package Perlanet::Trait::YAMLConfig;

use strict;
use warnings;

use Moose::Role;
use namespace::autoclean;

=head1 NAME

Perlanet::Trait::YAMLConfig - configure Perlanet through a YAML configuration
file

=head1 SYNOPSIS

   package MyPerlanet;
   extends 'Perlanet';
   with 'Perlanet::Traits::YAMLConfig';

   my $perlanet = MyPerlanet->new_with_config(
     configfile => 'whatever.yml'
   );

   $perlanet->run;

=head1 DESCRIPTION

Allows you to move the configuration of Perlanet to an external YAML
configuration file.

=head2 Example Configuration File

  title: planet test
  description: A Test Planet
  url: http://planet.example.com/
  author:
    name: Dave Cross
    email: dave@dave.org.uk
  entries: 20
  opml: opml.xml
  page:
    file: index.html
    template: index.tt
  feed:
    file: atom.xml
    format: Atom
  cache_dir: /tmp/feeds
  feeds:
    - url: http://blog.dave.org.uk/atom.xml
      title: Dave's Blog
      web: http://blog.dave.org.uk/
    - url: http://use.perl.org/~davorg/journal/rss
      title: Dave's use.perl Journal
      web: http://use.perl.org/~davorg/journal/
    - url: http://www.oreillynet.com/pub/feed/31?au=2607
      title: Dave on O'Reillynet
      web: http://www.oreillynet.com/pub/au/2607

=head1 METHODS

=head2 THIRTY_DAYS

The default length of caching, if caching options are present in the
configuration

=head2 get_config_from_file

Extracts the configuration from a YAML file

=cut

with 'MooseX::ConfigFromFile';

use Carp qw( carp croak );
use YAML qw( LoadFile );

use constant THIRTY_DAYS => 30 * 24 * 60 * 60;

sub get_config_from_file {
  my ($self, $file) = @_;

  open my $cfg_file, '<:utf8', $file
    or croak "Cannot open file $file: $!";

  my $cfg = LoadFile($cfg_file);

  $cfg->{feeds} = [ map {
    Perlanet::Feed->new($_)
  } @{ $cfg->{feeds} } ];

  $cfg->{max_entries} = $cfg->{entries}
    if $cfg->{entries};

  if ($cfg->{cache_dir}) {
    eval { require CHI; };

    if ($@) {
      carp "You need to install CHI to enable caching.\n";
      carp "Caching disabled for this run.\n";
      delete $cfg->{cache_dir};
    }
  }

  $cfg->{cache_dir}
    and $cfg->{cache} = CHI->new(
      driver     => 'File',
      root_dir   => delete $cfg->{cache_dir},
      expires_in => THIRTY_DAYS,
    );

  return $cfg;
}

=head1 AUTHOR

Oliver Charles, <oliver.g.charles@googlemail.com>

=head1 COPYRIGHT AND LICENSE

Copyright (c) 2010 by Magnum Solutions Ltd.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself, either Perl version 5.10.0 or,
at your option, any later version of Perl 5 you may have available.

=cut

1;