sclass Feeder {
  O sucker, origSucker;
  new L<S> strategyIDs;
  new L<Strategy> strategies;
  S text;
  
  bool aggressiveKeepalive; // keep strategies
  int round;
  
  sclass Strategy {
    S id;
    O f;
    S lastCode;
    
    *() {}
    *(S *id, O *f) {}
  }
  
  *() {}
  *(O sucker, S... strategyIDs) {
    setSucker(sucker);
    addAll(this.strategyIDs, strategyIDs);
    loadStrategies();
  }
  
  void setSucker(O sucker) {
    origSucker = sucker;
    if (sucker instanceof S) {
      print("Waking...");
      sucker = run((S) sucker);
    }
    this.sucker = sucker;
    text = (S) callOpt(sucker, "getText");
  }
  
  void loadStrategies() {
    print("Loading strategies...");
    for i over strategyIDs: pcall {
      print((i+1) + "/" + l(strategyIDs));
      S id = strategyIDs.get(i);
      strategies.add(new Strategy(id, loadStrategy(id)));
      print("OK");
    }
  }

  bool oneRound() {
    if (empty(strategies)) cleanExit("No more strategies");
    ++round;
    bool change = false;
    for i over strategies: pcall {
      Strategy strategy = strategies.get(i);
      ping();
      
      // call strategy
      
      print("Round " + round + ", target " + origSucker + ", strategy " + strategy.id);
      S lua = callStrategy(strategy.f, text);
      //print("CODE:\n" + indentx(lua));
      bool done = eq(lua, "done");
      if (done ||
        (!aggressiveKeepalive && eq(lua, strategy.lastCode))) {
        print(done ? "Strategy done - dropping" : "Same code twice in a row - dropping strategy");
        strategies.remove(i--);
        continue;
      }
      strategy.lastCode = lua;
  
      S desc = "L " + lua;
      O algo = makeLuaTextPredictAlgoFor(desc, sucker);
      
      O newBest = callOpt(sucker, "suck", desc, algo);
      double score = cast get(sucker, "lastScore");
      if (isTrue(newBest)) {
        print("NEW BEST!!!!!");
        change = true;
      }
    }
    ret change;
  }
  
  // call reset function on each strategy 
  void resetStrategies() {
    for (Strategy s : strategies)
      callOpt(s.f, "reset");
  }
  
  double highestScore() {
    ret (double) call(sucker, "highestScore");
  }
  
  S highestDesc() {
    ret (S) call(sucker, "highestDesc");
  }
  
  int pivotLength() {
    ret (int) get(sucker, "pivotLength");
  }
  
  void nextPivotLength() {
    int pivotLength = l(highestDesc())-1;
    if (pivotLength <= 0) fail("Too short");
    set(sucker, "pivotLength", pivotLength);
    print("Pivot length now: " + pivotLength);
    call(sucker, "reset");
  }
}