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#include <qtest.h>
#include <QDebug>
#include <QTouchEvent>

#include "qsgitem.h"
#include "qsgcanvas.h"
#include "private/qsgrectangle_p.h"
#include "../../../shared/util.h"

struct TouchEventData {
    QEvent::Type type;
    QWidget *widget;
    Qt::TouchPointStates states;
    QList<QTouchEvent::TouchPoint> touchPoints;
};

static QTouchEvent::TouchPoint makeTouchPoint(QSGItem *item, const QPointF &p, const QPointF &lastPoint = QPointF())
{
    QPointF last = lastPoint.isNull() ? p : lastPoint;

    QTouchEvent::TouchPoint tp;
    tp.setPos(p);
    tp.setLastPos(last);
    tp.setScenePos(item->mapToScene(p));
    tp.setLastScenePos(item->mapToScene(last));
    tp.setScreenPos(item->canvas()->mapToGlobal(tp.scenePos().toPoint()));
    tp.setLastScreenPos(item->canvas()->mapToGlobal(tp.lastScenePos().toPoint()));
    return tp;
}

static TouchEventData makeTouchData(QEvent::Type type, QWidget *w, Qt::TouchPointStates states, const QList<QTouchEvent::TouchPoint> &touchPoints)
{
    TouchEventData d = { type, w, states, touchPoints };
    return d;
}

static TouchEventData makeTouchData(QEvent::Type type, QWidget *w, Qt::TouchPointStates states, const QTouchEvent::TouchPoint &touchPoint)
{
    QList<QTouchEvent::TouchPoint> points;
    points << touchPoint;
    return makeTouchData(type, w, states, points);
}

#define COMPARE_TOUCH_POINTS(tp1, tp2) \
{ \
    QCOMPARE(tp1.pos(), tp2.pos()); \
    QCOMPARE(tp1.lastPos(), tp2.lastPos()); \
    QCOMPARE(tp1.scenePos(), tp2.scenePos()); \
    QCOMPARE(tp1.lastScenePos(), tp2.lastScenePos()); \
    QCOMPARE(tp1.screenPos(), tp2.screenPos()); \
    QCOMPARE(tp1.lastScreenPos(), tp2.lastScreenPos()); \
}

#define COMPARE_TOUCH_DATA(d1, d2) \
{ \
    QCOMPARE((int)d1.type, (int)d2.type); \
    QCOMPARE(d1.widget, d2.widget); \
    QCOMPARE((int)d1.states, (int)d2.states); \
    QCOMPARE(d1.touchPoints.count(), d2.touchPoints.count()); \
    for (int i=0; i<d1.touchPoints.count(); i++) { \
        COMPARE_TOUCH_POINTS(d1.touchPoints[i], d2.touchPoints[i]); \
    } \
}

class TestTouchItem : public QSGRectangle
{
    Q_OBJECT
public:
    TestTouchItem(QSGItem *parent = 0)
        : QSGRectangle(parent), acceptEvents(true)
    {
        border()->setWidth(1);
    }

    void reset() {
        acceptEvents = true;
        setEnabled(true);
        setOpacity(1.0);

        lastEvent = makeTouchData(QEvent::None, 0, 0, QList<QTouchEvent::TouchPoint>());
    }

    bool acceptEvents;
    TouchEventData lastEvent;

protected:
    virtual void touchEvent(QTouchEvent *event) {
        if (!acceptEvents) {
            event->ignore();
            return;
        }
        lastEvent = makeTouchData(event->type(), event->widget(), event->touchPointStates(), event->touchPoints());
        event->accept();
    }
};


class ConstantUpdateItem : public QSGItem
{
Q_OBJECT
public:
    ConstantUpdateItem(QSGItem *parent = 0) : QSGItem(parent), iterations(0) {setFlag(ItemHasContents);}

    int iterations;
protected:
    QSGNode* updatePaintNode(QSGNode *, UpdatePaintNodeData *){
        iterations++;
        update();
        return 0;
    }
};

class tst_qsgcanvas : public QObject
{
    Q_OBJECT
public:
    tst_qsgcanvas();

