//----------------------------------------------------------------------
// PopUp Calendar
// (c) 2003 i-TV-T AG, all rights reserved
//----------------------------------------------------------------------

function Calendar(form, field, format) {
  this.name = "cal__" + form + "__" + field;
  Calendar.calendars[this.name] = this;

  this.form = form;
  this.field = field;
  this.format = format;
  this.timefmt = arguments.length == 4 ? arguments[3] : "";

  this.input = document[form][field];
  this.calendar = this.getElement('calendar');
  this.calendarMonths = this.getElement('calendar-months');

  var date = this.parseDate(this.input.value);
  this.createPage(date.getFullYear(), date.getMonth()+1, date.getDate());
  this.dateIn = date;

  this.moveElement(this.calendar, this.getLeft(this.input),
           this.getTop(this.input) + this.getHeight(this.input));
  this.showElement(this.calendar);
  this.calendar.style.display = "block";
  this.switchSelects(false); 
  Calendar.setFocus(false);
}


function Calendar_get(name) {
  return Calendar.calendars[name];
}

//----------------------------------------------------------------------
// basic HTMLElement handling
//

function Calendar_getElement(name) {
  if (document.getElementById) {
    return document.getElementById(name);
  } else {
    for (var i = 0; i < document.all.length; i++)
      if (document.all[i].id == name)
        return document.all[i];
  }
}

function Calendar_showElement(el) {
  el.style.visibility = "visible";
}

function Calendar_hideElement(el) {
  el.style.visibility = "hidden";
}

function Calendar_moveElement(el, left, top) {
  var elH = this.getHeight(el);
  var docH = this.getDocHeight();
  if (top + elH > docH) {
    top = docH - elH;
    if (top < 0)
      top = 0;
  }
  var elW = this.getWidth(el);
  var docW = this.getDocWidth();
  if (left + elW > docW) {
    left = docW - elW;
    if (left < 0)
      left = 0;
  }
  el.style.left = left+"px";
  el.style.top = top+"px";
}

function Calendar_getDocHeight() {
 return Math.max(document.body.scrollHeight,document.documentElement.scrollHeight);

 // if (navigator.appName.indexOf("Microsoft") != -1) {
 //   return document.body.offsetHeight - 2;   
 // } else {
 //    return document.body.scrollHeight;
 // }
}

function Calendar_getDocWidth() {
  return document.body.scrollWidth;
}

function Calendar_getLeft(e) {
  return xc(e);
  /*x = 0;
  while (e) {
    x += e.offsetLeft;
    e = e.offsetParent;
  }
  return x;*/
}

function Calendar_getTop(e) {
  return yc(e);
  // y = 0;
  //while (e) {
  //  y += e.offsetTop;
  //  e = e.offsetParent;
  //}
  //return y;
}

function Calendar_getHeight(e) {
  return e.offsetHeight;
}

function Calendar_getWidth(e) {
  return e.offsetWidth;
}

function Calendar_insertHTML(el, html) {
  el.innerHTML = ""; // IE 5.2 mac bug workaround
  el.innerHTML = html;
}

function Calendar_overlaps(a1, l1, a2, l2) {
  var b1 = a1 + l1;
  var b2 = a2 + l2;
  return ((a1 > a2 && a1 < b2) ||
          (b1 > a2 && b1 < b2) ||
          (a2 > a1 && a2 < b1) ||
          (b2 > a1 && b2 < b1));
}

function Calendar_switchSelects(on) {
  var cl = this.getLeft(this.calendar);
  var ct = this.getTop(this.calendar);
  var ch = this.getHeight(this.calendar);
  var cw = this.getWidth(this.calendar);

  for (var f = 0; f < document.forms.length; f++) {
    var form = document.forms[f];
    for (var e = 0; e < form.elements.length; e++) {
      var el = form.elements[e];
      if (el.type.indexOf('select') >= 0) {
        var sl = this.getLeft(el);
        var st = this.getTop(el);
        var sh = this.getHeight(el);
        var sw = this.getWidth(el);
        if (this.overlaps(cl, cw, sl, sw) &&
            this.overlaps(ct, ch, st, sh)) {
          if (on) {
            this.showElement(el);
          } else {
            this.hideElement(el);
          }
        }
      }
    }
  }
}

