class LucyCMS::FormBuilder < ActionView::Helpers::FormBuilder
  
  helpers = field_helpers -
    %w(hidden_field fields_for) +
    %w(select)
    
  helpers.each do |name|
    class_eval %Q^
      def #{name}(field, *args)
        options = args.extract_options!
        args << options
        return super if options.delete(:disable_builder)
        default_field('#{name}', field, options){ super }
      end
    ^
  end
  
  def default_field(type, field, options = {}, &block)
    errors = if object.errors[field].present?
      "<div class='errors'>#{[object.errors[field]].flatten.first}</div>"
    end
    if desc = options.delete(:desc)
      desc = "<div class='desc'>#{desc}</div>"
    end
    %(
      <div class='form_element #{type}_element #{'errors' if errors}'>
        <div class='label'>#{label_for(field, options)}</div>
        <div class='value'>#{yield}</div>
        #{desc}
        #{errors}
      </div>
    ).html_safe
  end
  
  def simple_field(label = nil, content = nil, options = {}, &block)
    content ||= @template.capture(&block) if block_given?
    %(
      <div class='form_element #{options.delete(:class)}'>
        <div class='label'>#{label}</div>
        <div class='value'>#{content}</div>
      </div>
    ).html_safe
  end
  
  def label_for(field, options)
    label = options.delete(:label) || field.to_s.titleize.capitalize_all
    "<label for=\"#{object_name}_#{field}\">#{label}</label>".html_safe
  end
  
  def submit(value, options = {}, &block)
    return super if options.delete(:disable_builder)
    extra_content = @template.capture(&block) if block_given?
    simple_field(nil, "#{super(value, options)} #{extra_content}", :class => 'submit_element')
  end
  
  # -- Tag Field Fields -----------------------------------------------------
  def default_tag_field(tag, options = {})
    label     = options[:label] || tag.label.to_s.titleize
    css_class = options[:css_class] || tag.class.name.underscore.downcase.idify
    
    field_css_class = case tag
      when CmsTag::PageRichText                 then 'rich_text'
      when CmsTag::PageText, CmsTag::FieldText  then 'code'
    end
    
    options[:content_field_method] ||= :text_field_tag
    field = 
      options[:field] || 
      @template.send(options[:content_field_method], 'cms_page[cms_blocks_attributes][][content]', tag.content, :id => nil, :class => field_css_class)
    
    %(
      <div class='form_element #{css_class}'>
        <div class='label'>#{label}</div>
        <div class='value'>
          #{field}
          #{@template.hidden_field_tag('cms_page[cms_blocks_attributes][][label]', tag.label, :id => nil)}
          #{@template.hidden_field_tag('cms_page[cms_blocks_attributes][][id]', tag.record_id, :id => nil) if tag.record_id}
        </div>
      </div>
    ).html_safe
  end
  
  def field_date_time(tag)
    default_tag_field(tag, :content_field_method => :datetime_field_tag)
  end
  
  def field_integer(tag)
    default_tag_field(tag, :content_field_method => :number_field_tag)
  end
  
  def field_string(tag)
    default_tag_field(tag)
  end
  
  def field_text(tag)
    default_tag_field(tag, :content_field_method => :text_area_tag)
  end
  
  def page_date_time(tag)
    default_tag_field(tag, :content_field_method => :datetime_field_tag)
  end
  
  def page_integer(tag)
    default_tag_field(tag, :content_field_method => :number_field_tag)
  end
  
  def page_string(tag)
    default_tag_field(tag)
  end
  
  def page_text(tag)
    default_tag_field(tag, :content_field_method => :text_area_tag)
  end
  
  def page_rich_text(tag)
    default_tag_field(tag, :content_field_method => :text_area_tag)
  end
  
  # Capturing all calls of cms_tag_* type. For those we'll try to render
  # a form element. Everything else can trigger MethodNotFound error.
  def method_missing(method_name, *args)
    if m = method_name.to_s.match(/^cms_tag_(\w+)$/)
      send(m[1], *args) if respond_to?(m[1])
    else
      super
    end
  end
  
end