// 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;
// is time input control required by default
var BUL_TIMECOMPONENT = false;
// are year scrolling buttons required by default
var BUL_YEARSCROLL = true;

var calendars = [];
var RE_NUM = /^\-?\d+$/;
var m_strLocation = '';
function calendar(obj_target, strLocation) {

   // assigning methods
   this.gen_date = cal_gen_date2;
   this.gen_time = cal_gen_time2;
   this.gen_tsmp = cal_gen_tsmp2;
   this.prs_date = cal_prs_date2;
   this.prs_time = cal_prs_time2;
   this.prs_tsmp = cal_prs_tsmp2;
   this.popup    = cal_popup2;
   
   // 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;
   this.time_comp = BUL_TIMECOMPONENT;
   this.year_scroll = BUL_YEARSCROLL;
   
   // register in global collections
   this.id = calendars.length;
   calendars[this.id] = this;
   m_strLocation = strLocation;
}

function cal_popup2 (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 obj_calwindow = window.open(
                                  m_strLocation + 'calendar.html?datetime=' + this.dt_current.valueOf()+ '&id=' + this.id,
                                  'Calendar', 'width=200,height='+(this.time_comp ? 215 : 190)+
                                  ',status=no,resizable=no,top=400,left=550,dependent=yes,alwaysRaised=yes'
                                  );
   obj_calwindow.opener = window;
   obj_calwindow.focus();
}

// timestamp generating function
function cal_gen_tsmp2 (dt_datetime) {
   return(this.gen_date(dt_datetime) + ' ' + this.gen_time(dt_datetime));
}

// date generating function
function cal_gen_date2 (dt_datetime) {
   return(
         (dt_datetime.getMonth() < 9 ? '0' : '') + (dt_datetime.getMonth() + 1) + "/"
         + (dt_datetime.getDate() < 10 ? '0' : '') + dt_datetime.getDate() + "/"
         + dt_datetime.getFullYear()
         );
}
// time generating function
function cal_gen_time2 (dt_datetime) {
   return(
         (dt_datetime.getHours() < 10 ? '0' : '') + dt_datetime.getHours() + ":"
         + (dt_datetime.getMinutes() < 10 ? '0' : '') + (dt_datetime.getMinutes()) + ":"
         + (dt_datetime.getSeconds() < 10 ? '0' : '') + (dt_datetime.getSeconds())
         );
}

// timestamp parsing function
function cal_prs_tsmp2 (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]));
}

// date parsing function
function cal_prs_date2 (str_date) {

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

   if (arr_date.length != 3) return alert ("Invalid date format: '" + str_date + "'.\nFormat accepted is dd-mm-yyyy.");
   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] + "'.\nAllowed values are unsigned integers.");
   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] + "'.\nAllowed values are unsigned integers.");
   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] + "'.\nAllowed values are unsigned integers.");

   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)
}

// time parsing function
function cal_prs_time2 (str_time, dt_date) {

   if (!dt_date) return null;
   var arr_time = String(str_time ? str_time : '').split(':');

   if (!arr_time[0]) dt_date.setHours(0);
   else if (RE_NUM.exec(arr_time[0]))
      if (arr_time[0] < 24) dt_date.setHours(arr_time[0]);
      else return cal_error ("Invalid hours value: '" + arr_time[0] + "'.\nAllowed range is 00-23.");
   else return cal_error ("Invalid hours value: '" + arr_time[0] + "'.\nAllowed values are unsigned integers.");
   
   if (!arr_time[1]) dt_date.setMinutes(0);
   else if (RE_NUM.exec(arr_time[1]))
      if (arr_time[1] < 60) dt_date.setMinutes(arr_time[1]);
      else return cal_error ("Invalid minutes value: '" + arr_time[1] + "'.\nAllowed range is 00-59.");
   else return cal_error ("Invalid minutes value: '" + arr_time[1] + "'.\nAllowed values are unsigned integers.");

   if (!arr_time[2]) dt_date.setSeconds(0);
   else if (RE_NUM.exec(arr_time[2]))
      if (arr_time[2] < 60) dt_date.setSeconds(arr_time[2]);
      else return cal_error ("Invalid seconds value: '" + arr_time[2] + "'.\nAllowed range is 00-59.");
   else return cal_error ("Invalid seconds value: '" + arr_time[2] + "'.\nAllowed values are unsigned integers.");

   dt_date.setMilliseconds(0);
   return dt_date;
}

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