(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: undelete_file.ml,v 1.9 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

let run r (q : cgi) dbh hostid { hostname = hostname } _ =
  let id = Int32.of_string (q#param "id") in

  if q#param_true "yes" then (
    (* Get the name of the file. *)
    let name = Option.get (
      List.hd (
	PGSQL(dbh)
	  "select name_deleted from files
            where hostid = $hostid and id = $id"
      )
    ) in

    (* First delete any more recent versions of this file. *)
    PGSQL(dbh) "update files
                   set name_deleted = name, name = null
                 where hostid = $hostid and name = $name";

    (* Now copy the old row, changing name_deleted back to name so the file
     * becomes live.
     *)
    PGSQL(dbh) "insert into files
                  (hostid, name, content, title, mime_type, upload_date)
                select hostid, name_deleted, content,
                       title, mime_type, upload_date
                  from files
                 where hostid = $hostid and id = $id";

    PGOCaml.commit dbh;

    (* Done. *)
    let buttons = [ ok_button "/_files" ] in
    ok ~title:"File restored" ~buttons
      dbh hostid q "File was restored successfully."
  ) else
    q#redirect ("http://" ^ hostname ^ "/_files")

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