//----------------------------------------------------------------------
// date methods
//

var Calendar_monthDays
  = new Array(0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);

function Calendar_getMonthDays(year, month) {
  if (month == 2 && ((year % 400 == 0 || year % 4 == 0 && year % 100 != 0)))
    return 29;
  return Calendar_monthDays[month];
}

function Calendar_parseDate(s) {
  var r;
  var d;
  if ((r = s.match(/(\d+)\s*\.\s*(\d+)\s*\.\s*(\d+)/)) != null) {
    d = new Date(parseInt(r[3], 10), parseInt(r[2], 10) - 1,
        	 parseInt(r[1], 10), 0, 0, 0, 0);
  } else if ((r = s.match(/(\d+)\s*\/\s*(\d+)\s*\/\s*(\d+)/)) != null) {
    d = new Date(parseInt(r[3], 10), parseInt(r[1], 10) - 1,
        	 parseInt(r[2], 10), 0, 0, 0, 0);
  } else if ((r = s.match(/(\d+)\s*-\s*(\d+)\s*-\s*(\d+)/)) != null) {
    d = new Date(parseInt(r[1], 10), parseInt(r[2], 10) - 1,
        	 parseInt(r[3], 10), 0, 0, 0, 0);
  } else {
    d = new Date();
  }

  if ((r = s.match(/(\d+)\s*:\s*(\d+)\s+am/i)) != null) {
    d.setHours(r[1] == '12' ? 0 : parseInt(r[1], 10));
    d.setMinutes(parseInt(r[2], 10));
  } else if ((r = s.match(/(\d+)\s*:\s*(\d+)\s+pm/i)) != null) {
    d.setHours(r[1] == '12' ? 12 : parseInt(r[1], 10) + 12);
    d.setMinutes(parseInt(r[2], 10));
  } else if ((r = s.match(/(\d+)\s*:\s*(\d+)/)) != null) {
    d.setHours(parseInt(r[1], 10));
    d.setMinutes(parseInt(r[2], 10));
  }

  return d;
}

function Calendar_getWeekOfYear(year, month, day)
{
  var date = new Date(year, 0, 1, 0, 0, 0, 0);
  var yd =  date.getDay();
  if (yd == 0)
    yd = 7;
  yd--;
  for (i = 1; i < month; i++) {
    yd += this.getMonthDays(year, i);
  }
  yd += day - 1;
  return Math.floor(yd / 7) + 1;
}

//----------------------------------------------------------------------
// build calendar stuff
//

function Calendar_createPage(year, month, monthDay) {
  var dateInput = this.parseDate(this.input.value);
  var dateToday = new Date();
  var dateFirst = new Date(year, month-1, 1, 0, 0, 0, 0);
  var weekDay1 = dateFirst.getDay();
  if (weekDay1 == 0)
    weekDay1 = 7;

  var cw = this.getWeekOfYear(year, month, 1);

  // surrounding months
  var lastMonth = month == 1  ? 12 : month - 1;
  var nextMonth = month == 12 ? 1  : month + 1;
  var lastYear  = month == 1  ? year - 1 : year;
  var nextYear  = month == 12 ? year + 1 : year;
  var lastDays = this.getMonthDays(lastYear, lastMonth);
  var thisDays = this.getMonthDays(year, month);
  var nextDays = this.getMonthDays(nextYear, nextMonth);

  var scrollMethod = 'Calendar.get(\'' + this.name + '\').scrollPage';
  var monthsMethod = 'Calendar.get(\'' + this.name + '\').showMonths';
  var handlerBack1  = scrollMethod + '(' + lastYear + ',' + lastMonth + ');';
  var handlerBack12 = scrollMethod + '(' + (year-1) + ',' + month + ');';
  var handlerFwd1   = scrollMethod + '(' + nextYear + ',' + nextMonth + ');';
  var handlerFwd12  = scrollMethod + '(' + (year+1) + ',' + month + ');';
  var handlerMonths = monthsMethod + '(' + year + ');';

