TSQL to PL/SQL

I need the convert Tsql trigger to Pl/Sqli could anyone help me?

CREATE TRIGGER Rep2_update   ON  
      CA_VISIT_EVENT_ITEM
   AFTER INSERT
AS
BEGIN
      declare @event_item_id numeric(38,0),
      @visit_id numeric(38,0)
      declare
      @agreement_number varchar(6),
      @master_agreement_number varchar(6),
      @company_number varchar(20)
      select  @event_item_id = EVENT_ITEM_ID, @visit_id = VISIT_ID from inserted
      if @event_item_id = 289
      begin
            select @agreement_number = agreement_number from
            CA_VISIT where VISIT_ID = @visit_id

            select @master_agreement_number = master_agreement_number  from AGREEMENTS
            where AGREEMENT_NUMBER = @agreement_number
            if @master_agreement_number is not null
            begin
                  select  @company_number = company_number from agreements
                  where agreement_number = @master_agreement_number
            end
            else
            begin
                  select  @company_number = company_number from agreements
                  where agreement_number = @agreement_number
            end
                  update CA_VISIT_EVENT_ITEM
                  set CHAR_VALUE= @company_number
                  where VISIT_ID =@visit_id and EVENT_ITEM_ID = 289              
            
      end


END
GO