(* Copyright (C) 2004, HELM Team.
 * 
 * This file is part of HELM, an Hypertextual, Electronic
 * Library of Mathematics, developed at the Computer Science
 * Department, University of Bologna, Italy.
 * 
 * HELM is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * HELM is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HELM; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA  02111-1307, USA.
 * 
 * For details, see the HELM World-Wide-Web page,
 * http://helm.cs.unibo.it/
 *)

open MatitaCicMisc

let init_metadata _ = ()
let compute_metadata _ _ = ()

(*
let init_metadata status =
  let ((_, metasenv, _, _) as proof, _) = status in
  let proof_object_metadata = (* compute proof annotations *)
    Cic2acic.acic_object_of_cic_object (cicCurrentProof proof)
  in
  let sequents_metadata = (* compute all sequent annotations from scratch *)
    List.map
      (fun ((metano, context, term) as sequent) ->
        (metano, Cic2acic.asequent_of_sequent metasenv sequent))
      metasenv
  in
  (proof_object_metadata, sequents_metadata)

let compute_metadata (old_status, old_metadata) new_status =
  let ((_, new_metasenv, _, _) as new_proof, goal_opt) = new_status in
  let proof_object_metadata = (* compute proof annotations *)
    let obj =
      match goal_opt with
      | Some _ -> cicCurrentProof new_proof
      | None -> cicConstant new_proof
    in
    Cic2acic.acic_object_of_cic_object obj
  in
  let sequents_metadata = (* compute all sequent annotations from scratch *)
    (** TODO Zack could we reuse some of the annotations from the previous
    * status to avoid recomputing all of them? uhm ... we have to which
    * sequents haven't been changed by last tactic applications ... doh! *)
    List.map
      (fun ((metano, context, term) as sequent) ->
        (metano, Cic2acic.asequent_of_sequent new_metasenv sequent))
      new_metasenv
  in
  (proof_object_metadata, sequents_metadata)
*)

class proof ?uri ~typ ~metasenv ~body () =
  object (self)

    inherit [unit]
      StatefulProofEngine.status
        ~history_size:BuildTimeConf.undo_history_size ?uri ~typ ~body ~metasenv
        init_metadata compute_metadata ()

    method toXml =
      let currentproof = cicCurrentProof self#proof in
      let (acurrentproof,_,_,ids_to_inner_sorts,_,_,_) =
        Cic2acic.acic_object_of_cic_object ~eta_fix:false currentproof
      in
      let uri = MatitaTypes.unopt_uri self#uri in
      let xml, bodyxml =
        match Cic2Xml.print_object uri ~ids_to_inner_sorts
          ~ask_dtd_to_the_getter:true acurrentproof
        with
        | xml, Some bodyxml -> xml, bodyxml
        | _, None -> assert false
      in
      (xml, bodyxml)

    method toString =
      let (xml, bodyxml) = self#toXml in
      let buf = Buffer.create 10240 in
      List.iter (Buffer.add_string buf)
        [ "<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>\n";
          "<!DOCTYPE ConstantType SYSTEM \"http://mowgli.cs.unibo.it:58081/getdtd?uri=cic.dtd\">\n";
          "<ProofStatus>\n";
          (Misc.strip_xml_headings (Xml.pp_to_string xml));
          (Misc.strip_xml_headings(Xml.pp_to_string bodyxml));
          (if not (self#proof_completed) then
            Printf.sprintf "<CurrentGoal>%d</CurrentGoal>" self#goal
          else
            "<CurrentGoal />");
          "\n</ProofStatus>"
        ];
      Buffer.contents buf

  end

let proof ?uri ~metasenv ~typ () =
  let metasenv = (1, [], typ) :: metasenv in
  let body = Cic.Meta (1,[]) in
  let _  = CicTypeChecker.type_of_aux' metasenv [] typ in
  new proof ~typ ~metasenv ~body ?uri ()