var iFrameDivID = "datepickeriframe";
var dayArrayShort = new Array('Sö', 'Må', 'Ti', 'On', 'To', 'Fr', 'Lö');
var dayArrayMed = new Array('Sön', 'Mån', 'Tis', 'Ons', 'Tor', 'Fre', 'Lör');
var dayArrayLong = new Array('Söndag', 'Måndag', 'Tisdag', 'Onsdag', 'Torsdag', 'Fredag', 'Lördag');
var monthArrayShort = new Array('Ja', 'Fe', 'Ma', 'Ap', 'Ma', 'Ju', 'Jul', 'Au', 'Se', 'Ok', 'No', 'De');
var monthArrayMed = new Array('Jan', 'Feb', 'Mar', 'Apr', 'Maj', 'Jun', 'Jul', 'Aug', 'Sep', 'Okt', 'Nov', 'Dec');
var monthArrayLong = new Array('Januari', 'Februari', 'Mars', 'April', 'Maj', 'Juni', 'Juli', 'Augusti', 'September', 'Oktober', 'November', 'December');
var defaultDateSeparator = "-";
var defaultDateFormat = "ymd";
var dateSeparator = defaultDateSeparator;
var dateFormat = defaultDateFormat;

function displayDatePicker(e)
{
	var dateFieldId = this.id;
	var targetDateField = document.getElementById(dateFieldId);
	displayBelowThisObject = targetDateField;
	var x = displayBelowThisObject.offsetLeft;
	var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;
	var parent = displayBelowThisObject;
	while (parent.offsetParent) {
		parent = parent.offsetParent;
		x += parent.offsetLeft;
		y += parent.offsetTop ;
	}
	
	drawDatePicker(targetDateField, x, y);
	return false;
}


function drawDatePicker(targetDateField, x, y)
{
  var dt = getFieldDate(targetDateField.value);
  if (!document.getElementById('datepicker')) {
    var newNode = document.createElement("div");
    newNode.id = 'datepicker';
    newNode.setAttribute("class", "dpDiv");
    newNode.setAttribute("style", "visibility: hidden;");
    document.body.appendChild(newNode);
  }
 
  var pickerDiv = document.getElementById('datepicker');
  pickerDiv.style.position = "absolute";
  pickerDiv.style.left = x + "px";
  pickerDiv.style.top = y + "px";
  pickerDiv.style.visibility = (pickerDiv.style.visibility == "visible" ? "hidden" : "visible");
  pickerDiv.style.display = (pickerDiv.style.display == "block" ? "none" : "block");
  pickerDiv.style.zIndex = 10000;
  refreshDatePicker(targetDateField.id, dt.getFullYear(), dt.getMonth(), dt.getDate());
}


function refreshDatePicker(dateFieldId, year, month, day)
{
  var thisDay = new Date();
  if ((month >= 0) && (year > 0)) { thisDay = new Date(year, month, 1); }
  else { day = thisDay.getDate(); thisDay.setDate(1); }
 
  var crlf = "\r\n";
  var TABLE = "<table cols=7 class='dpTable'>" + crlf;
  var xTABLE = "</table>" + crlf;
  var TR = "<tr class='dpTR'>";
  var TR_title = "<tr class='dpTitleTR'>";
  var TR_days = "<tr class='dpDayTR'>";
  var TR_todaybutton = "<tr class='dpTodayButtonTR'>";
  var xTR = "</tr>" + crlf;
  var TD = "<td class='dpTD' onMouseOut='this.className=\"dpTD\";' onMouseOver=' this.className=\"dpTDHover\";' ";
  var TD_title = "<td colspan=5 class='dpTitleTD'>";
  var TD_buttons = "<td class='dpButtonTD'>";
  var TD_todaybutton = "<td colspan=7 class='dpTodayButtonTD'>";
  var TD_days = "<td class='dpDayTD'>";
  var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";
  var xTD = "</td>" + crlf;
  var DIV_title = "<div class='dpTitleText'>";
  var DIV_selected = "<div class='dpDayHighlight'>";
  var xDIV = "</div>";
 
  var html = TABLE;
 
  html += TR_title;
  html += TD_buttons + getButtonCode(dateFieldId, thisDay, -1, "&nbsp;",'back') + xTD;
  html += TD_title + DIV_title + monthArrayLong[ thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;
  html += TD_buttons + getButtonCode(dateFieldId, thisDay, 1, "&nbsp;",'forward') + xTD;
  html += xTR;
 
  html += TR_days;
  for(i = 0; i < dayArrayShort.length; i++)
    html += TD_days + dayArrayShort[i] + xTD;
  html += xTR;
 
