;

    int                           m_fd;

    int                           m_tty_fd;

    struct termios                m_tty_attr;

    int                           m_orig_kbmode;

};

QWSLinuxInputKeyboardHandler::QWSLinuxInputKeyboardHandler(const QString &device)

    : QWSKeyboardHandler(device)

{

    d = new QWSLinuxInputKbPrivate(this, device);

}

QWSLinuxInputKeyboardHandler::~QWSLinuxInputKeyboardHandler()

{

    delete d;

}

bool QWSLinuxInputKeyboardHandler::filterInputEvent(quint16 &, qint32 &)

{

    return false;

}

QWSLinuxInputKbPrivate::QWSLinuxInputKbPrivate(QWSLinuxInputKeyboardHandler *h, const QString &device)

    : m_handler(h), m_fd(-1), m_tty_fd(-1), m_orig_kbmode(K_XLATE)

{

    setObjectName(QLatin1String("LinuxInputSubsystem Keyboard Handler"));

    QString dev = QLatin1String("/dev/input/event1");

    int repeat_delay = -1;

    int repeat_rate = -1;

    QStringList args = device.split(QLatin1Char(':'));

    foreach (const QString &arg, args) {

        if (arg.startsWith(QLatin1String("repeat-delay=")))

            repeat_delay = arg.mid(13).toInt();

        else if (arg.startsWith(QLatin1String("repeat-rate=")))

            repeat_rate = arg.mid(12).toInt();

        else if (arg.startsWith(QLatin1String("/dev/")))

            dev = arg;

    }

    m_fd = QT_OPEN(dev.toLocal8Bit().constData(), O_RDWR, 0);

    if (m_fd >= 0) {

        if (repeat_delay > 0 && repeat_rate > 0) {

            int kbdrep[2] = { repeat_delay, repeat_rate };

            ::ioctl(m_fd, EVIOCSREP, kbdrep);

        }

        QSocketNotifier *notifier;

        notifier = new QSocketNotifier(m_fd, QSocketNotifier::Read, this);

        connect(notifier, SIGNAL(activated(int)), this, SLOT(readKeycode()));

        // play nice in case we are started from a shell (e.g. for debugging)

        m_tty_fd = isatty(0) ? 0 : -1;

        if (m_tty_fd >= 0) {

            // save tty config for restore.

            tcgetattr(m_tty_fd, &m_tty_attr);

            struct ::termios termdata;

            tcgetattr(m_tty_fd, &termdata);

            // record the original mode so we can restore it again in the destructor.

            ::ioctl(m_tty_fd, KDGKBMODE, &m_orig_kbmode);

            // setting this tranlation mode is even needed in INPUT mode to prevent

            // the shell from also interpreting codes, if the process has a tty

            // attached: e.g. Ctrl+C wouldn't copy, but kill the application.

            ::ioctl(m_tty_fd, KDSKBMODE, K_MEDIUMRAW);

            // set the tty layer to pass-through

            termdata.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP);

            termdata.c_oflag = 0;

            termdata.c_cflag = CREAD | CS8;

            termdata.c_lflag = 0;

            termdata.c_cc[VTIME]=0;

            termdata.c_cc[VMIN]=1;

            cfsetispeed(&termdata, 9600);

            cfsetospeed(&termdata, 9600);

            tcsetattr(m_tty_fd, TCSANOW, &termdata);

        }

    } else {

        qWarning("Cannot open keyboard input device '%s': %s", qPrintable(dev), strerror(errno));

        return;

    }

}

QWSLinuxInputKbPrivate::~QWSLinuxInputKbPrivate()

{

    if (m_tty_fd >= 0) {

        ::ioctl(m_tty_fd, KDSKBMODE, m_orig_kbmode);

        tcsetattr(m_tty_fd, TCSANOW, &m_tty_attr);

    }

    if (m_fd >= 0)

        QT_CLOSE(m_fd);

}

void QWSLinuxInputKbPrivate::switchLed(int led, bool state)

{

    struct ::input_event led_ie;

    ::gettimeofday(&led_ie.time, 0);

    led_ie.type = EV_LED;

    led_ie.code = led;

    led_ie.value = state;

    QT_WRITE(m_fd, &led_ie, sizeof(led_ie));

}

void QWSLinuxInputKbPrivate::readKeycode()

{

    struct ::input_event buffer[32];

    int n = 0;

    forever {

        n = QT_READ(m_fd, reinterpret_cast<char *>(buffer) + n, sizeof(buffer) - n);

        if (n == 0) {

            qWarning("Got EOF from the input device.");

            return;

        } else if (n < 0 && (errno != EINTR && errno != EAGAIN)) {

            qWarning("Could not read from input device: %s", strerror(errno));

            return;

        } else if (n % sizeof(buffer[0]) == 0) {

            break;

        }

    }

    n /= sizeof(buffer[0]);

    for (int i = 0; i < n; ++i) {

        if (buffer[i].type != EV_KEY)

            continue;

        quint16 code = buffer[i].code;

        qint32 value = buffer[i].value;

        if (m_handler->filterInputEvent(code, value))

            continue;

        QWSKeyboardHandler::KeycodeAction ka;

        ka = m_handler->processKeycode(code, value != 0, value == 2);

        switch (ka) {

        case QWSKeyboardHandler::CapsLockOn:

        case QWSKeyboardHandler::CapsLockOff:

            switchLed(LED_CAPSL, ka == QWSKeyboardHandler::CapsLockOn);

            break;

        case QWSKeyboardHandler::NumLockOn:

        case QWSKeyboardHandler::NumLockOff:

            switchLed(LED_NUML, ka == QWSKeyboardHandler::NumLockOn);

            break;

        case QWSKeyboardHandler::ScrollLockOn:

        case QWSKeyboardHandler::ScrollLockOff:

            switchLed(LED_SCROLLL, ka == QWSKeyboardHandler::ScrollLockOn);

            break;

        default:

            // ignore console switching and reboot

            break;

        }

    }

}

QT_END_NAMESPACE

#include "qkbdlinuxinput_qws.moc"

#endif // QT_NO_QWS_KEYBOARD