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

      base.extend ClassMethods

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

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

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


      base.send :before_save, :set_default_status,
                              :trigger_state_transition_callbacks

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

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

      base.scope :published, base.where(:status => 'published')
      base.scope :drafted,   base.where(:status => 'drafted')
    end

    module ClassMethods
      def states_for_select
        [['Drafted', 'drafted'], ['Published', 'published']]
      end
    end

    def publish
      self.status = 'published'
      set_published_at
    end

    def publish!
      publish && save
    end

    def draft
      self.status = 'drafted'
      clear_published_at
    end

    def draft!
      draft && save
    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
      new_status = status.gsub(/ed$/,'').to_sym

      send(new_status)
    end

    def set_default_status
      return unless status.blank?
      self.status = 'drafted'
    end
  end
end