var datePickerDivID = "datepicker";
var iFrameDivID     = "datepickeriframe";
var arrivalDateId   = "dtpDataInizio";
var departureDateId = "dtpDataFine";
var defaultDateSeparator = "-";      
var defaultDateFormat = "dmy";  
var dateSeparator = defaultDateSeparator;
var dateFormat = defaultDateFormat;
var today = new Today(false, false, false);
var tomorrow = new Today(today.currentYear, today.currentMonth, today.currentDay+1);
var arrival_day;
var departure_day;
var lastArrivalDate;
var lastDepartureDate;
var datesAreChanged = true;
var datesAreCorrect = true;

function displayDatePicker(dateFieldName, dtFormat, dtSep)
{
  var targetDateField = document.getElementById(dateFieldName);


  dateSeparator = dtSep ? dtSep : defaultDateSeparator;

  dateFormat = dtFormat ? dtFormat : defaultDateFormat;
 
  var x = targetDateField.offsetLeft;
  var y = targetDateField.offsetTop + targetDateField.offsetHeight ;
  var parent = targetDateField;
  while (parent.offsetParent) 
  {
    parent = parent.offsetParent;
    x += parent.offsetLeft;
    y += parent.offsetTop ;
  }

  drawDatePicker(targetDateField, x, y);
}
function Today(yyyy, mm, gg)
{
  var t1;
  var t2;
  t1 = new Date();

  var anno = yyyy ? yyyy : t1.getFullYear();
  var mese = mm ? mm : t1.getMonth();
  var giorno = gg ? gg : t1.getDate();

  t2 = new Date(anno, mese, giorno);

  this.currentMonth = t2.getMonth();
  this.currentYear  = t2.getFullYear();
  this.currentDay   = t2.getDate();
  this.dateString   = getDateString(t2);
}

function drawDatePicker(targetDateField, x, y)
{
  var day;
  var month;
  var year;
  var tdfn = targetDateField.name;
  var tdfv = targetDateField.value;
  var dt   = getFieldDate(tdfv);

  if (!document.getElementById(datePickerDivID)) 
  {
    var newNode = document.createElement("div");
    newNode.setAttribute("id", datePickerDivID);
    newNode.setAttribute("class", "dpDiv");
    newNode.setAttribute("style", "visibility: hidden;");
    document.body.appendChild(newNode);
  }
 
  var pickerDiv = document.getElementById(datePickerDivID);
  if (pickerDiv)
  {
    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;
  }

  day   = tdfv != "" ? dt.getDate() : ad_day;
  month = tdfv != "" ? dt.getMonth() : ad_month;
  year  = tdfv != "" ? dt.getFullYear() : ad_year;

  refreshDatePicker(tdfn, year, month, day);
}

function refreshDatePicker(dateFieldName, year, month, day)
{
  var first_day = new Today(false, false, false);

  var adday   = first_day.currentDay;
  var admonth = first_day.currentMonth;
  var adyear  = first_day.currentYear;

  if (dateFieldName == departureDateId) 
  {
    updateArrivalDay();
    if (arrival_day_setted)
    {
      adday   = ad_day;
      admonth = ad_month;
      adyear  = ad_year;
    }
  }

  var thisDay = new Date(year, month, 1);

  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\";'";  
  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\";'";    
  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(dateFieldName, thisDay, -1, "&laquo;") + xTD;
  html += TD_title + DIV_title + monthArrayLong[currLanguage][thisDay.getMonth()] + " " + thisDay.getFullYear() + xDIV + xTD;
  html += TD_buttons + getButtonCode(dateFieldName, thisDay, 1, "&raquo;") + xTD;
  html += xTR;
 
  html += TR_days;
  for(i = 0; i < dayArrayShort[currLanguage].length; i++)
    html += TD_days + dayArrayShort[currLanguage][i] + xTD;
  html += xTR;
 
  html += TR;
 
