I'm sorry you have continued problems with him.
Yes, I am afraid that you will have to do whatever the Court's decide as far as contact with his son. I am unsure what you mean by "he did not adhere to the confirmation rules in the contract" in regard to the mediation. Did he really show up and you weren't there?
Show up to all Court dates. Bring all documentation you have regarding his behavior. Hopefully it will be supervised visitation.
In a perfect world no active alcoholic would have contact with their children. Unfortunately the Court's don't see it that way. The best you can do is have a very structured visitation agreement including a "no alcohol" clause, supervision and the like.