// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0

#ifndef QDECLARATIVEPINCHGENERATOR_H
#define QDECLARATIVEPINCHGENERATOR_H

#include <QtQuick/QQuickItem>
#include <QtQuick/QQuickWindow>
#include <QtGui/QMouseEvent>
#include <QtGui/QTouchEvent>
#include <QtGui/QKeyEvent>
#include <QtGui/QPointingDevice>
#include <QtCore/QElapsedTimer>
#include <QtCore/QList>
#include <QtCore/QPoint>
#include <QDebug>

#define SWIPES_REQUIRED 2

QT_BEGIN_NAMESPACE

typedef struct {
    QList<QPoint> touchPoints;
    QList<int> durations;
} Swipe;

class QDeclarativePinchGenerator : public QQuickItem
{
    Q_OBJECT

    Q_PROPERTY(bool enabled READ enabled WRITE setEnabled NOTIFY enabledChanged)
    Q_PROPERTY(QString state READ state NOTIFY stateChanged)
    Q_PROPERTY(qreal replaySpeedFactor READ replaySpeedFactor WRITE setReplaySpeedFactor NOTIFY replaySpeedFactorChanged)
    Q_PROPERTY(QQuickItem* target READ target WRITE setTarget NOTIFY targetChanged)
    Q_INTERFACES(QQmlParserStatus)

public:
    QDeclarativePinchGenerator();
    ~QDeclarativePinchGenerator();

    QString state() const;
    QQuickItem* target() const;
    void setTarget(QQuickItem* target);
    qreal replaySpeedFactor() const;
    void setReplaySpeedFactor(qreal factor);
    bool enabled() const;
    void setEnabled(bool enabled);

    Q_INVOKABLE void replay();
    Q_INVOKABLE void clear();
    Q_INVOKABLE void stop();
    Q_INVOKABLE int startDragDistance();

    // programmatic interface, useful for autotests
    Q_INVOKABLE void pinch(QPoint point1From,
                           QPoint point1To,
                           QPoint point2From,
                           QPoint point2To,
                           int interval1 = 20,
                           int interval2 = 20,
                           int samples1 = 10,
                           int samples2 = 10);

    Q_INVOKABLE void pinchPress(QPoint point1From, QPoint point2From);
    Q_INVOKABLE void pinchMoveTo(QPoint point1To, QPoint point2To);
    Q_INVOKABLE void pinchRelease(QPoint point1To, QPoint point2To);

signals:
    void stateChanged();
    void targetChanged();
    void replaySpeedFactorChanged();
    void enabledChanged();

public:
    enum GeneratorState {
        Invalid    = 0,
        Idle       = 1,
        Recording  = 2,
        Replaying  = 3
    };

    // from QQmlParserStatus
    void componentComplete() override;
    // from QQuickItem
    void itemChange(ItemChange change, const ItemChangeData &data) override;

protected:
    void mousePressEvent(QMouseEvent *event) override;
    void mouseReleaseEvent(QMouseEvent *event) override;
    void mouseDoubleClickEvent(QMouseEvent *event) override;
    void mouseMoveEvent(QMouseEvent *event) override;
    void keyPressEvent(QKeyEvent *event) override;
    void timerEvent(QTimerEvent *event) override;

private:
    void setState(GeneratorState state);

private:
    QQuickItem* target_;
    GeneratorState state_;
    QQuickWindow* window_;
    QList<Swipe*> swipes_;
    Swipe* activeSwipe_;
    QElapsedTimer swipeTimer_;
    int replayTimer_;
    int replayBookmark_;
    int masterSwipe_;
    qreal replaySpeedFactor_;
    bool enabled_;
    QPointingDevice *device_;
};

QT_END_NAMESPACE

#endif