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#ifndef OPENCV_VIDEOSTAB_OPTICAL_FLOW_HPP
#define OPENCV_VIDEOSTAB_OPTICAL_FLOW_HPP

#include "opencv2/core.hpp"
#include "opencv2/opencv_modules.hpp"

#ifdef HAVE_OPENCV_CUDAOPTFLOW
  #include "opencv2/cudaoptflow.hpp"
#endif

namespace cv
{
namespace videostab
{

//! @addtogroup videostab
//! @{

class CV_EXPORTS ISparseOptFlowEstimator
{
public:
    virtual ~ISparseOptFlowEstimator() {}
    virtual void run(
            InputArray frame0, InputArray frame1, InputArray points0, InputOutputArray points1,
            OutputArray status, OutputArray errors) = 0;
};

class CV_EXPORTS IDenseOptFlowEstimator
{
public:
    virtual ~IDenseOptFlowEstimator() {}
    virtual void run(
            InputArray frame0, InputArray frame1, InputOutputArray flowX, InputOutputArray flowY,
            OutputArray errors) = 0;
};

class CV_EXPORTS PyrLkOptFlowEstimatorBase
{
public:
    PyrLkOptFlowEstimatorBase() { setWinSize(Size(21, 21)); setMaxLevel(3); }

    virtual void setWinSize(Size val) { winSize_ = val; }
    virtual Size winSize() const { return winSize_; }

    virtual void setMaxLevel(int val) { maxLevel_ = val; }
    virtual int maxLevel() const { return maxLevel_; }
    virtual ~PyrLkOptFlowEstimatorBase() {}

protected:
    Size winSize_;
    int maxLevel_;
};

class CV_EXPORTS SparsePyrLkOptFlowEstimator
        : public PyrLkOptFlowEstimatorBase, public ISparseOptFlowEstimator
{
public:
    virtual void run(
            InputArray frame0, InputArray frame1, InputArray points0, InputOutputArray points1,
            OutputArray status, OutputArray errors);
};

#ifdef HAVE_OPENCV_CUDAOPTFLOW

class CV_EXPORTS SparsePyrLkOptFlowEstimatorGpu
        : public PyrLkOptFlowEstimatorBase, public ISparseOptFlowEstimator
{
public:
    SparsePyrLkOptFlowEstimatorGpu();

    virtual void run(
            InputArray frame0, InputArray frame1, InputArray points0, InputOutputArray points1,
            OutputArray status, OutputArray errors);

    void run(const cuda::GpuMat &frame0, const cuda::GpuMat &frame1, const cuda::GpuMat &points0, cuda::GpuMat &points1,
             cuda::GpuMat &status, cuda::GpuMat &errors);

    void run(const cuda::GpuMat &frame0, const cuda::GpuMat &frame1, const cuda::GpuMat &points0, cuda::GpuMat &points1,
             cuda::GpuMat &status);

private:
    Ptr<cuda::SparsePyrLKOpticalFlow> optFlowEstimator_;
    cuda::GpuMat frame0_, frame1_, points0_, points1_, status_, errors_;
};

class CV_EXPORTS DensePyrLkOptFlowEstimatorGpu
        : public PyrLkOptFlowEstimatorBase, public IDenseOptFlowEstimator
{
public:
    DensePyrLkOptFlowEstimatorGpu();

    virtual void run(
            InputArray frame0, InputArray frame1, InputOutputArray flowX, InputOutputArray flowY,
            OutputArray errors);

private:
    Ptr<cuda::DensePyrLKOpticalFlow> optFlowEstimator_;
    cuda::GpuMat frame0_, frame1_, flowX_, flowY_, errors_;
};

#endif

//! @}

} // namespace videostab
} // namespace cv

#endif