/**Function*************************************************************

  Synopsis    [Command procedure to allow for static BDD variable ordering.]

  Description [This procedure should be integrated in "abc\src\base\abci\abc.c"
  similar to how procedure Abc_CommandReorder() is currently integrated.]
               
  SideEffects []

  SeeAlso     []

***********************************************************************/
int Abc_CommandOrder( Abc_Frame_t * pAbc, int argc, char ** argv )
{
    FILE * pOut, * pErr, * pFile;
    Abc_Ntk_t * pNtk;
    char * pFileName;
    int c;
    int fReverse;
    int fVerbose;
    extern void Abc_NtkImplementCiOrder( Abc_Ntk_t * pNtk, char * pFileName, int fReverse, int fVerbose );
    extern void Abc_NtkFindCiOrder( Abc_Ntk_t * pNtk, int fReverse, int fVerbose );

    pNtk = Abc_FrameReadNtk(pAbc);
    pOut = Abc_FrameReadOut(pAbc);
    pErr = Abc_FrameReadErr(pAbc);

    // set defaults
    fReverse = 0;
    fVerbose = 0;
    Extra_UtilGetoptReset();
    while ( ( c = Extra_UtilGetopt( argc, argv, "rvh" ) ) != EOF )
    {
        switch ( c )
        {
        case 'r':
            fReverse ^= 1;
            break;
        case 'v':
            fVerbose ^= 1;
            break;
        case 'h':
            goto usage;
        default:
            goto usage;
        }
    }

    if ( pNtk == NULL )
    {
        fprintf( pErr, "Empty network.\n" );
        return 1;
    }

    // if the var order file is given, implement this order
    pFileName = NULL;
    if ( argc == globalUtilOptind + 1 )
    {
        pFileName = argv[globalUtilOptind];
        pFile = fopen( pFileName, "r" );
        if ( pFile == NULL )
        {
            fprintf( pErr, "Cannot open file \"%s\" with the BDD variable order.\n", pFileName );
            return 1;
        }
        fclose( pFile );
    }
    if ( pFileName )
        Abc_NtkImplementCiOrder( pNtk, pFileName, fReverse, fVerbose );
    else
        Abc_NtkFindCiOrder( pNtk, fReverse, fVerbose );
    return 0;

usage:
    fprintf( pErr, "usage: order [-rvh] <file>\n" );
    fprintf( pErr, "\t         computes a good static CI variable order\n" );
    fprintf( pErr, "\t-r     : toggle reverse ordering [default = %s]\n", fReverse? "yes": "no" );  
    fprintf( pErr, "\t-v     : prints verbose information [default = %s]\n", fVerbose? "yes": "no" );  
    fprintf( pErr, "\t-h     : print the command usage\n");
    fprintf( pErr, "\t<file> : (optional) file with the given variable order\n" );  
    return 1;
}