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#include <QXmlStreamReader>

#include "fluidlauncher.h"

#define DEFAULT_INPUT_TIMEOUT 10000

#define SIZING_FACTOR_HEIGHT 6/10

#define SIZING_FACTOR_WIDTH 6/10

FluidLauncher::FluidLauncher(QStringList* args)

{

    pictureFlowWidget = new PictureFlow();

    slideShowWidget = new SlideShow();

    inputTimer = new QTimer();

    addWidget(pictureFlowWidget);

    addWidget(slideShowWidget);

    setCurrentWidget(pictureFlowWidget);

    pictureFlowWidget->setFocus();

    QRect screen_size = QApplication::desktop()->screenGeometry();

    QObject::connect(pictureFlowWidget, SIGNAL(itemActivated(int)), this, SLOT(launchApplication(int)));

    QObject::connect(pictureFlowWidget, SIGNAL(inputReceived()),    this, SLOT(resetInputTimeout()));

    QObject::connect(slideShowWidget,   SIGNAL(inputReceived()),    this, SLOT(switchToLauncher()));

    QObject::connect(inputTimer,        SIGNAL(timeout()),          this, SLOT(inputTimedout()));

    inputTimer->setSingleShot(true);

    inputTimer->setInterval(DEFAULT_INPUT_TIMEOUT);

    const int h = screen_size.height() * SIZING_FACTOR_HEIGHT;

    const int w = screen_size.width() * SIZING_FACTOR_WIDTH;

    const int hh = qMin(h, w);

    const int ww = hh / 3 * 2;

    pictureFlowWidget->setSlideSize(QSize(ww, hh));

    bool success;

    int configIndex = args->indexOf("-config");

    if ( (configIndex != -1) && (configIndex != args->count()-1) )

        success = loadConfig(args->at(configIndex+1));

    else

        success = loadConfig("config.xml");

    if (success) {

      populatePictureFlow();

      showFullScreen();

      inputTimer->start();

    } else {

        pictureFlowWidget->setAttribute(Qt::WA_DeleteOnClose, true);

        pictureFlowWidget->close();

    }

}

FluidLauncher::~FluidLauncher()

{

    delete pictureFlowWidget;

    delete slideShowWidget;

}

bool FluidLauncher::loadConfig(QString configPath)

{

    QFile xmlFile(configPath);

    if (!xmlFile.exists() || (xmlFile.error() != QFile::NoError)) {

        qDebug() << "ERROR: Unable to open config file " << configPath;

        return false;

    }

    slideShowWidget->clearImages();

    xmlFile.open(QIODevice::ReadOnly);

    QXmlStreamReader reader(&xmlFile);

    while (!reader.atEnd()) {

        reader.readNext();

        if (reader.isStartElement()) {

            if (reader.name() == "demos")

                parseDemos(reader);

            else if(reader.name() == "slideshow")

                parseSlideshow(reader);

        }

    }

    if (reader.hasError()) {

       qDebug() << QString("Error parsing %1 on line %2 column %3: \n%4")

                .arg(configPath)

                .arg(reader.lineNumber())

                .arg(reader.columnNumber())

                .arg(reader.errorString());

    }

    // Append an exit Item

    DemoApplication* exitItem = new DemoApplication(QString(), QLatin1String("Exit Embedded Demo"), QString(), QStringList());

    demoList.append(exitItem);

    return true;

}

void FluidLauncher::parseDemos(QXmlStreamReader& reader)

{

    while (!reader.atEnd()) {

        reader.readNext();

        if (reader.isStartElement() && reader.name() == "example") {

            QXmlStreamAttributes attrs = reader.attributes();

            QStringRef filename = attrs.value("filename");

            if (!filename.isEmpty()) {

                QStringRef name = attrs.value("name");

                QStringRef image = attrs.value("image");

                QStringRef args = attrs.value("args");

                DemoApplication* newDemo = new DemoApplication(

                        filename.toString(),

                        name.isEmpty() ? "Unnamed Demo" : name.toString(),

                        image.toString(),

                        args.toString().split(" "));

                demoList.append(newDemo);

            }

        } else if(reader.isEndElement() && reader.name() == "demos") {

            return;

        }

    }

}

void FluidLauncher::parseSlideshow(QXmlStreamReader& reader)

{

    QXmlStreamAttributes attrs = reader.attributes();

    QStringRef timeout = attrs.value("timeout");

    bool valid;

    if (!timeout.isEmpty()) {

        int t = timeout.toString().toInt(&valid);

        if (valid)

            inputTimer->setInterval(t);

    }

    QStringRef interval = attrs.value("interval");

    if (!interval.isEmpty()) {

        int i = interval.toString().toInt(&valid);

        if (valid)

            slideShowWidget->setSlideInterval(i);

    }

    while (!reader.atEnd()) {

        reader.readNext();

        if (reader.isStartElement()) {

            QXmlStreamAttributes attrs = reader.attributes();

            if (reader.name() == "imagedir") {

                QStringRef dir = attrs.value("dir");

                slideShowWidget->addImageDir(dir.toString());

            } else if(reader.name() == "image") {

                QStringRef image = attrs.value("image");

                slideShowWidget->addImage(image.toString());

            }

        } else if(reader.isEndElement() && reader.name() == "slideshow") {

            return;

        }

    }

}

void FluidLauncher::populatePictureFlow()

{

    pictureFlowWidget->setSlideCount(demoList.count());

    for (int i=demoList.count()-1; i>=0; --i) {

        pictureFlowWidget->setSlide(i, *(demoList[i]->getImage()));

        pictureFlowWidget->setSlideCaption(i, demoList[i]->getCaption());

    }

    pictureFlowWidget->setCurrentSlide(demoList.count()/2);

}

void FluidLauncher::launchApplication(int index)

{

    // NOTE: Clearing the caches will free up more memory for the demo but will cause

    // a delay upon returning, as items are reloaded.

    //pictureFlowWidget->clearCaches();

    if (index == demoList.size() -1) {

        qApp->quit();

        return;

    }

    inputTimer->stop();

    QObject::connect(demoList[index], SIGNAL(demoFinished()), this, SLOT(demoFinished()));

    demoList[index]->launch();

}

void FluidLauncher::switchToLauncher()

{

    slideShowWidget->stopShow();

    inputTimer->start();

    setCurrentWidget(pictureFlowWidget);

}

void FluidLauncher::resetInputTimeout()

{

    if (inputTimer->isActive())

        inputTimer->start();

}

void FluidLauncher::inputTimedout()

{

    switchToSlideshow();

}

void FluidLauncher::switchToSlideshow()

{

    inputTimer->stop();

    slideShowWidget->startShow();

    setCurrentWidget(slideShowWidget);

}

void FluidLauncher::demoFinished()

{

    setCurrentWidget(pictureFlowWidget);

    inputTimer->start();

    // Bring the Fluidlauncher to the foreground to allow selecting another demo

    raise();

    activateWindow();

}

void FluidLauncher::changeEvent(QEvent* event)

{

    if (event->type() == QEvent::ActivationChange) {

        if (isActiveWindow()) {

            if(currentWidget() == pictureFlowWidget) {

                resetInputTimeout();

            } else {

                slideShowWidget->startShow();

            }

        } else {

            inputTimer->stop();

            slideShowWidget->stopShow();

        }

    }

    QStackedWidget::changeEvent(event);

}