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(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2022 Marigold, <contact@marigold.dev>                       *)
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open Script_int

type t = n num

let of_n n =
  if Compare.Int.(Script_int.(compare n zero_n) > 0) then Some (n : t) else None

let of_z z = Option.bind (is_nat z) of_n

let of_zint z = of_z @@ of_zint z

let add = add_n

let sub a b = of_z @@ sub a b

let one = one_n

let encoding =
  let open Data_encoding in
  conv_with_guard
    to_zint
    (fun n -> Option.value_e ~error:"expecting positive number" @@ of_zint n)
    n