#! /usr/bin/perl
use strict;
use Getopt::Long;

# options
my @optlist = ("h|help!","v|verbose!","d=s","J=s");
my $result = GetOptions @optlist;
our ($opt_h, $opt_v, $opt_d, $opt_J);

# -h option || check the number of arguments
if ($opt_h || @ARGV != 1 ) {
    usage();
    exit 1;
}

# local variables
my $echo = "/bin/echo";
my $am_file = $ARGV[0];

my %env;
&init();

# -d option
if ($opt_d && (! -d $opt_d)) {
    &error("directory $opt_d does not exist.");
}

# -J option
if ($opt_J) {
    if ($opt_J =~ /(-cp|-classpath)\s+/) {
	&error("can not use $1 in -J option");
    }
    $env{"system_opts"} .= " $opt_J";
}

# main
if (! -e $am_file) {
    &error("file $am_file does not exist.");
}

my $arg;
if ($env{"goal"}) {
    $arg .= $env{"goal"} . " ";
}
$arg .= "[\'$am_file\'";
if ($opt_d) { # check -d option
    $arg .= ", \'$opt_d\'";
}
$arg .= "].";

my $cmd = "$echo \"$arg\" | " . $env{"system"};
if ($env{"system_opts"}) {
    $cmd .= " " . $env{"system_opts"};
}
if ($env{"system_args"}) {
    $cmd .= " " . $env{"system_args"};
}
if (! $opt_v) {# check -v option
    $cmd .= " 2> /dev/null";
}

&message("{START translating $am_file --> Java}");
&message($cmd);
system($cmd) && error("translation fails");
&message("{END translating $am_file --> Java}\n");

exit 0;

# sub
sub usage {
    print "\nUsage: $0 [-options] am_file\n";
    print "\n where options include:\n";
    print "\t-h -help         : print this help message\n";
    print "\t-v -verbose      : enable verbose output\n";
    print "\t-d directory     : set the destination directory for am_file.\n";
    print "\t                 : The destination directory must already exist\n";
    print "\t-J option        : option must be enclosed by '.\n";
    print "\t                 : pass option to the Java Virtual Machine\n";
    print "\t                 : (ex. -J '-Xmx100m -verbose:gc')\n";
    print "\n";
}

sub message {
    my ($x) = @_;
    if ($opt_v) { # check -v option
	print "\% $x\n";
    }
}

sub error {
    my ($x) = @_;
    print "\% ERROR: $x: $0\n";
    exit 1;
}

#sub init {
#    %env = (
#	"goal",        "",
#	"system",      "/Users/banbara/prog/plcafe/PrologCafe095/src/compiler/am2j.sav",
#	"system_opts", "",
#	"system_args", "",
#	);
#    %env = (
#	"goal",        "load('/Users/banbara/prog/plcafe/PrologCafe095/src/compiler/pl2am.ql'), main. ",
#	"system",      "sicstus",
#	"system_opts", "",
#	"system_args", "",
#	);
#    %env = (
#	"goal",        "",
#	"system",      "java",
#	"system_opts", "-cp \$PLCAFEDIR/plcafe.jar:\$CLASSPATH",
#	"system_args", "com.googlecode.prolog_cafe.lang.PrologMain com.googlecode.prolog_cafe.compiler.pl2am:main",
#	);
#}