(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: restore_form.ml,v 1.13 2006/03/28 16:24:08 rich Exp $
 *
 * This program 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.
 *
 * This program 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 this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *)

open Apache
open Registry
open Cgi
open Printf

open Cocanwiki
open Cocanwiki_template
open Cocanwiki_ok
open Cocanwiki_diff

let run r (q : cgi) dbh hostid _ user =
  let template = get_template dbh hostid "restore_form.html" in

  (* Parameters. *)
  let page = q#param "page" in
  let old_version = Int32.of_string (q#param "version") in

  template#set "page" page;
  template#set "version" (Int32.to_string old_version);

  (* Compute the diff between the latest version of this page and the
   * page we're wanting to restore.
   *)
  let version = List.hd (
    PGSQL(dbh)
      "select id from pages
        where hostid = $hostid and url = $page"
  ) in

  if version = old_version then (
    error ~back_button:true ~title:"Restoring live version"
      dbh hostid q "You seem to be trying to restore the live version.";
    return ()
  );

  let diff, _ = get_diff dbh hostid page ~old_version ~version () in

  (* Display the diff. *)
  template#set "diff" diff;

  q#template template

let () =
  register_script ~restrict:[CanEdit] run