let cache = NUri.UriHash.create 313;;

let get_checked_obj u =
  try NUri.UriHash.find cache u
  with Not_found ->
    let ouri = NUri.ouri_of_nuri u in
    let o,_ = 
      CicEnvironment.get_cooked_obj ~trust:false CicUniv.oblivion_ugraph ouri 
    in
    (* FIX: add all objects to the environment and give back the last one *)
    let no = HExtlib.list_last (OCic2NCic.convert_obj ouri o) in
    NUri.UriHash.add cache u no;
    no
;;

let get_obj u =
  try true, NUri.UriHash.find cache u
  with Not_found ->
    (* in th final implementation should get it from disk *)
    let ouri = NUri.ouri_of_nuri u in
    let o,_ = 
      CicEnvironment.get_cooked_obj ~trust:false CicUniv.oblivion_ugraph ouri 
    in
    (* here we should freeze it *)
    false, HExtlib.list_last (OCic2NCic.convert_obj ouri o)
;;

let add_obj (u,_,_,_,_ as o) =
  (* we should unfreeze it *)
  NUri.UriHash.add cache u o
;;

let get_checked_def = function
  | NReference.Ref (_, uri, NReference.Def) ->
      (match get_checked_obj uri with
      | _,height,_,_, NCic.Constant (rlv,name,Some bo,ty,att) ->
          rlv,name,bo,ty,att,height
      | _,_,_,_, NCic.Constant (_,_,None,_,_) ->
          prerr_endline "get_checked_def on an axiom"; assert false
      | _ -> prerr_endline "get_checked_def on a non def 2"; assert false)
  | _ -> prerr_endline "get_checked_def on a non def"; assert false
;;

let get_checked_indtys = function
  | NReference.Ref (_, uri, NReference.Ind n) ->
      (match get_checked_obj uri with
      | _,_,_,_, NCic.Inductive (inductive,leftno,tys,att) ->
        inductive,leftno,tys,att,n
      | _ -> prerr_endline "get_checked_indtys on a non ind 2"; assert false)
  | _ -> prerr_endline "get_checked_indtys on a non ind"; assert false
;;

let get_checked_fix_or_cofix b = function
  | NReference.Ref (_, uri, NReference.Fix (fixno,_)) ->
      (match get_checked_obj uri with
      | _,height,_,_, NCic.Fixpoint (is_fix,funcs,att) when is_fix = b ->
         let rlv, name, _, ty, bo = List.nth funcs fixno in
         rlv, name, bo, ty, att, height
      | _ ->prerr_endline "get_checked_(co)fix on a non (co)fix 2";assert false)
  | _ -> prerr_endline "get_checked_(co)fix on a non (co)fix"; assert false
;;
let get_checked_fix r = get_checked_fix_or_cofix true r;;
let get_checked_cofix r = get_checked_fix_or_cofix false r;;

let get_indty_leftno = function 
  | NReference.Ref (_, uri, NReference.Ind _) 
  | NReference.Ref (_, uri, NReference.Con _) ->
      (match get_checked_obj uri with
      | _,_,_,_, NCic.Inductive (_,left,_,_) -> left
      | _ ->prerr_endline "get_indty_leftno called on a non ind 2";assert false)
  | _ -> prerr_endline "get_indty_leftno called on a non indty";assert false