module Neoteric
  module NewsPost
    def self.included(base)
      base.table_name = 'news_posts'

      base.pubdraft

      base.send :include, ::Neoteric::Archiver
      base.archive_fields :single => :published_at,
                          :scope  => :published

      base.extend FriendlyId
      base.friendly_id :title, :use => :slugged

      base.acts_as_taggable
      base.attr_accessible :tag_list

      base.send :include, ::Neoteric::Navigator
      base.navigate :scope => :published,
                    :field => :published_at,
                    :order => 'published_at DESC, title'


      base.send :before_save, :trigger_state_transition_callbacks

      base.attr_accessible :body, :excerpt, :published_at, :title

      base.send :default_scope, :order => ['published_at DESC', :title]

      base.scope :published, lambda { base.where("published_at <= ? \
                                                  AND state = 'published'",
                                                 Date.today) }
      base.scope :future, lambda { base.where("published_at > ?", Date.today) }
    end

    private
    def date_and_title
      [published_at.to_s, title].join(' ')
    end

    def set_published_at
      self.published_at = Date.today if published_at.blank?
    end

    def clear_published_at
      self.published_at = nil
    end

    def trigger_state_transition_callbacks
      case self.state
      when 'published'
        set_published_at
      else
        clear_published_at
      end
    end
  end
end