module ExpressTemplates
  module Components
    module Forms
      class Radio < FormComponent
        include OptionSupport

        has_option :options, 'Supplies a list of options for the radio tag'
        has_option :label_wrapper_class, 'Specify a class for labels which wrap each radio option.'
        has_option(
          :label_after,
          "Specify (true of false) if the label should appear after the input (they will be siblings)",
          default: false
        )

        contains -> {
          label_tag(label_name, label_text)
          if option_values_specified?
            generate_options_from_specified_values
          else
            use_options_from_collection_radio_buttons_helper
          end
        }

        def use_options_from_collection_radio_buttons_helper
          collection_radio_buttons(resource_name, field_name.to_sym, collection_from_association,
                                   option_value_method, option_name_method,
                                   input_attributes) do |b|
            b.label(class: "radio") {
              b.radio_button + b.text
            }
          end
        end

        def option_values_specified?
          [Array, Hash].include?(option_collection.class)
        end

        def option_collection
          config[:options]
        end

        def generate_options_from_specified_values
          if !option_collection.kind_of?(Array) &&
              !option_collection.kind_of?(Hash)
            raise ArgumentError, "Radio collection should be Array or Hash: #{option_collection.inspect}"
          end

          option_collection_hash = option_collection
          if option_collection.kind_of?(Array)
            option_collection_hash = option_collection.inject({}) do |hash, val|
              hash[val] = val
              hash
            end
          end

          option_collection_hash.each_pair do |key, value|
            if label_after?
              div(class: "radio-input-container") {
                radio_button(resource_name, field_name.to_sym, key, class: 'radio')
                label({
                  class: config[:label_wrapper_class],
                  for: "#{resource_name}_#{field_name}_#{key}",
                }) {
                  current_arbre_element.add_child value
                }
              }
            else
              label(class: config[:label_wrapper_class]) {
                radio_button(resource_name, field_name.to_sym, key, class: 'radio')
                current_arbre_element.add_child  value
              }
            end
          end
        end

        def collection_from_association
          related_collection or raise "No association collection for: #{resource_name}.#{field_name}"
        end

        protected

        def label_after?
          !!config[:label_after]
        end

      end
    end
  end
end