module Enrolments
  class Suspend
    attr_reader :enrolment, :responses, :comment, :user_id
    attr_writer :event_service, :suspend_enrolment_presentation_service

    def initialize
      @responses = []
    end

    def call(enrolment, user_id, comment)
      @enrolment = enrolment
      @user_id = user_id
      @comment = comment

      suspend_enrolment_presentations
      if all_enrolment_presentations_suspended?
        suspend_enrolment
        raise_suspended_enrolment_event
        create_enrolment_comment
      end
    end

    private

    attr_reader :response

    def suspend_enrolment_presentations
      enrolment.enrolment_presentations.each do |ep|
        @responses << suspend_enrolment_presentation_service.call(ep)
      end
    end

    def all_enrolment_presentations_suspended?
      @responses.all?{ |r| r[:success] }
    end

    def suspend_enrolment
      enrolment.status = 'Suspended'
      enrolment.save
    end

    def raise_suspended_enrolment_event
      event_service.call(enrolment)
    end

    def create_enrolment_comment
      EnrolmentComment.create(comment: comment, user_id: user_id, enrolment_id: enrolment.id)
    end

    def event_service
      @event_service ||= Events::Outgoing::Enrolments::SuspendedEnrolment.new
    end

    def suspend_enrolment_presentation_service
      @suspend_enrolment_presentation_service ||= Enrolments::EnrolmentPresentations::Suspend.new
    end
  end
end

class Enrolments::SuspendWithoutErrors < Enrolments::Suspend
  def raise_suspended_enrolment_event
    # change the implementation here
  end
end

class Enrolments::Suspend
  ...
  class_attribute :event_service, :suspend_enrolment_presentation_service
  ...
end

class Enrolments::Suspend
  ...
  class_attribute :event_service, :suspend_enrolment_presentation_service

  # create the services used for this class
  self.event_service = proc {|enrollment| ... }
  self.suspend_enrolment_presentation_service = proc {|e| ... }
end

class Enrolments::Suspend
  ...

  def event_service(enrollment)
    ...
  end

  def suspend_enrolment_presentation_service(enrollment)
    ...
  end
end