(**************************************************************************)
(*                                                                        *)
(*    Copyright (c) 2014 - 2016.                                          *)
(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
(*                                                                        *)
(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
(*                                                                        *)
(**************************************************************************)

type t = int32
type cycle = t

let encoding = Data_encoding.int32
let arg =
    let construct = Int32.to_string in
    let destruct str =
      match Int32.of_string str with
      | exception _ -> Error "Cannot parse cycle"
      | cycle -> Ok cycle in
    RPC.Arg.make
      ~descr:"A cycle integer"
      ~name: "block_cycle"
      ~construct
      ~destruct

let pp ppf cycle = Format.fprintf ppf "%ld" cycle

include (Compare.Int32 : Compare.S with type t := t)

let root = 0l
let succ = Int32.succ
let pred = function
  | 0l -> None
  | i -> Some (Int32.pred i)

let to_int32 i = i

let of_int32_exn l =
  if Compare.Int32.(l >= 0l)
  then l
  else invalid_arg "Level_repr.Cycle.of_int32"