/**
This is a JavaScript library based on the DatePicker originally written by Julian Robichaux and modified by Mark Esdale
*/

var timePickerDivID = "timepicker";
var iFrameDivID = "timepickeriframe";

// these variables define the date formatting we're expecting and outputting.
// If you want to use a different format by default, change the defaultDateSeparator
// and defaultDateFormat variables either here or on your HTML page.
var defaultTimeSeparator = ":";        // common values would be "/" or "."
var defaultTimeFormat = "hm"    // valid values are "mdy", "dmy", and "ymd"
var timeSeparator = defaultDateSeparator;
var timeFormat = defaultDateFormat;

function displayTimePicker(timeFieldName, displayBelowThisObject, dtFormat, dtSep)
{
  var targetTimeField = document.getElementsByName (timeFieldName).item(0);
 
  // if we weren't told what node to display the datepicker beneath, just display it
  // beneath the date field we're updating
  if (!displayBelowThisObject)
    displayBelowThisObject = targetTimeField;
 
  // if a time separator character was given, update the timeSeparator variable
  if (dtSep)
    timeSeparator = dtSep;
  else
    timeSeparator = defaultTimeSeparator;
 
  // if a time format was given, update the timeFormat variable
  if (dtFormat)
    timeFormat = dtFormat;
  else
    timeFormat = defaultTimeFormat;
 
  var x = displayBelowThisObject.offsetLeft;
  var y = displayBelowThisObject.offsetTop + displayBelowThisObject.offsetHeight ;
 
  // deal with elements inside tables and such
  var parent = displayBelowThisObject;
  while (parent.offsetParent) {
    parent = parent.offsetParent;
    x += parent.offsetLeft;
    y += parent.offsetTop ;
  }
 
  drawTimePicker(targetTimeField, x, y);
}


/**
Draw the datepicker object (which is just a table with time elements) at the
specified x and y coordinates, using the targetTimeField object as the input tag
that will ultimately be populated with a time.

This function will normally be called by the displayTimeePicker function.
*/
function drawTimePicker(targetTimeField, x, y)
{
  var dt = getFieldTime(targetTimeField.value );
 
  // the timepicker table will be drawn inside of a <div> with an ID defined by the
  // global timePickerDivID variable. If such a div doesn't yet exist on the HTML
  // document we're working with, add one.
  if (!document.getElementById(timePickerDivID)) {
    // don't use innerHTML to update the body, because it can cause global variables
    // that are currently pointing to objects on the page to have bad references
    //document.body.innerHTML += "<div id='" + timePickerDivID + "' class='dpDiv'></div>";
    var newNode = document.createElement("div");
    newNode.setAttribute("id", timePickerDivID);
    newNode.setAttribute("class", "dpDiv");
    newNode.setAttribute("style", "visibility: hidden;");
    document.body.appendChild(newNode);
  }
 
  // move the timepicker div to the proper x,y coordinate and toggle the visiblity
  var pickerDiv = document.getElementById(timePickerDivID);
  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;

  // draw the datepicker table
  refreshTimePicker(targetTimeField.name, dt.getHours(), dt.getMinutes());
}


/**
This is the function that actually draws the timepicker table.
*/
function refreshTimePicker(timeFieldName, hour, minute)
{
  // if no arguments are passed, use today's date; otherwise, month and year
  // are required (if a day is passed, it will be highlighted later)
  var thisDay = new Date();
 
  if ((hour >= 0) && (minute > 0)) {
    thisDay.getDate()
    thisDay = new Date(thisDay.getYear(), thisDay.getMonth(), thisDay.getDay(), hour, minute);
  } else {
    thisDay.getDate();
    thisDay.setDate(1);
  }
 
  // the time picker will be drawn as a table
  // you can customize the table elements with a global CSS style sheet,
  // or by hardcoding style and formatting elements below
  var crlf = "\r\n";
  var TABLE = "<table cols=12 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\";' ";    // leave this tag open, because we'll be adding an onClick event
  var TD_title = "<td colspan=5 class='dpTitleTD'>";
  var TD_buttons = "<td class='dpButtonTD'>";
  var TD_todaybutton = "<td colspan=12 class='dpTodayButtonTD'>";
  var TD_days = "<td class='dpDayTD'>";
  var TD_selected = "<td class='dpDayHighlightTD' onMouseOut='this.className=\"dpDayHighlightTD\";' onMouseOver='this.className=\"dpTDHover\";' ";    // leave this tag open, because we'll be adding an onClick event
  var xTD = "</td>" + crlf;
  var DIV_title = "<div class='dpTitleText'>";
  var DIV_selected = "<div class='dpDayHighlight'>";
  var xDIV = "</div>";
 
  // start generating the code for the calendar table
  var html = TABLE;
 
   // now we'll start populating the table with days of the month
  html += TR;
 
  // first, the leading blanks
  for (i = 0; i < 48; i++)
  {
    var strTime = getTimeString(i>>1,i&1) ;
    TD_onclick = " onclick=\"updateTimeField('" + timeFieldName + "', '" + strTime + "');\">";
    if (hour == (i>>1) && (((i&1) && minute >=30) || (!(i&1) && minute <30)))
      html += TD_selected + TD_onclick + DIV_selected + strTime + xDIV + xTD;
    else
      html += TD + TD_onclick + strTime + xTD;
    if (i%12 == 11)
      html += xTR + TR;
  }
 /* 
  // now, the days of the month
  do {
    dayNum = thisDay.getDate();
    
    if (dayNum == day)
      html += TD_selected + TD_onclick + DIV_selected + dayNum + xDIV + xTD;
    else
      html += TD + TD_onclick + dayNum + xTD;
    
