(*****************************************************************************)
(*                                                                           *)
(* Open Source License                                                       *)
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open Encoding

type case_tag = Tag of (int * string)

let case ~title ?description (Tag (tag, kind)) e proj inj =
  if not (is_obj e) then
    raise
      (Invalid_argument
         "Data_encoding.SaferEncoding.case: encoding must be an obj") ;
  let e = merge_objs (obj1 (req "kind" (constant kind))) e in
  case
    ~title
    ?description
    (Encoding.Tag tag)
    e
    (fun x -> match proj x with None -> None | Some p -> Some ((), p))
    (fun ((), x) -> inj x)

let matched ?tag_size (tag, kind) e v =
  if not (is_obj e) then
    raise
      (Invalid_argument
         "Data_encoding.SaferEncoding.case: encoding must be an obj") ;
  let e = merge_objs (obj1 (req "kind" (constant kind))) e in
  matched ?tag_size tag (conv (fun x -> ((), x)) (fun ((), x) -> x) e) v