#!/bin/perl

# NO usage:  du -a /mnt/mp3 |sed 's/^[0-9]*	//g'|sort |du2map > /tmp/all.map
# YES usage:  du -a /mnt/mp3 |sed 's/^[0-9]*	//g'|grep '\.(mp3|ogg)''?$' |du2map /mnt/mp3 > /tmp/rnew.map
# cat /tmp/r.du |sed 's/^[0-9]*	//g'|grep '\.(mp3|ogg)''?$' |du2map > /tmp/rnew.map

$rootdir = $ARGV[0];
shift;
$prefix = $rootdir .'/';

$curlvl=0;
while (<>){
	chomp;
	s/^'(.*)'$/\1/;
	s/''/'/g;
	s/^$prefix//;
	@parts = split('/', $_);
	parts("\t", "", "", 0, @parts);
}
toleft(0);


sub parts {
	my($indent, $path, $fileprefix, $lvl, @parts) = @_;
	if (@parts == 1){
		track($indent, $path, $fileprefix, $lvl, $parts[0]);
	} else {
		work($indent, $path, $fileprefix, $lvl, @parts);
	}
}

sub gettags {
	my($file)= @_;
	my($artist, $title, $album, $track, $year, $comment) = ('','', '', '', '','');
	my($tag) = 'games/mp3tag';
	my($BUFSIZ) = 1024;             # size of chunks we try to read
	my($debug) = 0;
#	$file =~ s/'/''/g;
#	$file = "'".$file."'";
#	$file =~ s/ /\\ /g;
print STDERR "games/mp3tag $file \n";
	pipe(TAG_OUT,WOFD);         # Open pipes that will link child and parent
	if (($cpid = fork()) == 0) {                # in child
		close(TAG_OUT);
		close(STDOUT);                          # attach stdout to pipe
		open(STDOUT,">&WOFD");
		$| = 1;                                      # is this really needed?
		@cmd=($tag, $file);     		# construct tag command line.
		exec $tag @cmd;                       # tag it
		die "exec: $tag: $!\n";               # or die
	}
	# in parent
	close(WOFD);

	# process results.
	while(<TAG_OUT>){
		chomp();
		# print STDERR "\t$_\n";
		if (/^artist: *(.*)/) { $artist = $1};
		if (/^title: *(.*)/) { $title = $1};
		if (/^album: *(.*)/) { $album = $1};
		if (/^track: *(.*)/) { $track = $1};
		if (/^year: *(.*)/) { $year = $1};
		if (/^comment: *(.*)/) { $comment = $1};
	}
	if ($year == 0) {
		$year = '';
	}
	return($artist, $title, $album, $track, $year, $comment);
	
}

sub enc {
	my($s) = @_;
	$s =~ s/ /~/g;
	return $s;
}

sub addencfield {
	my($field, $val, $indent) = @_;
	if ($val ne "") {
		$val =~ s/^[ \t]*//g;
		$val =~ s/[ \t]*$//g;
		$s = enc($val);
		# print STDERR "addencfield($val) -> $s\n";
		print $indent."\t".$field." = ".$s."\n";
	}
}

sub addtext {
	my($val, $indent) = @_;
	if ($val ne "") {
		# print STDERR "addtext($val)\n";
		print $indent."\t".$val."\n";
	}
}

sub track {
	my($indent, $path, $fileprefix, $lvl, $name)= @_;
	my($txt) = $name;
	print STDERR "TRACK lvl=$lvl; curlvl=$curlvl path=$path name=$name\n";
	toleft($lvl);
	my($artist, $title, $album, $track, $year, $comment) = gettags("$rootdir/$path$name");
	print STDERR "($artist)($title)($album)($track)($year)($comment)\n";
	$txt =~ s/\.(mp3|ogg)$//;
	print $indent."track {"."\n";
	addencfield("artist", $artist, $indent);
	addencfield("title", $title, $indent);
	addencfield("album", $album, $indent);
	addencfield("tracknr", $track, $indent);
	addencfield("year", $year, $indent);
	print $indent."\t"."$txt"."\n";
	addtext($comment, $indent);
	print $indent."\t"."file {$fileprefix$name}"."\n";
	print $indent."}"."\n";
	if ($track ne "") {
		$has_tracknr = 1;
	}

}

sub work {
	my($indent, $path, $fileprefix, $lvl, @parts)= @_;
	my($part)= shift(@parts);
	# avoid having a separate 'work level' for directory named mp3
	if ($part eq 'mp3') {
		parts($indent, $path.$part.'/', $fileprefix.$part.'/', $lvl, @parts);
	} else {
		if ($val{$lvl} ne $part) {
			if ($has_tracknr){
				print $indent."\t"."key {tracknr}"."\n";
			}
			toleft($lvl);
			toright($indent, $path, $lvl, $part);
			$val{$lvl} = $part;
		}
		parts($indent."\t", $path.$part.'/', $fileprefix, $lvl+1, @parts);
	}
}

sub toleft {
	my($lvl) = @_;
	# print STDERR "toleft in lvl=$lvl; curlvl=$curlvl\n";
	while($curlvl > $lvl){
		$curlvl--;
print STDERR "toleft backdent lvl=$lvl; curlvl=$curlvl\n";
		print $indent{$curlvl}."}"."\n";
		undef $indent{$curlvl};
	}
	if ($lvl >$curlvl) {
		$curlvl = $lvl;
	}
	# print STDERR "toleft out lvl=$lvl; curlvl=$curlvl\n";
}

sub toright {
	my($indent, $path, $lvl, $name)= @_;
	print $indent."work {"."\n";
	print $indent."\t"."$name"."\n";
	print $indent."\t"."path {$name}"."\n";
	print $indent."\t"."command {sort}"."\n";
print STDERR "toright todent lvl=$lvl; curlvl=$curlvl\n";
	$indent{$lvl} = $indent;
	$curlvl = $lvl;
	$has_tracknr = 0;
}

# some support routines for the select code.
sub addBits {
    local($fd) = @_;
    vec($fileDescs, $fd, 1) = 1;
    $fds{$fd} = 1;
}
sub delBits {
    local($fd) = @_;
    vec($fileDescs, $fd, 1) = 0;
    delete $fds{$fd};
}
sub allEofBits {
    ! keys %fds;
}
sub printVec {
    local($v) = @_;
    local($i, $result);

    for ($i = (8*length($v)) - 1; $i >= 0; $i--) {
        $result .= (vec($v, $i, 1)) ? "1" : "0";
    }
    $result;
}