(* Copyright (C) 2004-2005, 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 Printf

  (** user hit the cancel button *)
exception Cancel

  (** statement invoked in the wrong context (e.g. tactic with no ongoing proof)
   *)
exception Statement_error of string
let statement_error msg = raise (Statement_error msg)

exception Command_error of string
let command_error msg = raise (Command_error msg)

  (** parameters are: option name, error message *)
exception Option_error of string * string

exception Unbound_identifier of string

type proof_status =
  | No_proof
  | Incomplete_proof of ProofEngineTypes.status
  | Proof of ProofEngineTypes.proof
  | Intermediate of Cic.metasenv
      (* Status in which the proof could be while it is being processed by the
      * engine. No status entering/exiting the engine could be in it. *)

module StringMap = Map.Make (String)

type option_value =
  | String of string
  | Int of int
type options = option_value StringMap.t
let no_options = StringMap.empty

type status = {
  aliases: DisambiguateTypes.environment;   (** disambiguation aliases *)
  proof_status: proof_status;
  options: options;
  coercions: CoercGraph.coercions;
  objects: (UriManager.uri * string) list;
    (** in-scope objects, with their paths *)
}

let dump_status status = 
  MatitaLog.message "status.aliases:\n";
  MatitaLog.message
  (CicTextualParser2.EnvironmentP3.to_string status.aliases ^ "\n");
  MatitaLog.message "status.proof_status:"; 
  MatitaLog.message
    (match status.proof_status with
    | No_proof -> "no proof\n"
    | Incomplete_proof _ -> "incomplete proof\n"
    | Proof _ -> "proof\n"
    | Intermediate _ -> "Intermediate\n");
  MatitaLog.message "status.options\n";
  StringMap.iter (fun k v -> 
    let v = 
      match v with
      | String s -> s
      | Int i -> string_of_int i
    in
    MatitaLog.message (k ^ "::=" ^ v)) status.options;
  MatitaLog.message "status.coercions\n";
  List.iter 
    (fun (u1,u2,u3) -> MatitaLog.message
     ((UriManager.string_of_uri u1) ^
     (UriManager.string_of_uri u2) ^
     (UriManager.string_of_uri u3))) status.coercions; 
  MatitaLog.message "status.objects:\n";
  List.iter 
    (fun (u,_) -> 
      MatitaLog.message (UriManager.string_of_uri u)) status.objects 
  

let get_option status name =
  try
    StringMap.find name status.options
  with Not_found -> raise (Option_error (name, "not found"))

let get_string_option status name =
  match get_option status name with
  | String s -> s
  | _ -> raise (Option_error (name, "not a string value"))

let set_option status name value =
  let mangle_dir s =
    let s = Str.global_replace (Str.regexp "//+") "/" s in
    let s = Str.global_replace (Str.regexp "/$") "" s in
    s
  in
  let types =
    [ "baseuri", (`String, mangle_dir);
      "basedir", (`String, mangle_dir);
    ]
  in
  let ty_and_mangler =
    try
      List.assoc name types
    with Not_found -> command_error (sprintf "Unknown option \"%s\"" name)
  in
  let value =
    match ty_and_mangler with
    | `String, f -> String (f value)
    | `Int, f ->
        (try
          Int (int_of_string (f value))
        with Failure _ ->
          command_error (sprintf "Not an integer value \"%s\"" value))
  in
  { status with options = StringMap.add name value status.options }

  (* subset of MatitaConsole.console methods needed by MatitaInterpreter *)
class type console =
  object
    method clear : unit -> unit
    method echo_error : string -> unit
    method echo_message : string -> unit
    method wrap_exn : 'a. (unit -> 'a) -> 'a option
    method choose_uri : string list -> string
    method show : ?msg:string -> unit -> unit
  end