  for (i = 0; i < thisDay.getDay(); i++)
    html += TD + "&nbsp;" + xTD;
 
  do 
  {
    dayNum = thisDay.getDate();
    var dayIsNotSelectable = false;
    var yearOfThisDay  = thisDay.getFullYear();
    var monthOfThisDay = thisDay.getMonth();

    if (yearOfThisDay == adyear)
    {
      if (monthOfThisDay < admonth) dayIsNotSelectable = true;
      else
      {
        if (monthOfThisDay > admonth) dayIsNotSelectable = false;
        else
        {
          dayIsNotSelectable = dayNum < adday ? true : false;
        }
      }
    }
    else if (yearOfThisDay > adyear)
    {
      dayIsNotSelectable = false;
    }
    else
    {
      dayIsNotSelectable = true;
    }

    TD_unselectable = dayIsNotSelectable ? ' style="color:#CCCCCC"' : " onMouseOver='this.className=\"dpTDHover\";'";
    TD_onclick = dayIsNotSelectable ? ">" : " onclick=\"updateDateField('" + dateFieldName + "', '" + getDateString(thisDay) + "');\">";

    if (dayNum == day)
      html += TD_selected + TD_unselectable + TD_onclick + DIV_selected + dayNum + xDIV + xTD;
    else
      html += TD + TD_unselectable + 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 = 7; i > thisDay.getDay(); i--)
      html += TD + "&nbsp;" + xTD;
  }
  html += xTR;
 
  html += TR_todaybutton + TD_todaybutton;
  html += "<button class='dpTodayButton' onClick='closeCalendar(\"" + dateFieldName + "\");'>" + chiudiCalendario[currLanguage] + "</button>";
  html += xTD + xTR;

  html += xTABLE;

  if (document.getElementById(datePickerDivID)) document.getElementById(datePickerDivID).innerHTML = html;
  adjustiFrame();
}

function getButtonCode(dateFieldName, dateVal, adjust, label)
{
  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' onClick='refreshDatePicker(\"" + dateFieldName + "\", " + newYear + ", " + newMonth + ");'>" + label + "</button>";
}

var arrival_day_setted;
var departure_day_setted;
var page_reloaded;
var datesCheckEnabled = false;

function disableDatesCheck()
{
  datesCheckEnabled = false;
}

function setDefaultDates(adv, ddv)
{
  var dd = document.getElementById(departureDateId);
  var ad = document.getElementById(arrivalDateId);

  if (ad)
  { 
    if (adv) ad.value = adv;
    else ad.value = today.dateString;
  }

  if (dd)
  { 
    if (ddv) dd.value = ddv;
    else dd.value = tomorrow.dateString;
  }
}

function stringToDate(stringDate) 
{
  var result = false;
  var s = new String(stringDate);

  if (s.length > 0)
  {
    var a = s.split("/");
    var day = currLanguage != "us" ? new String(a[0]) : new String(a[1]);
    var month = currLanguage != "us" ? new String(a[1]) : new String(a[0]);
    var year = new String(a[2]);

    day = day.charAt(0) == "0" ? day.charAt(1) : day;
    month = month.charAt(0) == "0" ? month.charAt(1) : month;

    var dd = parseInt(day);
    var mm = parseInt(month) - 1; // month must be 0-11
    var yyyy = parseInt(year);
    var d = new Date(yyyy, mm, dd);

    result = d.getTime();
  }

  return result;
}

function checkRequestDates()
{
  var arrival_date_field = document.getElementById(arrivalDateId);
  var departure_date_field = document.getElementById(departureDateId);
  var arrival_date = arrival_date_field.value;
  var departure_date = departure_date_field.value;
  var arrivalDate = stringToDate(arrival_date);
  var departureDate = stringToDate(departure_date);
  var dateDiff = departureDate - arrivalDate;
  var arrivalDateObj = getFieldDate(arrival_date);
  var departureDateObj = getFieldDate(departure_date);

