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#include <QtGui>

#include <QtDebug>

#include <private/qpaintengineex_p.h>

#include <private/qpaintbuffer_p.h>

class ReplayWidget : public QWidget

{

    Q_OBJECT

public:

    ReplayWidget(const QString &filename);

    void paintEvent(QPaintEvent *event);

    void resizeEvent(QResizeEvent *event);

public slots:

    void updateRect();

public:

    QList<QRegion> updates;

    QPaintBuffer buffer;

    int currentFrame;

    int currentIteration;

    QTime timer;

    QList<uint> visibleUpdates;

    QList<uint> iterationTimes;

    QString filename;

};

void ReplayWidget::updateRect()

{

    if (!visibleUpdates.isEmpty())

        update(updates.at(visibleUpdates.at(currentFrame)));

}

void ReplayWidget::paintEvent(QPaintEvent *)

{

    QPainter p(this);

//    p.setClipRegion(frames.at(currentFrame).updateRegion);

    buffer.draw(&p, visibleUpdates.at(currentFrame));

    ++currentFrame;

    if (currentFrame >= visibleUpdates.size()) {

        currentFrame = 0;

        ++currentIteration;

        if (currentIteration == 3)

            timer.start();

        else if (currentIteration > 3) {

            iterationTimes << timer.elapsed();

            timer.restart();

            if (iterationTimes.size() >= 3) {

                qreal mean = 0;

                qreal stddev = 0;

                uint min = INT_MAX;

                for (int i = 0; i < iterationTimes.size(); ++i) {

                    mean += iterationTimes.at(i);

                    min = qMin(min, iterationTimes.at(i));

                }

                mean /= qreal(iterationTimes.size());

                for (int i = 0; i < iterationTimes.size(); ++i) {

                    qreal delta = iterationTimes.at(i) - mean;

                    stddev += delta * delta;

                }

                stddev = qSqrt(stddev / iterationTimes.size());

                qSort(iterationTimes.begin(), iterationTimes.end());

                uint median = iterationTimes.at(iterationTimes.size() / 2);

                stddev = 100 * stddev / mean;

                if (iterationTimes.size() >= 10 || stddev < 4) {

                    printf("%s, iterations: %d, frames: %d, min(ms): %d, median(ms): %d, stddev: %f %%, max(fps): %f\n", qPrintable(filename),

                            iterationTimes.size(), visibleUpdates.size(), min, median, stddev, 1000. * visibleUpdates.size() / min);

                    deleteLater();

                    return;

                }

            }

        }

    }

    QTimer::singleShot(0, this, SLOT(updateRect()));

}

void ReplayWidget::resizeEvent(QResizeEvent *event)

{

    visibleUpdates.clear();

    QRect bounds = rect();

    for (int i = 0; i < updates.size(); ++i) {

        if (updates.at(i).intersects(bounds))

            visibleUpdates << i;

    }

    if (visibleUpdates.size() != updates.size())

        printf("Warning: skipped %d frames due to limited resolution\n", updates.size() - visibleUpdates.size());

}

ReplayWidget::ReplayWidget(const QString &filename_)

    : currentFrame(0)

    , currentIteration(0)

    , filename(filename_)

{

    setWindowTitle(filename);

    QFile file(filename);

    if (!file.open(QIODevice::ReadOnly)) {

        printf("Failed to load input file '%s'\n", qPrintable(filename_));

        return;

    }

    QDataStream in(&file);

    char *data;

    uint size;

    in.readBytes(data, size);

    bool isTraceFile = size == 7 && qstrncmp(data, "qttrace", 7) == 0;

    delete [] data;

    if (!isTraceFile) {

        printf("File '%s' is not a trace file\n", qPrintable(filename_));

        return;

    }

    in >> buffer >> updates;

    printf("Read paint buffer with %d frames\n", buffer.numFrames());

    resize(buffer.boundingRect().size().toSize());

    setAutoFillBackground(false);

    setAttribute(Qt::WA_NoSystemBackground);

    QTimer::singleShot(10, this, SLOT(updateRect()));

}

int main(int argc, char **argv)

{

    QApplication app(argc, argv);

    if (argc <= 1 || qstrcmp(argv[1], "-h") == 0 || qstrcmp(argv[1], "--help") == 0) {

        printf("Replays a tracefile generated with '-graphicssystem trace'\n");

        printf("Usage:\n  > %s [traceFile]\n", argv[0]);

        return 1;

    }

    QFile file(argv[1]);

    if (!file.exists()) {

        printf("%s does not exist\n", argv[1]);

        return 1;

    }

    ReplayWidget *widget = new ReplayWidget(argv[1]);

    if (!widget->updates.isEmpty()) {

        widget->show();

        return app.exec();

    }

}

#include "main.moc"