(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: cocanwiki_emailnotify.ml,v 1.7 2006/03/27 16:43:44 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 ExtList

open Cocanwiki

(* This is where we coordinate email notification from various
 * scripts which create or update the wiki.
 *)
let email_notify ~subject ~body ?user dbh hostid =
  (* Get own userid, if we have it.  Don't want to send email
   * notification back to the person who changed the page.  If
   * we don't have a userid, set it to 0, because no real user can
   * have userid = 0.
   *
   * Also get the user's email address.
   *)
  let own_userid, from =
    match user with
      | None
      | Some Anonymous -> 0l, None
      | Some (User (userid, _, _, prefs)) -> userid, prefs.email in

  (* Send a change email to everyone who hasn't opted out using
   * their preferences.  This behaviour replaces the old
   * 'email_notify' table.  Don't send email to invited accounts
   * who have not yet confirmed.
   *)
  let rows = PGSQL(dbh)
    "select name, email
       from users
      where hostid = $hostid and id <> $own_userid and email_notify
        and email is not null and invite is null" in
  let to_addr = List.filter_map (
    function
    | (name, Some email) ->
	Some ("\"" ^ name ^ "\" <" ^ email ^ ">")
    | (name, None) -> None
  ) rows in

  if to_addr <> [] then (
    (* Prepare the body of the message.  The assumption is that
     * this takes time and database access, so we defer the creation
     * of the body until we know that someone needs to be notified.
     *)
    let body = body () in

    let subject = "Site notice: " ^ subject in

    (* Send the email. *)
    Sendmail.send_mail ~subject ~to_addr ?from body
  )