# Copyright (c) 2020 Contrast Security, Inc. See https://www.contrastsecurity.com/enduser-terms-0317a for more details.
# frozen_string_literal: true

require 'contrast/utils/string_utils'

module Contrast
  module Api
    module Decorators
      # Used to decorate the {Contrast::Api::Dtm::Message} protobuf model so it
      # can handle instance data massaging.
      module Message
        include Contrast::Components::Interface
        access_component :app_context, :logging

        def self.included klass
          klass.extend(ClassMethods)
        end

        def append_event event
          case event
          when Contrast::Api::Dtm::ServerActivity
            self.server_activity = event
          when Contrast::Api::Dtm::AgentStartup
            self.agent_startup = event
          when Contrast::Api::Dtm::ApplicationCreate
            self.application_create = event
          when Contrast::Api::Dtm::ApplicationUpdate
            self.application_update = event
          when Contrast::Api::Dtm::Activity
            self.activity = event
          when Contrast::Api::Dtm::HttpRequest
            self.prefilter = event
          when Contrast::Api::Dtm::HttpResponse
            self.postfilter = event
          when Contrast::Api::Dtm::Poll
            self.poll = event
          when Contrast::Api::Dtm::ObservedRoute
            self.observed_route = event
          else
            logger.error('Unknown event type received. Unsure how to send.', event_type: event.cs__class.name)
            return
          end
          logger.debug('Wrapping event in message',
                       msg_id: __id__,
                       p_id: pid,
                       msg_count: message_count,
                       event_id: event.__id__,
                       event_type: event.cs__class.name)
        end

        # Used to add class methods to the ApplicationUpdate class on inclusion of the decorator
        module ClassMethods
          @@message_total = 0 # rubocop:disable Style/ClassVars
          def message_count
            @@message_total += 1 # rubocop:disable Style/ClassVars
          end

          def build event
            msg = new
            msg.app_name      = APP_CONTEXT.name
            msg.app_path      = APP_CONTEXT.path
            msg.app_language  = Contrast::Utils::ObjectShare::RUBY
            msg.client_id     = APP_CONTEXT.client_id
            msg.message_count = message_count
            msg.pid           = APP_CONTEXT.pid
            msg.ppid          = APP_CONTEXT.ppid
            msg.append_event(event)
            msg
          end
        end
      end
    end
  end
end

Contrast::Api::Dtm::Message.include(Contrast::Api::Decorators::Message)