module Mks
  module Rate
    class RateChangeRequestService
      def create(params, created_by)
        change_request = RateChangeRequest.new(params)

        unless params[:rates]
          change_request.errors.add(:base, 'Request has no rates')
          return [change_request, false]
        end

        change_request.created_by = created_by
        change_request.status = 'SUBMITTED'
        begin
          RateChangeRequest.transaction do
            change_request.save!
            return [change_request, true]
          end
        rescue => _
          return [change_request, false]
        end
      end


      def approve(request, approver)
        if update_rates(request.rates)
          request.status = 'APPROVED'
          request.approved_by = approver
          return request.save
        end
        false
      end

      def update_rates(rates)
        service_rates = []
        rates.each do |rate|
          rate = rate.symbolize_keys
          service_rate = ServiceRate.find_by(chargeable_service_id: rate[:chargeable_service_id],
                                             equipment_item_id: rate[:equipment_item_id])
          if service_rate
            service_rate.base_rate = rate[:base_rate] || service_rate.base_rate
            service_rate.utilization_rate = rate[:utilization_rate] || service_rate.utilization_rate
          else
            service_rate = ServiceRate.new(rate.except(:chargeable_service_name, :equipment_item_name))
          end
          service_rates << service_rate
        end

        ServiceRate.transaction do
          service_rates.each(&:save!)
        end
        true
      rescue ActiveRecord::RecordInvalid
        false
      end

    end
  end
end