  datesAreChanged = (departure_date != lastDepartureDate) || (arrival_date != lastArrivalDate) ? true : false;

  var departureDateIsFilled = departure_date != "" ? true : false;
  var arrivalDateIsFilled = arrival_date != "" ? true : false;

  if (arrivalDateIsFilled && departureDateIsFilled && datesAreChanged) 
  {
    if (dateDiff < 1)
    {
      var next_day = arrivalDateObj.getDate() + 1;
      departureDate = new Date(arrivalDateObj.getFullYear(), arrivalDateObj.getMonth(), next_day);
      var firstAvailableDepartureDate = getDateString(departureDate);
      departure_date_field.value = firstAvailableDepartureDate;
    }

    dateDiff = departureDate - arrivalDate;
    var wrongDates = dateDiff < 1 ? true : false;
    var wid = "dateWarning";

    if (wrongDates)
    {
      datesAreCorrect = false;
    }
    else 
    {
      datesAreCorrect = true;
    }
  }

  lastDepartureDate = departure_date;
  lastArrivalDate = arrival_date;
  datesAreChanged = false;
}

function setDates()
{
  page_reloaded = true;
  var dd = document.getElementById(departureDateId);
  var ad = document.getElementById(arrivalDateId);

  if (ad && ad.value != "") setArrivalDay(ad.value);
  else arrival_day = new Today(false, false, false);

  if (dd && dd.value != "") setDepartureDay(dd.value);
  else departure_day = new Today(false, false, false);

  ad_year  = arrival_day.currentYear;
  ad_month = arrival_day.currentMonth;
  ad_day   = arrival_day.currentDay;
}

function updateArrivalDay()
{
  var ad = document.getElementById(arrivalDateId);
  var ad_value = ad.value;

  if (ad && ad_value != "") 
  {
    setArrivalDay(ad_value);
  }
}
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 dayString + dateSeparator + monthString + 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[0], 10);
          m = parseInt(dArray[1], 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 datePickerClosed(dateField)
{
  var dateObj = getFieldDate(dateField.value);
  updateDates(dateField.name, dateObj);
}

function closeCalendar(dateFieldName, dateString)
{
  var targetDateField = document.getElementById(dateFieldName);
  if (dateString && targetDateField) targetDateField.value = dateString;

  var pickerDiv = document.getElementById(datePickerDivID);
  if (pickerDiv) 
  {
    pickerDiv.style.visibility = "hidden";
    pickerDiv.style.display = "none";
  }

  adjustiFrame();
  targetDateField.focus();
}


var ad_year  = today.currentYear;
var ad_month = today.currentMonth;
var ad_day   = today.currentDay;
var dd_year  = ad_year;
var dd_month = ad_month;
var dd_day   = ad_day + 1;
var lastDayOfTheYear = "31/12/" + today.currentYear;

function setArrivalDay(date_string)
{
  var dobj = getFieldDate(date_string);
  var dd   = dobj.getDate();
  var mm   = dobj.getMonth();
  var yyyy = dobj.getFullYear();

  if (date_string == lastDayOfTheYear) 
  {
    ad_year  = yyyy;
    ad_month = 11;
    ad_day   = 31;
  }
  else
  {
    ad_year  = yyyy;
    ad_month = mm;
    ad_day   = dd + 1;
  }

  arrival_day = new Today(ad_year, ad_month, ad_day);
  arrival_day_setted = true;
}

function setDepartureDay(date_string)
{
  var dobj = getFieldDate(date_string);
  var dd   = dobj.getDate();
  var mm   = dobj.getMonth();
  var yyyy = dobj.getFullYear();
  
  if (date_string == lastDayOfTheYear) 
  {
    dd_year  = yyyy;
    dd_month = 11;
    dd_day   = 31;
  }
  else
  {
    dd_year  = yyyy;
    dd_month = mm;
    dd_day   = dd + 1;
  }
  
