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#ifndef QQUICKFREENECTBACKEND_H
#define QQUICKFREENECTBACKEND_H

#include "qquickfreenectvideooutput.h"

#include <QMutex>
#include <QSize>
#include <QThread>
#include <memory>

class QVector3D;
struct _freenect_context;
typedef struct _freenect_context freenect_context;
struct _freenect_device;
typedef struct _freenect_device freenect_device;

class QQuickFreenectBackend : public QThread {
    Q_OBJECT
public:
    static std::shared_ptr<QQuickFreenectBackend> instance();
    ~QQuickFreenectBackend();

    void requestTiltDegrees(double degrees) { m_requestedTiltDegrees = degrees; }
    void requestDepthStreamEnabled() { m_requestedDepthStreamEnabled = true; }
    void requestVideoStreamType(QQuickFreenectVideoOutput::StreamType type) { m_requestedVideoStream = type; }
    unsigned depthFrameId() const { return m_depthFrameId; }
    QQuickFreenectVideoOutput::StreamType requestedVideoStreamType() const { return m_requestedVideoStream; }

    QSize depthBufferSize() const { return {640, 480}; }
    uint16_t *depthBuffer() { return m_depthBuffer; }
    QQuickFreenectVideoOutput::StreamType videoFrontBufferStreamType() const { return m_currentVideoStream; }
    uint8_t *pickVideoFrontBuffer();

    void run() override;

signals:
    void videoFrameReady();
    void depthFrameReady();
    void accelVectorValue(const QVector3D&);
    void errorStringValue(const QString&);

private:
    QQuickFreenectBackend();
    static void depth_cb(freenect_device *dev, void *buffer, uint32_t timestamp);
    static void video_cb(freenect_device *dev, void *buffer, uint32_t timestamp);

    uint8_t *m_videoBack = 0;
    uint8_t *m_videoMid = 0;
    uint8_t *m_videoFront = 0;
    uint16_t *m_depthBuffer = 0;
    double m_requestedTiltDegrees = 0;
    double m_currentTiltDegrees = 0;
    bool m_requestedDepthStreamEnabled = false;
    bool m_currentDepthStreamEnabled = false;
    QQuickFreenectVideoOutput::StreamType m_requestedVideoStream = QQuickFreenectVideoOutput::VideoOff;
    QQuickFreenectVideoOutput::StreamType m_currentVideoStream = QQuickFreenectVideoOutput::VideoOff;
    bool m_gotVideoFrame = false;
    bool m_exitRequested = false;
    unsigned m_depthFrameId = 0;
    QMutex m_mutex;
};

#endif