/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the plugins of the Qt Toolkit.
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** 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:
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** rights. These rights are described in the Nokia 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:
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** Alternatively, this file may be used in accordance with the terms and
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** $QT_END_LICENSE$
**
****************************************************************************/

#include <stdlib.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <private/qcore_unix_p.h> // overrides QT_OPEN

#include <qvfbhdr.h>
#include <qsocketnotifier.h>

#include "qvfbintegration.h"
#include "qvfbwindowsurface.h"
#include <QtGui/private/qpixmap_raster_p.h>
#include <QtCore/qdebug.h>
#include <QMouseEvent>

#include <qsocketnotifier.h>
#include <QApplication>
#include <QWindowSystemInterface>

#include "qgenericunixfontdatabase.h"
#include "qgenericunixeventdispatcher.h"

QT_BEGIN_NAMESPACE


class QVFbScreenKeyboardHandler : public QObject
{
    Q_OBJECT
public:
    QVFbScreenKeyboardHandler(int displayId);
    ~QVFbScreenKeyboardHandler();

private slots:
    void readKeyboardData();

private:
    int kbdFD;
    int kbdIdx;
    int kbdBufferLen;
    unsigned char *kbdBuffer;
    QSocketNotifier *keyNotifier;
};

QVFbScreenKeyboardHandler::QVFbScreenKeyboardHandler(int displayId)
{
    const QString keyboardDev = QT_VFB_KEYBOARD_PIPE(displayId);


    kbdFD = -1;
    kbdIdx = 0;
    kbdBufferLen = sizeof(QVFbKeyData) * 5;
    kbdBuffer = new unsigned char [kbdBufferLen];

    kbdFD = QT_OPEN(keyboardDev.toLatin1().constData(), O_RDWR | O_NDELAY);

    if (kbdFD == -1) {
        perror("QVFbScreenKeyboardHandler");
        qWarning("QVFbScreenKeyboardHandler: Unable to open device %s",
                 qPrintable(keyboardDev));
        return;
    }

    // Clear pending input
    char buf[2];
    while (QT_READ(kbdFD, buf, 1) > 0) { }

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

}

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


void QVFbScreenKeyboardHandler::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);

        QEvent::Type type = kd->press ? QEvent::KeyPress : QEvent::KeyRelease;

        QString text;
        if (kd->unicode && kd->unicode != 0xffff)
            text += QChar(kd->unicode);

//        qDebug() << "readKeyboardData" << type << hex << kd->keycode << kd->modifiers << text;

        QWindowSystemInterface::handleKeyEvent(0, type, kd->keycode, kd->modifiers, text, kd->repeat, int(text.length()));
        idx += sizeof(QVFbKeyData);
    }

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




class QVFbScreenMouseHandler : public QObject
{
    Q_OBJECT
public:
    QVFbScreenMouseHandler(int displayId);
    ~QVFbScreenMouseHandler();

private slots:
    void readMouseData();

private:
    int mouseFD;
    int mouseIdx;
    enum {mouseBufSize = 128};
    uchar mouseBuf[mouseBufSize];
    QSocketNotifier *mouseNotifier;

    int oldButtonState;
};

QVFbScreenMouseHandler::QVFbScreenMouseHandler(int displayId)
{
    QString mouseDev = QT_VFB_MOUSE_PIPE(displayId);

    mouseFD = QT_OPEN(mouseDev.toLatin1().constData(), O_RDWR | O_NDELAY);

        if (mouseFD == -1) {
        perror("QVFbMouseHandler::QVFbMouseHandler");
        qWarning("QVFbMouseHander: Unable to open device %s",
                 qPrintable(mouseDev));
        return;
    }

    // Clear pending input
    char buf[2];
    while (QT_READ(mouseFD, buf, 1) > 0) { }

    mouseIdx = 0;
    oldButtonState = 0;
    mouseNotifier = new QSocketNotifier(mouseFD, QSocketNotifier::Read, this);
    connect(mouseNotifier, SIGNAL(activated(int)),this, SLOT(readMouseData()));
}


QVFbScreenMouseHandler::~QVFbScreenMouseHandler()
{
    if (mouseFD >= 0)
        QT_CLOSE(mouseFD);
}

void QVFbScreenMouseHandler::readMouseData()
{
   int n;
    do {
        n = QT_READ(mouseFD, mouseBuf+mouseIdx, mouseBufSize-mouseIdx);
        if (n > 0)
            mouseIdx += n;
    } while (n > 0);

    int idx = 0;
    static const int packetsize = sizeof(QPoint) + 2*sizeof(int);
    while (mouseIdx-idx >= packetsize) {
        uchar *mb = mouseBuf+idx;
        QPoint mousePos = *reinterpret_cast<QPoint *>(mb);
        mb += sizeof(QPoint);
        int bstate = *reinterpret_cast<int *>(mb);
        mb += sizeof(int);
        //int wheel = *reinterpret_cast<int *>(mb);

        int button = bstate ^ oldButtonState;
        QEvent::Type type = QEvent::MouseMove;

        if (button) {
            type = (button & bstate) ? QEvent::MouseButtonPress : QEvent::MouseButtonRelease;
        }
        QWindowSystemInterface::handleMouseEvent(0, mousePos, mousePos, Qt::MouseButtons(bstate));

