(*
 * <COPYRIGHT>
 * Copyright 2003 Gerd Stolpmann
 *
 * <GPL>
 * This file is part of WTimer.
 *
 * WTimer 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.
 *
 * WTimer 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 WDialog; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * </>
 *)

(* $Id: timetravel.ml,v 1.5 2003/03/23 11:59:14 gerd Exp $
 * ----------------------------------------------------------------------
 *
 *)

open Wd_dialog
open Wd_run_cgi
open Wd_types

open Db_types.Types
open Db_types
open Definitions

class timetravel db universe name env =
object (self)
  inherit dialog universe name env
  inherit error_behaviour
    
  method private check_auth () =
    check_auth db (self # dialog_variable "session")

  method private add_message m =
    let msgs = self # enum_variable "message" in
    self # set_variable "message" (Enum_value(m :: msgs));

  method private try_prepare_page() = ()

  method private try_handle() =
    (* Before anything else happens, parse the input boxes: *)
    self # set_variable "message" (Enum_value []);
    let entered_year = self # string_variable "entered_year" in
    ( try
	let year = int_of_string entered_year in
	if year < 1902 || year > 2037 then failwith "Year out of range";
	self # set_variable "year" (String_value(string_of_int year));
      with
	  Failure _ ->
	    self # add_message "error-bad-year";
	    raise(Change_page self#page_name);
    );
    (* Check whether a file menu button has been pressed: *)
    try
      raise(Change_dialog(Filemenu.handle (self :> dialog_type) db self#event))
    with
	Filemenu.Not_competent ->
	  (* No: Perhaps a timewarp *)
	  ( match self#event with
		Indexed_button("calendary-month",new_date) ->
		  let session = self # dialog_variable "session" in
		  self # set_variable "session.current-date" 
		    (String_value new_date);
		  let next_dlg = 
		    !Registry.new_editor universe env session in
		  raise(Change_dialog next_dlg)
	      | Button "cont-error" ->
		  self # set_next_page "calendary"
	      | _ -> ()
	  )

end
;;

Registry.new_timetravel := 
  fun universe env opt_session ->
    let dlg = universe # create env "timetravel" in
    dlg # set_variable "session" (Dialog_value opt_session);
    ( match opt_session with
	  Some session ->
	    let date = 
	      Date.from_string (session # string_variable "current-date") in
	    let year =
	      String_value(string_of_int((Date.access date).year)) in
	    dlg # set_variable "year" year;
	    dlg # set_variable "entered_year" year;
	      
	| None -> ()
    );
    dlg
;;

(* ======================================================================
 * History:
 * 
 * $Log: timetravel.ml,v $
 * Revision 1.5  2003/03/23 11:59:14  gerd
 * 	GPL
 *
 * Revision 1.4  2003/02/03 01:28:59  gerd
 * 	Continued.
 *
 * Revision 1.3  2003/01/26 23:45:16  gerd
 * 	Improved error behaviour.
 *
 * Revision 1.2  2003/01/16 00:39:25  gerd
 * 	Continued.
 *
 * Revision 1.1  2002/11/16 12:34:51  gerd
 * 	Initial revision
 *
 * 
 *)