(**************************************************************************)
(*                                                                        *)
(*    Copyright (c) 2014 - 2016.                                          *)
(*    Dynamic Ledger Solutions, Inc. <contact@tezos.com>                  *)
(*                                                                        *)
(*    All rights reserved. No warranty, explicit or implicit, provided.   *)
(*                                                                        *)
(**************************************************************************)

(* Tezos Command line interface - Main Program *)

open Lwt.Infix
open Client_commands
open Error_monad

let cctxt config rpc_config =
  let startup =
    CalendarLib.Printer.Precise_Calendar.sprint
      "%Y-%m-%dT%H:%M:%SZ"
      (CalendarLib.Calendar.Precise.now ()) in
  let log channel msg = match channel with
    | "stdout" ->
        print_endline msg ;
        Lwt.return ()
    | "stderr" ->
        prerr_endline msg ;
        Lwt.return ()
    | log ->
        let (//) = Filename.concat in
        Lwt_utils.create_dir (config.base_dir // "logs" // log) >>= fun () ->
        Lwt_io.with_file
          ~flags: Unix.[ O_APPEND ; O_CREAT ; O_WRONLY ]
          ~mode: Lwt_io.Output
          Client_commands.(config.base_dir // "logs" // log // startup)
          (fun chan -> Lwt_io.write chan msg) in
  Client_commands.make_context ~config ~rpc_config log

(* Main (lwt) entry *)
let main () =
  Random.self_init () ;
  Sodium.Random.stir () ;
  Lwt.catch begin fun () ->
    let parsed_config_file, block = Client_config.preparse_args Sys.argv in
    let rpc_config : Client_rpcs.config = {
      Client_rpcs.default_config with
      host = parsed_config_file.node_addr ;
      port = parsed_config_file.node_port ;
      tls = parsed_config_file.tls ;
    } in
    begin
      Client_node_rpcs.Blocks.protocol rpc_config block >>= function
      | Ok version ->
          Lwt.return (Some version, Client_commands.commands_for_version version)
      | Error errs ->
          Format.eprintf
            "@[<v 2>Ignored error:@,Failed to acquire the protocol version from the node@,%a@."
            (Format.pp_print_list pp) errs ;
          Lwt.return (None, [])
    end >>= fun (_version, commands_for_version)  ->
    let commands =
      Client_generic_rpcs.commands @
      Client_network.commands () @
      Client_keys.commands () @
      Client_protocols.commands () @
      Client_helpers.commands () @
      commands_for_version in
    (Client_config.parse_args
       (Cli_entries.usage ~commands)
       (Cli_entries.inline_dispatch commands)
       Sys.argv >>=? fun (command, parsed_args) ->
     let config : Client_commands.cfg = {
       base_dir = parsed_config_file.base_dir ;
       force = parsed_args.force ;
       block ;
       web_port = Client_commands.default_cfg.web_port ;
     } in
     let rpc_config =
       if parsed_args.print_timings then
         { rpc_config with
           logger = Client_rpcs.timings_logger Format.err_formatter }
       else if parsed_args.log_requests
       then {rpc_config with logger = Client_rpcs.full_logger Format.err_formatter }
       else rpc_config
     in
     command (cctxt config rpc_config)) >>= function
    | Ok () ->
        Lwt.return 0
    | Error errs ->
        Format.eprintf "@[<v 2>Fatal error:@,%a@.\
                        Try `-help` for a list of options and commands.@."
          (Format.pp_print_list Error_monad.pp) errs ;
        Lwt.return 1
  end begin function
    | Arg.Help help ->
        Format.printf "%s%!" help ;
        Lwt.return 0
    |  Client_commands.Version_not_found ->
        Format.eprintf "Unknown protocol version, try `list versions`.@." ;
        Lwt.return 1
    | Failure message ->
        Format.eprintf
          "Fatal error: %s@.\
           Try `-help` for a list of options and commands.@." message ;
        Lwt.return 1
    | exn ->
        Format.printf "Fatal internal error: %s@."
          (Printexc.to_string exn) ;
        Lwt.return 1
  end

(* Where all the user friendliness starts *)
let () = Pervasives.exit (Lwt_main.run (main ()))