module Ecom
  module Core
    class CrewContractTransactionService
      def execute(crew_contract_transaction, crew_contract)
        Ecom::Core::CrewContractTransaction.transaction do
          case crew_contract_transaction.transaction_type
          when Ecom::Core::CrewContractTransaction::TXN_UPDATE_CREW_TYPE

            create_new_id_card(crew_contract.crew, crew_contract.to)
            # update crew type
            crew = crew_contract.crew
            crew.update(crew_type_id: crew_contract.crew_type_id)
            crew_contract_transaction.update(status: Ecom::Core::CrewContractTransaction::EXECUTED)

          when Ecom::Core::CrewContractTransaction::TXN_UPDATE_PLACE_OF_WORK

            create_new_id_card(crew_contract.crew, crew_contract.to)
            crew_contract_transaction.update(status: Ecom::Core::CrewContractTransaction::EXECUTED)

          when Ecom::Core::CrewContractTransaction::TXN_UPDATE_WAGE

            crew = crew_contract.crew
            # update wage
            crew.update(wage: crew_contract.wage, wage_in_words: crew_contract.wage_in_words)
            crew_contract_transaction.update(status: Ecom::Core::CrewContractTransaction::EXECUTED)

          when Ecom::Core::CrewContractTransaction::TXN_UPDATE_VALIDITY

            # make crew active
            create_new_id_card(crew_contract.crew, crew_contract.to)
            make_crew_active(crew_contract.crew)
            activate_contract(crew_contract)
            crew_contract_transaction.update(status: Ecom::Core::CrewContractTransaction::EXECUTED)

          when Ecom::Core::CrewContractTransaction::TXN_TERMINATE_CONTRACT

            # make crew inactive
            make_crew_inactive(crew_contract.crew)

            # make ID card and gate pass invalid
            invalidate_id_card(crew_contract.crew)
            invalidate_gate_pass(crew_contract.crew)

            # make the contract void
            deactivate_contract(crew_contract)

            crew_contract_transaction.update(status: Ecom::Core::CrewContractTransaction::EXECUTED)

          end
        end
      end

      def activate_contract(crew_contract)
        crew_contract.update(status: :in_effect)
      end

      def deactivate_contract(crew_contract)
        crew_contract.update(status: :void)
      end

      def make_crew_active(crew)
        return if crew.active

        crew.update(active: true)
      end

      def make_crew_inactive(crew)
        return unless crew.active

        crew.update(active: false)
      end

      # invalidate other Id cards and creates a new ID card
      def create_new_id_card(crew, valid_until)
        issued_on = Time.now

        previous_id_card = Ecom::Core::CrewIdCard.where(crew_id: crew.id).last

        previous_id_card&.update(status: 'Invalid')

        new_id_card = Ecom::Core::CrewIdCard.new(
          crew_id: crew.id,
          issued_on: issued_on,
          valid_until: valid_until,
          status: 'Valid'
        )
        raise StandardError, new_id_card.errors.messages unless new_id_card.save
      end

      def invalidate_id_card(crew)
        current_id_card = Ecom::Core::CrewIdCard.where(crew_id: crew.id).last
        current_id_card.update(status: 'Invalid')
      end

      def invalidate_gate_pass(crew)
        Ecom::Core::SiteCrew.where(crew_id: crew.id).update(status: Ecom::Core::SiteCrew::INACTIVE)
      end
    end
  end
end