(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.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 *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense,  *)
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(* Software is furnished to do so, subject to the following conditions:      *)
(*                                                                           *)
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(* in all copies or substantial portions of the Software.                    *)
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(* DEALINGS IN THE SOFTWARE.                                                 *)
(*                                                                           *)
(*****************************************************************************)

type t = {
  total_sent : int64;
  total_recv : int64;
  current_inflow : int;
  current_outflow : int;
}

let empty =
  {total_sent = 0L; total_recv = 0L; current_inflow = 0; current_outflow = 0}

let print_size ppf sz =
  let ratio n = float_of_int sz /. float_of_int (1 lsl n) in
  if sz < 1 lsl 10 then Format.fprintf ppf "%d B" sz
  else if sz < 1 lsl 20 then Format.fprintf ppf "%.2f kiB" (ratio 10)
  else Format.fprintf ppf "%.2f MiB" (ratio 20)

let print_size64 ppf sz =
  let open Int64 in
  let ratio n = to_float sz /. float_of_int (1 lsl n) in
  if sz < shift_left 1L 10 then Format.fprintf ppf "%Ld B" sz
  else if sz < shift_left 1L 20 then Format.fprintf ppf "%.2f kiB" (ratio 10)
  else if sz < shift_left 1L 30 then Format.fprintf ppf "%.2f MiB" (ratio 20)
  else if sz < shift_left 1L 40 then Format.fprintf ppf "%.2f GiB" (ratio 30)
  else Format.fprintf ppf "%.2f TiB" (ratio 40)

let pp ppf stat =
  Format.fprintf
    ppf
    "↗ %a (%a/s) ↘ %a (%a/s)"
    print_size64
    stat.total_sent
    print_size
    stat.current_outflow
    print_size64
    stat.total_recv
    print_size
    stat.current_inflow

let encoding =
  let open Data_encoding in
  def "p2p_stat" ~description:"Statistics about the p2p network."
  @@ conv
       (fun {total_sent; total_recv; current_inflow; current_outflow} ->
         (total_sent, total_recv, current_inflow, current_outflow))
       (fun (total_sent, total_recv, current_inflow, current_outflow) ->
         {total_sent; total_recv; current_inflow; current_outflow})
       (obj4
          (req "total_sent" int64)
          (req "total_recv" int64)
          (req "current_inflow" int31)
          (req "current_outflow" int31))

let () = Data_encoding.Registration.register ~pp encoding