#include "input/PointerTracker.h"

#include <QTest>

using namespace Qt::StringLiterals;
using Gesture = PointerTracker::Gesture;

namespace {

KeyDef letter(const QString &flick = {}, const QStringList &alternates = {})
{
    KeyDef k;
    k.label = u"e"_s;
    k.flick = flick;
    k.alternates = alternates;
    return k;
}

KeyDef ofType(KeyType type)
{
    KeyDef k;
    k.type = type;
    return k;
}

PointerTracker::Config config()
{
    PointerTracker::Config c;
    c.slop = 10;
    c.flickDistance = 30;
    c.trackpadStep = 10;
    c.trackpadRowStep = 40;
    return c;
}

} // namespace

class TestPointerTracker : public QObject
{
    Q_OBJECT

private Q_SLOTS:
    void smallMovementStaysTap()
    {
        PointerTracker t(letter(u"3"_s), {0, 0}, config());
        t.moveTo({5, 8});
        QCOMPARE(t.gesture(), Gesture::Tap);
    }

    void downwardMovementFlicks()
    {
        PointerTracker t(letter(u"3"_s), {0, 0}, config());
        t.moveTo({2, 15});
        QCOMPARE(t.gesture(), Gesture::Flick);
        QCOMPARE(t.flickProgress(), 0.5);
        QVERIFY(!t.flickCommitted());
        t.moveTo({2, 45});
        QVERIFY(t.flickCommitted());
    }

    void flickBackUpUncommits()
    {
        PointerTracker t(letter(u"3"_s), {0, 0}, config());
        t.moveTo({0, 40});
        t.moveTo({0, 5});
        QCOMPARE(t.gesture(), Gesture::Flick);
        QVERIFY(!t.flickCommitted());
    }

    void sidewaysMovementDoesNotFlick()
    {
        PointerTracker t(letter(u"3"_s), {0, 0}, config());
        t.moveTo({30, 15});
        QCOMPARE(t.gesture(), Gesture::Tap);
    }

    void keysWithoutFlickNeverFlick()
    {
        PointerTracker t(letter(), {0, 0}, config());
        t.moveTo({0, 40});
        QCOMPARE(t.gesture(), Gesture::Tap);
    }

    void holdingStillOpensAlternates()
    {
        PointerTracker t(letter({}, {u"é"_s}), {0, 0}, config());
        QVERIFY(t.wantsLongPress());
        QVERIFY(t.longPressElapsed());
        QCOMPARE(t.gesture(), Gesture::LongPress);
    }

    void movingCancelsLongPress()
    {
        PointerTracker t(letter({}, {u"é"_s}), {0, 0}, config());
        t.moveTo({20, 0});
        QVERIFY(!t.longPressElapsed());
        QCOMPARE(t.gesture(), Gesture::Tap);
    }

    void spaceLongPressBecomesTrackpad()
    {
        PointerTracker t(ofType(KeyType::Space), {100, 0}, config());
        QVERIFY(t.longPressElapsed());
        QCOMPARE(t.gesture(), Gesture::Trackpad);

        t.moveTo({125, 0});
        QCOMPARE(t.takeTrackpadSteps(), QPoint(2, 0));
        t.moveTo({131, 0});
        QCOMPARE(t.takeTrackpadSteps(), QPoint(1, 0));
        t.moveTo({95, -45});
        QCOMPARE(t.takeTrackpadSteps(), QPoint(-3, -1));
    }

    void spaceSlideSidewaysMovesAlongTheLine()
    {
        PointerTracker t(ofType(KeyType::Space), {100, 0}, config());
        t.moveTo({112, 5});
        QCOMPARE(t.gesture(), Gesture::Trackpad);
        QCOMPARE(t.takeTrackpadSteps(), QPoint(1, 0)); // the slop counts
        t.moveTo({75, -50});
        QCOMPARE(t.takeTrackpadSteps(), QPoint(-3, 0)); // no line changes
        QVERIFY(!t.longPressElapsed());
    }

    void spaceSlideVerticallyStaysTap()
    {
        PointerTracker t(ofType(KeyType::Space), {100, 0}, config());
        t.moveTo({105, -20});
        QCOMPARE(t.gesture(), Gesture::Tap);
    }

    void spaceSlideNeedsGestures()
    {
        PointerTracker::Config c = config();
        c.gestures = false;
        PointerTracker t(ofType(KeyType::Space), {100, 0}, c);
        t.moveTo({140, 0});
        QCOMPARE(t.gesture(), Gesture::Tap);
    }

    void layerKeySlides()
    {
        PointerTracker t(ofType(KeyType::LayerSwitch), {0, 0}, config());
        t.moveTo({40, -30});
        QCOMPARE(t.gesture(), Gesture::Slide);
    }
};

QTEST_GUILESS_MAIN(TestPointerTracker)
#include "tst_pointertracker.moc"