    // if this is a Saturday, start a new row
    if (thisDay.getDay() == 6)
      html += xTR + TR;
    
    // increment the day
    thisDay.setDate(thisDay.getDate() + 1);
  } while (thisDay.getDate() > 1)
 
  // fill in any trailing blanks
  if (thisDay.getDay() > 0) {
    for (i = 6; i > thisDay.getDay(); i--)
      html += TD + "&nbsp;" + xTD;
  }
 */
 html += xTR;
 
  // add a button to allow the user to easily return to today, or close the calendar
  html += TR_todaybutton + TD_todaybutton;
  html += "<button class='dpTodayButton' onClick='updateTimeField(\"" + timeFieldName + "\");'>close</button>";
  html += xTD + xTR;
 
  // and finally, close the table
  html += xTABLE;
 
  document.getElementById(timePickerDivID).innerHTML = html;
  // add an "iFrame shim" to allow the timepicker to display above selection lists
  adjustiFrame();
}



/**
Convert a JavaScript Date object to a string, based on the timeFormat and timeSeparator
variables at the beginning of this script library.
*/
function getTimeString(hour, bHalf)
{
  var hourString = "00" + hour;
  var minuteString = (bHalf)?"30":"00";
  hourString = hourString.substring(hourString.length - 2);
 
  switch (timeFormat) {
    case "hm" :
      return hourString + timeSeparator + minuteString ;
    default :
      return hourString + timeSeparator + minuteString ;
  }
}


/**
Convert a string to a JavaScript Date object.
*/
function getFieldTime(dateString)
{
  var dateVal;
  var dArray;
  var h, m ;
 
  try 
  {
    dArray = splitTimeString(dateString);
    if (dArray)
    {
      switch (dateFormat)
      {
        default :
          h = parseInt(dArray[0], 10);
          m = parseInt(dArray[1], 10);
          break;
      }
      dateVal = new Date(2008,1,1,h,m);
    } 
    else if (dateString)
    {
      dateVal = new Date(dateString);
    } 
    else 
    {
      dateVal = new Date();
    }
  } 
  catch(e)
  {
    dateVal = new Date();
  }
 
  return dateVal;
}


/**
Try to split a time string into an array of elements, using common time separators.
If the time is split, an array is returned; otherwise, we just return false.
*/
function splitTimeString(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 if (dateString.indexOf(":") >= 0)
    dArray = dateString.split(":");
  else
    dArray = false;

 
  return dArray;
}

/**
Update the field with the given dateFieldName with the dateString that has been passed,
and hide the datepicker. If no dateString is passed, just close the datepicker without
changing the field value.

Also, if the page developer has defined a function called datePickerClosed anywhere on
the page or in an imported library, we will attempt to run that function with the updated
field as a parameter. This can be used for such things as date validation, setting default
values for related fields, etc. For example, you might have a function like this to validate
a start date field:

function datePickerClosed(dateField)
{
  var dateObj = getFieldDate(dateField.value);
  var today = new Date();
  today = new Date(today.getFullYear(), today.getMonth(), today.getDate());
 
  if (dateField.name == "StartDate") {
    if (dateObj < today) {
      // if the date is before today, alert the user and display the datepicker again
      alert("Please enter a date that is today or later");
      dateField.value = "";
      document.getElementById(datePickerDivID).style.visibility = "visible";
      adjustiFrame();
    } else {
      // if the date is okay, set the EndDate field to 7 days after the StartDate
      dateObj.setTime(dateObj.getTime() + (7 * 24 * 60 * 60 * 1000));
      var endDateField = document.getElementsByName ("EndDate").item(0);
      endDateField.value = getDateString(dateObj);
    }
  }
}

*/
function updateTimeField(dateFieldName, dateString)
{
  var targetDateField = document.getElementsByName (dateFieldName).item(0);
  if (dateString)
    targetDateField.value = dateString;
 
  var pickerDiv = document.getElementById(timePickerDivID);
  pickerDiv.style.visibility = "hidden";
  pickerDiv.style.display = "none";
 
  adjustiFrame();
  targetDateField.focus();
 
  // after the datepicker has closed, optionally run a user-defined function called
  // datePickerClosed, passing the field that was just updated as a parameter
  // (note that this will only run if the user actually selected a date from the datepicker)
  if ((dateString) && (typeof(datePickerClosed) == "function"))
    timePickerClosed(targetDateField);
}


/**
Use an "iFrame shim" to deal with problems where the datepicker shows up behind
selection list elements, if they're below the datepicker. The problem and solution are
described at:

http://dotnetjunkies.com/WebLog/jking/archive/2003/07/21/488.aspx
http://dotnetjunkies.com/WebLog/jking/archive/2003/10/30/2975.aspx
*/
function adjustiFrame(pickerDiv, iFrameDiv)
{
  // we know that Opera doesn't like something about this, so if we
  // think we're using Opera, don't even try
  var is_opera = (navigator.userAgent.toLowerCase().indexOf("opera") != -1);
  if (is_opera)
    return;
  
  // put a try/catch block around the whole thing, just in case
  try {
    if (!document.getElementById(iFrameDivID)) {
      // don't use innerHTML to update the body, because it can cause global variables
      // that are currently pointing to objects on the page to have bad references
      //document.body.innerHTML += "<iframe id='" + iFrameDivID + "' src='javascript:false;' scrolling='no' frameborder='0'>";
      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) {
  }
 
}