// Answer Questions Bot knows how to answer questions to any other bot.

!747

m {

  static new AList<Question> questions;

  !include #1001495 // AList

  static class Question {

    S botID;

    S questionPattern;

    new Code code;

  }

  static class Code {

    S snippetID;

    boolean blessed; // is it known to be safe to run?

  }

  p {

    readLocally("questions");

    makeAndroid3("Questions Bot.");

  }

  static synchronized S answer(S s, L<S> history) {

    new Matches m;

    if (match3("how can question * to bot * be answered?", s, m)) {

      S botID = formatSnippetID(m.unq(0));

      S text = m.unq(1);

      L<Question> l = findQuestion(botID, text);

      if (l.isEmpty())

        ret "I don't know.";

      Code code = l.get(0).code;

      ret format3("code: *, (" + (code.blessed ? "blessed" : "non-blessed") + ")", code.snippetID);

    }

    if (match3("add: bot *, question *, code snippet: *, blessed: *", s, m)) {

      new Question q;

      q.botID = m.fsi(0);

      q.questionPattern = m.unq(1);

      q.code.snippetID = m.fsi(2);

      q.code.blessed = m.bool(3);

    }

    ret standardQuery(s, "questions");

  }

  static L<Question> findQuestion(S botID, S text) {

    new L<Question> l;

    // It is thread-safe to iterate over an AList :)

    for (Question q : questions)

      if (sameSnippetID(q.botID, botID)

        && match3(q.questionPattern, text))

        l.add(q);

    ret l;

  }

}