module ActionView #:nodoc:
  module Helpers #:nodoc:
    module UrlHelper #:nodoc:
      private
        def convert_options_to_javascript!(html_options)
          confirm, popup = html_options.delete("confirm"), html_options.delete("popup")

          # post is deprecated, but if its specified and method is not, assume that method = :post
          method, post   = html_options.delete("method"), html_options.delete("post")
          if !method && post
            ActiveSupport::Deprecation.warn(
              "Passing :post as a link modifier is deprecated. " +
              "Use :method => \"post\" instead. :post will be removed in Rails 2.0."
            )
            method = :post
          end
          
          rest_url = html_options.delete("rest_url")
        
          html_options["onclick"] = case
            when popup && method
              raise ActionView::ActionViewError, "You can't use :popup and :post in the same link"
            when confirm && popup
              "if (#{confirm_javascript_function(confirm)}) { #{popup_javascript_function(popup)} };return false;"
            when confirm && method
              "if (#{confirm_javascript_function(confirm)}) { #{method_javascript_function(method, rest_url)} };return false;"
            when confirm
              "return #{confirm_javascript_function(confirm)};"
            when method
              "#{method_javascript_function(method, rest_url)}return false;"
            when popup
              popup_javascript_function(popup) + 'return false;'
            else
              html_options["onclick"]
          end
        end
        
        def method_javascript_function(method, url = nil)
          submit_function = 
            "var f = document.createElement('form'); f.style.display = 'none'; " +
            "this.parentNode.appendChild(f); f.method = 'POST'; f.action = #{url.nil? ? "this.href" : "'#{url}'"};"
          
          unless method == :post
            submit_function << "var m = document.createElement('input'); m.setAttribute('type', 'hidden'); "
            submit_function << "m.setAttribute('name', '_method'); m.setAttribute('value', '#{method}'); f.appendChild(m);"
          end
          
          submit_function << "f.submit();"
        end
    end
  end
end