  var header =
    '<table border="0" cellpadding="0" cellspacing="0" width="100%">' +
    '<tr class="calendar-title"><td align="left">'+
    '<a class="calendar-navigate" href="' +
    'javascript:' + handlerBack12 +
    '">&lt;&lt;</a>&nbsp;&nbsp;'+
    '<a class="calendar-navigate" href="' +
    'javascript:' + handlerBack1 +
    '">&nbsp;&lt;&nbsp;</a></td>' +
    '<td align="center">&nbsp;&nbsp;<a href="javascript:' + handlerMonths +
    '" id="calendar-months-open">' +
    Calendar.monthLabels[month] + '</a>&nbsp; ' + year + '&nbsp;&nbsp;</td>' +
    '<td align="right"><a class="calendar-navigate" href="'+
    'javascript:' + handlerFwd1 +
    '">&nbsp;&gt;&nbsp;</a>&nbsp;&nbsp;'+
    '<a class="calendar-navigate" href="'+
    'javascript:' + handlerFwd12 +
    '">&gt;&gt;</a></td></tr></table>';

  var table = '<table border="0" cellpadding="1" cellspacing="1" width="100%">' +
    '<tr><td colspan="8" align="center">' + header + '</td></tr>' +
    '<tr><td class="calendar-week-label">' + Calendar.calendarWeekLabel +
    '</td>';

  for (i = 0; i < Calendar.dayLabels.length; i++) {
    table += '<td class="calendar-day-label">'
    table += Calendar.dayLabels[i];
    table += '</td>';
  }
  table += "</tr>";

  var daysInLast = weekDay1 - 1;
  var daysUntilNext = daysInLast + thisDays;
  var displayedDays = daysUntilNext;
  while (displayedDays % 7 != 0)
    displayedDays++;

  for (i = 0; i < displayedDays; i++) {
    if (i % 7 == 0) {
      table += '<tr align="right"><td class="calendar-week-num">'
        + (cw++) + '</td>';
    }
    var style = "";
    var d = 0;
    var selDate = "";
    if (i < daysInLast) {
      d = lastDays - (weekDay1 - 2 - i);
      style = 'calendar-day-next';
      selDate = lastYear + ',' + lastMonth + ',' + d;
    } else if (i < daysUntilNext) {
      d = i - daysInLast + 1;
      if (d == dateInput.getDate() && month == dateInput.getMonth()+1 &&
          year == dateInput.getFullYear())
        style = 'calendar-day-selected';
      else if (d == dateToday.getDate() && month == dateToday.getMonth()+1 &&
          year == dateToday.getFullYear())
        style = 'calendar-day-today';
      else
        style = 'calendar-day-num';
      selDate = year + ',' + month + ',' + d;
    } else {
      d = i - daysUntilNext + 1;
      style = 'calendar-day-next';
      selDate = nextYear + ',' + nextMonth + ',' + d;
    }
    var selectMethod = 'Calendar.get(\'' + this.name + '\').selectDate';
    var handler = selectMethod + '('  + selDate + ');';
    table += '<td class="' + style + '" onclick="' + handler + '">';
    table += '<a class="' + style + '" href="javascript:' + handler;
    table += '">' + d + '</a>';
    table += '</td>';
    if (i % 7 == 6)
      table += '</tr>';
  }

  table += "</table>";

  this.insertHTML(this.calendar, table);
  this.calendarMonthsOpen = this.getElement("calendar-months-open");
}

function Calendar_scrollPage(year, month) {
  this.hideElement(this.calendarMonths);
  this.createPage(year, month, -1);
  this.showElement(this.calendar);
}

function Calendar_selectDate(year, month, day) {
  if (month < 10)
    month = '0' + month;
  if (day < 10)
    day = '0' + day;

  var t = "";
  var h = this.dateIn.getHours();
  var m = this.dateIn.getMinutes();
  if (m < 10)
    m = "0" + m;
  if (this.timefmt == '12') {
    var s;
    if (h < 12) {
      s = "AM";
      if (h == 0)
        h = 12;
    } else {
      s = "PM";
      if (h > 12)
        h -= 12;
    }
    t = " " + h + ":" + m + " " + s;
  } else if (this.timefmt == '24') {
    if (h < 10)
      h = "0" + h;
    t = " " + h + ":" + m;
  }

  if (this.format == '.') {
    this.input.value = day + '.' + month + '.' + year + t;
  } else if (this.format == '-') {
    this.input.value = year + '-' + month + '-' + day + t;
  } else {
    this.input.value = month + '/' + day + '/' + year + t;
  }

  this.hide();

