/*  Copyright Mihai Bazon, 2002, 2003  |  http://dynarch.com/mishoo/
 * ---------------------------------------------------------------------------
 *
 * The DHTML Calendar
 *
 * Details and latest version at:
 * http://dynarch.com/mishoo/calendar.epl
 *
 * This script is distributed under the GNU Lesser General Public License.
 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
 *
 * 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.  This script should not be seen as part of the calendar.  It just
 * shows you what one can do with the calendar, while in the same time
 * providing a quick and simple method for setting it up.  If you need
 * exhaustive customization of the calendar creation process feel free to
 * modify this code to suit your needs (this is recommended and much better
 * than modifying calendar.js itself).
 */

// $Id: calendar-setup.js,v 1.7 2003/11/03 05:54:09 mishoo 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: true)
 *   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
 *   onSelect      | function that gets called when a date is selected.  You don't _have_ to supply this (the default is generally okay)
 *   onClose       | function that gets called when the calendar is closed.  [default]
 *   onUpdate      | function that gets called after the date is updated in the input field.  Receives a reference to the calendar.
 *   date          | the date that the calendar will be initially displayed to
 *   showsTime     | default: false; if true the calendar will include a time selector
 *   timeFormat    | the time format; can be "12" or "24", default is "12"
 *
 *  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/%m/%d");
       param_default("daFormat",       "%Y/%m/%d");
       param_default("singleClick",    true);
       param_default("disableFunc",    null);
       param_default("dateStatusFunc", params["disableFunc"]);       // takes precedence if both are defined
       param_default("mondayFirst",    true);
       param_default("align",          "Bl");
       param_default("range",          [1900, 2999]);
       param_default("weekNumbers",    true);
       param_default("flat",           null);
       param_default("flatCallback",   null);
       param_default("onSelect",       null);
       param_default("onClose",        null);
       param_default("onUpdate",       null);
       param_default("date",           null);
       param_default("showsTime",      false);
       param_default("timeFormat",     "24");

       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);
              }
              if (cal.params.displayArea) {
                     cal.params.displayArea.innerHTML = cal.date.print(cal.params.daFormat);
              }
              if (cal.params.singleClick && cal.dateClicked) {
                     cal.callCloseHandler();
              }
              if (typeof cal.params.onUpdate == "function") {
                     cal.params.onUpdate(cal);
              }
       };

       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, params.date, params.onSelect || onSelect);
              cal.showsTime = params.showsTime;
              cal.time24 = (params.timeFormat == "24");
              cal.params = params;
              cal.weekNumbers = params.weekNumbers;
              cal.setRange(params.range[0], params.range[1]);
              cal.setDateStatusHandler(params.dateStatusFunc);
              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;
              var cal = window.calendar;
              if (!window.calendar) {
                     window.calendar = cal = new Calendar(params.mondayFirst,
                                                      params.date,
                                                      params.onSelect || onSelect,
                                                      params.onClose || function(cal) { cal.hide(); });
                     cal.showsTime = params.showsTime;
                     cal.time24 = (params.timeFormat == "24");
                     cal.weekNumbers = params.weekNumbers;
                     mustCreate = true;
              } else {
                     cal.hide();
              }
              cal.setRange(params.range[0], params.range[1]);
              cal.params = params;
              cal.setDateStatusHandler(params.dateStatusFunc);
              cal.setDateFormat(dateFmt);
              if (mustCreate)
                     cal.create();
              cal.parseDate(dateEl.value || dateEl.innerHTML);
              cal.refresh();
              cal.showAtElement(params.displayArea || params.inputField, params.align);
              return false;
       };
};
