module ActiveAdmin::BatchActions::ResourceExtension

def add_batch_action(sym, title, options = {}, &block)
  @batch_actions[sym] = ActiveAdmin::BatchAction.new(sym, title, options, &block)
end

def add_default_batch_actions
  destroy_options = {
    :priority => 100,
    :confirm => proc { I18n.t('active_admin.batch_actions.delete_confirmation', :plural_model => active_admin_config.plural_resource_label.downcase) },
    :if => proc{ controller.action_methods.include?('destroy') && authorized?(ActiveAdmin::Auth::DESTROY, active_admin_config.resource_class) }
  }
  add_batch_action :destroy, proc { I18n.t('active_admin.delete') }, destroy_options do |selected_ids|
    active_admin_config.resource_class.find(selected_ids).each { |r| r.destroy }
    redirect_to active_admin_config.route_collection_path(params),
                :notice => I18n.t("active_admin.batch_actions.succesfully_destroyed",
                                  :count => selected_ids.count,
                                  :model => active_admin_config.resource_label.downcase,
                                  :plural_model => active_admin_config.plural_resource_label(:count => selected_ids.count).downcase)
  end
end

def batch_action_path(params = {})
  [route_collection_path(params), "batch_action"].join("/")
end

def batch_actions
  batch_actions_enabled? ? @batch_actions.values.sort : []
end

def batch_actions=(bool)
  @batch_actions_enabled = bool
end

def batch_actions_enabled?
  # If the resource config has been set, use it. Otherwise
  # return the namespace setting
  @batch_actions_enabled.nil? ? namespace.batch_actions : @batch_actions_enabled
end

def clear_batch_actions!
  @batch_actions = {}
end

def initialize(*)
  super
  @batch_actions = {}
  add_default_batch_actions
end

def remove_batch_action(sym)
  @batch_actions.delete(sym.to_sym)
end