if ActionView::Helpers::AssetTagHelper.respond_to?('register_javascript_expansion')
  ActionView::Helpers::AssetTagHelper.register_javascript_expansion :date_splicer => ["calendar/calendar.js",
                                                                                      "calendar/lang/calendar-parser-#{I18n.locale}.js",
                                                                                      "calendar/lang/calendar-#{I18n.locale}.js",
                                                                                      "calendar/calendar-parser.js",
                                                                                      "calendar/calendar-setup.js"]
end


## Wrap date_splicer helper in FormBuilder method.
## This allows use in form_for context: <% form_for(@account) do |f| %><%= f.date_splicer :start_date %>
class ActionView::Helpers::FormBuilder
  
  def date_splicer(method_name, options = {}, format = :long, default_to_now = false)    
    @template.date_splicer(@object_name, method_name, objectify_options(options), format, default_to_now)    
  end   

end


## Add date_splicer as a specific kind of helper: FormHelper 
module ActionView::Helpers::FormHelper  
  
  def date_splicer(object_name, method_name, options = {}, format = :long, default_to_now = false)
    ActionView::Helpers::InstanceTag.new(object_name, method_name, self, options.delete(:object)).to_date_splicer(options, format, default_to_now)     
  end  

end


class ActionView::Helpers::InstanceTag
  def to_date_splicer(options, format, default_to_now)

    options = options.stringify_keys
    add_default_name_and_id(options)       

    object = @object
    init_date = object.send(method_name) || (Time.now if default_to_now)   
    js_date = (init_date) ? "date       : new Date(#{init_date.year},(#{init_date.month}-1),#{init_date.day}),\n" : ""
    content = "
      <div class='date_splicer_field'>#{to_input_field_tag("text", options)}<img src='/images/calendar.png' id='#{options['id']}_trigger' class='calendarTrigger' style='cursor: pointer; border: 0px solid red;' title='#{I18n.t('date_splicer.trigger_title')}' /></div>
      <div class='validator formError' id='#{options['id']}_msg'></div>
      <input type='hidden' id='#{options['id']}_1i' name='#{object_name}[#{method_name}(1i)]' value='#{(init_date) ? init_date.year : ""}'/>
      <input type='hidden' id='#{options['id']}_2i' name='#{object_name}[#{method_name}(2i)]' value='#{(init_date) ? init_date.month : ""}'/>
      <input type='hidden' id='#{options['id']}_3i' name='#{object_name}[#{method_name}(3i)]' value='#{(init_date) ? init_date.day : ""}'/>        
      <script type='text/javascript'>
      
        if (typeof Calendar == 'undefined') {
          alert('Calendar is undefined. Are javascript files calendar.js, lang/calendar-en.js, lang/calendar-parser-en.js, calendar-parser.js and calendar-setup.js loaded?');
        }              
               
        calendar_loader[calendar_loader.length] = function() {                      
          Calendar.setup({
            #{js_date}
            inputField  : '#{options['id']}',     // id of the input field          
            ifFormat    : '#{I18n.t("date.formats")[format]}',      // format of the input field
            button      : '#{options['id']}_trigger',  // trigger for the calendar (button ID)
            align       : 'Tl',           // alignment (defaults to 'Bl')
            singleClick : true
          })          
        };                
        document.observe('dom:loaded', load_calendars);       
      </script>"        
  end
end