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#ifndef IMAGEWIDGET_H
#define IMAGEWIDGET_H

#include <QWidget>
#include <QImage>
#include <QPixmap>

#include <QtGui>

#include "tapandholdgesture.h"

class ImageWidget : public QWidget
{
    Q_OBJECT

public:
    ImageWidget(QWidget *parent = 0);

    void openDirectory(const QString &path);

protected:
    void paintEvent(QPaintEvent*);
    void resizeEvent(QResizeEvent*);
    void timerEvent(QTimerEvent*);
    void mousePressEvent(QMouseEvent*);
    void mouseDoubleClickEvent(QMouseEvent*);

private slots:
    void gestureTriggered();
    void gestureFinished();
    void gestureCancelled();

private:
    void updateImage();
    QImage loadImage(const QString &fileName);
    void loadImage();
    void setZoomedIn(bool zoomed);
    void goNextImage();
    void goPrevImage();
    void goToImage(int index);

    QPanGesture *panGesture;
    TapAndHoldGesture *tapAndHoldGesture;

    QString path;
    QStringList files;
    int position;

    QImage prevImage, nextImage;
    QImage currentImage;
    QPixmap pixmap;
    QTransform transformation;

    bool zoomedIn;
    int horizontalOffset;
    int verticalOffset;

    bool zoomed;
    qreal zoom;
    bool rotated;
    qreal angle;

    struct TouchFeedback
    {
        bool tapped;
        QPoint position;
        bool sliding;
        QPoint slidingStartPosition;
        QBasicTimer tapTimer;
        int tapState;
        bool doubleTapped;
        int tapAndHoldState;

        enum { MaximumNumberOfTouches = 5 };
        QPoint touches[MaximumNumberOfTouches];

        inline TouchFeedback() { reset(); }
        inline void reset()
        {
            tapped = false;
            sliding = false;
            tapTimer.stop();
            tapState = 0;
            doubleTapped = false;
            tapAndHoldState = 0;
            for (int i = 0; i < MaximumNumberOfTouches; ++i) {
                touches[i] = QPoint();
            }
        }
    } touchFeedback;
    QBasicTimer feedbackFadeOutTimer;
};

#endif