  departure_day = new Today(yyyy, mm, dd);
  departure_day_setted = true;
}

function updateDateField(dateFieldName, dateString)
{
  var targetDateField = document.getElementById(dateFieldName);
  if (dateString && targetDateField) targetDateField.value = dateString;

  if (dateFieldName == arrivalDateId) setArrivalDay(dateString);
  else setDepartureDay(dateString);

  var pickerDiv = document.getElementById(datePickerDivID);
  if (pickerDiv) 
  {
    pickerDiv.style.visibility = "hidden";
    pickerDiv.style.display = "none";
  }

  adjustiFrame();
  targetDateField.focus();
  try 
  {
    if (datesCheckEnabled) checkDates();
    else checkRequestDates();
  }
  catch (e) 
  {
    alert("Error in function checkDates() in calendar.js: " + e);
  }
}


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)
      pickerDiv = document.getElementById(datePickerDivID);
    if (!iFrameDiv)
      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) {
  }
 
}

function getDefaultFormatValue(format)
{
    var val = "";

    switch(format)
    {
        case "dmy":
            val = "dd/mm/yyyy";
            break;
        case "mdy":
            val = "mm/dd/yyyy";
            break;
        case "ymd":
            val = "yyyy/mm/dd";
            break;
    }

    return val;
}

function updateDates(fieldName, dateObject)
{
    var gg = dateObject.getDate();
    var mm = dateObject.getMonth();
    var yyyy = dateObject.getFullYear();

    if (gg==31 || (gg==30 && (mm==11 || mm==4 || mm==6 || mm==9)))
    {
        gg = 1;
        if (mm < 12) mm += 1;
        else 
        {
            mm = 1;
            yyyy += 1;
        }
    }
    else gg += 1;
}



function setCalendarLanguage(lang)
{
    currLanguage = lang;
}

var dayArrayShort = new Array();
dayArrayShort['it'] = new Array('Dom', 'Lun', 'Mar', 'Mer', 'Gio', 'Ven', 'Sab');
dayArrayShort['en'] = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
dayArrayShort['fr'] = dayArrayShort['en'];
dayArrayShort['es'] = dayArrayShort['en'];
dayArrayShort['de'] = dayArrayShort['en'];

var dayArrayMed = new Array('Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat');
var dayArrayLong = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
var monthArrayShort = new Array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec');
var monthArrayMed = new Array('Jan', 'Feb', 'Mar', 'Apr', 'May', 'June', 'July', 'Aug', 'Sept', 'Oct', 'Nov', 'Dec');

var monthArrayLongEn = new Array('January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December');
var monthArrayLongIt = new Array('Gennaio', 'Febbraio', 'Marzo', 'Aprile', 'Maggio', 'Giugno', 'Luglio', 'Agosto', 'Settembre', 'Ottobre', 'Novembre', 'Dicembre');
var monthArrayLong = new Array();
monthArrayLong['it'] = monthArrayLongIt;
monthArrayLong['en'] = monthArrayLongEn;
monthArrayLong['fr'] = monthArrayLong['en'];
monthArrayLong['es'] = monthArrayLong['en'];
monthArrayLong['de'] = monthArrayLong['en'];

var chiudiCalendario = new Array();
chiudiCalendario['it'] = "chiudi";
chiudiCalendario['en'] = "close";
chiudiCalendario['fr'] = chiudiCalendario['en'];
chiudiCalendario['es'] = chiudiCalendario['en'];
chiudiCalendario['de'] = chiudiCalendario['en'];

var meseCorrente = new Array();
meseCorrente['it'] = "questo mese";
meseCorrente['en'] = "this month";
meseCorrente['fr'] = meseCorrente['en'];
meseCorrente['es'] = meseCorrente['en'];
meseCorrente['de'] = meseCorrente['en'];