bool debug;
  bool imagineMode;
  bool collectCheckingLog = true;
  new LinkedHashSet<S> imaginedFacts;
  LS checkingLog;
  long processingTime;
  new L<IfThen> activeTempRules;
  int evalTimeout = 20000;
  
  void thinkAbout(S s) {
    time "Processing Time For Message"{
      thinkAbout_impl(s);
    }
    processingTime = lastTiming();
  }
  
  void thinkAbout_impl(fS input) {
    final new Thinking t;
    final Map<S, O> tl = getMCThreadLocals(ai_staticVars());
    /*Thread thread = startThread("Think!", r {
      setMCThreadLocals(tl);*/
      t.thinkAbout(input);
    /*});*/
    int n = 0;
    do {
      while (l(t.output) > n)
        postMessage(t.output.get(n++));
      //joinThread(thread, 50);
    } while (!t.done);
    
    activeTempRules.clear();
  }
  
  void _postMessage(S s) { postMessage(s); }
  
  class Thinking {
    long cancelTime = now()+20000;
    new Map<S, Int> ruleScores;
    new LinkedHashSet<S> rewrittenInputs;
    new LinkedHashSet<S> newRewrittenInputs;
    volatile bool posted, done;
    new L<IfThen> rules;
    replace Plan with PlanInMotion.
    new Plan<Runnable> plan;
    new HashSet<S> outputSet;
    LS output = synchroList();

    void postMessage(S s) {
      //_postMessage(s);
      if (outputSet.add(s))
        output.add(s);
      posted = true;
    }
    
    void done() { done = true; }
    
    void thinkAbout(S input) {
      try {
        thinkAbout_impl(input);
      } finally {
        done();
      }
    }
    
    void thinkAbout_impl(fS input0) {
      fS input1 = unixLineBreaks(input0);
      plan.add(r "!initiative" {
        if (!eq(input1, "!initiative")) ret;
        L<IfThen> rules = mL_parsedNLRulesWithoutIDs("Initiative rules");
        for (IfThen rule : shuffledIterator(rules)) {
          Pair<Exp> p = nlLogic_extractFirstCondition(rule.in);
          if (p == null) continue;
          if (nlLogic_isFunc(p.a, 'initiative)) {
            postMessage(nlLogic_text(((Func) p.a).arg));
            IfThen temp = IfThen(p.b, rule.out);
            temp.globalID = aGlobalID();
            print("Have temp rule: " + sfu(temp));
            activeTempRules.add(temp);
            ret with done();
          }
        }
        ret with done();
      });
      
      plan.add(r "!step" {
        new Matches mm;
        if (!startsWith_trim(input1, "!step ", mm)) ret;
        // TODO
      });
      
      runPlanWithCheck(plan, func -> bool { !done });
      if (done) ret;
      
      stdCommands(input1);
      
      S input2 = input1;
      final new LS options;
      if (startsWith(input2, "[")) {
        addAll(options, leadingSquareBracketOptions(input2));
        input2 = dropLeadingSquareBracketStuff(input2);
      }
      
      fS input = input2;
      ai_tg_collectRuleFeedback(ruleScores, null);
      
      newRewrittenInputs.add(input);
      final Map msg = telegram_msg();
      
      final NLLogicChecker_v3 c = new NLLogicChecker_v3 {
        bool checkExpression_impl(Exp e, Matching m) {
          if (e instanceof Literal) {
            // TEXT CONDITIONS
            
            S text = nlLogic_text(e);
            if (eq(text, "authorized"))
              ret telegram_amIAuthorized();
            else if(eq(text, "imagineMode"))
              ret imagineMode;
          }
          
          ret super.checkExpression_impl(e, m);
        }
      };

      if (collectCheckingLog) {
        checkingLog = new L;
        nlLogic_collectCheckingLog(c, checkingLog);
      }
      
