engine/app/helpers/admin/custom_fields_helper.rb

module Admin::CustomFieldsHelper

  def options_for_field_kind
    %w(string text category boolean date file has_one has_many).map do |kind|
      [t("custom_fields.kind.#{kind}"), kind]
    end
  end

  def options_for_order_by(content_type, collection_name)
    options = %w{created_at updated_at _position_in_list}.map do |type|
      [t("admin.content_types.form.order_by.#{type.gsub(/^_/, '')}"), type]
    end
    options + options_for_highlighted_field(content_type, collection_name)
  end

  def options_for_order_direction
    %w(asc desc).map do |direction|
      [t("admin.content_types.form.order_direction.#{direction}"), direction]
    end
  end

  def options_for_highlighted_field(content_type, collection_name)
    custom_fields_collection_name = "ordered_#{collection_name.singularize}_custom_fields".to_sym
    collection = content_type.send(custom_fields_collection_name)
    collection.delete_if { |f| f.label == 'field name' || %w(file has_one has_many).include?(f.kind) }
    collection.map { |field| [field.label, field._name] }
  end

  def options_for_group_by_field(content_type, collection_name)
    custom_fields_collection_name = "ordered_#{collection_name.singularize}_custom_fields".to_sym
    collection = content_type.send(custom_fields_collection_name)
    collection.delete_if { |f| not f.category? }
    collection.map { |field| [field.label, field._name] }
  end

  def options_for_text_formatting
    options = %w(none html).map do |option|
      [t("admin.custom_fields.text_formatting.#{option}"), option]
    end
  end

  def options_for_association_target
    current_site.reload.content_types.collect { |c| [c.name, c.content_klass.to_s] }
  end

  def options_for_reverse_lookups(my_content_type)
    klass_name = my_content_type.content_klass.to_s

    [].tap do |options|
      ContentType.where(:'content_custom_fields.kind' => 'has_one', :'content_custom_fields.target' => klass_name).each do |content_type|
        content_type.content_custom_fields.find_all { |f| f.has_one? && f.target == klass_name }.each do |field|
          options << {
            :klass  => content_type.content_klass.to_s,
            :label  => field.label,
            :name   => field._name
          }
        end
      end
    end
  end

  def filter_options_for_reverse_has_many(contents, reverse_lookup, object)
    # Only display items which don't belong to a different object
    contents.reject do |c|
      owner = c.send(reverse_lookup.to_sym)
      !(owner.nil? || owner == object._id)
    end
  end

  def options_for_has_one(field, value)
    self.options_for_has_one_or_has_many(field) do |groups|
      grouped_options_for_select(groups.collect do |g|
        if g[:items].empty?
          nil
        else
          [g[:name], g[:items].collect { |c| [c._label, c._id] }]
        end
      end.compact, value)
    end
  end

  def options_for_has_many(field, content = nil)
    self.options_for_has_one_or_has_many(field, content)
  end

  def options_for_has_one_or_has_many(field, content = nil, &block)
    content_type = field.target.constantize._parent

    if content_type.groupable?
      grouped_contents = content_type.list_or_group_contents

      grouped_contents.each do |g|
        g[:items] = filter_options_for_reverse_has_many(g[:items], field.reverse_lookup, content)
      end if field.reverse_has_many?

      if block_given?
        block.call(grouped_contents)
      else
        grouped_contents.collect do |g|
          if g[:items].empty?
            nil
          else
            { :name => g[:name], :items => g[:items].collect { |c| [c._label, c._id] } }
          end
        end.compact
      end
    else
      contents = content_type.ordered_contents

      if field.reverse_has_many?
        contents = filter_options_for_reverse_has_many(contents, field.reverse_lookup, content)
      end

      contents.collect { |c| [c._label, c._id] }
    end
  end

  def has_many_data_to_js(field, content)
    options = {
      :taken_ids => content.send(field._alias.to_sym).ids
    }

    if !content.new_record? && field.reverse_has_many?
      url_options =  {
        :breadcrumb_alias => field.reverse_lookup_alias,
        "content[#{field.reverse_lookup_alias}]" => content._id
      }

      options.merge!(
        :new_item   => {
          :label  => t('admin.contents.form.has_many.new_item'),
          :url    => new_admin_content_url(field.target_klass._parent.slug, url_options)
        },
        :edit_item_url => edit_admin_content_url(field.target_klass._parent.slug, 42, url_options)
      )
    end

    collection_to_js(options_for_has_many(field, content), options)
  end

end