// Convert from OFF format to OpenInventor (.iv) format.

#include <CGAL/IO/Verbose_ostream.h>
#include <CGAL/IO/Inventor_ostream.h>
#include <CGAL/IO/File_writer_inventor.h>
#include <CGAL/IO/generic_copy_OFF.h>
#include <cstddef>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <fstream>

using namespace std;

bool  dummy_switch = false;
bool  verbose      = false;

// main function with standard unix commandline arguments
// ------------------------------------------------------
int main( int argc, char **argv) {
    int n = 0; // number of filenames
    char *filename[2];
    bool help = false;
    for (int i = 1; i < argc; i++) { // check commandline options
	if ( strcmp( "-v", argv[i]) == 0)
	    verbose = true;
	else if ( (strcmp( "-h", argv[i]) == 0) ||
		  (strcmp( "-help", argv[i]) == 0))
	    help = true;
	else if ( n < 2 ) {
	    filename[ n++] = argv[i];
	} else {
	    ++n;
	    break;
	}
    }
    if ((n > 2) || help) {
	if ( ! help)
	    cerr << "Error: in parameter list" << endl;
	cerr << "Usage: " << argv[0] << " [<options>] [<infile> [<outfile>]]"
	     << endl;
	cerr << "       convert a CGAL object (OFF) to Open Inventor .iv "
	        "format." << endl;
	cerr << "       -v      verbose." << endl;
	exit( ! help);
    }

    CGAL::Verbose_ostream vout( verbose);
    vout << argv[0] << ": verbosity on." << endl;

    const char*  iname = "cin";
    istream*     p_in = &cin;
    ifstream     in;
    if ( n > 0) {
	in.open( filename[0]);
	p_in = &in;
	iname = filename[0];
    }
    if ( !*p_in) {
	cerr << argv[0] << ": error: cannot open file '"<< iname
	     << "' for reading." <<endl;
	exit( 1);
    }

    const char*  oname    = "cout";
    ostream*     p_out = &cout;
    ofstream     out;
    if ( n > 1) {
	out.open( filename[1]);
	p_out = &out;
	oname = filename[1];
    }
    if ( !*p_out) {
	cerr << argv[0] << ": error: cannot open file '"<< oname
	     << "' for writing." <<endl;
	exit( 1);
    }

    vout << "CGAL::generic_copy_OFF( " << iname << ", " << oname
	 << ") ...." << endl;
    CGAL::Inventor_ostream os( *p_out);
    CGAL::File_writer_inventor  writer;
    CGAL::generic_copy_OFF( *p_in, *p_out, writer);
    if(!os) return EXIT_FAILURE;
    os.close();
    vout << "    .... done." << endl;

    if ( !*p_in) {
	cerr << argv[0] << " read error: while reading file '"
	     << iname << "'." << endl;
	exit( 1);
    }
    if ( !*p_out) {
	cerr << argv[0] << " write error: while writing file '"
	     << oname << "'." << endl;
	exit( 1);
    }
    return 0;
}
// EOF //