require_relative 'link'

module CCS
  module Components
    module CCS
      class Header < Base
        # = CCS Header navigation
        #
        # The header navigation section
        #
        # @!attribute [r] primary_links
        #   @return [Array<Link>] An array of the initialised primary navigation links
        # @!attribute [r] secondary_links
        #   @return [Array<Link>] An array of the initialised secondary navigation links
        # @!attribute [r] navigation_label
        #   @return [String] The aria label for the navigation
        # @!attribute [r] navigation_classes
        #   @return [String] The classes for the navigation
        # @!attribute [r] menu_button
        #   @return [Hash] The options for the menu button

        class Navigation
          include ActionView::Context
          include ActionView::Helpers

          private

          attr_reader :primary_links, :secondary_links, :navigation_label, :navigation_classes, :menu_button

          public

          # rubocop:disable Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity

          # @param navigation [Hash] options for the navigation
          # @param menu_button [Hash] options for the menu button
          # @param context [ActionView::Base] the view context
          #
          # @option navigation [Array] :primary_items an array of primary links for the navigation section.
          #                            See {Components::CCS::Header::Link#initialize Link#initialize} for details of the items in the array.
          # @option navigation [Array] :secondary_items an array of secondary links for the navigation section.
          #                            See {Components::CCS::Header::Link#initialize Link#initialize} for details of the items in the array.
          # @option navigation [String] :classes additional CSS classes for the navigation HTML
          # @option navigation [String] :label text for the aria-label attribute of the navigation. Defaults to the menu button text
          #
          # @option menu_button [String] :text text for the button that opens the mobile navigation menu.
          #                                    By default, this is set to +Menu+.
          # @option menu_button [String] :label text for the aria-label attribute of the button that opens the mobile navigation.
          #                                     Defaults to +Show or hide menu+.

          def initialize(navigation:, serivce_name_present:, context:, menu_button: nil)
            menu_button ||= {}
            menu_button[:text] ||= 'Menu'
            menu_button[:label] ||= 'Show or hide menu'

            @menu_button = menu_button
            @primary_links = navigation[:primary_items]&.map { |navigation_link| Link.new(li_class: LI_CLASS, context: context, **navigation_link) }
            @secondary_links = navigation[:secondary_items]&.map { |navigation_link| Link.new(li_class: LI_CLASS, context: context, **navigation_link) }
            @navigation_label = navigation[:label] || menu_button[:text]
            @navigation_classes = 'ccs-header__navigation'
            @navigation_classes << ' ccs-header__navigation--no-service-name' unless serivce_name_present
            @navigation_classes << " #{navigation[:classes]}" if navigation[:classes]
          end

          # rubocop:enable Metrics/CyclomaticComplexity, Metrics/PerceivedComplexity

          # rubocop:disable Metrics/AbcSize

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

          def render
            tag.nav(aria: { label: navigation_label }, class: navigation_classes) do
              concat(button_tag(menu_button[:text], type: :button, class: 'ccs-header__menu-button ccs-js-header-toggle', aria: { controls: 'navigation', label: menu_button[:label] }, hidden: true))
              concat(tag.div(id: 'navigation', class: 'ccs-header__navigation-lists') do
                if secondary_links
                  concat(tag.ul(id: 'navigation-secondary', class: "ccs-header__navigation-secondary-list #{'ccs-header__navigation--no-second-list' unless primary_links}".rstrip) do
                    secondary_links.each { |secondary_link| concat(secondary_link.render) }
                  end)
                end
                if primary_links
                  concat(tag.ul(id: 'navigation-primary', class: "ccs-header__navigation-primary-list #{'ccs-header__navigation--no-second-list' unless secondary_links}".rstrip) do
                    primary_links.each { |primary_link| concat(primary_link.render) }
                  end)
                end
              end)
            end
          end

          # rubocop:enable Metrics/AbcSize

          # The li class for the navigation links

          LI_CLASS = 'ccs-header__navigation-item'.freeze
        end
      end
    end
  end
end