Noosfero/noosfero

class MailingListPlugin::Mailer < ApplicationMailer
  def reply_email(content)
    @content = content
    @body = parse_relative_references(content)
    environment_settings = Noosfero::Plugin::Settings.new content.environment, MailingListPlugin
    client = MailingListPlugin::Client.new(environment_settings)

    to = client.group_list_email(content.profile)
    from = "#{content.author_name} <#{environment_settings.administrator_email}>"

    headers["Message-ID"] = generate_uuid(content)
    if content.kind_of?(Comment)
      reference = content.reply_of || content.source
      headers["In-Reply-To"] = generate_uuid(reference)
    end

    mail(to: to, from: from, subject: generate_subject(content)) do |format|
      format.html
      format.text
    end
  end

  private

    def generate_uuid(content)
      settings = Noosfero::Plugin::Metadata.new content, MailingListPlugin
      "<#{settings.uuid}>"
    end

    def generate_subject(content)
      prefix = ""
      if content.kind_of?(Comment)
        source = content.source
        prefix += _("Re:") + " "
      else
        source = content
      end

      "#{prefix}[#{source.parent.title}] #{source.title}"
    end

    def parse_relative_references(content)
      doc = Nokogiri::HTML::DocumentFragment.parse(content.to_html)
      elements_map = { img: "src", a: "href", audio: "src", embed: "src", iframe: "src", source: "src", video: "src" }
      top_url = content.profile.top_url

      elements_map.each do |selector, attribute|
        doc.css(selector.to_s).each do |element|
          element[attribute] = URI.join(top_url, element[attribute]).to_s
        end
      end

      doc.to_html
    end
end