(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2019 Nomadic Labs, <contact@nomadic-labs.com>               *)
(*                                                                           *)
(* Permission is hereby granted, free of charge, to any person obtaining a   *)
(* copy of this software and associated documentation files (the "Software"),*)
(* to deal in the Software without restriction, including without limitation *)
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(* Software is furnished to do so, subject to the following conditions:      *)
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(* DEALINGS IN THE SOFTWARE.                                                 *)
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let animation =
  [| "|.....|";
     "|o....|";
     "|oo...|";
     "|ooo..|";
     "|.ooo.|";
     "|..ooo|";
     "|...oo|";
     "|....o|";
     "|.....|";
     "|.....|";
     "|.....|";
     "|.....|" |]

let init = String.make (String.length animation.(0)) ' '

let clean = String.make (String.length animation.(0)) '\b'

let animation = Array.map (fun x -> clean ^ x) animation

let number_of_frames = Array.length animation

let make_with_animation ppf ~make ~on_retry seed =
  Format.fprintf ppf "%s%!" init ;
  let rec loop n seed =
    let start = Mtime_clock.counter () in
    Format.fprintf ppf "%s%!" animation.(n mod number_of_frames) ;
    match make seed with
    | Ok v ->
        v
    | Error r ->
        let time = Mtime_clock.count start in
        let v = on_retry time r in
        loop (n + 1) v
  in
  let result = loop 0 seed in
  Format.fprintf ppf "%s%s\n%!" clean init ;
  result