module Report = Qsp_syntax.Report

let input_files = ref []

let usage =
  Printf.sprintf "%s input_file" (Filename.basename Sys.executable_name)

let anon_fun filename = input_files := filename :: !input_files
let level_value = ref None
let reset_line = ref false
let interractive = ref true

type filters = { level : Report.level option }

type t = { reset_line : bool; filters : filters; interractive : bool }
(** All the arguments given from the command line *)

let level : string -> unit =
 fun str_level ->
  match Report.level_of_string str_level with
  | Ok level_ -> level_value := Some level_
  | Error e ->
      print_endline e;
      exit 1

let speclist =
  let common_arguments =
    [
      ( "--version",
        Arg.Unit
          (fun () ->
            Printf.printf "Version %s\n" Tools.Git_hash.revision;
            exit 0),
        "\tDisplay the version of the application and exit" );
      ("--level", Arg.String level, "\tMessage level [debug, warn, error]");
      ( "--global",
        Arg.Set reset_line,
        "\tEach line is refered from the begining of the file and not the \
         location" );
    ]
  and windows_arguments =
    match Sys.os_type with
    | "Win32" ->
        [
          ( "--no-prompt",
            Arg.Clear interractive,
            "\tDo not ask the user to press enter after processing the source"
          );
        ]
    | _ ->
        interractive := false;
        []
  in
  common_arguments @ windows_arguments

let parse : unit -> string list * t =
 fun () ->
  let () = Arg.parse (Arg.align speclist) anon_fun usage in

  match !input_files with
  | [] ->
      Arg.usage (Arg.align speclist) usage;
      prerr_endline "";
      prerr_endline "Error, you should provide at least one file to parse.";

      exit 1
  | _ ->
      let filters = { level = !level_value } in
      ( !input_files,
        { reset_line = !reset_line; filters; interractive = !interractive } )