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#include <qtest.h>

#include <QtGui>

#include <private/qpaintengineex_p.h>

#include <private/qpaintbuffer_p.h>

//TESTED_FILES=

class ReplayWidget : public QWidget

{

    Q_OBJECT

public:

    ReplayWidget(const QString &filename);

    void paintEvent(QPaintEvent *event);

    void resizeEvent(QResizeEvent *event);

    bool done() const { return m_done; }

    qreal result() const { return m_result; }

public slots:

    void updateRect();

public:

    QList<QRegion> updates;

    QPaintBuffer buffer;

    int currentFrame;

    int currentIteration;

    QTime timer;

    QList<uint> visibleUpdates;

    QList<uint> iterationTimes;

    QString filename;

    bool m_done;

    qreal m_result;

    uint m_total;

};

void ReplayWidget::updateRect()

{

    if (!visibleUpdates.isEmpty())

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

}

void ReplayWidget::paintEvent(QPaintEvent *)

{

    if (m_done)

        return;

    QPainter p(this);

    // if partial updates don't work

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

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

    ++currentFrame;

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

        currentFrame = 0;

        ++currentIteration;

        uint currentElapsed = timer.isNull() ? 0 : timer.elapsed();

        timer.restart();

        m_total += currentElapsed;

        // warm up for at most 5 iterations or half a second

        if (currentIteration >= 5 || m_total >= 500) {

            iterationTimes << currentElapsed;

            if (iterationTimes.size() >= 5) {

                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;

                // do 100 iterations, break earlier if we spend more than 5 seconds or have a low std deviation after 2 seconds

                if (iterationTimes.size() >= 100 || m_total >= 5000 || (m_total >= 2000 && 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);

                    m_result = min;

                    m_done = true;

                    return;

                }

            }

        }

    }

}

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_)

    , m_done(false)

    , m_result(0)

    , m_total(0)

{

    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;

    uint version = 0;

    if (size == 9 && qstrncmp(data, "qttraceV2", 9) == 0) {

        in.setFloatingPointPrecision(QDataStream::SinglePrecision);

        in >> version;

    }

    delete [] data;

    if (!isTraceFile) {

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

        return;

    }

    in >> buffer >> updates;

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

    setAutoFillBackground(false);

    setAttribute(Qt::WA_NoSystemBackground);

}

class tst_QTraceBench : public QObject

{

    Q_OBJECT

private slots:

    void trace();

    void trace_data();

};

static const QLatin1String prefix(":/traces/");

void tst_QTraceBench::trace_data()

{

    QTest::addColumn<QString>("filename");

    QTest::newRow("basicdrawing") << (prefix + "basicdrawing.trace");

    QTest::newRow("webkit") << (prefix + "webkit.trace");

    QTest::newRow("creator") << (prefix + "creator.trace");

    QTest::newRow("textedit") << (prefix + "textedit.trace");

    QTest::newRow("qmlphoneconcept") << (prefix + "qmlphoneconcept.trace");

    QTest::newRow("qmlsamegame") << (prefix + "qmlsamegame.trace");

}

void tst_QTraceBench::trace()

{

    QFETCH(QString, filename);

    QFile file(filename);

    if (!file.exists()) {

        qWarning() << "Missing file" << filename;

        return;

    }

    ReplayWidget widget(filename);

    if (widget.updates.isEmpty()) {

        qWarning() << "No trace updates" << filename;

        return;

    }

    widget.show();

    QTest::qWaitForWindowShown(&widget);

    while (!widget.done()) {

        widget.updateRect();

        QApplication::processEvents();

    }

    QTest::setBenchmarkResult(widget.result(), QTest::WalltimeMilliseconds);

}

QTEST_MAIN(tst_QTraceBench)

#include "tst_qtracebench.moc"