module UnobtrusiveJavascript::EnhancedAjaxHelpers
  def form_remote_tag(options = {})
    options[:form] = true
    options[:html] ||= {}
    options[:unobtrusive] = options[:unobtrusive] || false
    options[:html][:action] = options[:html][:action] || url_for(options[:url])
    options[:html][:id] = options[:html][:id] || "form#{tokenised_id(options[:html][:action])}"
    options[:html][:method] = options[:html][:method] || "post"
    
    if options[:unobtrusive]
      @controller.register_js_behaviour("##{options[:html][:id]}:submit", unobtrusive_remote_function(options))
    else
      options[:html][:onsubmit] = "#{remote_function(options)}; return false;"
    end
    
    tag("form", options[:html], true)
  end
  
  def link_to_remote(name, options = {}, html_options = {})
    html_options[:id] = html_options[:id] || "link_#{tokenised_id(name)}"
    unobtrusive = options.delete(:unobtrusive) { |e| false }
    if unobtrusive
      remote_function = unobtrusive_remote_function(options)
      remote_function << safari_bug_fix
      @controller.register_js_behaviour("##{html_options[:id]}:click", remote_function)
      link_to name, options[:url], html_options
    else
      link_to_function(name, remote_function(options), html_options)
    end
  end
  
  protected
    def unobtrusive_remote_function(options)
      remote_function(options).gsub("serialize(this)", "serialize(element)").gsub("return false;", "") << "; Event.stop(event);"
    end
    
    def tokenised_id(arg)
      arg.gsub("/", "_").gsub("?", "_").gsub("=", "_").gsub(" ", "_").downcase
    end
    
    def safari_bug_fix
      " element.onclick = function() { return false; }"
    end
end