require_relative '../../base'

module CCS
  module Components
    module GovUK
      class Fieldset < Base
        # = GOV.UK Fieldset Legend
        #
        # The legend for the fieldset
        #
        # @!attribute [r] text
        #   @return [String] Text for the fieldset legend
        # @!attribute [r] is_page_heading
        #   @return [Boolean] Flag to indicate of the legend is a the page heading
        # @!attribute [r] caption
        #   @return [Hash] The class for the li elements

        class Legend < Base
          private

          attr_reader :text, :is_page_heading, :caption

          public

          # @param text [String] the text for the fieldset legend
          # @param is_page_heading [Boolean]  if the legend is also the heading it will rendered in a h1
          # @param caption [String] options for the caption to be rendered above the heading if +:is_page_heading+ is true
          # @param options [Hash] options that will be used in customising the HTML
          #
          # @option options [String] :classes additional CSS classes for the legend HTML
          #
          # @option caption [String] :text text for the caption
          # @option caption [String] :classes additional CSS classes for the caption HTML

          def initialize(text:, is_page_heading: nil, caption: nil, **options)
            super(**options)

            @text = text
            @is_page_heading = is_page_heading
            @caption = caption
          end

          # Generates the HTML for the GOV.UK Fieldset legend
          #
          # @return [ActiveSupport::SafeBuffer]

          def render
            tag.legend(class: options[:attributes][:class]) do
              if is_page_heading
                concat(tag.span(caption[:text], class: caption[:classes])) if caption
                concat(tag.h1(text, class: 'govuk-fieldset__heading'))
              else
                text
              end
            end
          end

          # The default attributes for the fieldset legend

          DEFAULT_ATTRIBUTES = { class: 'govuk-fieldset__legend' }.freeze
        end
      end
    end
  end
end