require_relative '../base'
require_relative 'accordion/section'

module CCS::Components
  module GovUK
    # = GOV.UK Accordion
    #
    # This is used for generating the accordion component from the
    # {https://design-system.service.gov.uk/accordion/back-link GDS - Components - Accordion}
    #
    # @!attribute [r] accordion_sections
    #   @return [Array<Section>] An array of the initialised accordion sections

    class Accordion < Base
      private

      attr_reader :accordion_sections

      public

      # @param accordion_id [String] used as an id in the HTML for the accordion as a whole,
      #                              and also as a prefix for the ids of the section contents
      #                              and the buttons that open them
      # @param accordion_sections [Array<Hash>] an array of accordion section attributes.
      #                                         See {Components::GovUK::Accordion::Section#initialize Section#initialize} for details of the items in the array.
      # @param options [Hash] options that will be used in customising the HTML
      #
      # @option options [String] :classes additional CSS classes for the accordion HTML
      # @option options [Integer] :heading_level (2) heading level, from 1 to 6
      # @option options [Hash] :attributes any additional attributes that will added as part of the HTML

      def initialize(accordion_id:, accordion_sections:, **options)
        super(**options)

        @options[:attributes][:id] = accordion_id
        @options[:heading_level] ||= 2

        @accordion_sections = accordion_sections.map.with_index(1) { |accordion_section, index| Section.new(section: accordion_section, accordion_id: accordion_id, index: index, heading_level: @options[:heading_level]) }
      end

      # Generates the HTML for the GOV.UK Accordion component
      #
      # @return [ActiveSupport::SafeBuffer]

      def render
        tag.div(**options[:attributes]) do
          accordion_sections.each { |accordion_section| concat(accordion_section.render) }
        end
      end

      # The default attributes for the accordion

      DEFAULT_ATTRIBUTES = { class: 'govuk-accordion', data: { module: 'govuk-accordion' } }.freeze
    end
  end
end