require_relative '../base'

module CCS
  module Components
    module GovUK
      # = GOV.UK Label
      #
      # This is used to generate the label component from the Government Design Systems
      #
      # @!attribute [r] attribute
      #   @return [String, Symbol] Attribute of the input that requires a label
      # @!attribute [r] text
      #   @return [String] Text for the label
      # @!attribute [r] form
      #   @return [ActionView::Helpers::FormBuilder] Form builder used to create the label

      class Label < Base
        private

        attr_reader :attribute, :text, :form

        public

        # @param attribute [String, Symbol] the attribute of the input that requires a label
        # @param text [String] (nil) the text for the label
        #                            If nil, then a block will be rendered
        # @param form [ActionView::Helpers::FormBuilder] (nil) optional form builder used to create the label
        # @param options [Hash] options that will be used in customising the HTML
        #
        # @option options [String] :classes additional CSS classes for the label HTML
        # @option options [Boolean] :is_page_heading (false) if the label is also the heading it will rendered in a h1
        # @option options [Hash] :attributes ({}) any additional attributes that will added as part of the HTML

        def initialize(attribute:, text: nil, form: nil, **options)
          super(**options)

          @attribute = attribute
          @text = text
          @form = form
        end

        # Generates the HTML for the GOV.UK label component
        #
        # @yield HTML that will be generated for the label
        #
        # @return [ActiveSupport::SafeBuffer]

        def render(&block)
          if options[:is_page_heading]
            tag.h1(class: 'govuk-label-wrapper') do
              label_html(&block)
            end
          else
            label_html(&block)
          end
        end

        # The default attributes for the label

        DEFAULT_ATTRIBUTES = { class: 'govuk-label' }.freeze

        private

        # Generates the HTML for the label.
        # If +:form+ attribute is present, it will be used to generate the label tag
        #
        # @yield HTML that will be used in the label. Ignored if text is passed.
        #
        # @return [ActiveSupport::SafeBuffer]

        def label_html
          if form
            form.label(attribute, **options[:attributes]) do
              text || yield
            end
          else
            label_tag(attribute, **options[:attributes]) do
              text || yield
            end
          end
        end
      end
    end
  end
end