(* Copyright (C) 2000, 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/.
 *)

(******************************************************************************)
(*                                                                            *)
(*                               PROJECT HELM                                 *)
(*                                                                            *)
(*                Claudio Sacerdoti Coen <sacerdot@cs.unibo.it>               *)
(*                                 24/01/2000                                 *)
(*                                                                            *)
(******************************************************************************)


(*CSC: il getter _DEVE_ diventare un semplice "binding" a quello in Perl *)

let update () =
(* deliver update request to http_getter *)
 ClientHTTP.send (Configuration.getter_url ^ "update")
;;

(* url_of_uri : uri -> url *)
let url_of_uri uri =
 let dbm = Dbm.opendbm Configuration.uris_dbm [Dbm.Dbm_rdonly] 0o660 in
  let url = Dbm.find dbm (UriManager.string_of_uri uri) in
   Dbm.close dbm ;
   url
;;

let filedir_of_uri uri =
 let fn = UriManager.buri_of_uri uri in
  let fn' = Str.replace_first (Str.regexp ".*:") Configuration.dest fn in
   fn'
;;

let name_and_ext_of_uri uri =
 let str = UriManager.string_of_uri uri in
  Str.replace_first (Str.regexp ".*/") "" str
;;

let raw_get = ClientHTTP.get_and_save

(* get_file : uri -> filename *)
let get_file uri =
 let dir = filedir_of_uri uri in
  let fn = dir ^ "/" ^ name_and_ext_of_uri uri ^ ".xml" in
   if not (Sys.file_exists fn) then
    begin
     let url = url_of_uri uri in
      raw_get
       (Configuration.getter_url ^ "getxml?uri=" ^
        UriManager.string_of_uri uri ^ "&format=normal&patch_dtd=no"
       ) fn
    end ;
   fn
;;

(* get : uri -> filename *)
(* If uri is the URI of an annotation, the annotated object is processed *)
let get uri =
 let module U = UriManager in
  get_file
   (U.uri_of_string
    (Str.replace_first (Str.regexp "\.types$") ""
     (Str.replace_first (Str.regexp "\.ann$") "" (U.string_of_uri uri))))
;;

(* get_ann : uri -> filename *)
(* If uri is the URI of an annotation, the annotation file is processed *)
let get_ann = get_file;;

(* get_ann_file_name_and_uri : uri -> filename * annuri *)
(* If given an URI, it returns the name of the corresponding *)
(* annotation file and the annotation uri                    *)
let get_ann_file_name_and_uri uri = 
 let module U = UriManager in
  let uri = U.string_of_uri uri in
   let annuri =
    U.uri_of_string (
     if Str.string_match (Str.regexp ".*\.ann$") uri 0 then
      uri
     else
      uri ^ ".ann"
    )
   in
    let dir = filedir_of_uri annuri in
     let fn = dir ^ "/" ^ name_and_ext_of_uri annuri ^ ".xml" in
      (fn, annuri)
;;