# frozen_string_literal: true

module Html2rss
  module AttributePostProcessors
    module HtmlTransformers
      ##
      # Transformer that wraps <img> tags into <a> tags linking to `img.src`.
      class WrapImgInA
        ##
        # Wraps <img> tags into <a> tags that link to `img.src`.
        #
        # @param node_name [String]
        # @param node [Nokogiri::XML::Node]
        # @return [nil]
        def call(node_name:, node:, **_env)
          return unless already_wrapped?(node_name, node)

          wrap_image_in_anchor(node)
        end

        def already_wrapped?(node_name, node)
          node_name == 'img' && node.parent.name != 'a'
        end

        private

        ##
        # Wraps the <img> node in an <a> tag.
        #
        # @param node [Nokogiri::XML::Node]
        # @return [nil]
        def wrap_image_in_anchor(node)
          anchor = Nokogiri::XML::Node.new('a', node.document)
          anchor['href'] = node['src']
          node.add_next_sibling(anchor)
          anchor.add_child(node.remove)
        end
      end
    end
  end
end