#! /usr/bin/perl -w
#
# This file is part of DisOrder
# Copyright (C) 2006 Richard Kettlewell
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#

use strict;

my %rename = ();
my $bad = 0;

for my $path (@ARGV) {
    local $_ = `ogginfo \Q$path\E`;
    my ($title, $number);
    if(/title=(.*)/) { $title = $1; }
    if(/tracknumber=(\d+)/) { $number = $1; }
    if(!defined $title || !defined $number) {
	print STDERR "ERROR: cannot find details for $path\n";
	++$bad;
	next;
    }
    $rename{$path} = sprintf("%02d:%s.ogg", $number, $title);
}
exit 1 if $bad;

while(scalar %rename) {
    my $worked = 0;
    while(my ($f, $t) = each %rename) {
	if($f eq $t) {
	    delete $rename{$f};
	    $worked = 1;
	} elsif(link($f, $t)) {
	    unlink($f);
	    delete $rename{$f};
	    print "$f -> $t\n";
	    $worked = 1;
	} else {
	    print "deferring $f -> $t\n";
	}
    }
    die "stuck in a loop!\n" if !$worked;
}