// Title: Tigra Calendar
// URL: http://www.softcomplex.com/products/tigra_calendar/
// Version: 3.3 (American date format)
// Date: 09/01/2005 (mm/dd/yyyy)
// Note: Permission given to use this script in ANY kind of applications if
//    header lines are left unchanged.
// Note: Script consists of two files: calendar?.js and calendar.html

// if two digit year input dates after this year considered 20 century.
var NUM_CENTYEAR = 30;
// are year scrolling buttons required by default
var B_YEARSCROLL = true;

var calendars = [];
var RE_NUM = /^\-?\d+$/;

function calendar(obj_target) {

  // assigning methods
  this.gen_date = cal_gen_date1;
  this.prs_date = cal_prs_date1;
  this.prs_tsmp = cal_prs_tsmp1;
  this.popup    = cal_popup1;

  // validate input parameters
  if (!obj_target)
    return cal_error("Error calling the calendar: no target control specified");
  if (obj_target.value == null)
    return cal_error("Error calling the calendar: parameter specified is not valid target control");
  this.target = obj_target;
    // set defaults
  this.year_scroll = B_YEARSCROLL;

  // register in global collections
  this.id = calendars.length;
  calendars[this.id] = this;
}

function cal_popup1 (str_datetime) {
  if (str_datetime) {
    this.dt_current = this.prs_tsmp(str_datetime);
  }
  else {
    this.dt_current = this.prs_tsmp(this.target.value);
    this.dt_selected = this.dt_current;
  }
  if (!this.dt_current) return;

  var path='static/js/calendar/calendar.html';
  if( this.popwin && this.popwin.document ) {
    // use absolute path to avoid relative path confusions
    path = this.popwin.document.location.pathname;
  }
  var obj_calwindow = window.open(
    path+'?datetime=' + this.dt_current.valueOf()+ '&id=' + this.id,
    'Calendar', 'width=200,height=190,status=no,resizable=no,top=200,left=200,dependent=yes,alwaysRaised=yes'
  );
  this.popwin = obj_calwindow;
  obj_calwindow.opener = window;
  obj_calwindow.focus();
}

// date generating function
function cal_gen_date1 (dt_datetime) {
  return (
    (dt_datetime.getMonth() < 9 ? '0' : '') + (dt_datetime.getMonth() + 1) + "/"
    + (dt_datetime.getDate() < 10 ? '0' : '') + dt_datetime.getDate() + "/"
    + dt_datetime.getFullYear()
  );
}


// timestamp parsing function
function cal_prs_tsmp1 (str_datetime) {
  // if no parameter specified return current timestamp
  if (!str_datetime)
    return (new Date());

  // if positive integer treat as milliseconds from epoch
  if (RE_NUM.exec(str_datetime))
    return new Date(str_datetime);

  // else treat as date in string format
  //var arr_datetime = str_datetime.split(' ');
  //return this.prs_time(arr_datetime[1], this.prs_date(arr_datetime[0]));
    return this.prs_date(str_datetime);
}

// date parsing function
function cal_prs_date1 (str_date) {

  var arr_date = str_date.split('/');

  if (arr_date.length != 3) return alert ("Invalid date format: '" + str_date + "'.\nPlease format the date like this: 01/31/2006.");
  if (!arr_date[1]) return alert ("Invalid date format: '" + str_date + "'.\nNo day of month value can be found.");
  if (!RE_NUM.exec(arr_date[1])) return alert ("Invalid day of month value: '" + arr_date[1] + "'.\nPlease format the date like this: 01/31/2006.");
  if (!arr_date[0]) return alert ("Invalid date format: '" + str_date + "'.\nNo month value can be found.");
  if (!RE_NUM.exec(arr_date[0])) return alert ("Invalid month value: '" + arr_date[0] + "'.\nPlease format the date like this: 01/31/2006.");
  if (!arr_date[2]) return alert ("Invalid date format: '" + str_date + "'.\nNo year value can be found.");
  if (!RE_NUM.exec(arr_date[2])) return alert ("Invalid year value: '" + arr_date[2] + "'.\nPlease format the date like this: 01/31/2006.");

  var dt_date = new Date();
  dt_date.setDate(1);

  if (arr_date[0] < 1 || arr_date[0] > 12) return alert ("Invalid month value: '" + arr_date[0] + "'.\nAllowed range is 01-12.");
  dt_date.setMonth(arr_date[0]-1);

  if (arr_date[2] < 100) arr_date[2] = Number(arr_date[2]) + (arr_date[2] < NUM_CENTYEAR ? 2000 : 1900);
  dt_date.setFullYear(arr_date[2]);

  var dt_numdays = new Date(arr_date[2], arr_date[0], 0);
  dt_date.setDate(arr_date[1]);
  if (dt_date.getMonth() != (arr_date[0]-1)) return alert ("Invalid day of month value: '" + arr_date[1] + "'.\nAllowed range is 01-"+dt_numdays.getDate()+".");

  return (dt_date)
}

function cal_error (str_message) {
  alert (str_message);
  return null;
}