#!/usr/bin/perl
#

use Data::Dumper;
use strict;
use FindBin;
use lib "$FindBin::Bin";
use IO::File;
use Getopt::Long;
use S2::Tokenizer;
use S2::Checker;
use S2::Layer;
use S2::Util;
use S2::OutputConsole;
use S2::BackendPerl;
use S2::BackendHTML;
use S2::Compiler;

my $output;
my $layerid;
my $layertype;

my $opt_untrusted = 0;
my ($opt_core, $opt_layout);
my $outfile;
my $opt_listbuiltin;

exit usage() unless
    GetOptions("output=s" => \$output,
               "layerid=i" => \$layerid,
               "layertype=s" => \$layertype,
               "core=s" => \$opt_core,
               "layout=s" => \$opt_layout,
               "untrusted" => \$opt_untrusted,
               "outfile=s" => \$outfile,
               "listbuiltin" => \$opt_listbuiltin,
               );

exit usage() unless @ARGV == 1;

my $filename = shift @ARGV;

unless ($output || $opt_listbuiltin) {
    print STDERR "No output format specified\n";
    exit 1;
}

if ($output && $opt_listbuiltin) {
    print STDERR "--output and --listbuiltin are mutually exclusive options.\n";
    exit 1;
}

if ($output eq "tokens") {
    my $toker = S2::Tokenizer->new(getFileBody($filename));
    while (my $tok = $toker->getToken()) {
        print $tok->toString(), "\n";
    }
    print "end.\n";
    exit 0;
}


my $ck;
if ($output eq "html" || $output eq "s2") {
    $ck = undef;
} else {
    $ck = new S2::Checker;
}

my $layerMain;

if ($output ne 'html') {
    if (! defined $layertype) {
        die "Unspecified layertype.\n";
    } elsif ($layertype eq "core") {
        # nothing.
    } elsif ($layertype eq "i18nc" || $layertype eq "layout") {
        makeLayer($opt_core, "core", $ck);
    } elsif ($layertype eq "theme" || $layertype eq "i18n" || $layertype eq "user") {
        makeLayer($opt_core, "core", $ck);
        makeLayer($opt_layout, "layout", $ck);
    } else {
        die "Invalid layertype.\n";
    }
}

my $cplr = S2::Compiler->new({ 'checker' => $ck });
my $compiled;

if ($opt_listbuiltin) {
    # User wants a list of declared builtins instead of output code,
    # so we don't need to bother with the code generation phase.
    makeLayer($filename, $layertype, $ck);

    # This is currently pretty nasty, grovelling around inside Checker's
    # internal data structures.
    my $funcs = $ck->{funcAttr};
    
    foreach my $f (keys %$funcs) {
        my $func = $funcs->{$f};
        if ($func->{builtin}) {
            print "$f\n";
        }
    }
    
    exit(0);
}

if ($output eq "perl") {
    die "No layerid specified" unless $layerid;
}

eval { 
    $cplr->compile_source({
	'type' => $layertype,
	'source' => getFileBody($filename),
	'output' => \$compiled,
	'layerid' => $layerid,
	'untrusted' => $opt_untrusted,
	'builtinPackage' => "S2::Builtin",
	'format' => $output,
    });
};
if ($@) {
    die "Compile error: $@\n";
}

if (defined $outfile) {
    open(OUT,'>',$outfile);
    print OUT $compiled;
    close(OUT);
}
else {
    print $compiled;
}

exit 0;

###################### functions

sub getFileBody {
    my $filename = shift;
    my $fh;

    if ($filename eq "-") {
        $fh = new IO::Handle;
        return $fh if $fh->fdopen(fileno(STDIN),"r");
        die "Couldn't open STDIN?\n";
    }
    $fh = new IO::File $filename, "r";
    die "Can't open file: $filename\n" unless $fh;

    my $body = join('', <$fh>);
    return \$body;
}

sub makeLayer {
    my ($filename, $type, $ck) = @_;
    unless ($filename) {
        die "Undefined filename for '$type' layer.\n";
    }
    
    my $toker = S2::Tokenizer->new(getFileBody($filename));
    my $s2l = S2::Layer->new($toker, $type);
    # now check the layer, since it must have parsed fine (otherwise
    # the Layer constructor would have thrown an exception
    $ck->checkLayer($s2l) if $ck;
    return $s2l;
}

sub usage {
    print STDERR <<'USAGE';
Usage: s2compile [opts]* <file>

Options:
   --output <format>     One of: perl, html, s2, tokens
   --layertype <type>    One of: core, i18nc, layout, theme, i18n, user
   --core <filename>     Core S2 file, if layertype after core
   --layout <filename>   Layout S2 file, if compiling layer after layout
   --outfile <filename>  Optional file to write result to instead of stdout
   --listbuiltin         If compile is successful, will produce a list of
                        declared builtin functions instead of code.

Perl output options:
   --layerid <int>       Set layerID for database
   --untrusted           Source is from untrusted user; do safe (slow) prints

Any input file args can be '-' to read from STDIN, ending with ^D
USAGE

   return 1;
}