//        qDebug() << "readMouseData" << mousePos << button << bstate << oldButtonState << type;

        oldButtonState = bstate;

        idx += packetsize;
    }

    int surplus = mouseIdx - idx;
    for (int i = 0; i < surplus; i++)
        mouseBuf[i] = mouseBuf[idx+i];
    mouseIdx = surplus;

}


class QVFbScreenPrivate
{
public:
    QVFbScreenPrivate(int id)
        : shmrgn(0), hdr(0), data(0), mouseHandler(0), keyboardHandler(0)
        {
            displayId = id;
            connect(displayId);
        }

    ~QVFbScreenPrivate() { disconnect(); }
    void setDirty(const QRect &r);

    bool connect(int displayId);
    void disconnect();

    QImage *screenImage() { return &img; }
    QSize screenSize() { return img.size(); }

    int depth() const { return img.depth(); }
    QImage::Format format() const { return img.format(); }

private:
    unsigned char *shmrgn;
    QVFbHeader *hdr;
    uchar *data;
    QVFbScreenMouseHandler *mouseHandler;
    QVFbScreenKeyboardHandler *keyboardHandler;
    int displayId;

    QImage img;
};


void QVFbScreenPrivate::setDirty(const QRect &r)
{
    hdr->dirty = true;
    hdr->update = hdr->update.united(r);
}


bool QVFbScreenPrivate::connect(int displayId)
{
    qDebug() << "QVFbScreenPrivate::connect" << displayId;
    key_t key = ftok(QT_VFB_MOUSE_PIPE(displayId).toLatin1(), 'b');

    if (key == -1)
        return false;


    int shmId = shmget(key, 0, 0);
    if (shmId != -1)
        shmrgn = (unsigned char *)shmat(shmId, 0, 0);
    else
        return false;

    if ((long)shmrgn == -1 || shmrgn == 0) {
        qDebug("No shmrgn %ld", (long)shmrgn);
        return false;
    }

    hdr = (QVFbHeader *)shmrgn;
    data = shmrgn + hdr->dataoffset;

    int w = hdr->width;
    int h = hdr->height;
    int d = hdr->depth;
    int lstep = hdr->linestep;

    QImage::Format format = QImage::Format_Invalid;
    if (d == 32)
        format = QImage::Format_ARGB32_Premultiplied;
    else if (d == 16)
        format = QImage::Format_RGB16;


    if (format == QImage::Format_Invalid) {
        img = QImage();
        return false;
    }

    img = QImage(data, w, h, lstep, format);

    qDebug("connected %dx%d %d bpp", w, h, d);


    mouseHandler = new QVFbScreenMouseHandler(displayId);
    keyboardHandler = new QVFbScreenKeyboardHandler(displayId);
    return true;
}

void QVFbScreenPrivate::disconnect()
{
    if ((long)shmrgn != -1 && shmrgn) {
        shmdt((char*)shmrgn);
        shmrgn = 0;
    }
    delete mouseHandler;
    mouseHandler = 0;
    delete keyboardHandler;
    keyboardHandler = 0;
}


QVFbScreen::QVFbScreen(int id)
{
    d_ptr = new QVFbScreenPrivate(id);
}


QVFbScreen::~QVFbScreen()
{
    delete d_ptr;
}

void QVFbScreen::setDirty(const QRect &rect)
{
    d_ptr->setDirty(rect);
}



QRect QVFbScreen::geometry() const {
    return QRect(QPoint(), d_ptr->screenSize());
}


int QVFbScreen::depth() const
{
    return d_ptr->depth();
}

QImage::Format QVFbScreen::format() const
{
    return d_ptr->format();
}

QSize QVFbScreen::physicalSize() const {
    return (d_ptr->screenSize()*254)/720;
}

#if 0
int QVFbScreen::linestep() const {
    return d_ptr->screenImage() ? d_ptr->screenImage()->bytesPerLine() : 0;
}

uchar *QVFbScreen::base() const {
    return d_ptr->screenImage() ? d_ptr->screenImage()->bits() : 0;
}
#endif

QImage *QVFbScreen::screenImage()
{
    return d_ptr->screenImage();
}

QVFbIntegration::QVFbIntegration(const QStringList &paramList)
    : mFontDb(new QGenericUnixFontDatabase())
{
    int displayId = 0;
    if (paramList.length() > 0)
        displayId = paramList.at(0).toInt();

    mPrimaryScreen = new QVFbScreen(displayId);

    mScreens.append(mPrimaryScreen);
}

QPlatformPixmap *QVFbIntegration::createPlatformPixmap(QPlatformPixmap::PixelType type) const
{
    return new QRasterPlatformPixmap(type);
}

QWindowSurface *QVFbIntegration::createWindowSurface(QWidget *widget, WId) const
{
    return new QVFbWindowSurface(mPrimaryScreen, widget);
}


QPlatformWindow *QVFbIntegration::createPlatformWindow(QWidget *widget, WId) const
{
    return new QVFbWindow(mPrimaryScreen, widget);
}

QAbstractEventDispatcher *QVFbIntegration::createEventDispatcher() const
{
    return createUnixEventDispatcher();
}

QPlatformFontDatabase *QVFbIntegration::fontDatabase() const
{
    return mFontDb;
}

QT_END_NAMESPACE

#include "qvfbintegration.moc"