//===========================================================================
// Copyright (C) 1998, 2000-2007, 2010, 2011, 2012 SINTEF ICT, Applied
// Mathematics, Norway.
//
// This file is part of GoTools
//
// This program is free software; you can redistribute it and/or          
// modify it under the terms of the GNU General Public License            
// as published by the Free Software Foundation version 2 of the License. 
//
// This program is distributed in the hope that it will be useful,        
// but WITHOUT ANY WARRANTY; without even the implied warranty of         
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          
// GNU General Public License for more details.                           
//
// You should have received a copy of the GNU General Public License      
// along with this program; if not, see <http://www.gnu.org/licenses>
//
// Contact information: E-mail: tor.dokken@sintef.no                      
// SINTEF ICT, Department of Applied Mathematics,                         
// P.O. Box 124 Blindern,                                                 
// 0314 Oslo, Norway.                                                     
//
// Other licenses are also available for this software, notably licenses
// for:
// - Building commercial software.                                        
// - Building software whose source code you wish to keep private.        
//===========================================================================

#include <iostream>
#include <fstream>
#include <string>
#include <stdexcept>
#include <cstdlib>

#include "sisl.h"
#include "GoReadWrite.h"

using namespace std;


namespace {
    string OUT_FILE_POINTS = "example2_points.g2";
    string OUT_FILE_CURVE  = "example2_curve.g2";

    string DESCRIPTION = 
    "This program will generate a SISL spline curve object by \n"
    "interpolating a set of given points.  The parametrization \n"
    "will be calculated automatically.  No derivative \n"
    "information is provided.  The routine used is 's1356'. The \n"
    "points will be written in Go-format to the file: \n'" 
    + OUT_FILE_POINTS + "'.  The resulting curve will be written \n"
    "in Go-format to the file: '" + OUT_FILE_CURVE + "'\n";

    const int num_points = 6;
    const double cstartpar = 0;

    int type[] = {1, 1, 1, 1, 1, 1};

    double points[] = {0, 0, 0,
		       1, 1, 0,
		       2, -1, 0,
		       3, 0, 0,
		       4, 1, 1,
		       3, 0, 4};
}; // end anonymous namespace 

//===========================================================================
int main(int avnum, char** vararg)
//===========================================================================
{
    cout << '\n' << vararg[0] << ":\n" << DESCRIPTION << endl;
    cout << "To proceed, press enter, or ^C to quit." << endl;
    getchar();


    try {

	double cendpar;
	SISLCurve* result_curve = 0;
	double* gpar = 0;
	int jnbpar;
	int jstat;

	s1356(points,        // pointer to where the point coordinates are stored
	      num_points,    // number of points to be interpolated
	      3,             // the dimension
	      type,          // what type of information is stored at a particular point
	      0,             // no additional condition at start point
	      0,             // no additional condition at end point
	      1,             // open curve
	      4,             // order of the spline curve to be produced
	      cstartpar,     // parameter value to be used at start of curve
	      &cendpar,      // parameter value at the end of the curve (to be determined)
	      &result_curve, // the resulting spline curve (to be determined)
	      &gpar,         // pointer to the parameter values of the points in the curve
	                     // (to be determined)
	      &jnbpar,       // number of unique parameter values (to be determined)
	      &jstat);       // status message

	if (jstat < 0) {
	    throw runtime_error("Error occured inside call to SISL routine.");
	} else if (jstat > 0) {
	    cerr << "WARNING: warning occured inside call to SISL routine. \n" << endl;
	}
	      
	cout << "Total parameter interval of curve: [" << cstartpar << ", " 
	     << cendpar << "]\n\n";
	cout << "Point parameter values was decided to be: \n";
	for (int i = 0; i < num_points; ++i) {
	    cout << gpar[i] << ' ';
	}
	cout << endl;

	ofstream os_points(OUT_FILE_POINTS.c_str());
	ofstream os_curve(OUT_FILE_CURVE.c_str());
	if (!os_points || !os_curve) {
	    throw runtime_error("Unable to open output file.");
	}

	// write result to file
	writeGoPoints(num_points, points, os_points);
	writeGoCurve(result_curve, os_curve);
	
	// cleaning up
	freeCurve(result_curve);
	free(gpar);
	os_points.close();
	os_curve.close();

    } catch (exception& e) {
	cerr << "Exception thrown: " << e.what() << endl;
	return 0;
    }

    return 1;
};
