class Mechanize
  class Form
    # This class contains option an option found within SelectList.  A
    # SelectList can have many Option classes associated with it.  An option
    # can be selected by calling Option#tick, or Option#click.  For example,
    # select the first option in a list:
    #  select_list.first.tick
    class Option
      attr_reader :value, :selected, :text, :select_list

      alias :to_s :value
      alias :selected? :selected

      def initialize(node, select_list)
        @text     = node.inner_text
        @value    = Util.html_unescape(node['value'] || node.inner_text)
        @selected = node.has_attribute? 'selected'
        @select_list = select_list # The select list this option belongs to
      end

      # Select this option
      def select
        unselect_peers
        @selected = true
      end

      # Unselect this option
      def unselect
        @selected = false
      end

      alias :tick   :select
      alias :untick :unselect

      # Toggle the selection value of this option
      def click
        unselect_peers
        @selected = !@selected
      end

      private
      def unselect_peers
        if @select_list.instance_of? SelectList
          @select_list.select_none
        end
      end
    end
  end
end