module AjaxScaffoldHelper

  def column_value(data_object, column)
    column_value = data_object.send(column.name)
    
    if column_value.instance_of? Time
        column_value = format_time(column_value)
    elsif column_value.instance_of? Date
        column_value = format_date(column_value)
    end
    
    column_value
  end

  def format_time(time)
    time.strftime("%m/%d/%Y %I:%M %p")
  end 
  
  def format_date(date) 
    date.strftime("%m/%d/%Y")
  end 
  
  # Generates a temporary id for creating a new element
  def generate_temporary_id
    (Time.now.to_f*1000).to_i.to_s
  end 
  
  def pagination_ajax_links(paginator, params)
    params = params.merge(:controller => 'widgets', :action => 'list')
    pagination_links_each(paginator, {}) do |n|
      link_to_remote n, 
           { :url => params.merge(:page => n ),
           :update => scaffold_content_id(params) },
           { :href => url_for(params.merge(:page => n )) }
    end 
  end
  
  def column_class(column_name, column_value, sort_column)
    class_name = String.new
    class_name += "empty " if column_empty?(column_value)
    class_name += "sorted " if (!sort_column.nil? && column_name == sort_column)
    class_name
  end
  
  def column_empty?(column_value)
    column_value.nil? || (column_value.empty? rescue false)
  end
  
  def loading_indicator_tag(options)
    "<img src=\"/images/indicator.gif\" style=\"display: none;\" id=\"#{loading_indicator_id(options)}\" alt=\"loading indicator\" class=\"loading-indicator\" />"
  end  
  
  # The following are a bunch of helper methods to produce the common scaffold view id's
  
  def scaffold_content_id(options)
    "#{options[:scaffold_id]}-content"
  end
  
  def scaffold_tbody_id(options)
    "#{options[:scaffold_id]}-tbody"
  end

  def scaffold_messages_id(options)
    "#{options[:scaffold_id]}-messages"
  end 
  
  def empty_message_id(options)
    "#{options[:scaffold_id]}-empty-message"
  end 
  
  def element_row_id(options)
    "#{options[:scaffold_id]}-#{options[:action]}-#{options[:id]}"
  end
  
  def element_cell_id(options)
    "#{options[:scaffold_id]}-#{options[:action]}-#{options[:id]}-cell"
  end
  
  def element_form_id(options)
    "#{options[:scaffold_id]}-#{options[:action]}-#{options[:id]}-form"
  end 

  def loading_indicator_id(options)
    if options[:id].nil?
      "#{options[:scaffold_id]}-#{options[:action]}-loading-indicator"
    else
      "#{options[:scaffold_id]}-#{options[:action]}-#{options[:id]}-loading-indicator"
    end
  end

  def element_messages_id(options)
    "#{options[:scaffold_id]}-#{options[:action]}-#{options[:id]}-messages"
  end 
  
end