private slots:
    void initTestCase();
    void cleanupTestCase();

    void constantUpdates();

    void touchEvent_basic();
    void touchEvent_propagation();
    void touchEvent_propagation_data();

    void clearCanvas();
};

tst_qsgcanvas::tst_qsgcanvas()
{
}

void tst_qsgcanvas::initTestCase()
{
}

void tst_qsgcanvas::cleanupTestCase()
{
}

//If the item calls update inside updatePaintNode, it should schedule another update
void tst_qsgcanvas::constantUpdates()
{
    QSGCanvas canvas;
    ConstantUpdateItem item(canvas.rootItem());
    canvas.show();
    QTRY_VERIFY(item.iterations > 60);
}

void tst_qsgcanvas::touchEvent_basic()
{
    QSGCanvas *canvas = new QSGCanvas;
    canvas->resize(250, 250);
    canvas->window()->move(100, 100);
    canvas->show();

    TestTouchItem *bottomItem = new TestTouchItem(canvas->rootItem());
    bottomItem->setObjectName("Bottom Item");
    bottomItem->setSize(QSizeF(150, 150));

    TestTouchItem *middleItem = new TestTouchItem(bottomItem);
    middleItem->setObjectName("Middle Item");
    middleItem->setPos(QPointF(50, 50));
    middleItem->setSize(QSizeF(150, 150));

    TestTouchItem *topItem = new TestTouchItem(middleItem);
    topItem->setObjectName("Top Item");
    topItem->setPos(QPointF(50, 50));
    topItem->setSize(QSizeF(150, 150));

    QPointF pos(10, 10);

    // press single point
    QTest::touchEvent(canvas).press(0, topItem->mapToScene(pos).toPoint());
    QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);
    QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
    QVERIFY(bottomItem->lastEvent.touchPoints.isEmpty());
    COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed, makeTouchPoint(topItem, pos)));
    topItem->reset();

    // press multiple points
    QTest::touchEvent(canvas).press(0, topItem->mapToScene(pos).toPoint())
                             .press(1, bottomItem->mapToScene(pos).toPoint());
    QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);
    QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
    QCOMPARE(bottomItem->lastEvent.touchPoints.count(), 1);
    COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed, makeTouchPoint(topItem, pos)));
    COMPARE_TOUCH_DATA(bottomItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed, makeTouchPoint(bottomItem, pos)));
    topItem->reset();
    bottomItem->reset();

    // touch point on top item moves to bottom item, but top item should still receive the event
    QTest::touchEvent(canvas).press(0, topItem->mapToScene(pos).toPoint());
    QTest::touchEvent(canvas).move(0, bottomItem->mapToScene(pos).toPoint());
    QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);
    COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchUpdate, canvas, Qt::TouchPointMoved,
            makeTouchPoint(topItem, topItem->mapFromItem(bottomItem, pos), pos)));
    topItem->reset();

    // touch point on bottom item moves to top item, but bottom item should still receive the event
    QTest::touchEvent(canvas).press(0, bottomItem->mapToScene(pos).toPoint());
    QTest::touchEvent(canvas).move(0, topItem->mapToScene(pos).toPoint());
    QCOMPARE(bottomItem->lastEvent.touchPoints.count(), 1);
    COMPARE_TOUCH_DATA(bottomItem->lastEvent, makeTouchData(QEvent::TouchUpdate, canvas, Qt::TouchPointMoved,
            makeTouchPoint(bottomItem, bottomItem->mapFromItem(topItem, pos), pos)));
    bottomItem->reset();

    // a single stationary press on an item shouldn't cause an event
    QTest::touchEvent(canvas).press(0, topItem->mapToScene(pos).toPoint());
    QTest::touchEvent(canvas).stationary(0)
                             .press(1, bottomItem->mapToScene(pos).toPoint());
    QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);    // received press only, not stationary
    QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
    QCOMPARE(bottomItem->lastEvent.touchPoints.count(), 1);
    COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed, makeTouchPoint(topItem, pos)));
    COMPARE_TOUCH_DATA(bottomItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed, makeTouchPoint(bottomItem, pos)));
    topItem->reset();
    bottomItem->reset();

