(*****************************************************************************)
(*                                                                           *)
(* 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 *)
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(* Software is furnished to do so, subject to the following conditions:      *)
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include Time

type time = Time.t

type error += Timestamp_add (* `Permanent *)

type error += Timestamp_sub (* `Permanent *)

let () =
  register_error_kind
    `Permanent
    ~id:"timestamp_add"
    ~title:"Timestamp add"
    ~description:"Overflow when adding timestamps."
    ~pp:(fun ppf () -> Format.fprintf ppf "Overflow when adding timestamps.")
    Data_encoding.empty
    (function Timestamp_add -> Some () | _ -> None)
    (fun () -> Timestamp_add) ;
  register_error_kind
    `Permanent
    ~id:"timestamp_sub"
    ~title:"Timestamp sub"
    ~description:"Subtracting timestamps resulted in negative period."
    ~pp:(fun ppf () ->
      Format.fprintf ppf "Subtracting timestamps resulted in negative period.")
    Data_encoding.empty
    (function Timestamp_sub -> Some () | _ -> None)
    (fun () -> Timestamp_sub)

let of_seconds_string s = Option.map Time.of_seconds (Int64.of_string_opt s)

let to_seconds_string s = Int64.to_string (to_seconds s)

let pp = pp_hum

let ( +? ) x y =
  let span = Period_repr.to_seconds y in
  let t64 = Time.add x span in
  if t64 < Time.of_seconds 0L then error Timestamp_add else ok t64

let ( -? ) x y =
  record_trace Timestamp_sub (Period_repr.of_seconds (Time.diff x y))