let expect mgs =
  let l = read_line () in
  begin try
    let (s, f) = List.find
      (fun (s, _) ->
           String.length l >= String.length s
        && String.sub l 0 (String.length s) = s)
      mgs
    in f (String.sub l (String.length s)
          (String.length l - String.length s))
  with
    Not_found ->
      Format.eprintf "Unexpected '%s'.@." l;
      exit 1
  end

let finished _ =
  print_string "Fair enough\n"

let rec turn _ =
  expect [
    "Your turn",
      (fun _ ->
        if Random.int 2 = 0 then Unix.sleep 1;
        print_string "Play this_is_a_word\n";
        expect [ "OK", turn ]);
    "Play ", turn;
    "Tie", finished;
    "You win", finished;
    "You lose", finished;
    "Eliminated", finished
  ]

let () =
  Random.self_init ();
  expect [
    "Hello dummy_game",
    (fun _ -> print_string "Hello dummy_game\n";
        turn "")
  ];