  // f.h. 2004/02/25 BEGIN
  // set focus to calendar input field
  // this is used to make HTTrace actually work with calendars
  this.input.focus();
  // f.h. 2004/02/25 END

}

function Calendar_showMonths(year, event) {
  var choice = '<table border="0" cellpadding="1" cellspacing="0">';
  var scrollMethod = 'Calendar.get(\'' + this.name + '\').scrollPage';
  for (i = 1; i < Calendar.monthLabels.length; i++) {
    choice += '<tr><td align="left"><a class="calendar-navigate-months" '+
      'href="javascript:' + scrollMethod + '(' + year + ',' + i + ');">' +
      Calendar.monthLabels[i] + '</a></td></tr>';
  }
  choice += '</table>';

  this.insertHTML(this.calendarMonths, choice);
  this.moveElement(this.calendarMonths,
        	   this.getLeft(this.calendarMonthsOpen),
        	   this.getTop(this.calendarMonthsOpen) +
        	   this.getHeight(this.calendarMonthsOpen));
  this.showElement(this.calendarMonths); 
}

function Calendar_hide() {
  this.hideElement(this.calendar);
  this.hideElement(this.calendarMonths);
  this.switchSelects(true);
}


function Calendar_hideAll() {
  if (window.itvtcalendarkill) {
   for (var name in Calendar.calendars)
     Calendar.calendars[name].hide();
  }
}

function Calendar_setFocus(focus) {
  if (focus) {
    window.itvtcalendarkill = false;
  } else {
    window.itvtcalendarkill = true;
    if (!window.itvtdocclick) {
      window.itvtdocclick = Calendar.hideAll.bindAsEventListener(this);
      Element.observe(document,"mousedown",window.itvtdocclick);
    }
  }  
}

//----------------------------------------------------------------------
// initialization
//

Calendar.calendars = new Object();
Calendar.get = Calendar_get;

Calendar.prototype.getElement    = Calendar_getElement;
Calendar.prototype.showElement   = Calendar_showElement;
Calendar.prototype.hideElement   = Calendar_hideElement;
Calendar.prototype.moveElement   = Calendar_moveElement;
Calendar.prototype.getDocHeight  = Calendar_getDocHeight;
Calendar.prototype.getDocWidth   = Calendar_getDocWidth;
Calendar.prototype.getLeft       = Calendar_getLeft;
Calendar.prototype.getTop        = Calendar_getTop;
Calendar.prototype.getHeight     = Calendar_getHeight;
Calendar.prototype.getWidth      = Calendar_getWidth;
Calendar.prototype.insertHTML    = Calendar_insertHTML;
Calendar.prototype.switchSelects = Calendar_switchSelects;
Calendar.prototype.overlaps      = Calendar_overlaps;

Calendar.prototype.getMonthDays  = Calendar_getMonthDays;
Calendar.prototype.parseDate     = Calendar_parseDate;
Calendar.prototype.getWeekOfYear = Calendar_getWeekOfYear;

Calendar.prototype.createPage    = Calendar_createPage;
Calendar.prototype.scrollPage    = Calendar_scrollPage;
Calendar.prototype.selectDate    = Calendar_selectDate;
Calendar.prototype.showMonths    = Calendar_showMonths;
Calendar.prototype.hide          = Calendar_hide;

Calendar.hideAll                 = Calendar_hideAll;
Calendar.setFocus                = Calendar_setFocus;

//----------------------------------------------------------------------
// may be overwritten by localized calendars
//
Calendar.monthLabels = new Array("", "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December");
Calendar.dayLabels = new Array("Mo", "Tu", "We", "Th", "Fr", "Sa", "Su");
Calendar.calendarWeekLabel = "CW";
//
//----------------------------------------------------------------------

//----------------------------------------------------------------------
// create popups
//
document.write('<div id="calendar" style="display:none" '+
               ' onmouseover="Calendar.setFocus(true)"' +
               ' onmouseout="Calendar.setFocus(false)"></div>');
document.write('<div id="calendar-months" style="display:none" '+
               ' onmouseover="Calendar.setFocus(true)"' +
               ' onmouseout="Calendar.setFocus(false)"></div>');