#!/usr/bin/env perl

use FindBin;
FindBin::again();
our $home;

BEGIN {
  # try really hard to find a localenv if one isn't already in place.
  $home = ($ENV{NETDISCO_HOME} || $ENV{HOME});
  eval "use Daemon::Control";

  if ($@) {
      use File::Spec;
      my $localenv = File::Spec->catfile($FindBin::RealBin, 'localenv');
      exec($localenv, $0, @ARGV) if -f $localenv;
      $localenv = File::Spec->catfile($home, 'perl5', 'bin', 'localenv');
      exec($localenv, $0, @ARGV) if -f $localenv;
      die "Sorry, can't find libs required for App::Netdisco.\n";
  }
}

BEGIN {
  # stuff useful locations into @INC and $PATH
  my $location = $FindBin::RealBin;

  use Path::Class;
  unshift @INC,
    dir($location)->parent->subdir('lib')->stringify,
    dir($location, 'lib')->stringify;

  use Config;
  $ENV{PATH} = $location . $Config{path_sep} . $ENV{PATH};
}

use App::Netdisco;
use Dancer ':script';
use Dancer::Plugin::DBIC 'schema';
info "App::Netdisco version $App::Netdisco::VERSION loaded.";

use 5.010_000;
use Term::UI;
use Term::ReadLine;

use Archive::Extract;
$Archive::Extract::PREFER_BIN = 1;
use HTTP::Tiny;
use Try::Tiny;

=head1 NAME

netdisco-deploy - Database, OUI and MIB deployment for Netdisco

=head1 USAGE

This script deploys the Netdisco database schema, OUI data, and MIBs. Each of
these is an optional service which the user is asked to confirm.

Pre-existing requirements are that there be a database table created and a
user with rights to create tables in that database. Both the table and user
name must match those configured in your environment YAML file (default
C<~/environments/deployment.yml>).

This script will download the latest MAC address vendor prefix data from the
Internet, and update the OUI table in the database. Hence Internet access is
required to run the script.

Similarly the latest Netdisco MIB bundle is also downloaded, placed into the
user's home directory (or C<$ENV{NETDISCO_HOME}>), and Netdisco reconfigured
for its use.

=cut

say 'This is the Netdisco II deployment script.';
say '';
say 'Before we continue, the following prerequisites must be in place:';
say ' * Internet access';
say ' * Database added to PostgreSQL for Netdisco';
say ' * User added to PostgreSQL with rights to the Netdisco Database';
say ' * "~/environments/deployment.yml" file configured with Database dsn/user/pass';
say ' * A full backup of any existing Netdisco database data';
say '';
say 'You will be asked to confirm all changes to your system.';
say '';

my $term = Term::ReadLine->new('netdisco');
my $bool = $term->ask_yn(
  prompt => 'So, is all the above in place?', default => 'n',
);

exit(0) unless $bool;

say '';
$bool = $term->ask_yn(
  prompt => 'Would you like to deploy or upgrade your database schema?', default => 'n',
);
deploy_db() if $bool;

say '';
$bool = $term->ask_yn(
  prompt => 'Download and update vendor MAC prefixes (OUI data)?', default => 'n',
);
deploy_oui() if $bool;

say '';
my $default_mibhome = dir($home, 'netdisco-mibs');
if (setting('mibhome') and setting('mibhome') ne $default_mibhome) {
  my $mibhome = $term->get_reply(
    print_me => "MIB home options:",
    prompt   => "Download and update MIB files to...?",
    choices  => [setting('mibhome'), $default_mibhome, 'Skip this.'],
    default  => 'Skip this.',
  );
  deploy_mibs($mibhome) if $mibhome and $mibhome ne 'Skip this.';
}
else {
  $bool = $term->ask_yn(
    prompt => "Download and update MIB files?", default => 'n',
  );
  deploy_mibs($default_mibhome) if $bool;
}

sub deploy_db {
  system 'netdisco-db-deploy';
  say 'DB schema update complete.';
}

sub deploy_oui {
  my $schema = schema('netdisco');
  $schema->storage->disconnect;

  my $url = 'http://standards.ieee.org/develop/regauth/oui/oui.txt';
  my $resp = HTTP::Tiny->new->get($url);
  my %data = ();

  if ($resp->{success}) {
      foreach my $line (split /\n/, $resp->{content}) {
          if ($line =~ m/^\s*(.{2}-.{2}-.{2})\s+\(hex\)\s+(.*)\s*$/i) {
              my ($oui, $company) = ($1, $2);
              $oui =~ s/-/:/g;
              $data{lc($oui)} = $company;
          }
      }

      if ((scalar keys %data) > 15_000) {
          $schema->txn_do(sub{
            $schema->resultset('Oui')->delete;
            $schema->resultset('Oui')->populate([
              map {{oui => $_, company => $data{$_}}} keys %data
            ]);
          });
      }
  }

  say 'OUI update complete.';
}

sub deploy_mibs {
  my $mibhome = dir(shift);

  my $url = 'http://downloads.sourceforge.net/project/netdisco/netdisco-mibs/latest-snapshot/netdisco-mibs-snapshot.tar.gz';
  my $file = file($home, 'netdisco-mibs-snapshot.tar.gz');
  my $resp = HTTP::Tiny->new->mirror($url, $file);

  if ($resp->{success}) {
      my $ae = Archive::Extract->new(archive => $file, type => 'tgz');
      $ae->extract(to => $mibhome->parent->stringify);
      unlink $file;
  }

  say 'MIBs update complete.';
}

exit 0;