(* COCANWIKI - a wiki written in Objective CAML.
 * Written by Richard W.M. Jones <rich@merjis.com>.
 * Copyright (C) 2004 Merjis Ltd.
 * $Id: pagestyle.ml,v 1.4 2004/09/09 12:21:22 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

let run r (q : cgi) (dbh : Dbi.connection) hostid _ _ =
  let page = q#param "page" in
  let version =
    try Some (int_of_string (q#param "version")) with Not_found -> None in

  (* Get the CSS. *)
  let sth =
    match version with
	None ->
	  let sth = dbh#prepare_cached
		      "select css from pages where hostid = ? and url = ?" in
	  sth#execute [`Int hostid; `String page];
	  sth
      | Some version ->
	  let sth = dbh#prepare_cached
		      "select css from pages
                        where hostid = ? and id = ? and
                              (url = ? or url_deleted = ?)" in
	  sth#execute [`Int hostid; `Int version; `String page; `String page];
	  sth in
  let css =
    match sth#fetch1 () with
	[ `Null ] -> ""
      | [ `String css ] -> css
      | _ -> assert false in

  (* It's crucial, for speed of page delivery and rendering, to have
   * an expires header for CSS.  Even though this means that occasionally
   * people will need to hit [Shift]+Reload, I'm going to set a
   * medium-length expiry time on this resource.
   *)
  Table.set (Request.headers_out r) "Expires" (Cgi_expires.expires_medium ());

  q#header ~content_type:"text/css" ();
  print_string r css

let () =
  register_script run