// SpeedGraphWidget unit tests. Lane GUI.
//
// Red when: addSample stops throttling to 1 Hz (a burst of ticks would flood the ring
// buffer and skew the 60 s window), the sample count stops saturating at the window size,
// or painting crashes before two samples have been recorded (the "collecting…" branch).

#include <QtTest>

#include "widgets/SpeedGraphWidget.hpp"

using velox::gui::SpeedGraphWidget;

class TstSpeedGraphWidget : public QObject {
    Q_OBJECT

  private slots:
    void burstsWithinASecondCountOnce();
    void separatedSamplesEachCount();
    void clearResetsCount();
    void paintDoesNotCrashBeforeTwoSamples();
};

void TstSpeedGraphWidget::burstsWithinASecondCountOnce() {
    SpeedGraphWidget w;
    QCOMPARE(w.debugSampleCount(), 0);
    // The first call always records (no prior bucket); the rest land inside the same
    // second and must be coalesced into that one bucket.
    for (int i = 0; i < 20; ++i) {
        w.addSample(1000 + i);
    }
    QCOMPARE(w.debugSampleCount(), 1);
}

void TstSpeedGraphWidget::separatedSamplesEachCount() {
    SpeedGraphWidget w;
    w.addSample(100);
    QCOMPARE(w.debugSampleCount(), 1);
    QTest::qWait(1100);
    w.addSample(200);
    QCOMPARE(w.debugSampleCount(), 2);
    QTest::qWait(1100);
    w.addSample(300);
    QCOMPARE(w.debugSampleCount(), 3);
}

void TstSpeedGraphWidget::clearResetsCount() {
    SpeedGraphWidget w;
    w.addSample(100);
    QTest::qWait(1100);
    w.addSample(200);
    QVERIFY(w.debugSampleCount() > 0);
    w.clear();
    QCOMPARE(w.debugSampleCount(), 0);
}

void TstSpeedGraphWidget::paintDoesNotCrashBeforeTwoSamples() {
    SpeedGraphWidget w;
    w.resize(200, 60);
    const QPixmap empty = w.grab();
    QVERIFY(!empty.isNull());

    w.addSample(500);
    const QPixmap oneSample = w.grab();
    QVERIFY(!oneSample.isNull());

    QTest::qWait(1100);
    w.addSample(700);
    const QPixmap twoSamples = w.grab();
    QVERIFY(!twoSamples.isNull());
}

QTEST_MAIN(TstSpeedGraphWidget)
#include "tst_speedgraphwidget.moc"