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#include "test_precomp.hpp"

using namespace cv;
using namespace std;

class Differential
{
public:                
    typedef Mat_<double> mat_t;    

    Differential(double eps_, const mat_t& rv1_, const mat_t& tv1_, const mat_t& rv2_, const mat_t& tv2_) 
        : rv1(rv1_), tv1(tv1_), rv2(rv2_), tv2(tv2_), eps(eps_), ev(3, 1) {}

    void dRv1(mat_t& dr3_dr1, mat_t& dt3_dr1)
    {                
        dr3_dr1.create(3, 3);     dt3_dr1.create(3, 3);
                    
        for(int i = 0; i < 3; ++i) 
        {
            ev.setTo(Scalar(0));    ev(i, 0) = eps;                        
                        
            composeRT( rv1 + ev, tv1, rv2, tv2, rv3_p, tv3_p);            
            composeRT( rv1 - ev, tv1, rv2, tv2, rv3_m, tv3_m);

            dr3_dr1.col(i) = rv3_p - rv3_m;            
            dt3_dr1.col(i) = tv3_p - tv3_m;                         
        }
        dr3_dr1 /= 2 * eps;       dt3_dr1 /= 2 * eps;
    }

    void dRv2(mat_t& dr3_dr2, mat_t& dt3_dr2)
    {                
        dr3_dr2.create(3, 3);     dt3_dr2.create(3, 3);
                    
        for(int i = 0; i < 3; ++i) 
        {
            ev.setTo(Scalar(0));    ev(i, 0) = eps;                        
                        
            composeRT( rv1, tv1, rv2 + ev, tv2, rv3_p, tv3_p);            
            composeRT( rv1, tv1, rv2 - ev, tv2, rv3_m, tv3_m);

            dr3_dr2.col(i) = rv3_p - rv3_m;            
            dt3_dr2.col(i) = tv3_p - tv3_m;                         
        }
        dr3_dr2 /= 2 * eps;       dt3_dr2 /= 2 * eps;
    }

    void dTv1(mat_t& drt3_dt1, mat_t& dt3_dt1)
    {                
        drt3_dt1.create(3, 3);     dt3_dt1.create(3, 3);
                    
        for(int i = 0; i < 3; ++i) 
        {
            ev.setTo(Scalar(0));    ev(i, 0) = eps;                        
                        
            composeRT( rv1, tv1 + ev, rv2, tv2, rv3_p, tv3_p);            
            composeRT( rv1, tv1 - ev, rv2, tv2, rv3_m, tv3_m);

            drt3_dt1.col(i) = rv3_p - rv3_m;            
            dt3_dt1.col(i) = tv3_p - tv3_m;                         
        }
        drt3_dt1 /= 2 * eps;       dt3_dt1 /= 2 * eps;
    }

    void dTv2(mat_t& dr3_dt2, mat_t& dt3_dt2)
    {                
        dr3_dt2.create(3, 3);     dt3_dt2.create(3, 3);
                    
        for(int i = 0; i < 3; ++i) 
        {
            ev.setTo(Scalar(0));    ev(i, 0) = eps;                        
                        
            composeRT( rv1, tv1, rv2, tv2 + ev, rv3_p, tv3_p);            
            composeRT( rv1, tv1, rv2, tv2 - ev, rv3_m, tv3_m);

            dr3_dt2.col(i) = rv3_p - rv3_m;            
            dt3_dt2.col(i) = tv3_p - tv3_m;                         
        }
        dr3_dt2 /= 2 * eps;       dt3_dt2 /= 2 * eps;
    }
     
private:
    const mat_t& rv1, tv1, rv2, tv2;
    double eps;
    Mat_<double> ev;
    
    Differential& operator=(const Differential&);
    Mat rv3_m, tv3_m, rv3_p, tv3_p;          
};

class CV_composeRT_Test : public cvtest::BaseTest
{
public:
    CV_composeRT_Test() {}
    ~CV_composeRT_Test() {}
protected: 
    
    void run(int)
    {
        cvtest::TS& ts = *this->ts;
        ts.set_failed_test_info(cvtest::TS::OK);
        
        Mat_<double> rvec1(3, 1), tvec1(3, 1), rvec2(3, 1), tvec2(3, 1); 

        randu(rvec1, Scalar(0), Scalar(6.29));
        randu(rvec2, Scalar(0), Scalar(6.29));

        randu(tvec1, Scalar(-2), Scalar(2));
        randu(tvec2, Scalar(-2), Scalar(2));
        
        Mat rvec3, tvec3;
        composeRT(rvec1, tvec1, rvec2, tvec2, rvec3, tvec3);
        
        Mat rvec3_exp, tvec3_exp;

        Mat rmat1, rmat2;
        Rodrigues(rvec1, rmat1);
        Rodrigues(rvec2, rmat2);
        Rodrigues(rmat2 * rmat1, rvec3_exp);

        tvec3_exp = rmat2 * tvec1 + tvec2;

        const double thres = 1e-5;
        if (norm(rvec3_exp, rvec3) > thres ||  norm(tvec3_exp, tvec3) > thres)
            ts.set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);

        const double eps = 1e-3;
        Differential diff(eps, rvec1, tvec1, rvec2, tvec2);
     
        Mat dr3dr1, dr3dt1, dr3dr2, dr3dt2, dt3dr1, dt3dt1, dt3dr2, dt3dt2;

        composeRT(rvec1, tvec1, rvec2, tvec2, rvec3, tvec3, 
            dr3dr1, dr3dt1, dr3dr2, dr3dt2, dt3dr1, dt3dt1, dt3dr2, dt3dt2);
        
        Mat_<double> dr3_dr1, dt3_dr1;
           diff.dRv1(dr3_dr1, dt3_dr1);

        if (norm(dr3_dr1, dr3dr1) > thres || norm(dt3_dr1, dt3dr1) > thres)
        {            
            ts.printf( cvtest::TS::LOG, "Invalid derivates by r1\n" );
            ts.set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);
        }

        Mat_<double> dr3_dr2, dt3_dr2;
           diff.dRv2(dr3_dr2, dt3_dr2);

        if (norm(dr3_dr2, dr3dr2) > thres || norm(dt3_dr2, dt3dr2) > thres)
        {            
            ts.printf( cvtest::TS::LOG, "Invalid derivates by r2\n" );
            ts.set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);
        }

        Mat_<double> dr3_dt1, dt3_dt1;
           diff.dTv1(dr3_dt1, dt3_dt1);

        if (norm(dr3_dt1, dr3dt1) > thres || norm(dt3_dt1, dt3dt1) > thres)
        {            
            ts.printf( cvtest::TS::LOG, "Invalid derivates by t1\n" );
            ts.set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);
        }
        
        Mat_<double> dr3_dt2, dt3_dt2;
           diff.dTv2(dr3_dt2, dt3_dt2);

        if (norm(dr3_dt2, dr3dt2) > thres || norm(dt3_dt2, dt3dt2) > thres)
        {            
            ts.printf( cvtest::TS::LOG, "Invalid derivates by t2\n" );
            ts.set_failed_test_info(cvtest::TS::FAIL_BAD_ACCURACY);
        }
    }       
};   
    
TEST(Calib3d_ComposeRT, accuracy) { CV_composeRT_Test test; test.safe_run(); }

