let download ~base_url ~output_file =
  let open Bos in
  let uri =
    Uri.with_path (Uri.of_string base_url) "/management/keys/" |> Uri.to_string
  in
  let wget = Cmd.(v "wget" % "-O" % output_file % uri) in
  OS.Cmd.run wget

(* CLI *)

open Cmdliner
open Cmdliner.Term.Syntax

let output =
  let doc = "File to save data to be signed." in
  Arg.(
    value & opt filepath "management_keys.json" & info [ "o"; "output" ] ~doc)

let base_url =
  let doc = "Base url of the exchange." in
  Arg.(value & opt string "http://localhost:3434/" & info [ "base-url" ] ~doc)

let download_cmd =
  let doc = "Downloads /management/keys/" in
  let man =
    [ `S Manpage.s_description; `P "$(cmd) download /management/keys." ]
  in
  Cmd.make (Cmd.info "offline" ~version:"%%VERSION%%" ~doc ~man)
  @@
  let+ output_file = output and+ base_url = base_url in
  match download ~base_url ~output_file with
  | Error (`Msg err) ->
      Fmt.epr "Download failure: %s@." err;
      exit 1
  | Ok () -> ()

let main () = Cmd.eval download_cmd
let () = if !Sys.interactive then () else exit (main ())