(* 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 1.1 2004/10/14 15:57:15 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 : Dbi.connection) 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 ^ "/");
    return ()
  );

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

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

  (* Get user's own email address, which will be the return address
   * for the email.
   *)
  let sth = dbh#prepare_cached "select email from users
                                 where hostid = ? and id = ?" in
  sth#execute [`Int hostid; `Int userid];

  let from =
    match sth#fetch1 () with
	[ `String email ] -> email
      | [ `Null ] -> "service@merjis.com"
      | _ -> assert false in

  (* Add user accounts for these new users.  For users who are already
   * registered, we'll send reminder emails.
   *)
  List.iter
    (fun email ->
       let sth = dbh#prepare_cached "select id from users
                                      where hostid = ? and
                                            (email = ? or name = ?)" in
       sth#execute [`Int hostid; `String email; `String email];

       let userid = try Some (sth#fetch1int ()) with Not_found -> None in

       let body =
	 match userid with
	     Some userid ->
	       (* Existing user account - send reminder. *)
	       template_exists#set "username" username;
	       template_exists#set "hostname" hostname;
	       template_exists#to_string

	   | None ->
	       (* Add user account. *)
	       let password = random_sessionid () in
	       let sth = dbh#prepare_cached "insert into users (hostid, name,
                 password, email) values (?, ?, ?, ?)" in
	       sth#execute [`Int hostid; `String email; `String password;
			    `String email];

	       template#set "username" username;
	       template#set "hostname" hostname;
	       template#set "password" password;
	       template#to_string in

       (* Send the email. *)
       Sendmail.send_mail ~subject ~to_addr:[email] ~from ~body ()
    ) emails;

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

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

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