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

let split_re = Pcre.regexp "[\\s,;]+"

let run r (q : cgi) dbh hostid {hostname = hostname} user =
  let template = _get_template "invite_user.txt" in
  let template_exists = _get_template "invite_user_exists.txt" in

  (* Get the email addresses. *)
  let emails = q#param "emails" in
  let emails = Pcre.split ~rex:split_re emails in

  (* This guy's got no friends ... *)
  if emails = [] then
    q#redirect ("http://" ^ hostname ^ "/");

  let userid, username, email = match user with
      User (userid, username, _, prefs) -> userid, username, prefs.email
    | _ -> assert false in

  let subject = username ^ " has invited you to join " ^ hostname in

  (* Get a suitable return address for the email. *)
  let from_addr =
    match email with
      | Some email -> username, email
      | None -> username, "service@merjis.com" in

  (* Add user accounts for these new users.  For users who are already
   * registered, we'll send reminder emails.
   *)
  List.iter
    (fun email ->
       let rows = PGSQL(dbh) "select id, invite from users
                               where hostid = $hostid and
                               (email = $email or name = $email)" in

       let body =
	 match rows with
	 | [ userid, None ] ->
	     (* Existing user account - send reminder. *)
	     template_exists#set "username" username;
	     template_exists#set "hostname" hostname;
	     template_exists#to_string

	 | [ userid, Some invite ] ->
	     (* Existing user account - resend the invite. *)
	     template#set "username" username;
	     template#set "hostname" hostname;
	     template#set "invite" invite;
	     template#to_string

	 | [] ->
	     (* Add user account. *)
	     let invite = random_sessionid () in
	     PGSQL(dbh)
	       "insert into users (hostid, name,
                  password, email, invite) values ($hostid, $email, $invite,
                  $email, $invite)";

	     template#set "username" username;
	     template#set "hostname" hostname;
	     template#set "invite" invite;
	     template#to_string

	 | _ -> assert false in

       (* Send the email. *)
       let to_addrs = [ "", email ] in
       let content_type =
	 "text/plain", ["charset", Mimestring.mk_param "UTF-8"] in

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

  (* Finish off. *)
  PGOCaml.commit dbh;

  let buttons = [ ok_button "/_users" ] in
  ok ~buttons ~title:"Invitation emails sent"
    dbh hostid q "We sent invitations emails to those address(es)."

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