(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: edit_page_css.ml,v 1.24 2006/08/17 09:11:31 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_diff
open Cocanwiki_emailnotify
open Cocanwiki_strings

let run r (q : cgi) dbh hostid {hostname = hostname} user =
  let page = q#param "page" in
  let css = q#param "css" in

  let css = if string_is_whitespace css then None else Some css in

  (* Get the IP address of the user, if available. *)
  let logged_ip =
    try Some (Connection.remote_ip (Request.connection r))
    with Not_found -> None in

  let logged_user =
    match user with
      | User (id, _, _, _) -> Some id
      | _ -> None in

  (* Changing the CSS creates a new version of the page.  This enables
   * us to revert changes to the CSS easily.
   *)
  let rows = PGSQL(dbh)
    "select id, title, description, keywords, noodp, creation_date, redirect
       from pages
      where hostid = $hostid and url = $page" in

  let oldpageid, title, description, keywords, noodp, creation_date, redirect =
    match rows with
    | [row] -> row
    | _ -> assert false in

  PGSQL(dbh)
    "set constraints pages_redirect_cn, sitemenu_url_cn,
       page_emails_url_cn, links_from_cn, recently_visited_url_cn
     deferred";

  PGSQL(dbh) "update pages set url_deleted = url, url = null
               where hostid = $hostid and id = $oldpageid";

  PGSQL(dbh) "insert into pages (hostid, url, title,
                                 description, keywords, noodp,
                                 creation_date, logged_ip,
                                 logged_user, redirect, css)
              values ($hostid, $page, $title, $description, $?keywords,
                      $?noodp,
                      $creation_date, $?logged_ip, $?logged_user,
                      $?redirect, $?css)";

  let pageid = PGOCaml.serial4 dbh "pages_id_seq" in

  PGSQL(dbh) "insert into contents (pageid, ordering,
                                    sectionname, content, divname, divclass,
                                    jsgo)
              select $pageid as pageid, ordering, sectionname,
                     content, divname, divclass, jsgo
                from contents
               where pageid = $oldpageid";

  PGOCaml.commit dbh;

  (* Email notification. *)
  let subject = "CSS for page " ^ page ^ " has been modified" in
  let body = fun () ->
    let diff, _ =
      get_diff dbh hostid page ~version:pageid ~old_version:oldpageid () in
    "Page: http://" ^ hostname ^ "/" ^ page ^ "\n\n" ^
    diff in

  email_notify ~subject ~body ~user dbh hostid;

  let buttons = [ ok_button ("/" ^ page);
		  { Template.StdPages.label = "Edit stylesheet again";
		    Template.StdPages.link = "/_bin/edit_page_css_form.cmo";
		    Template.StdPages.method_ = None;
		    Template.StdPages.params = [ "page", page ] } ] in
  ok ~title:"Stylesheet changed" ~buttons
    dbh hostid q
    ("The stylesheet was changed successfully.  " ^
     "Note: You must RELOAD the page to see changes to stylesheets.")

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