(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
(* Copyright (c) 2018 Dynamic Ledger Solutions, Inc. <contact@tezos.com>     *)
(* Copyright (c) 2018 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 *)
(* the rights to use, copy, modify, merge, publish, distribute, sublicense,  *)
(* and/or sell copies of the Software, and to permit persons to whom the     *)
(* Software is furnished to do so, subject to the following conditions:      *)
(*                                                                           *)
(* The above copyright notice and this permission notice shall be included   *)
(* in all copies or substantial portions of the Software.                    *)
(*                                                                           *)
(* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR*)
(* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,  *)
(* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL   *)
(* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER*)
(* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING   *)
(* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER       *)
(* DEALINGS IN THE SOFTWARE.                                                 *)
(*                                                                           *)
(*****************************************************************************)

type ('a, 'b) lwt_format = ('a, Format.formatter, unit, 'b Lwt.t) format4

class type printer =
  object
    method error : ('a, 'b) lwt_format -> 'a

    method warning : ('a, unit) lwt_format -> 'a

    method message : ('a, unit) lwt_format -> 'a

    method answer : ('a, unit) lwt_format -> 'a

    method log : string -> ('a, unit) lwt_format -> 'a
  end

class type prompter =
  object
    method prompt : ('a, string tzresult) lwt_format -> 'a

    method prompt_password : ('a, Bigstring.t tzresult) lwt_format -> 'a
  end

class type io =
  object
    inherit printer

    inherit prompter
  end

class type wallet =
  object
    method load_passwords : string Lwt_stream.t option

    method read_file : string -> string tzresult Lwt.t

    method with_lock : (unit -> 'a Lwt.t) -> 'a Lwt.t

    method load :
      string -> default:'a -> 'a Data_encoding.encoding -> 'a tzresult Lwt.t

    method write :
      string -> 'a -> 'a Data_encoding.encoding -> unit tzresult Lwt.t
  end

class type chain =
  object
    method chain : Shell_services.chain
  end

class type block =
  object
    method block : Shell_services.block

    method confirmations : int option
  end

class type io_wallet =
  object
    inherit printer

    inherit prompter

    inherit wallet
  end

class type io_rpcs =
  object
    inherit printer

    inherit prompter

    inherit RPC_context.json
  end

class type ui =
  object
    method sleep : float -> unit Lwt.t

    method now : unit -> Ptime.t
  end

class type full =
  object
    inherit printer

    inherit prompter

    inherit wallet

    inherit RPC_context.json

    inherit chain

    inherit block

    inherit ui
  end

class simple_printer : (string -> string -> unit Lwt.t) -> printer

class proxy_context : full -> full

val null_printer : printer