    // move touch point from top item to bottom, and release
    QTest::touchEvent(canvas).press(0, topItem->mapToScene(pos).toPoint());
    QTest::touchEvent(canvas).release(0, bottomItem->mapToScene(pos).toPoint());
    QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);
    COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchEnd, canvas, Qt::TouchPointReleased,
            makeTouchPoint(topItem, topItem->mapFromItem(bottomItem, pos), pos)));
    topItem->reset();

    // release while another point is pressed
    QTest::touchEvent(canvas).press(0, topItem->mapToScene(pos).toPoint())
                             .press(1, bottomItem->mapToScene(pos).toPoint());
    QTest::touchEvent(canvas).move(0, bottomItem->mapToScene(pos).toPoint());
    QTest::touchEvent(canvas).release(0, bottomItem->mapToScene(pos).toPoint())
                             .stationary(1);
    QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);
    QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
    QCOMPARE(bottomItem->lastEvent.touchPoints.count(), 1);
    COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchEnd, canvas, Qt::TouchPointReleased,
            makeTouchPoint(topItem, topItem->mapFromItem(bottomItem, pos))));
    COMPARE_TOUCH_DATA(bottomItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed, makeTouchPoint(bottomItem, pos)));
    topItem->reset();
    bottomItem->reset();

    delete topItem;
    delete middleItem;
    delete bottomItem;
    delete canvas;
}

void tst_qsgcanvas::touchEvent_propagation()
{
    QFETCH(bool, acceptEvents);
    QFETCH(bool, enableItem);
    QFETCH(qreal, itemOpacity);

    QSGCanvas *canvas = new QSGCanvas;
    canvas->resize(250, 250);
    canvas->window()->move(100, 100);
    canvas->show();

    TestTouchItem *bottomItem = new TestTouchItem(canvas->rootItem());
    bottomItem->setObjectName("Bottom Item");
    bottomItem->setSize(QSizeF(150, 150));

    TestTouchItem *middleItem = new TestTouchItem(bottomItem);
    middleItem->setObjectName("Middle Item");
    middleItem->setPos(QPointF(50, 50));
    middleItem->setSize(QSizeF(150, 150));

    TestTouchItem *topItem = new TestTouchItem(middleItem);
    topItem->setObjectName("Top Item");
    topItem->setPos(QPointF(50, 50));
    topItem->setSize(QSizeF(150, 150));

    QPointF pos(10, 10);
    QPoint pointInBottomItem = bottomItem->mapToScene(pos).toPoint();  // (10, 10)
    QPoint pointInMiddleItem = middleItem->mapToScene(pos).toPoint();  // (60, 60) overlaps with bottomItem
    QPoint pointInTopItem = topItem->mapToScene(pos).toPoint();  // (110, 110) overlaps with bottom & top items

    // disable topItem
    topItem->acceptEvents = acceptEvents;
    topItem->setEnabled(enableItem);
    topItem->setOpacity(itemOpacity);

    // single touch to top item, should be received by middle item
    QTest::touchEvent(canvas).press(0, pointInTopItem);
    QVERIFY(topItem->lastEvent.touchPoints.isEmpty());
    QCOMPARE(middleItem->lastEvent.touchPoints.count(), 1);
    QVERIFY(bottomItem->lastEvent.touchPoints.isEmpty());
    COMPARE_TOUCH_DATA(middleItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed,
            makeTouchPoint(middleItem, middleItem->mapFromItem(topItem, pos))));

    // touch top and middle items, middle item should get both events
    QTest::touchEvent(canvas).press(0, pointInTopItem)
                             .press(1, pointInMiddleItem);
    QVERIFY(topItem->lastEvent.touchPoints.isEmpty());
    QCOMPARE(middleItem->lastEvent.touchPoints.count(), 2);
    QVERIFY(bottomItem->lastEvent.touchPoints.isEmpty());
    COMPARE_TOUCH_DATA(middleItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed,
            (QList<QTouchEvent::TouchPoint>() << makeTouchPoint(middleItem, middleItem->mapFromItem(topItem, pos))
                                              << makeTouchPoint(middleItem, pos) )));
    middleItem->reset();