  html += TR;
 
  for (i = 0; i < thisDay.getDay(); i++)
    html += TD + "&nbsp;" + xTD;
 
  do {
    dayNum = thisDay.getDate();
    TD_onclick = " onclick=\"checkDate('" + dateFieldId + "', '" + getDateString(thisDay) + "');\">";
    
    if (dayNum == day)
      html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;
    else
      html += TD + TD_onclick + dayNum + xTD;
    
    if (thisDay.getDay() == 6)
      html += xTR + TR;
    
    thisDay.setDate(thisDay.getDate() + 1);
  } while (thisDay.getDate() > 1)
 
  if (thisDay.getDay() > 0) {
    for (i = 6; i > thisDay.getDay(); i--)
      html += TD + "&nbsp;" + xTD;
  }
  html += xTR;
 
  var today = new Date();
  var todayString = "Today is " + dayArrayMed[today.getDay()] + ", " + monthArrayMed[ today.getMonth()] + " " + today.getDate();
  html += TR_todaybutton + TD_todaybutton;
  html += "<button class='dpTodayButton' onclick='refreshDatePicker(\"" + dateFieldId + "\");'>Denna månad</button> ";
  html += "<button class='dpTodayButton' onclick='checkDate(\"" + dateFieldId + "\");'>Stäng</button>";
  html += xTD + xTR;
  html += xTABLE;
 
  if( document.getElementById('datepicker') ) { document.getElementById('datepicker').innerHTML = html; }
  adjustiFrame();
}


function getButtonCode(dateFieldId, dateVal, adjust, label, cl)
{
  var newMonth = (dateVal.getMonth () + adjust) % 12;
  var newYear = dateVal.getFullYear() + parseInt((dateVal.getMonth() + adjust) / 12);
  if (newMonth < 0) {
    newMonth += 12;
    newYear += -1;
  }
 
  return "<button class='dpButton "+cl+"' onclick='refreshDatePicker(\"" + dateFieldId + "\", " + newYear + ", " + newMonth + ");'>" + label + "</button>";
}


function getDateString(dateVal)
{
  var dayString = "00" + dateVal.getDate();
  var monthString = "00" + (dateVal.getMonth()+1);
  dayString = dayString.substring(dayString.length - 2);
  monthString = monthString.substring(monthString.length - 2);
 
  switch (dateFormat) {
    case "dmy" :
      return dayString + dateSeparator + monthString + dateSeparator + dateVal.getFullYear();
    case "ymd" :
      return dateVal.getFullYear() + dateSeparator + monthString + dateSeparator + dayString;
    case "mdy" :
    default :
      return monthString + dateSeparator + dayString + dateSeparator + dateVal.getFullYear();
  }
}


function getFieldDate(dateString)
{
  var dateVal;
  var dArray;
  var d, m, y;
 
  try {
    dArray = splitDateString(dateString);
    if (dArray) {
      switch (dateFormat) {
        case "dmy" :
          d = parseInt(dArray[0], 10);
          m = parseInt(dArray[1], 10) - 1;
          y = parseInt(dArray[2], 10);
          break;
        case "ymd" :
          d = parseInt(dArray[2], 10);
          m = parseInt(dArray[1], 10) - 1;
          y = parseInt(dArray[0], 10);
          break;
        case "mdy" :
        default :
          d = parseInt(dArray[1], 10);
          m = parseInt(dArray[0], 10) - 1;
          y = parseInt(dArray[2], 10);
          break;
      }
      dateVal = new Date(y, m, d);
    } else if (dateString) {
      dateVal = new Date(dateString);
    } else {
      dateVal = new Date();
    }
  } catch(e) {
    dateVal = new Date();
  }
 
  return dateVal;
}

function splitDateString(dateString)
{
  var dArray;
  if (dateString.indexOf("/") >= 0)
    dArray = dateString.split("/");
  else if (dateString.indexOf(".") >= 0)
    dArray = dateString.split(".");
  else if (dateString.indexOf("-") >= 0)
    dArray = dateString.split("-");
  else if (dateString.indexOf("\\") >= 0)
    dArray = dateString.split("\\");
  else
    dArray = false;
 
  return dArray;
}

function checkDate(dateFieldId, dateString)
{
	if( dateString )
	{
		if( dateString.match(/^\d{4}-\d{2}-\d{2}$/) )
		{
			var d = new Date();
			var thisDay = d.getTime();
			var chosenDate = strtotime('dt',dateString+' 23:59:50');
			var jsChosenDate = chosenDate * 1000;

