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static new TreeMap<Int, startVMLister_Data> startVMLister_vms;
static Lock startVMLister_lock = lock();

sclass startVMLister_Data {
  long started;
  int port;
  S vmID;
  bool hidden;
}

static void startVMLister() {
  S bot = "VM Lister.";
  if (!hasBot(bot)) {
    makeBot(bot, f startVMLister_answer);
    thread { startVMLister_scan(); }
  }
}

static S startVMLister_answer(S s) {
  lock startVMLister_lock;
  
  new Matches m;
  if "started vm * *" {
    int port = parseInt($1);
    startVMLister_vms.put(port, nu(startVMLister_Data, started := now(), +port,
      vmID := $2));
    ret "OK";
  }
  
  if "hiding vm *" {
    startVMLister_Data vm = startVMLister_vms.get(parseInt($1));
    if (vm != null) vm.hidden = true;
    ret "OK";
  }
  
  if "unhiding vm *" {
    startVMLister_Data vm = startVMLister_vms.get(parseInt($1));
    if (vm != null) vm.hidden = false;
    ret "OK";
  }
  
  if "killing vm *" {
    startVMLister_vms.remove(parseInt($1));
    ret "OK";
  }
  
  if "number of vms" ret lstr(startVMLister_vms);
  if "number of hidden vms" ret str(countWhere(values(startVMLister_vms), hidden := true));
  
  if "scan vms" {
    startVMLister_scan();
    ret "OK, found " + n(startVMLister_vms, "VM");
  }
  
  null;
}

svoid startVMLister_scan {
  lock startVMLister_lock;
  
  new TreeMap<Int, startVMLister_Data> vms;
  
  for (DialogIO io : talkToAllVMs()) try {
    new startVMLister_Data vm;
    vm.port = io.getPort();
    vm.vmID = io.ask("get vm id");
    vm.hidden = isYes(io.ask("is hidden vm"));
    vm.started = parseLongOpt(io.ask("vm start date"));
    vms.put(vm.port, vm);
  } finally {
    io.close();
  }
  
  copyMap(vms, startVMLister_vms);
}