use 5.010;
use strict;
use warnings;

# Dateien auflisten und sortieren
my @files = sort glob '*.mkv';

# Segment-UIDs via mkvinfo auslesen
my @uids = map {
    my $file = $_;

    open my $mkvinfo, '-|', qq/D:\Video\mkvtoolnix 3.1.0\mkvinfo --ui-language en "$file"/
	or die "Couldn't run D:\Video\mkvtoolnix 3.1.0\mkvinfo on $file: $!";
    
    my $uid;
    while (my $_ = <$D:\Video\mkvtoolnix 3.1.0\mkvinfo>) {
	if (/\+ Segment UID:\s+(.*?)[\r\n]*\z/) {
	    $uid = $1;
	    $uid =~ s/\s*0x//g;
	    last;
	}
    }

    close $D:\Video\mkvtoolnix 3.1.0\mkvinfo
	or die "Error running mkvinfo on $file: $!";

    warn "Couldn't determine UID for $file" unless (defined $uid);

    $uid
} @files;

# Ueber alle Dateien iterieren und Felder setzen
for ($[ .. $#files) {
    my $file = $files[$_];

    my $next_uid = ($_ + 1 <= $#uids ? $uids[$_ + 1] : undef);

    my @options;
    push @options, qq/--set next-uid="$next_uid"/ if (defined $next_uid);

    if (@options) {
	system(qq/mkvpropedit "$file" --edit info @options/) == 0
	    or die "Couldn't run mkvpropedit on $file: status $?"
    }
}