    // disable middleItem as well
    middleItem->acceptEvents = acceptEvents;
    middleItem->setEnabled(enableItem);
    middleItem->setOpacity(itemOpacity);

    // touch top and middle items, bottom item should get all events
    QTest::touchEvent(canvas).press(0, pointInTopItem)
                             .press(1, pointInMiddleItem);
    QVERIFY(topItem->lastEvent.touchPoints.isEmpty());
    QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
    QCOMPARE(bottomItem->lastEvent.touchPoints.count(), 2);
    COMPARE_TOUCH_DATA(bottomItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed,
            (QList<QTouchEvent::TouchPoint>() << makeTouchPoint(bottomItem, bottomItem->mapFromItem(topItem, pos))
                                              << makeTouchPoint(bottomItem, bottomItem->mapFromItem(middleItem, pos)) )));
    bottomItem->reset();

    // disable bottom item as well
    bottomItem->acceptEvents = acceptEvents;
    bottomItem->setEnabled(enableItem);
    bottomItem->setOpacity(itemOpacity);

    // no events should be received
    QTest::touchEvent(canvas).press(0, pointInTopItem)
                             .press(1, pointInMiddleItem)
                             .press(2, pointInBottomItem);
    QVERIFY(topItem->lastEvent.touchPoints.isEmpty());
    QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
    QVERIFY(bottomItem->lastEvent.touchPoints.isEmpty());

    topItem->reset();
    middleItem->reset();
    bottomItem->reset();

    // disable middle item, touch on top item
    middleItem->acceptEvents = acceptEvents;
    middleItem->setEnabled(enableItem);
    middleItem->setOpacity(itemOpacity);
    QTest::touchEvent(canvas).press(0, pointInTopItem);
    if (!enableItem || itemOpacity == 0) {
        // middle item is disabled or has 0 opacity, bottom item receives the event
        QVERIFY(topItem->lastEvent.touchPoints.isEmpty());
        QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
        QCOMPARE(bottomItem->lastEvent.touchPoints.count(), 1);
        COMPARE_TOUCH_DATA(bottomItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed,
                makeTouchPoint(bottomItem, bottomItem->mapFromItem(topItem, pos))));
    } else {
        // middle item ignores event, sends it to the top item (top-most child)
        QCOMPARE(topItem->lastEvent.touchPoints.count(), 1);
        QVERIFY(middleItem->lastEvent.touchPoints.isEmpty());
        QVERIFY(bottomItem->lastEvent.touchPoints.isEmpty());
        COMPARE_TOUCH_DATA(topItem->lastEvent, makeTouchData(QEvent::TouchBegin, canvas, Qt::TouchPointPressed,
                makeTouchPoint(topItem, pos)));
    }

    delete topItem;
    delete middleItem;
    delete bottomItem;
    delete canvas;
}

void tst_qsgcanvas::touchEvent_propagation_data()
{
    QTest::addColumn<bool>("acceptEvents");
    QTest::addColumn<bool>("enableItem");
    QTest::addColumn<qreal>("itemOpacity");

    QTest::newRow("disable events") << false << true << 1.0;
    QTest::newRow("disable item") << true << false << 1.0;
    QTest::newRow("opacity of 0") << true << true << 0.0;
}

void tst_qsgcanvas::clearCanvas()
{
    QSGCanvas *canvas = new QSGCanvas;
    QSGItem *item = new QSGItem;
    item->setParentItem(canvas->rootItem());

    QVERIFY(item->canvas() == canvas);

    delete canvas;

    QVERIFY(item->canvas() == 0);

    delete item;
}



QTEST_MAIN(tst_qsgcanvas)

#include "tst_qsgcanvas.moc"