      Pair<L<IfThen>, LS> rulesAndFacts = getRulesAndFacts();
      c.facts = reversed(rulesAndFacts.b);
      rules = concatLists_conservative(activeTempRules, reversed(rulesAndFacts.a)); // latest rules first!
      rules = [IfThen r : rules | ai_ruleAccessesInput(r.originalText)];
      c.rules = rules;

      while (!posted && now() < cancelTime && nempty(newRewrittenInputs)) {
        fS s = first(newRewrittenInputs);
        rewrittenInputs.add(s);
        newRewrittenInputs.remove(s);
      
        c.input = s;
        c.recentHistory = recentHistory;
        final new L<RuleWithParams> battleSpace;
    
        applyNLLogicFacts_v4_verbose.set(debug);
        applyNLLogicFacts_v4(c, voidfunc(IfThen rule, NLLogicChecker_v2.Matching m) {
          // Rule matches completely, add to battle space
          
          battleSpace.add(new RuleWithParams(rule, m.matches));
        }, rules);
        
        print("Have " + n2(battleSpace, "possible rule")
          + (empty(battleSpace) ? "" : ": " + joinWithComma(map(func(RuleWithParams r) -> S { r.ruleID() + "/" + toInt(ruleScores.get(r.ruleID())) }, battleSpace))));
        
        bool all = options.contains("all");
        if (!all) nlLogic_battleItOut(battleSpace, c.facts);
        
        L<RuleWithParams> winners = all ? battleSpace : nlLogic_highestScore(battleSpace, ruleScores);
    
        fS msgGlobalID = getString(msg, 'globalID);
        //print("msgGlobalID=" + msgGlobalID);
        for (RuleWithParams r : winners) {
          print("Firing rule " + r.rule.globalID);
          
          // Save rule fire
          if (nempty(msgGlobalID) && nempty(r.rule.globalID)) {
            S fact = format("Rule * fired on message * at *", r.rule.globalID, msgGlobalID, localDateWithMilliseconds());
             if (nempty(r.matches))
               fact += " with vars " + dropPrefix("lhm", struct(r.matches));
            print("Saving rule fire. Mech mode: " + mechMode());
            print(addToMechList("Telegram Rule Fires", print(fact)));
          }
          
          executeRule(c, r);
        }
        
        if (collectCheckingLog)
          print("Checking log length: " + l(checkingLog));
      }
    }
    
    void executeRule(NLLogicChecker_v3 c, RuleWithParams r) {
      // Execute rule
      for (Exp e : nlLogic_unrollAnd(r.rule.out)) {
        e = c.apply(e, r.matches);
        if (e cast Func) {
          S name = e.name, arg = nlLogic_text(e.arg);
          if (eqOneOf(name, 'output, 'say))
            postMessage(arg);
          else if (eq(name, 'fact)) {
            S fact = arg;
            if (imagineMode) {
              if (!containsNL(imaginedFacts, fact)) {
                imaginedFacts.add(fact);
                postMessage("Storing imaginary fact: " + fact);
              }
            } else if (!ai_isQuestion_2(fact) && ai_storeActualFact(fact))
              postMessage("Storing fact: " + fact);
          } else if (eq(name, 'storeRule)) {
            S rule = arg;
            if (!telegram_authorizedToStoreRule(rule)) continue;
            rule = nlLogic_addGlobalID(rule);
            if (mech_changed(appendToMechList_noUniq("NL Logic Examples", "\n" + rule)))
              postMessage("Rule stored");
          } else if (eq(name, 'imagineMode)) {
            imagineMode = match("true", arg);
            if (!imagineMode) imaginedFacts.clear();
          } else if (eq(name, 'input)) {
            S x = arg;
            if (!rewrittenInputs.contains(x) && newRewrittenInputs.add(x))
              print("New rewritten input: " + x);
          } else if (c.checkHelper(e, ai_matchingWrapping(r.matches))) {
          } else
            ret with print("Skipping rule with unknown RHS func: " + e.name);
        } else
          ret with print("Skipping rule with unknown RHS element: " + e);
      }
    }
  } // end class Thinking
 
