/*
 *  main.cpp
 *
 *  Matlab interface for writing SVMWeights to an XML file
 *  Input: array (9216x8), ni, mu
 *  Output: nothing to Matlab, creates/overwrites an XML file: SVMWeights_ni_mu.xml
 *
 *  Created by Andrew Salamon on Tue May 9 2006.
 *
 *  Copyright (c) 2006 Machine Perception Laboratory
 *  University of California San Diego.
 *  Please read the license information at the end of this file.
 */

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <iomanip>

//#include <algorithm>
//#include <cctype>
//#include <time.h>

#include <mat.h>
#include <mex.h>

using namespace std;

void writeOneArray( const mxArray *array, string &prefix, int ni, int mu, int prec, string &filename, string &datestamp, string & certVersion );
void writeOneArrayBinary( const mxArray *array, string &prefix, int ni, int mu, int prec );

/** A mex file for creating SVM weights files for use by CERT.
 * This function requires six arguments and can take two optional ones:
 *   -# mxArray: A Matlab array (9216x8).  One slice of the full SVMWeights data
 *   -# int: ni
 *   -# int: mu
 *   -# string: Source file name
 *   -# string: A datestamp
 *   -# string: The CERT version
 *   -# int: The precision to be used for output
 *   -# string: Prefix to be used for the xml file names
 */
void mexFunction(int nlhs,mxArray*plhs[],int nrhs, const mxArray*prhs[])
{
    static string prefix( "SVMWeights" );

	// check number of input/output variables
	if (nlhs != 0 )
		mexErrMsgTxt("SVMExport has no outputs");
	if (nrhs < 3)
		mexErrMsgTxt("SVMExport: requires six inputs: 9216x8 array, ni, mu, source filename, datestamp (as a string), CERT version (as a string). Two extra arguments are allowed an optional precision, and an optional filename prefix string.");

	int ni = static_cast<int>(mxGetScalar(prhs[1]));
	int mu = static_cast<int>(mxGetScalar(prhs[2]));
    string filename( mxArrayToString( prhs[3] ) );
    string datestamp( mxArrayToString( prhs[4] ) );
    string certVersion( mxArrayToString( prhs[5] ) );

	int prec = 6;

    int index = 5;
    if( nrhs > index )
    {
#ifdef DEBUG
        mexWarnMsgTxt("More than six args.");
#endif
        if( mxCHAR_CLASS == mxGetClassID( prhs[index] ) )
        {
            char *str = mxArrayToString( prhs[index] );
#ifdef DEBUG
            mexWarnMsgTxt("Arg six is a string.");
            mexWarnMsgTxt(str);
#endif
            if( strlen( str ) > 0 )
                prefix = str;
        }
        else
        {
            prec = static_cast<int>(mxGetScalar(prhs[index]));
        }
    }

    ++index;
    if( nrhs > index )
    {
#ifdef DEBUG
        mexWarnMsgTxt("More than seven args.");
#endif
        if( mxCHAR_CLASS == mxGetClassID( prhs[index] ) )
        {
            char *str = mxArrayToString( prhs[index] );
#ifdef DEBUG
            mexWarnMsgTxt("Arg seven is a string.");
            mexWarnMsgTxt(str);
#endif
            if( strlen( str ) > 0 )
                prefix = str;
        }
        else
        {
            prec = static_cast<int>(mxGetScalar(prhs[index]));
        }
    }

    writeOneArray( prhs[0], prefix, ni, mu, prec, filename, datestamp, certVersion );
//    writeOneArrayBinary( prhs[0], prefix, ni, mu, prec );
}

void writeOneArray( const mxArray *array, string &prefix, int ni, int mu, int prec, string &filename, string &datestamp, string & certVersion )
{
    double *realArray = mxGetPr(array);

    int rowmax = static_cast<int>(mxGetM(array));
    int colmax = static_cast<int>(mxGetN(array));

    std::ostringstream fNameStream;
    fNameStream << prefix << "_" << ni << "_" << mu << ".xml";
    string fName( fNameStream.str() );

    ofstream file( fName.c_str(), ios::out);

    file << "<?xml version=\"1.0\" encoding=\"UTF-8\"?>" << endl;
//    file << "<svm category=\"" << prefix << "\" ni=\"" << ni << "\" mu=\"" << mu << "\" colcount=\"" << colmax << "\" rowcount=\"" << rowmax << "\"";
    file << "<svm";
    file << " category=\"" << prefix << "\"";
    file << " ni=\"" << ni << "\"";
    file << " mu=\"" << mu << "\"";
    file << " colcount=\"" << colmax << "\"";
    file << " rowcount=\"" << rowmax << "\"";
    file << " file=\"" << filename << "\"";
    file << " date=\"" << datestamp << "\"";
    file << " cert=\"" << certVersion << "\"";
    file << " >" << endl;

    file << setprecision(prec);

    for( int row=0; row<rowmax; ++row )
    {
        file << "<row>";
        for( int col=0; col<colmax; ++col )
        {
            double real = realArray[(col*rowmax)+row]; // realArray[(row*colmax)+col];
            file << real; // file << scientific << real   or  fixed
            if( col != (colmax-1) ) file << " ";
        }
        file << "</row>" << endl;
    }

    file << "</svm>" << endl;
}

void writeOneArrayBinary( const mxArray *array, string &prefix, int ni, int mu, int prec )
{
    double *realArray = mxGetPr(array);

    int rowmax = static_cast<int>(mxGetM(array));
    int colmax = static_cast<int>(mxGetN(array));

    std::ostringstream fNameStream;
    fNameStream << prefix << "_" << ni << "_" << mu << ".xml";
    string fName( fNameStream.str() );

    ofstream file( fName.c_str(), ios::out | ios::binary | ios::trunc );

    file << "SVMWeights category=" << prefix << " ni=" << ni << " mu=" << mu << " colcount=" << colmax << " rowcount=" << rowmax << endl;

    for( int row=0; row<rowmax; ++row )
    {
        double oneRow[8];
        for( int col=0; col<colmax; ++col )
        {
            double real = realArray[(row*colmax)+col];
            oneRow[col] = real;
//            char *bytes = (char *)&real;
//            file << bytes[0] << bytes[1] << bytes[2] << bytes[3] << bytes[4] << bytes[5] << bytes[6] << bytes[7]; ; // file << scientific << real   or  fixed
//            if( col != (colmax-1) ) file << " ";
        }
        file.write( (char *)oneRow, sizeof(double)*8 );
//        file << endl;
    }
}

/*
 *  Copyright (c) 2006 Machine Perception Laboratory
 *  University of California San Diego.
 * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
 *
 *    1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 *    3. The name of the author may not be used to endorse or promote products derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */