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#!/usr/bin/env perl
# $Id$
# Copyright 2011 Norbert Preining
# This file is licensed under the GNU General Public License version 2
# or any later version.
#
# Write parsable list of active CTAN mirrors; run from tl-update-auto cron.
# Needed input:
# http://ctan.org/mirrors (CTAN.sites, README.mirrors)
# rsync://comedy.dante.de/MirMon/mirmon.state

use strict;
$^W = 1;
use Data::Dumper;

exit (&main ());

sub main {
  if (@ARGV != 2) {
    die "Usage: $0 CTAN_SITES MIRMON_STATE.\n";
  }

  my %good_urls = read_mstate($ARGV[1]);
  my %ctan_sites = read_readme_mirror($ARGV[0], \%good_urls);
  $Data::Dumper::Indent = 1;
  $Data::Dumper::Sortkeys = 1;  # stable output
  print Data::Dumper->Dump([\%ctan_sites], [qw(mirrors)]);
  
  return 0;
}

# 
# Return hash of good and bad urls from mirmon state data.
#
sub read_mstate {
  my ($mstate) = @_;
  my %good_urls;

  open (MSTATE, "<$mstate") || die "$0: open($mstate) failed: $!\n";
  while (<MSTATE>) {
    my ($m, $age, $status_last_probe, $time_last_succesful_probe,
      $probe_history, $state_history, $last_probe)
      = split (' ');
    if ($status_last_probe eq "ok") {
      $good_urls{$m} = 1;
    } else {
      $good_urls{$m} = 0;
    }
  }
  close(MSTATE);
  
  die "no good urls found in ctan mirmon: $mstate" if keys %good_urls == 0;
  return %good_urls;
}

# 
# return hash of CTAN.sites info.
# 
sub read_readme_mirror {
  my ($ctan_sites,$good_urls_ref) = @_;
  my %mirrors;
  my ($continent, $country, $mirror, %protocols);

  open (CTAN_SITES,"<$ctan_sites") || die "$0: open($ctan_sites) failed: $!\n";
  while (<CTAN_SITES>) {
    chomp;
     if (m/^ (Africa|Asia|Oceania|Europe|North America|South America)/) {
      my $save_continent = $1;
      #warn "got continent $save_continent\n";
      if (defined($mirror)) {
        for my $p (keys %protocols) {
	  add_mirror(\%mirrors,$continent,$country,$mirror,$p,$protocols{$p},
	             $good_urls_ref);
        }
      }
      $continent = $save_continent;
      $mirror = undef;
      $country = undef;
      %protocols = ();
      next;
    }
    next if ! defined $continent;

    if (m/^  ([-a-zA-Z0-9.]+) \((.*)\)\s*$/) {
      my $save_mirror = $1;
      my $save_country = $2;
      # make country names more reasonable
      $save_country =~ s/^The //;
      if (defined($mirror)) {
        for my $p (keys %protocols) {
	  add_mirror(\%mirrors,$continent,$country,$mirror,$p,$protocols{$p},
	             $good_urls_ref);
        }
      }
      $mirror = $save_mirror;
      $country = $save_country;
      %protocols = ();
      next;
    }
    next if ! defined($mirror);

    if (m!^   URL: (ftp|http|rsync)://([-a-zA-Z0-9.]+)/([-\w/]*)!) {
      $protocols{$1} = "$2/$3";
      next;
    }
    #warn "ignored >>$_<<\n";
  }

  die "no ctan mirrors found in $ctan_sites" if keys %mirrors == 0;
  return %mirrors;
}


sub add_mirror {
  my ($mirref,$continent,$country,$mirror,$p,$ppath,$good_urls_ref) = @_;
  my $url = "$p://$ppath";
  if (exists $good_urls_ref->{$url}) {
    if ($good_urls_ref->{$url}) {
      #$mirref->{$continent}{$country}{$mirror}{'protocols_path'}{$p} = $ppath;
      $mirref->{$continent}{$country}{$url} = 1;
    } else {
      printf STDERR "$0: mirror seems to be dead, skipped: $url\n";
    }
  } else {
    # CTAN people leave out ftp/rsync, and intentionally let the
    # CTAN.sites file stay unchanged even when something is removed from
    # mirmon, on occasion.  So don't complain about it.
    #printf STDERR "$0: mirror not in mirmon file, skipped: $url\n";
  }
}