			var b_change = true;
			if( dateFieldId.match(/pub|ticketStartDate|endDate/g) )
			{
				var dbId = dateFieldId.replace(/[^0-9]/g,'');
				if( document.getElementById('startDate_'+dbId) && document.getElementById('startDate_'+dbId).value )
				{
					var startDate = strtotime('dt',document.getElementById('startDate_'+dbId).value+' 23:59:59');
					var dat = (dateFieldId.match(/pub/g)) ? 'Publiceringsdatum' : ((dateFieldId.match(/end/g)?'Slutdatum':'Biljettsläppsdatum'));
					if( !dateFieldId.match(/end/g) && chosenDate > startDate ) { alert(dat+' får inte äga rum efter evenemanget'); b_change = false; }
					else if( dateFieldId.match(/end/g) && chosenDate < startDate ) { alert(dat+' får inte äga rum före evenemangets startdatum'); b_change = false; }
				}
			}
			else if( dateFieldId.match(/startDate/g) )
			{
				var dbId = dateFieldId.replace(/[^0-9]/g,'');
				if( document.getElementById('ticketStartDate_'+dbId) && document.getElementById('ticketStartDate_'+dbId).value
				|| document.getElementById('pub_'+dbId) && document.getElementById('pub_'+dbId).value )
				{
					var othDate = (document.getElementById('pub_'+dbId) && document.getElementById('pub_'+dbId).value) ?
									document.getElementById('pub_'+dbId).value : document.getElementById('ticketStartDate_'+dbId).value;
					
					othDate = strtotime('dt',othDate+' 23:59:40');
					var dat = (document.getElementById('pub_'+dbId) && document.getElementById('pub_'+dbId).value) ? 'publiceringsdatum' : 'biljettsläppsdatum';
					if( chosenDate < othDate )
					{
						alert('Evenemanget kan inte äga rum innan '+dat); b_change = false;
					}
				}
				else if( document.getElementById('endDate_'+dbId) && document.getElementById('endDate_'+dbId).value )
				{
					var othDate = document.getElementById('endDate_'+dbId).value;
					othDate = strtotime('dt',othDate+' 23:59:40');
					if( chosenDate > othDate ) { alert('Evenemanget kan inte äga rum efter slutdatumet'); b_change = false; }
				}
			}

			
			if( b_change )
			{
				if( jsChosenDate > thisDay || (dateFieldId == 'startDate' || dateFieldId == 'endDate') ) { updateDateField(dateFieldId, dateString) }
				else alert('Det datum du valt har redan inträffat');
			}
		}
		else { verifyField(document.getElementById(dateFieldId),'',''); }
	}
	else updateDateField(dateFieldId, '');
}

function updateDateField(dateFieldId, dateString)
{
  var targetDateField = document.getElementById(dateFieldId);
  
  if (dateString) targetDateField.value = dateString;
 
 if( document.getElementById('datepicker') )
 {
	var pickerDiv = document.getElementById('datepicker');
	
	pickerDiv.style.visibility = "hidden";
	pickerDiv.style.display = "none";
	adjustiFrame();
 }

  targetDateField.focus();
  if( targetDateField.id && targetDateField.id != 'startDate' && targetDateField.id != 'endDate' ) verifyField(targetDateField);
}

function adjustiFrame(pickerDiv, iFrameDiv)
{
 var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
  if (is_opera) return;
  
  try {
    if (!document.getElementById(iFrameDivID)) {
      var newNode = document.createElement("iFrame");
      newNode.setAttribute("id", iFrameDivID);
      newNode.setAttribute("src", "javascript:false;");
      newNode.setAttribute("scrolling", "no");
      newNode.setAttribute ("frameborder", "0");
      document.body.appendChild(newNode);
    }
    
    if( !pickerDiv && document.getElementById('datepicker') ) { pickerDiv = document.getElementById('datepicker'); }
    if( !iFrameDiv && iFrameDivID && document.getElementById(iFrameDivID) ) { iFrameDiv = document.getElementById(iFrameDivID); }
    
    try {
      iFrameDiv.style.position = "absolute";
      iFrameDiv.style.width = pickerDiv.offsetWidth;
      iFrameDiv.style.height = pickerDiv.offsetHeight ;
      iFrameDiv.style.top = pickerDiv.style.top;
      iFrameDiv.style.left = pickerDiv.style.left;
      iFrameDiv.style.zIndex = pickerDiv.style.zIndex - 1;
      iFrameDiv.style.visibility = pickerDiv.style.visibility ;
      iFrameDiv.style.display = pickerDiv.style.display;
    } catch(e) {
    }
 
  } catch (ee) {
  }
 
}