module Alchemy
  module Admin
    module ContentsHelper

      include Alchemy::Admin::BaseHelper

      # Returns a string for the id attribute of a html element for the given content
      def content_dom_id(content)
        return "" if content.nil?
        if content.class == String
          c = Content.find_by_name(content)
          return "" if c.nil?
        else
          c = content
        end
        "#{c.essence_type.demodulize.underscore}_#{c.id}"
      end

      # Renders the name of elements content or the default name defined in elements.yml
      def render_content_name(content)
        if content.blank?
          warning('Element is nil')
          return ""
        else
          content_name = content.name_for_label
        end
        if content.description.blank?
          warning("Content #{content.name} is missing its description")
          title = _t(:content_description_missing)
          content_name = %(<span class="warning icon" title="#{title}"></span>&nbsp;#{content_name}).html_safe
        end
        content.has_validations? ? "#{content_name}<span class='validation_indicator'>*</span>".html_safe : content_name
      end

      # Renders a link to show the new content overlay that lets you add additional contents.
      #
      # See +render_create_content_link+ helper for exmaples on how to define additional contents.
      #
      def render_new_content_link(element)
        link_to_overlay_window(
          render_icon(:create) + _t('add new content'),
          alchemy.new_admin_element_content_path(element),
          {
            :size => '310x115',
            :title => _t('Select an content'),
            :overflow => true
          },
          {
            :id => "add_content_for_element_#{element.id}",
            :class => 'button with_icon new_content_link'
          }
        )
      end

      # Renders a link that dynamically adds an additional content into your element editor view.
      #
      # NOTE: You have to define additional contents in your elements.yml file first.
      #
      # ==== Example:
      #
      #   # config/alchemy/elements.yml
      #   - name: downloads:
      #     contents:
      #     - name: file
      #       type: EssenceFile
      #     additional_contents:
      #     - name: file
      #       type: EssenceFile
      #
      # Then add this helper into the elements editor view partial:
      #
      #   <%= render_create_content_link(element, 'file') %>
      #
      # Optionally you can pass a label:
      #
      #   <%= render_create_content_link(element, 'file', :label => 'Add a file') %>
      #
      def render_create_content_link(element, content_name, options = {}, options_for_content = {})
        defaults = {
          :label => _t('Add %{name}', :name => _t(content_name, :scope => :content_names))
        }
        options = defaults.merge(options)
        link_to(render_icon(:create) + options[:label], alchemy.admin_contents_path(
            :content => {
              :name => content_name,
              :element_id => element.id
            },
            :options => options_for_content.to_json
          ),
          :method => :post,
          :remote => true,
          :id => "add_content_for_element_#{element.id}",
          :class => 'button with_icon new_content_link'
        )
      end

      # Renders a link for removing that content
      def delete_content_link(content)
        link_to_confirmation_window(
          render_icon('delete-small'),
          _t('Do you really want to delete this content?'),
          alchemy.admin_content_path(content),
          :class => 'icon_button small',
          :title => _t('Remove this content')
        ) if content.settings[:deletable]
      end

      # Renders the label and a remove link for a content.
      def label_and_remove_link(content)
        content_tag :label do
          [render_hint_for(content), render_content_name(content), delete_content_link(content)].compact.join('&nbsp;').html_safe
        end
      end

    end
  end
end