module Bootstrap2FormBuilder
  class FormBuilder < ActionView::Helpers::FormBuilder
    #Replace form submit input with styled buttons
    def submit(label, *args)
      options = args.extract_options!
      new_class = options[:class] || "btn btn-primary"
      @template.content_tag("div",
        super(label, *(args << options.merge(:class => new_class))), :class => "form-actions")
    end

=begin
Generates form fields that work with Twitter Bootstrap. Automatically marks required things as required and places errors
on matching inputs.
=end
    def self.create_tagged_field(method_name)
      define_method(method_name) do |label, *args|
        options = args.extract_options!

        custom_label = options[:label] || label.to_s.humanize
        label_class = options[:label_class] || "control-label"

        if @object.class.validators_on(label).collect(&:class).include? ActiveModel::Validations::PresenceValidator
          if label_class.nil?
            label_class = "required"
          else
            label_class = label_class + " required"
          end
        end

        control_group_class = "control-group"
        if @object.errors.messages[label]
          control_group_class = control_group_class + " error"
        end

      @template.content_tag("div",
        @template.content_tag("label",
                  custom_label,
                  :for => "#{@object_name}_#{label}",
                  :class => label_class)  +
          @template.content_tag("div",
                    super(label, *(args << options)) +
                        (@template.content_tag("p", options[:help_block], :class => "help-block") if options[:help_block]) +
                        (@template.content_tag("span", options[:help_inline], :class => "help-inline") if options[:help_inline]),
                    :class => "controls"),
                    :class => control_group_class)
      end
    end

    field_helpers.each do |name|
      create_tagged_field(name)
    end
  end
end