class ModsDisplay::HTML
  attr_reader :title, :body
  def initialize(config, xml, klass)
    @config = config
    @xml = xml
    @klass = klass
  end
  
  def title
    unless mods_field(@xml, :title).fields.empty?
      return mods_field(@xml, :title).fields.first.values
    end
    ""
  end
  
  # Need to figure out how to get the 1st title out of the list.
  # Maybe have a separate class that will omit the first tite natively
  # and replace the first key in the the fields list with that.
  def body
    output = "<dl>"
    body_fields = mods_display_fields.dup
    body_fields[0] = :subTitle
    body_fields.each do |field_key|
      unless mods_field(@xml, field_key).to_html.nil?
        output << mods_field(@xml, field_key).to_html
      end
    end
    output << "</dl>"
  end
  
  def to_html
    output = "<dl>"
    mods_display_fields.each do |field_key|
      unless mods_field(@xml, field_key).to_html.nil?
        output << mods_field(@xml, field_key).to_html
      end
    end
    output << "</dl>"
  end
  
  def method_missing(method_name, *args, &block)
    if self.to_s.respond_to?(method_name)
      self.to_html.send(method_name, *args, &block)
    else
      super
    end
  end
  
  private
  
  def mods_field(xml, field_key)
    if xml.respond_to?(mods_display_field_mapping[field_key])
      field = xml.send(mods_display_field_mapping[field_key])
      ModsDisplay.const_get("#{field_key.slice(0,1).upcase}#{field_key.slice(1..-1)}").new(field, field_config(field_key), @klass)
    end
  end
  
  def field_config(field_key)
    begin
      @config.send(field_key_translation[field_key] || field_key)
    rescue
      ModsDisplay::Configuration::Base.new
    end
  end
  
  def mods_display_fields
    [:title, :name, :language, :imprint, :resourceType, :genre, :description, :cartographics, :abstract, :contents, :audience, :note, :contact, :collection, :relatedLocation, :relatedItem, :subject, :identifier, :location]
  end
  
  def mods_display_field_mapping
   {:title           => :title_info,
    :subTitle        => :title_info,
    :name            => :plain_name,
    :resourceType    => :typeOfResource,
    :genre           => :genre,
    :imprint         => :origin_info,
    :language        => :language,
    :description     => :physical_description,
    :cartographics   => :subject,
    :abstract        => :abstract,
    :contents        => :tableOfContents,
    :audience        => :targetAudience,
    :note            => :note,
    :contact         => :note,
    :collection      => :related_item,
    :relatedLocation => :related_item,
    :relatedItem     => :related_item,
    :subject         => :subject,
    :identifier      => :identifier,
    :location        => :location}
  end

  def field_key_translation
    {:subTitle        => :sub_title,
     :resourceType    => :resource_type,
     :relatedLocation => :related_location,
     :relatedItem     => :related_item
    }
  end

end