#include "minidisplay.h"

#include <QPainter>

#include <QTimer>

const int KMaxReadAttempt=100;

MiniDisplay::MiniDisplay(QQuickItem *parent):

    QQuickItem(parent),iReadAttempt(0),iBrightness(0)

{

    // By default, QQuickItem does not draw anything. If you subclass

    // QQuickItem to create a visual item, you will need to uncomment the

    // following line and re-implement updatePaintNode()

    // setFlag(ItemHasContents, true);

    //

    //qDebug() << "New MiniDisplay";

}

MiniDisplay::~MiniDisplay()

{

    //qDebug() << "Delete MiniDisplay";

}

void MiniDisplay::open()

{

    if (iDisplay.Open())

    {

        iDisplay.SetBrightness(iBrightness);

        emit opened();

        emit statusChanged();

    }

    else

    {

        emit openError();

    }

}

void MiniDisplay::close()

{

    iDisplay.Close();

    emit closed();

    emit statusChanged();

}

bool MiniDisplay::isOpen()

{

    return iDisplay.IsOpen();

}

void MiniDisplay::clear()

{

    if (!iDisplay.IsOpen()) return;

    //

    iDisplay.Clear();

}

void MiniDisplay::fill()

{

    if (!iDisplay.IsOpen()) return;

    //

    iDisplay.SetAllPixels(0xFF);

}

void MiniDisplay::swapBuffers()

{

    if (!iDisplay.IsOpen()) return;

    //

    iDisplay.SwapBuffers();

}

void MiniDisplay::requestPowerStatus()

{

    if (!iDisplay.IsOpen()) return;

    iDisplay.RequestPowerSupplyStatus();

    QTimer::singleShot(4, this, SLOT(readTimer()));

    iReadAttempt=0;

}

void MiniDisplay::requestDeviceId()

{

    if (!iDisplay.IsOpen()) return;

    iDisplay.RequestDeviceId();

    QTimer::singleShot(4, this, SLOT(readTimer()));

    iReadAttempt=0;

}

void MiniDisplay::requestFirmwareVersion()

{

    if (!iDisplay.IsOpen()) return;

    iDisplay.RequestFirmwareRevision();

    QTimer::singleShot(4, this, SLOT(readTimer()));

    iReadAttempt=0;

}

/**

 * @brief setFont

 * @param aFont

 */

void MiniDisplay::setFont(const QFont& aFont)

{

    iFont=aFont;

    iFont.setStyleStrategy(QFont::NoAntialias);

    QString strDemo="0123456789ABCDEF";

    QFontMetrics metrics(iFont);

    int w=metrics.width(strDemo);

    int h=metrics.height();

    QSize size(w,h);

    QImage image(size,QImage::Format_Mono);

    image.fill(0xFFFFFFFF);

    //Draw some text into our image

    {

        QPainter painter(&image);

        //painter.begin(&image);

        painter.setPen(0xFF000000);

        painter.setFont(iFont);

        painter.drawText(0,metrics.ascent(),strDemo);

    }

    //Save image as PNG for validation

    image.save("font.png");

    //

    //int sizeInBytes=image.byteCount();

    int pixelCount=w*h;

    BitArray bits(pixelCount);

    for (int i=0;i<w;i++)

        {

        for (int j=0;j<h;j++)

            {

            QRgb color=image.pixel(i,j);

            if (color!=0xffffffff)

                {

                bits.SetBit(i*h+j);

                }

            }

        }

    if (iDisplay.IsOpen())

    {

        iDisplay.Clear();

        iDisplay.BitBlit(bits,w,h,0,0);

        iDisplay.SwapBuffers();

    }

    //

}

QString MiniDisplay::vendor()

{

    return QString::fromWCharArray(iDisplay.Vendor());

}

QString MiniDisplay::product()

{

    return QString::fromWCharArray(iDisplay.Product());

}

QString MiniDisplay::serialNumber()

{

    return QString::fromWCharArray(iDisplay.SerialNumber());

}

/**

 * @brief MiniDisplay::readTimer

 * Called when our read timer completes.

 * We then attempt to complete our pending display request.

 * We typically attempt to read an input report from our HID device.

 */

void MiniDisplay::readTimer()

{

    if (!iDisplay.IsOpen()) return;

    if (!iDisplay.RequestPending()) return;

    iReadAttempt++;

    GP1212A01A::Request request = iDisplay.AttemptRequestCompletion();

    if (!request)

    {

        if (iReadAttempt<KMaxReadAttempt)

        {

            //Will try again later

            QTimer::singleShot(4, this, SLOT(readTimer()));

        }

        return;

    }

    //TODO: Find a way to remove device specific stuff from here

    if (request==GP1212A01A::ERequestFirmwareRevision)

    {

        QString version=QString::fromLocal8Bit((const char*)iDisplay.InputReport().Buffer()+1);

        emit firmwareVersion(version);

    }

    else if (request==GP1212A01A::ERequestDeviceId)

    {

        QString id=QString::fromLocal8Bit((const char*)iDisplay.InputReport().Buffer()+1);

        emit deviceId(id);

    }

    else if (request==GP1212A01A::ERequestPowerSupplyStatus)

    {

        emit powerStatus(iDisplay.PowerOn());

    }

}

int MiniDisplay::maxBrightness() const

{

    return iDisplay.MaxBrightness();

}

int MiniDisplay::minBrightness() const

{

    return iDisplay.MinBrightness();

}

int MiniDisplay::brightness() const

{

    return iBrightness;

}

void MiniDisplay::setBrightness(int aBrightness)

{

    //Still track the brightness when disconnected

    iBrightness=aBrightness;

    if (!iDisplay.IsOpen()) return;

    iDisplay.SetBrightness(aBrightness);

}