Again there are two ways to handle this question.
First Way: If you have built up a good rapport with the interviewer by now you can ask a more direct question, Are you offering it to me? (with a smile and right body language). If they say “Yes”, you can say that of course, based on what we have discussed till now I am enthusiastic about taking up this position. How soon would you be able to get me a written offer?
Second Way: Alternatively you can say, based on what we have discussed till now, I will be happy to take up this position but there are still certain things that need to be discussed.