  Pair<L<IfThen>, LS> getRulesAndFacts() { 
    ret ai_activeRulesAndFacts(imagineMode ? asList(imaginedFacts) : null);
  }

  void stdCommands(S s) {
    s = trim(s);
    
    final new Matches m;
    S procedure = nlLookup(mechMap("Telegram Procedures"), s, m);
    if (procedure != null) {
      procedure = expandDollarRefsToMatches(procedure, m, true);
      print(">> " + procedure);
      postMessage(strOrNull(javaEvalOrInterpret(procedure)));
    }
    
    print("s=" + s);
    S language = 'english;
    if (swic_trim(s, "!german ", m)) {
      language = 'german;
      s = m.rest();
      print("s=" + s);
    }
    ai_setLanguage(language);

    if (swic_trim(s, "!say ", m))
      postMessage(m.rest());
    
    if (eq(s, "!gac"))
      postMessage(random_gac36k());
    
    if (swic_trim(s, "!parse ", m))
      postMessage(ai_renderCulledParseTree(ai_parseToTreeWithGuessing(m.rest())));
    
    if (swic_trim(s, "!simplify ", m))
      postMessage(lines(ai_parseTree_simplifiedTexts(ai_parseToTreeWithGuessing(m.rest()))));
      
    if (swicOneOf_trim(s, m, "!factsFrom ", "!factsFrom\n")) {
      S x = m.rest();
      ai_deriveFacts_debug = leadingSquareBracketOptions(x).contains("debug");
      temp tempSet(NLLogicChecker_v2, staticVerbose := ai_deriveFacts_debug);
      fS _x = dropActuallyLeadingSquareBracketStuff(x);
      postMessage(or2(evalWithTimeout_text(evalTimeout, func {
        lines(ai_factsFromNewFacts(tlft(_x)))
      }), "No new facts found"));
    }
    
    if (swic_trim(s, "!askBack ", m)) {
      NLLogicChecker_v2 c = nlLogicCheckerWithRulesAndFacts(getRulesAndFacts());
      c.input = m.rest();
      askBack(c);
    }

    if (swic_trim(s, "!askBackAboutFact ", m)) {
      NLLogicChecker_v2 c = nlLogicCheckerWithRulesAndFacts(getRulesAndFacts());
      c.facts = listPlus_inFront(c.facts, m.rest());
      askBack(c);
    }

    /*if (telegram_amIAuthorized())*/ {
      if (telegram_amIFullyAuthorized()) {
        bool freshMe = swic_trim(s, "!fresh ", m);
        if (freshMe || eq(s, "!fresh")) { dm_refreshTranspiler(); if (!freshMe) postMessage("OK"); }
      
        if (swic_trim(s, "!eval ", m))
          postMessage(pcallOrExceptionText(func { strOrNull(javaEvalOrInterpret(m.rest())) }));
        
        if (freshMe || swic_trim(s, "!real-eval ", m))
          postMessage(evalWithTimeout_text(evalTimeout, func {
            javaEval(m.rest())
          }));
      }
        
      if (swic_trim(s, "!rule ", m)) {
        S rule = m.rest();
        if (!telegram_authorizedToStoreRule(rule)) ret;
        LS rules = trimAll(ai_unparsedTalkRules());
        if (!contains(rules, rule)) { // TODO: ignore global IDs
          rule = nlLogic_addGlobalID(rule);
          appendToMechList_noUniq("NL Logic Examples", "\n" + rule);
          postMessage("Rule saved as " + leadingSquareBracketOptions_id(rule) + ". Have " + n2(l(rules)+1, "rule") + ".");
        }
      }
      
      if (swic_trim(s, "!fact ", m)) {
        S fact = m.rest();
        LS facts = mL("Random facts");
        if (!contains(facts, fact)) {
          appendToMechList_noUniq("Random facts", fact);
          postMessage("Fact saved. Have " + n2(l(facts)+1, "fact") + ".");
        }
      }
      
      if (eqic(s, "!deriveFacts"))
        postMessage("Got " + n2(ai_applyFactToFactRules(), "fact") + ". Total: " + l(mL("Derived facts")));
        
      // end of authorized functions
    }
  }

  void askBack(NLLogicChecker_v2 c) {  
    L<RuleFailInfo> fails = nlLogic_sortedRuleFails(nlLogic_ruleFails(c, c.rules));
    print("Have " + n2(fails, "fail"));
    //pnl(fails);
    postMessage(lines(nlLogic_unresolvedFactsToQuestions(fails)));
  }

Began life as a copy of #1018038