/********************************************************
Authors: Sukul Bagai, Abhilasha Sancheti, Shubheksha Jalan 
********************************************************/

#include <numeric>
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include "opencv2/opencv.hpp"
#include <iostream>
using namespace cv;
using namespace std;
extern "C"
{
  #include "api_scilab.h"
  #include "Scierror.h"
  #include "BOOL.h"
  #include <localization.h>
  #include <sciprint.h>
  #include "../common.h"
  int opencv_canny(char *fname, unsigned long fname_len)
  {

    SciErr sciErr;
    int intErr = 0;
    int iRows=0,iCols=0;
    int *piAddr = NULL;
    int *piAddrNew = NULL;
    int *piAddr2  = NULL;
    int *piAddr3  = NULL;
    int *piAddr4  = NULL;
    int *piAddr5  = NULL;
    int i,j,k;
    double aperture, threshold1, threshold2, gradient;
    bool L2gradient = false;

    //checking input argument
    CheckInputArgument(pvApiCtx, 5, 5);
    CheckOutputArgument(pvApiCtx, 1, 1) ;


    Mat image;
    retrieveImage(image, 1); 
    cvtColor( image, image, CV_BGR2GRAY );

    //for value of threshold1
    sciErr = getVarAddressFromPosition(pvApiCtx,2,&piAddr2);
    if (sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }
   intErr = getScalarDouble(pvApiCtx, piAddr2, &threshold1);
     if(intErr)
    {
        return intErr;
    }   


    //for value of threshold2
    sciErr = getVarAddressFromPosition(pvApiCtx,3,&piAddr3);
    if (sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }
   intErr = getScalarDouble(pvApiCtx, piAddr3, &threshold2);
     if(intErr)
    {
        return intErr;
    }   


    //for value of aperture
    sciErr = getVarAddressFromPosition(pvApiCtx,4,&piAddr4);
    if (sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }
    intErr = getScalarDouble(pvApiCtx, piAddr4, &aperture);
     if(intErr)
    {
        return intErr;
    }   


    //for value of gradient as an integer and convert to bool accordingly
    sciErr = getVarAddressFromPosition(pvApiCtx,5,&piAddr5);
    if (sciErr.iErr)
    {
        printError(&sciErr, 0);
        return 0;
    }
    intErr = getScalarDouble(pvApiCtx, piAddr5, &gradient);
     if(intErr)
    {
        return intErr;
    }   

    if ( gradient == 1){
        L2gradient = true;
    }
    Mat new_image;
    Canny(image, new_image, threshold1, threshold2, aperture, L2gradient);

    string tempstring = type2str(new_image.type());
    char *checker;
    checker = (char *)malloc(tempstring.size() + 1);
    memcpy(checker, tempstring.c_str(), tempstring.size() + 1);
    returnImage(checker,new_image,1);
    free(checker); 

    //Assigning the list as the Output Variable
    AssignOutputVariable(pvApiCtx, 1) = nbInputArgument(pvApiCtx) + 1;
    //Returning the Output Variables as arguments to the Scilab environment
    ReturnArguments(pvApiCtx);
    return 0;

  }
/* ==================================================================== */
}