#!/usr/bin/env perl

use strict;
use warnings;

our $home;

BEGIN {
  use FindBin;
  FindBin::again();

  $home = ($ENV{NETDISCO_HOME} || $ENV{HOME});

  # try to find a localenv if one isn't already in place.
  if (!exists $ENV{PERL_LOCAL_LIB_ROOT}) {
      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"
        if !exists $ENV{PERLBREW_PERL};
  }
}

BEGIN {
  use Path::Class;

  # stuff useful locations into @INC and $PATH
  unshift @INC,
    dir($FindBin::RealBin)->parent->subdir('lib')->stringify,
    dir($FindBin::RealBin, 'lib')->stringify;
}

use App::Netdisco;
use Dancer ':script';
use Dancer::Plugin::DBIC 'schema';

use App::Netdisco::Util::Device 'get_device';
use NetAddr::IP::Lite ':lower';
use Try::Tiny;

=head1 NAME

nd-import-topology - Import a Nedisco 1.x Manual Topology File

=head1 USAGE

 ~/bin/localenv nd-import-topology /path/to/netdisco-topology.txt

=head1 DESCRIPTION

This helper script will read and import the content of a Netdisco 1.x format
Manual Topology file into the Netdisco 2.x database's C<topology> table.

It's safe to run the script multiple times on the same file - any new data
will be imported.

The file syntax must be like so:

 left-device
   link:left-port,right-device,right-port

The devices can be either host names or IPs. Data will be imported even if the
devices are currently unknown to Netdisco.

=cut

my $file = $ARGV[0];
die "missing topology file name on command line\n" unless $file;

chomp $file;
my $dev = undef; # current device
print "Loading topology information from $file\n";

open (DEVS,'<', $file)
  or die "topo_load_file($file): $!\n";

while (my $line = <DEVS>) {
    chomp $line;
    $line =~ s/(?<!\\)#.*//;
    $line =~ s/\\#/#/g;
    $line =~ s/^\s+//g;
    $line =~ s/\s+$//g;
    next if $line =~ m/^\s*$/;
    
    if ($line =~ m/^link:(.*)/){
        my ($from_port, $to, $to_port) = split(m/,/, $1);

        unless (defined $dev) {
            print " Skipping $line. No device yet defined!\n";
            next;
        }

        # save Link info
        try {
            schema('netdisco')->txn_do(sub {
              schema('netdisco')->resultset('Topology')->create({
                dev1  => $dev,
                port1 => $from_port,
                dev2  => get_device($to)->ip,
                port2 => $to_port,
              });
            });
        };
    }
    elsif ($line =~ /^alias:(.*)/) {
        # ignore aliases
    }
    else {
        my $ip = NetAddr::IP::Lite->new($line)
          or next;
        next if $ip->addr eq '0.0.0.0';

        $dev = get_device($ip->addr)->ip;
        print " Set device: $dev\n";
    }
}

close (DEVS);