(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: user_prefs.ml,v 1.9 2006/07/31 09:49:43 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
open Cocanwiki_template
open Cocanwiki_strings

let run r (q : cgi) dbh hostid {hostname=hostname} user =
  let email_change_template = _get_template "user_prefs_email_change.txt" in

  (* Get the fields. *)
  let new_email = trim (q#param "email") in
  let email_notify = q#param_true "email_notify" in

  let userid =
    match user with
	Anonymous -> assert false
      | User (userid, _, _, _) -> userid in

  (* Update the preferences fields. *)
  PGSQL(dbh)
    "update users set email_notify = $email_notify
      where hostid = $hostid and id = $userid";

  (* Have we changed the email address? *)
  let confirm_needed =
    if new_email = "" then (
      (* Set the email field in the database to null.  No need for
       * any confirmation.
       *)
      PGSQL(dbh) "update users set email = null
                   where hostid = $hostid and id = $userid";

      false
    ) else (
      (* Is the new email address different from the one currently recorded
       * in the database?
       *)
      let changed = Option.get (
	List.hd (
	  PGSQL(dbh) "select $new_email <> coalesce (email, '')
                        from users where hostid = $hostid and id = $userid"
	)
      ) in

      if changed then (
	let key = random_sessionid () in
	(* Changed, so we add to the pending_email_changes table. *)
	PGSQL(dbh) "insert into pending_email_changes
                      (key, userid, email)
                    values ($key, $userid, $new_email)";

	(* Send the confirm email. *)
	email_change_template#set "hostname" hostname;
	email_change_template#set "key" key;
	let body = email_change_template#to_string in

	let subject = "Please verify your new email address at " ^ hostname in

	let content_type =
	  "text/plain", ["charset", Mimestring.mk_param "UTF-8"] in
	let to_addrs = [ "", new_email ] in

	let msg = Netsendmail.compose ~subject ~to_addrs ~content_type body in
	Netsendmail.sendmail msg
      );

      changed
    ) in

  (* Good place to remove old rows in the pending_email_changes table. *)
  PGSQL(dbh) "delete from pending_email_changes
               where change_date - current_date > 7";

  (* Commit and finish off. *)
  PGOCaml.commit dbh;

  let buttons = [ ok_button "/_userprefs" ] in
  ok ~title:"Preferences updated" ~buttons
    dbh hostid q
    ("Your user preferences were updated.  " ^
       if confirm_needed then
	 ("Because you changed your email address, we have sent a " ^
	  "confirmation email to your new address.  You will need to " ^
	  "click on the link in that email to verify your new address.")
       else
	 "")

let () =
  register_script ~anonymous:false run