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#ifndef OPENCV_VIDEOSTAB_MOTION_STABILIZING_HPP
#define OPENCV_VIDEOSTAB_MOTION_STABILIZING_HPP

#include <vector>
#include <utility>
#include "opencv2/core.hpp"
#include "opencv2/videostab/global_motion.hpp"

namespace cv
{
namespace videostab
{

//! @addtogroup videostab_motion
//! @{

class CV_EXPORTS IMotionStabilizer
{
public:
    virtual ~IMotionStabilizer() {}

    //! assumes that [0, size-1) is in or equals to [range.first, range.second)
    virtual void stabilize(
            int size, const std::vector<Mat> &motions, std::pair<int,int> range,
            Mat *stabilizationMotions) = 0;
};

class CV_EXPORTS MotionStabilizationPipeline : public IMotionStabilizer
{
public:
    void pushBack(Ptr<IMotionStabilizer> stabilizer) { stabilizers_.push_back(stabilizer); }
    bool empty() const { return stabilizers_.empty(); }

    virtual void stabilize(
            int size, const std::vector<Mat> &motions, std::pair<int,int> range,
            Mat *stabilizationMotions) CV_OVERRIDE;

private:
    std::vector<Ptr<IMotionStabilizer> > stabilizers_;
};

class CV_EXPORTS MotionFilterBase : public IMotionStabilizer
{
public:
    virtual ~MotionFilterBase() {}

    virtual Mat stabilize(
            int idx, const std::vector<Mat> &motions, std::pair<int,int> range) = 0;

    virtual void stabilize(
            int size, const std::vector<Mat> &motions, std::pair<int,int> range,
            Mat *stabilizationMotions) CV_OVERRIDE;
};

class CV_EXPORTS GaussianMotionFilter : public MotionFilterBase
{
public:
    GaussianMotionFilter(int radius = 15, float stdev = -1.f);

    void setParams(int radius, float stdev = -1.f);
    int radius() const { return radius_; }
    float stdev() const { return stdev_; }

    virtual Mat stabilize(
            int idx, const std::vector<Mat> &motions, std::pair<int,int> range) CV_OVERRIDE;

private:
    int radius_;
    float stdev_;
    std::vector<float> weight_;
};

inline GaussianMotionFilter::GaussianMotionFilter(int _radius, float _stdev) { setParams(_radius, _stdev); }

class CV_EXPORTS LpMotionStabilizer : public IMotionStabilizer
{
public:
    LpMotionStabilizer(MotionModel model = MM_SIMILARITY);

    void setMotionModel(MotionModel val) { model_ = val; }
    MotionModel motionModel() const { return model_; }

    void setFrameSize(Size val) { frameSize_ = val; }
    Size frameSize() const { return frameSize_; }

    void setTrimRatio(float val) { trimRatio_ = val; }
    float trimRatio() const { return trimRatio_; }

    void setWeight1(float val) { w1_ = val; }
    float weight1() const { return w1_; }

    void setWeight2(float val) { w2_ = val; }
    float weight2() const { return w2_; }

    void setWeight3(float val) { w3_ = val; }
    float weight3() const { return w3_; }

    void setWeight4(float val) { w4_ = val; }
    float weight4() const { return w4_; }

    virtual void stabilize(
            int size, const std::vector<Mat> &motions, std::pair<int,int> range,
            Mat *stabilizationMotions) CV_OVERRIDE;

private:
    MotionModel model_;
    Size frameSize_;
    float trimRatio_;
    float w1_, w2_, w3_, w4_;

    std::vector<double> obj_, collb_, colub_;
    std::vector<int> rows_, cols_;
    std::vector<double> elems_, rowlb_, rowub_;

    void set(int row, int col, double coef)
    {
        rows_.push_back(row);
        cols_.push_back(col);
        elems_.push_back(coef);
    }
};

CV_EXPORTS Mat ensureInclusionConstraint(const Mat &M, Size size, float trimRatio);

CV_EXPORTS float estimateOptimalTrimRatio(const Mat &M, Size size);

//! @}

} // namespace videostab
} // namespace

#endif
