#!/usr/bin/perl -w

BEGIN {
  my ($wd) = $0 =~ m-(.*)/- ;
  $wd ||= '.';
  unshift @INC, "$wd/bs_copy";
}

use lib 'bs_copy';
use BSUtil;
use BSRPC ':https';
use BSXML;
use BSHTTP;
use Fcntl qw/:flock/;
use File::Path qw/make_path/;

use strict;

my $nodebug;

while (@ARGV) {
  if ($ARGV[0] eq '--nodebug') {
    $nodebug = 1;
  } elsif ($ARGV[0] eq '--') {
    shift @ARGV;
    last;
  } elsif ($ARGV[0] =~ /^-/) {
    die("unknown option $ARGV[0]\n");
  } else {
    last;
  }
  shift @ARGV;
}

if (@ARGV != 2) {
  my $message = "Usage: $0 url dir

    Example: $0 https://api.opensuse.org/public/build/YaST:Head/openSUSE_Tumbleweed/x86_64 my-mirror\n";
  die($message);
}
my ($url, $dir) = @ARGV;
$url =~ s/\/$//;

unless (-d $dir) {
    make_path($dir);
}

open(my $fh, '>', $dir.'/.lock') or die "failed to open lock file: $!\n";
unless(flock($fh, LOCK_EX|LOCK_NB)) {
    print "$dir is locked, waiting ...\n";
    flock($fh, LOCK_EX) or die "failed to lock: $!\n";
    print "... lock released\n";
}

#print "receiving tree state\n";
my $bvl = BSRPC::rpc("$url/_repository", $BSXML::binaryversionlist, "view=binaryversions", "nometa=1");
my @localbins = grep {/^[0-9a-f]{32}-.+\.rpm$/} ls($dir);
my %localbins = map {$_ => 1} @localbins;
my %remotebins;
for my $bv (@{$bvl->{'binary'} || []}) {
  next unless $bv->{'name'} =~ /\.rpm$/;
  next if $nodebug && $bv->{'name'} =~ /-debug(?:info|source|info-32bit)\.rpm$/;
  $remotebins{"$bv->{'hdrmd5'}-$bv->{'name'}"} = $bv;
}
my @todelete = grep {!$remotebins{$_}} sort keys %localbins;
my @todownload = grep {!$localbins{$_}} sort keys %remotebins;
if (@todelete) {
  print "deleting ".@todelete." old packages\n";
  for my $bin (@todelete) {
    unlink("$dir/$bin") || die("unlink: $!\n");
  }
}
if (@todownload) {
  print "downloading ".@todownload." new packages\n";
  my $todo = @todownload;
  my $did = 0;
  while (@todownload) {
    my @fetch = splice(@todownload, 0, 50);
    my @args;
    for (@fetch) {
      die unless /^[0-9a-f]{32}-(.+)\.rpm$/;
      push @args, "binary=$1";
    }
    my $param = {
      'uri' => "$url/_repository",
      'directory' => $dir,
      'map' => sub {
        my ($param, $name) = @_;
        return undef unless $name =~ /^(.+)-([0-9a-f]{32})$/;
        return "$2-$1.rpm";
      },
      'receiver' => \&BSHTTP::cpio_receiver,
    };
    BSRPC::rpc($param, undef, 'view=cpioheaders', @args);
    $did += @fetch;
    #print "$did/$todo\n";
  }
}
#print "done, we now have ".(keys %remotebins)." packages.\n";