/*  Copyright Mihai Bazon, 2002, 2003  |  http://students.infoiasi.ro/~mishoo
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar
 *
 * Details and latest version at:
 * http://students.infoiasi.ro/~mishoo/site/calendar.epl
 *
 * Feel free to use this script under the terms of the GNU Lesser General
 * Public License, as long as you do not remove or alter this notice.
 *
 * This file defines helper functions for setting up the calendar.  They are
 * intended to help non-programmers get a working calendar on their site
 * quickly.
 */

// $Id: calendar-setup.js,v 1.1 2004/08/20 04:22:56 kaer Exp $

/**
 *  This function "patches" an input field (or other element) to use a calendar
 *  widget for date selection.
 *
 *  The "params" is a single object that can have the following properties:
 *
 *    prop. name   | description
 *  -------------------------------------------------------------------------------------------------
 *   inputField    | the ID of an input field to store the date
 *   displayArea   | the ID of a DIV or other element to show the date
 *   button        | ID of a button or other element that will trigger the calendar
 *   eventName     | event that will trigger the calendar, without the "on" prefix (default: "click")
 *   ifFormat      | date format that will be stored in the input field
 *   daFormat      | the date format that will be used to display the date in displayArea
 *   singleClick   | (true/false) wether the calendar is in single click mode or not (default: true)
 *   mondayFirst   | (true/false) if true Monday is the first day of week, Sunday otherwise (default: false)
 *   align         | alignment (default: "Bl"); if you don't know what's this see the calendar documentation
 *   range         | array with 2 elements.  Default: [1900, 2999] -- the range of years available
 *   weekNumbers   | (true/false) if it's true (default) the calendar will display week numbers
 *   flat          | null or element ID; if not null the calendar will be a flat calendar having the parent with the given ID
 *   flatCallback  | function that receives a JS Date object and returns an URL to point the browser to (for flat calendar)
 *   disableFunc   | function that receives a JS Date object and should return true if that date has to be disabled in the calendar
 *
 *  None of them is required, they all have default values.  However, if you
 *  pass none of "inputField", "displayArea" or "button" you'll get a warning
 *  saying "nothing to setup".
 */
Calendar.setup = function (params) {
  function param_default(pname, def) { if (typeof params[pname] == "undefined") { params[pname] = def; } };

  param_default("inputField",    null);
  param_default("displayArea",   null);
  param_default("button",        null);
  param_default("eventName",     "click");
  param_default("ifFormat",      "y/mm/dd");
  param_default("daFormat",      "y/mm/dd");
  param_default("singleClick",   true);
  param_default("disableFunc",   null);
  param_default("mondayFirst",   false);
  param_default("align",         "Bl");
  param_default("range",         [1900, 2999]);
  param_default("weekNumbers",   true);
  param_default("flat",          null);
  param_default("flatCallback",  null);

  var tmp = ["inputField", "displayArea", "button"];
  for (var i in tmp) {
    if (typeof params[tmp[i]] == "string") {
      params[tmp[i]] = document.getElementById(params[tmp[i]]);
    }
  }
  if (!(params.flat || params.inputField || params.displayArea || params.button)) {
    alert("Calendar.setup:\n  Nothing to setup (no fields found).  Please check your code");
    return false;
  }

  function onSelect(cal) {
    if (cal.params.flat) {
      if (typeof cal.params.flatCallback == "function") {
        cal.params.flatCallback(cal);
      } else {
        alert("No flatCallback given -- doing nothing.");
      }
      return false;
    }
    if (cal.params.inputField) {
      cal.params.inputField.value = cal.date.print(cal.params.ifFormat);
	  //added by chetan
	  cal.params.inputField.focus();
	   //end portion added by chetan
    }
    if (cal.params.displayArea) {
      cal.params.displayArea.innerHTML = cal.date.print(cal.params.daFormat);
    }
    if (cal.params.singleClick && cal.dateClicked) {
      cal.callCloseHandler();
    }
  };

  if (params.flat != null) {
    params.flat = document.getElementById(params.flat);
    if (!params.flat) {
      alert("Calendar.setup:\n  Flat specified but can't find parent.");
      return false;
    }
    var cal = new Calendar(params.mondayFirst, null, onSelect);
    cal.params = params;
    cal.weekNumbers = params.weekNumbers;
    cal.setRange(params.range[0], params.range[1]);
    cal.setDisabledHandler(params.disableFunc);
    cal.create(params.flat);
    cal.show();
    return false;
  }

  var triggerEl = params.button || params.displayArea || params.inputField;
  triggerEl["on" + params.eventName] = function() {
    var dateEl = params.inputField || params.displayArea;
    var dateFmt = params.inputField ? params.ifFormat : params.daFormat;
    var mustCreate = false;
    if (!window.calendar) {
      window.calendar = new Calendar(params.mondayFirst, null, onSelect, function(cal) { cal.hide(); });
      window.calendar.weekNumbers = params.weekNumbers;
      mustCreate = true;
    } else {
      window.calendar.hide();
    }
    window.calendar.setRange(params.range[0], params.range[1]);
    window.calendar.params = params;
    window.calendar.setDisabledHandler(params.disableFunc);
    window.calendar.setDateFormat(dateFmt);
    if (mustCreate) {
      window.calendar.create();
    }
    window.calendar.parseDate(dateEl.value || dateEl.innerHTML);
    window.calendar.refresh();
    window.calendar.showAtElement(params.displayArea || params.inputField, params.align);
    return false;
  };
};