module HomePage
  module Navigation
    class Base
      @@items = [:users, :authentication]
      @@products = {}
      @@menu_options = {}
      
      def self.items
        @@items
      end
      
      def self.items=(value)
        @@items = value
      end
      
      def self.add_product(slug, text)
        @@products[slug] = text
      end
      
      def self.products
        @@products
      end
      
      def self.add_menu_option(resource, option, value)
        @@menu_options[resource] ||= {}
        @@menu_options[resource][option] = value
      end
      
      def self.menu_options(resource)
        @@menu_options[resource] ||= {}
        @@menu_options[resource]
      end
    end
    
    def self.code
      Proc.new do |navigation|
        navigation.items do |primary, options|
          primary.dom_class = 'nav navbar-nav'
          
          ::HomePage::Navigation::Base.items.each do |item|
            klass = "HomePage#{item.is_a?(Array) ? item.first.to_s.classify : ''}::Navigation"
            item = item.is_a?(Array) ? item.last : item
            instance_exec primary, HomePage::Navigation::Base.menu_options(item), &klass.constantize.menu_code(item)
          end
        end
      end
    end
    
    def self.menu_code(resource)
      case resource
      when :users
        Proc.new do |primary, options|
          if user_signed_in?
            primary.item :users, I18n.t('users.index.title'), users_path do |users|
              unless (@user.new_record? rescue true) || current_user.try(:id) == @user.id
                if options[:after_resource_has_many]
                  instance_exec users, {}, &options[:after_resource_has_many]
                end
              end
            end
          end
        end
      when :authentication
        Proc.new do |primary, options|
          if user_signed_in?
            primary.item :sign_out, I18n.t('authentication.sign_out'), destroy_user_session_path, method: :delete
          else
            primary.item :authentication, I18n.t('authentication.title'), new_user_session_path do |authentication|
              authentication.item :sign_in, I18n.t('authentication.sign_in'), new_user_session_path
              authentication.item :sign_up, I18n.t('authentication.sign_up'), new_user_registration_path
            end
          end
        end
      end
    end
  end
end