module SimpleForm
  module Inputs
    class CollectionRadioButtonsInput < CollectionInput
      def input
        label_method, value_method = detect_collection_methods

        @builder.send("collection_#{input_type}",
          attribute_name, collection, value_method, label_method,
          input_options, input_html_options, &collection_block_for_nested_boolean_style
        )
      end

      def input_options
        options = super
        apply_default_collection_options!(options)
        apply_nested_boolean_collection_options!(options) if nested_boolean_style?
        options
      end

      protected

      def apply_default_collection_options!(options)
        options[:item_wrapper_tag] ||= options.fetch(:item_wrapper_tag, SimpleForm.item_wrapper_tag)
        options[:item_wrapper_class] = [
          item_wrapper_class, options[:item_wrapper_class], SimpleForm.item_wrapper_class
        ].compact.presence

        options[:collection_wrapper_tag] ||= options.fetch(:collection_wrapper_tag, SimpleForm.collection_wrapper_tag)
        options[:collection_wrapper_class] = [
          options[:collection_wrapper_class], SimpleForm.collection_wrapper_class
        ].compact.presence
      end

      # Force item wrapper to be a label when using nested boolean, to support
      # configuring classes through :item_wrapper_class, and to maintain
      # compatibility with :inline style and default :item_wrapper_tag.
      def apply_nested_boolean_collection_options!(options)
        options[:item_wrapper_tag] = :label
      end

      def collection_block_for_nested_boolean_style
        return unless nested_boolean_style?

        proc { |builder| build_nested_boolean_style_item_tag(builder) }
      end

      def build_nested_boolean_style_item_tag(collection_builder)
        collection_builder.radio_button + collection_builder.text
      end

      def item_wrapper_class
        "radio"
      end

      # Do not attempt to generate label[for] attributes by default, unless an
      # explicit html option is given. This avoids generating labels pointing to
      # non existent fields.
      def generate_label_for_attribute?
        false
      end
    end
  end
end