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(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
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type proposal = Protocol_hash.t

type ballot = Yay | Nay | Pass

let ballot_encoding =
  let of_int8 = function
    | 0 -> Ok Yay
    | 1 -> Ok Nay
    | 2 -> Ok Pass
    | _ -> Error "ballot_of_int8"
  in
  let to_int8 = function Yay -> 0 | Nay -> 1 | Pass -> 2 in
  let open Data_encoding in
  (* union *)
  splitted
    ~binary:(conv_with_guard to_int8 of_int8 int8)
    ~json:(string_enum [("yay", Yay); ("nay", Nay); ("pass", Pass)])

let equal_ballot a b =
  match (a, b) with Yay, Yay | Nay, Nay | Pass, Pass -> true | _ -> false

let pp_ballot ppf = function
  | Yay -> Format.fprintf ppf "yay"
  | Nay -> Format.fprintf ppf "nay"
  | Pass -> Format.fprintf ppf "pass"