module GovukPublishingComponents
  module Presenters
    class CheckboxesHelper
      include ActionView::Helpers
      include ActionView::Context

      attr_reader :items, :name, :css_classes, :error, :has_conditional, :has_nested, :id, :hint_text

      def initialize(options)
        @items = options[:items] || []
        @name = options[:name]
        @css_classes = %w(gem-c-checkboxes govuk-form-group)
        @css_classes << "govuk-form-group--error" if options[:error]
        @error = true if options[:error]

        # check if any item is set as being conditional
        @has_conditional = options[:items].any? { |item| item.is_a?(Hash) && item[:conditional] }
        @has_nested = options[:items].any? { |item| item.is_a?(Hash) && item[:items] }

        @id = options[:id] || "checkboxes-#{SecureRandom.hex(4)}"
        @heading = options[:heading]
        @is_page_heading = options[:is_page_heading]
        @hint_text = options[:hint_text] || "Select all that apply."
      end

      def fieldset_describedby
        text = %w()
        text << "#{id}-hint" if @hint_text
        text << "#{id}-error" if @error
        text
      end

      def heading_markup
        return unless @heading.present?

        if @is_page_heading
          content_tag(
            :legend,
            class: "govuk-fieldset__legend govuk-fieldset__legend--xl gem-c-title gem-c-title--margin-bottom-5"
          ) do
            content_tag(:h1, @heading, class: "gem-c-title__text")
          end
        else
          content_tag(:legend, @heading, class: "govuk-fieldset__legend govuk-fieldset__legend--m")
        end
      end

      def checkbox_markup(checkbox, index)
        checkbox_id = checkbox[:id] || "#{@id}-#{index}"
        controls = checkbox[:conditional].present? ? "#{checkbox_id}-conditional-#{index || rand(1..100)}" : checkbox[:controls]
        checkbox_name = checkbox[:name].present? ? checkbox[:name] : @name
        checked = true if checkbox[:checked].present?
        data = checkbox[:data_attributes] || {}
        data[:controls] = controls

        markup = capture do
          concat check_box_tag checkbox_name, checkbox[:value], checked, class: "govuk-checkboxes__input", id: checkbox_id, data: data
          concat content_tag(:label, checkbox[:label], for: checkbox_id, class: "govuk-label govuk-checkboxes__label")
          concat content_tag(:span, checkbox[:hint], id: "#{checkbox_id}-item-hint", class: "govuk-hint govuk-checkboxes__hint") if checkbox[:hint]
        end

        content_tag(
          :div,
          class: "gem-c-checkbox govuk-checkboxes__item",
        ) do
          markup
        end
      end
    end
  end
end