my $diagram_name = '';
my $dia_file = '';
my $label_file = '';
my $component_list_file = '';
my $debug = 0;
my $create_component_list = 0;
my $create_abg = 0;
my $abg_file = '';
GetOptions ('diagram_name=s' => \$diagram_name,
	    'dia_file=s' => \$dia_file,
	    'label_file=s' => \$label_file,
	    'component_list_file=s' => \$component_list_file,
	    'debug' => \$debug,
	    'create_component_list' => \$create_component_list,
	    'create_abg' => \$create_abg,
	    'abg_file=s' => \$abg_file,
	    );

die usage() if $diagram_name eq '';

# Use defaults if necessary:
$dia_file = $diagram_name . "_abg.dia" if ($dia_file eq '');
$label_file = $diagram_name . "_lbl.txt" if ($label_file eq '');
$abg_file = $diagram_name . "_abg.m" if ($abg_file eq '');
$component_list_file = $diagram_name . "_cmp.txt" if ($component_list_file eq '');

# Start Parsing XML, and creating files:
my $dom = new XML::DOM::Parser;
my ($doc);

$doc = $dom->parsefile($dia_file);
$objects = get_objects_node($doc,"Bond Graph");

get_component_data($objects);
get_bond_data($objects);

create_component_list() if ($create_component_list);
if ($create_abg) {
    open (OUT,">$abg_file") ||
	die "Cannot open $abg_file for writing.\n";

    # Don't update the label file unless we are creating component list and abg simultaneously...
    if ($create_component_list) {
	#system("abg2lbl_fig2txt -c $component_list_file $diagram_name") &&
	system("abg2lbl_fig2txt -x $diagram_name") &&
	    die "abg2lbl_fig2txt failed.";
    }

    get_label_data();
    output_abg();
    output_bond_causality();
    parse_aliases();
    print OUT "endfunction\n";
}


#print $doc->toString;

exit 0;

  }
    close(LBL);
}

sub parse_aliases {
    my ($name,@line,$alias);

    print OUT "# Aliases\n";
    print OUT "# A double underscore __ represents a comma\n";

    open (LBL,$label_file) || die "Cannot open label file: $label_file\n";

    while (<LBL>) {
      chomp;
      # Get rid of everything except ALIAS lines:
      next unless (s/^[%\#]ALIAS(.*)$/$1/);
      # Get rid of leading/trailing whitespace:
      s/^\s*(\S.+\S)\s*$/$1/;

      @line = split(/\s+/);
      die "Label file ALIAS entries must have 2 columns!\n" unless
	  @line == 2;

      print OUT "$diagram_name.alias.$line[1] = \"$line[0]\";\n";
  }
    close(LBL);
    print OUT "## Port domain and units\n";
    print OUT "## Explicit variable declarations\n";
}

sub get_objects_node {
    my ( $doc_node, $layer_name )= @_;
    my ($root,$layer_node,$objects);

    $root = get_first_element_subnode($doc_node);

    return 0;
}

sub output_abg_header {
    my ($date);
    $date = `date`; chomp($date);

    print OUT <<"EOF";
function [${diagram_name}] =  ${diagram_name}_abg
# This function is the acausal bond graph representation of $diagram_name
# Generated by dia2abg.pl on $date
# The file is in Octave format

# Subsystems and Ports

EOF
}

sub output_component {
    my ($NM,$type,$cr,$arg,$rep,$stat,$connections) = @_;

	print OUT <<"EOF";
# Component $NM
  $diagram_name.subsystems.$NM.type = "$type";
  $diagram_name.subsystems.$NM.cr = "$cr";
  $diagram_name.subsystems.$NM.arg = "$arg";
  $diagram_name.subsystems.$NM.repetitions = $rep;
  $diagram_name.subsystems.$NM.status = $stat;
  $diagram_name.subsystems.$NM.connections = [$connections];

	}
	$connections = join(" ",@clist);

	output_component($NM,$type,$cr,$arg,$rep,$stat,$connections);
    }
    
    print OUT "# Ordered list of subsystem names\n";
    # order component id's so that entries found in _lbl.txt file are
    # in _lbl file order, and other entries follow.
    my (@id_list);
    @id_list = keys(%component_id_tag);
    @id_list = sort by_label_file @id_list;

    # calculate string length of longest component name (for octave):
    $strlength=0;
    foreach my $compname (@id_list) {
	my $name = id_to_name($compname);
	$strlength = length($name) if length($name) > $strlength;
    };

    my $i=1;
    foreach my $id (@id_list) {
	my $name = id_to_name($id);
	print OUT "  " . $diagram_name . ".subsystemlist($i,:)" . ' = "'
	    . $name . " " x ($strlength - length($name)) . '";' . "\n";
	$i++;
    }
    print OUT "\n";
}

sub output_bond_causality {
    my ($mtt_bond_id,$dia_bond_id,$mtt_causality,%reverse_mtt_bond_id_index);

    print OUT "# Bonds\n";
    print OUT "  $diagram_name.bonds = [\n";

    %reverse_mtt_bond_id_index = reverse(%mtt_bond_id_index);

    while (($mtt_bond_id,$dia_bond_id) = each(%reverse_mtt_bond_id_index)) {




	$mtt_causality =
	    get_sign_of_power($dia_bond_id) * get_sign_of_causality($dia_bond_id);

	print OUT "      $mtt_causality $mtt_causality\n";
    }
    print OUT "      ];\n\n";
}

sub get_component_data {
    my ( $objects_node )= @_;
    my($obj,$id,$attr,$comp,$strattr,$str_elem,$string);

    print_debug("READING COMPONENTS FROM $dia_file...\n");

}

sub print_debug {
    print STDERR $_[0] if ($debug);
}

sub usage {
    return 
	"\n" .
	"Usage: dia2abg.pl --diagram_name <diagram_name> [options]\n" .
	"Options:\n" .
	"\t--dia_file <dia_file>\n" .
	"\t--label_file <label_file>\n" .
	"\t--component_list_file\n" .
	"\t--create_component_list\n" .
	"\t--create_abg\n" .
	"\t--debug\n" .
	"\t--abg_file <abg_file>\n" .
	"\n"
}