(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: delete_user.ml,v 1.4 2004/10/30 10:16:10 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_ok

let run r (q : cgi) (dbh : Dbi.connection) hostid {hostname = hostname} self =
  if q#param_true "cancel" then (
    (* Request cancelled. *)
    q#redirect ("http://" ^ hostname ^ "/_users");
    return ()
  );

  let userid = int_of_string (q#param "userid") in

  (* Check userid belongs to host.  The statements below wouldn't
   * enforce this correctly ...
   *)
  let sth =
    dbh#prepare_cached "select 1 from users where id = ? and hostid = ?" in
  sth#execute [`Int userid; `Int hostid];

  assert (sth#fetch1int () = 1);

  (* Can't delete self! *)
  let () =
    match self with
      | User (id, _, _, _) when id = userid ->
	  error ~back_button:true ~title:"Delete own account"
	    q "You cannot delete your own user account.";
	  return ()
      | _ -> () in

  (* Delete the user. *)
  let sth =
    dbh#prepare_cached "delete from recently_visited
                         where userid = ? and hostid = ?" in
  sth#execute [`Int userid; `Int hostid];

  let sth =
    dbh#prepare_cached "delete from pending_email_changes
                         where userid = ?" in
  sth#execute [`Int userid];


  let sth = dbh#prepare_cached "delete from usercookies where userid = ?" in
  sth#execute [`Int userid];

  let sth = dbh#prepare_cached "update pages set logged_user = null
                                 where logged_user = ? and hostid = ?" in
  sth#execute [`Int userid; `Int hostid];

  let sth =
    dbh#prepare_cached "delete from users where id = ? and hostid = ?" in
  sth#execute [`Int userid; `Int hostid];

  dbh#commit ();

  ok ~title:"Account deleted" ~buttons:[ok_button "/_users"]
    q "That user account was deleted."

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