(* Copyright (C) 2002, 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://cs.unibo.it/helm/.
 *)

(* $Id$ *)

 let debug = false
 let debug_print s = if debug then prerr_endline (Lazy.force s)

(* let debug_print = fun _ -> () *)

let bool params name default =
    try 
      let s = List.assoc name params in 
      if s = "" || s = "1" || s = "true" || s = "yes" || s = "on" then true
      else if s = "0" || s = "false" || s = "no" || s= "off" then false
      else 
        let msg = "Unrecognized value for parameter "^name^"\n" in
        let msg = msg^"Accepted values are 1,true,yes,on and 0,false,no,off" in
        raise (ProofEngineTypes.Fail (lazy msg))
    with Not_found -> default
;; 

let string params name default =
    try List.assoc name params with
    | Not_found -> default
;; 

let int params name default =
    try int_of_string (List.assoc name params) with
    | Not_found -> default
    | Failure _ -> 
        raise (ProofEngineTypes.Fail (lazy (name ^ " must be an integer")))
;;  

let auto_tac ~params ~(dbd:HMysql.dbd) (proof, goal) =
  (* argument parsing *)
  let int = int params 
  and string = string params 
  and bool = bool params in
  let depth = int "depth" ((AutoTypes.default_flags()).AutoTypes.maxdepth) in
  let width = int "width" ((AutoTypes.default_flags()).AutoTypes.maxwidth) in
  let timeout = int "timeout" 0 in
  let use_paramod = bool "use_paramod" true in
  let use_only_paramod = bool "paramodulation" false in
  (* hacks to debug paramod *)
  let superposition = bool "superposition" false in
  let target = string "target" "" in
  let table = string "table" "" in
  let subterms_only = bool "subterms_only" false in
  let demod_table = string "demod_table" "" in
  match superposition with
  | true -> 
      (* this is the ugly hack to debug paramod *)
      Saturation.superposition_tac 
        ~target ~table ~subterms_only ~demod_table (proof,goal)
  | false -> 
      (* this is the real auto *)
      let _, metasenv, _, _ = proof in
      let _, context, goalty = CicUtil.lookup_meta goal metasenv in
      let cache = 
        let cache = 
          AutoCache.cache_add_context context metasenv AutoCache.cache_empty 
        in
        if use_only_paramod then (* only paramod *)
          cache
        else
          AutoCache.cache_add_library dbd proof [goal] cache
      in 
      let oldmetasenv = metasenv in
      let flags = {
        AutoTypes.maxdepth = 
          if use_only_paramod then 2 else depth;
        AutoTypes.maxwidth = width;
        AutoTypes.timeout = 
          if timeout = 0 then float_of_int timeout 
          else Unix.gettimeofday() +. (float_of_int timeout); 
        AutoTypes.use_paramod = use_paramod;
        AutoTypes.use_only_paramod = use_only_paramod;
        AutoTypes.dont_cache_failures = false
      }
      in
      match Auto.auto dbd cache context metasenv [goal] flags with
      | None,cache -> 
          raise (ProofEngineTypes.Fail (lazy "Auto gave up"))
      | Some (subst,metasenv),cache -> 
          let proof,metasenv = 
            ProofEngineHelpers.subst_meta_and_metasenv_in_proof
              proof goal (CicMetaSubst.apply_subst subst) metasenv
          in
          let opened = 
            ProofEngineHelpers.compare_metasenvs ~oldmetasenv
              ~newmetasenv:metasenv
          in
          proof,opened
;;

let auto_tac ~params ~dbd =
      ProofEngineTypes.mk_tactic (auto_tac ~params ~dbd)
;;

let pp_proofterm = Equality.pp_proofterm;;