!752

static S atEleuPrefix = "<@u0hb7bpkm>";
static int maxLen = 100;

static PersistentMap<S, S> inToOut;
static S last;

p {
  inToOut = new PersistentMap("inToOut");
  load("last");
}

synchronized answer {
  if (neq(getChannel(), "devchannel, #talkingbots")) null;
  
  if (match("clear ua ub uc", s) && master()) {
    inToOut.clear();
    ret getProgramID() + " cleared";
  }
  
  s = s.trim();
  boolean at = startsWithIgnoreCase(s, atEleuPrefix);
  if (at)
    s = dropPrefixIgnoreCase(atEleuPrefix, s);

  S in = simplifySentence2(s);
  
  saveIt(s, in, at);
  
  S out = inToOut.get(in);
  print("1002967: in=" + in + ", out=" + out);
  if (nempty(out)) {
    // TODO: bump in LRU
    ret out;
  }
}

static void saveIt(S s, S in, boolean at) {
  S lastOut = getLastOut();
  if (nempty(lastOut))
    saveEntry(lastOut, s);
  if (!at && nempty(last))
    saveEntry(last, s);
  last = s;
  save("last");
}

static void saveEntry(S in, S out) {
  if (l(in) > maxLen || l(out) > maxLen) ret;
  in = simplifySentence2(in);
  print(getProgramID() + " saving: " + in + " -> " + out);
  inToOut.put(in, out);
}

static S getLastOut() {
  ret (S) callOpt(getBot("#1002979"), "getLastAnswer");
}