(* $Id$ *)

open Gaux
open Gtk

type data =
  | NONE
  | CHAR of char
  | BOOL of bool
  | INT of int
  | FLOAT of float
  | STRING of string option
  | OBJECT of unit obj option
  | POINTER of Gpointer.boxed option

type 'a result =
  [ `NONE
  | `CHAR of char | `BOOL of bool | `INT of int
  | `UINT of int32 | `LONG of nativeint | `ULONG of nativeint
  | `FLOAT of float | `DOUBLE of float
  | `STRING of string option | `ENUM of int | `FLAGS of int32
  | `BOXED of Gpointer.boxed option
  | `POINTER of Gpointer.boxed option
  | `OBJECT of 'a obj option ]

module Arg = struct
  type t
  external shift : t -> pos:int -> t = "ml_gtk_arg_shift"
  external get_type : t -> gtk_type = "ml_gtk_arg_get_type"
  external get : t -> data = "ml_gtk_arg_get"
  external set_retloc : t -> 'a result -> unit = "ml_gtk_arg_set_retloc"
  external get_pointer : t -> Gpointer.boxed = "ml_gtk_arg_get_pointer"
  external get_nativeint : t -> nativeint = "ml_gtk_arg_get_nativeint"

  (* Safely get an argument *)
  (*
  external get_char : t -> char = "ml_gtk_arg_get_char"
  external get_bool : t -> bool = "ml_gtk_arg_get_bool"
  external get_int : t -> int = "ml_gtk_arg_get_int"
  external get_float : t -> float = "ml_gtk_arg_get_float"
  external get_string : t -> string option = "ml_gtk_arg_get_string"
  external get_object : t -> unit obj option = "ml_gtk_arg_get_object"
  *)
  (* Safely set a result
     Beware: this is not the opposite of get, arguments and results
     are two different ways to use GtkArg. *)
  (*
  external set_char : t -> char -> unit = "ml_gtk_arg_set_char"
  external set_bool : t -> bool -> unit = "ml_gtk_arg_set_bool"
  external set_int : t -> int -> unit = "ml_gtk_arg_set_int"
  external set_nativeint : t -> nativeint -> unit = "ml_gtk_arg_set_nativeint"
  external set_float : t -> float -> unit = "ml_gtk_arg_set_float"
  external set_string : t -> string -> unit = "ml_gtk_arg_set_string"
  external set_pointer : t -> Gpointer.boxed -> unit = "ml_gtk_arg_set_pointer"
  external set_object : t -> 'a obj -> unit = "ml_gtk_arg_set_object"
  *)
end

open Arg
type raw_obj
type t = { referent: raw_obj; nargs: int; args: Arg.t }
let nth arg ~pos =
  if pos < 0 || pos >= arg.nargs then invalid_arg "GtkArg.Vect.nth";
  shift arg.args ~pos
let result arg =
  if arg.nargs < 0 then invalid_arg "GtkArgv.result";
  shift arg.args ~pos:arg.nargs
external wrap_object : raw_obj -> unit obj = "Val_GtkObject"
let referent arg =
  if arg.referent == Obj.magic (-1) then invalid_arg "GtkArgv.referent";
  wrap_object arg.referent
let get_result_type arg = get_type (result arg)
let get_type arg ~pos = get_type (nth arg ~pos)
let get arg ~pos = get (nth arg ~pos)
let set_result arg = set_retloc (result arg)

let get_args arg =
  let rec loop args ~pos =
    if pos < 0 then args
    else loop (get arg ~pos :: args) ~pos:(pos-1)
  in loop [] ~pos:(arg.nargs - 1)

let get_pointer arg ~pos = get_pointer (nth arg ~pos)
let get_nativeint arg ~pos = get_nativeint (nth arg ~pos)

(*
let get_char arg ~pos = get_char (nth arg ~pos)
let get_bool arg ~pos = get_bool (nth arg ~pos)
let get_int arg ~pos = get_int (nth arg ~pos)
let get_float arg ~pos = get_float (nth arg ~pos)
let get_string arg ~pos = get_string (nth arg ~pos)
let get_object arg ~pos = get_object (nth arg ~pos)
let set_result_char arg = set_char (result arg)
let set_result_bool arg = set_bool (result arg)
let set_result_int arg = set_int (result arg)
let set_result_nativeint arg = set_nativeint (result arg)
let set_result_float arg = set_float (result arg)
let set_result_string arg = set_string (result arg)
let set_result_pointer arg = set_pointer (result arg)
let set_result_object arg = set_object (result arg)
*)

external string_at_pointer : ?pos:int -> ?len:int -> Gpointer.boxed -> string
    = "ml_string_at_pointer"
external int_at_pointer : Gpointer.boxed -> int
    = "ml_int_at_pointer"