class Program < ActiveRecord::Base

  include ActionView::Helpers::TextHelper
  include ActionController::UrlWriter
  
  has_many :episodes, :order => "published_at DESC"

  validates_presence_of :title
  
  def to_rss(media_type='mp3')
    rss = RSS::Rss.new( "2.0" )
    channel = RSS::Rss::Channel.new
    channel.title = title + (media_type != 'mp3' ? " - #{media_type}" : '')
    channel.description = textilize_without_paragraph(description)
    channel.link = link
    channel.language = language
    #channel.itunes(:author => "Geoffrey Grosenbach")
    rss.channel = channel

    selected_episodes = self.episodes.find( :all, :order => "published_at DESC", 
                                            :conditions => ["has_#{media_type} = ?", true])
    selected_episodes.each do |episode|
      item = RSS::Rss::Channel::Item.new
      item.title = "#{episode.title} - #{self.title}"
      if media_type == 'transcript'
        if episode.transcript_url.blank?
          item.link = episode_url(episode.program, episode.to_param)
        else
          # HACK Find better way to generate non-rails url
          item.link = "http://" + ActionController::UrlWriter.default_url_options[:host] + "/transcripts/" + episode.send("#{media_type}_url")
        end
      else
        item.link = episode.send("#{media_type}_url")
      end
      #item.guid
      item.pubDate = episode.published_at
      item.description = textilize(episode.description)
      if ['mp3', 'mp4'].include?(media_type)
        item.enclosure = RSS::Rss::Channel::Item::Enclosure.new(item.link, episode.send("#{media_type}_length"), 'audio/mpeg')
      end
      channel.items << item
    end

    return rss.to_s
  end
  
end