module Ixtlan

  class UserLogger

    AUDIT = Ixtlan::Models::AUDIT.nil? ? nil : Object.full_const_get(Ixtlan::Models::AUDIT)

    def initialize(arg)
      @logger = Slf4r::LoggerFacade.new(arg)
    end

    private

    def login_from(controller)
      user = controller.respond_to?(:current_user) ? controller.send(:current_user) : nil
      user.nil? ? nil: user.login
    end

    public

    def log(controller, message = nil, &block)
      log_user(login_from(controller), message, &block)
    end

    def log_action(controller, message = nil)
      log_user(login_from(controller)) do
        as_xml = controller.response.content_type == 'application/xml' ? " - xml" : ""
        if controller.params[:controller]
          audits = controller.instance_variable_get("@#{controller.params[:controller].to_sym}")
          if(audits)
            "#{controller.params[:controller]}##{controller.params[:action]} #{audits.model.to_s.plural}[#{audits.size}]#{as_xml}#{message}"
          else
            audit = controller.instance_variable_get("@#{controller.params[:controller].singular.to_sym}")
            if(audit)
              errors = if(audit.respond_to?(:errors) && !audit.errors.empty?)
                         " - errors: " + audit.errors.full_messages.join(", ")
                       end
              audit_log = audit.respond_to?(:to_log) ? audit.to_log : "#{audit.model}(#{audit.key})"
              "#{controller.params[:controller]}##{controller.params[:action]} #{audit_log}#{as_xml}#{message}#{errors}"
            else
              "#{controller.params[:controller]}##{controller.params[:action]}#{as_xml}#{message}"
            end
          end
        else
          "params=#{controller.params.inspect}#{message}"
        end
      end
    end

    def log_user(user, message = nil, &block)
      user ||= "???"
      msg = "#{message}#{block.call if block}"
      if AUDIT
        AUDIT.new(:date => DateTime.now, :message => msg, :login => user).push
      end
      @logger.info {"[#{user}] #{msg}" }
    end
  end
end