/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;
var ok_clicked=false;
var cancel_clicked=false;

function isInteger(s){
        var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
        var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function daysInFebruary (year){
        // February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
        for (var i = 1; i <= n; i++) {
                this[i] = 31
                if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
                if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
        var daysInMonth = DaysArray(12)
        var pos1=dtStr.indexOf(dtCh)
        var pos2=dtStr.indexOf(dtCh,pos1+1)
        var strMonth=dtStr.substring(0,pos1)
        var strDay=dtStr.substring(pos1+1,pos2)
        var strYear=dtStr.substring(pos2+1)
        strYr=strYear
        if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
        if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
        for (var i = 1; i <= 3; i++) {
                if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
        }
        month=parseInt(strMonth)
        day=parseInt(strDay)
        year=parseInt(strYr)
        if (pos1==-1 || pos2==-1){
                alert("The date format should be : mm/dd/yyyy")
                return false
        }
        if (strMonth.length<1 || month<1 || month>12){
                alert("Please enter a valid month")
                return false
        }
        if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
                alert("Please enter a valid day")
                return false
        }
        if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
                alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
                return false
        }
        if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
                alert("Please enter a valid date")
                return false
        }
return true
}

function ValidateWorkdayEntry(){
    if (cancel_clicked==true) {
        return true
    }
        var dt=document.WorkdayEntry.EventDate
        var desc=document.WorkdayEntry.Description
        if (isDate(dt.value)==false){
                dt.focus()
                return false
        }
        if (desc.value=="") {
            desc.focus()
            return false
        }
    return true
}

function isValidTime(timeStr) {
// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.

        var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;

        var matchArray = timeStr.match(timePat);
        if (matchArray == null) {
                alert("Time is not in a valid format.");
                return false;
        }
        hour = matchArray[1];
        minute = matchArray[2];
        second = matchArray[4];
        ampm = matchArray[6];

        if (second=="") { second = null; }
        if (ampm=="") { ampm = null }

        if (hour < 0  || hour > 23) {
                alert("Hour must be between 1 and 12. (or 0 and 23 for military time)");
                return false;
        }
        if (hour <= 12 && ampm == null) {
                if (confirm("Please indicate which time format you are using.  OK = Standard Time, CANCEL = Military Time")) {
                        alert("You must specify AM or PM.");
                        return false;
                }
        }
        if  (hour > 12 && ampm != null) {
                alert("You can't specify AM or PM for military time.");
                return false;
        }
        if (minute<0 || minute > 59) {
                alert ("Minute must be between 0 and 59.");
                return false;
        }
        if (second != null && (second < 0 || second > 59)) {
                alert ("Second must be between 0 and 59.");
                return false;
        }
        return true;
}

function ValidateVolunteerShift(){
    if (cancel_clicked==true) {
        return true
    }
    var start_tm = new Date()
    var end_tm = new Date()
    var start_txt=document.VolunteerShift.start_time
    var end_txt=document.VolunteerShift.end_time
    if (start_txt.value != "") {
                if (isValidTime(start_txt.value)==false) {
                start_txt.focus();
                return false;
        }
    }
    if (end_txt.value != "") {
                if (isValidTime(end_txt.value)==false) {
                end_txt.focus()
                return false
        }
    }
    if ((end_txt.value != "") && (start_txt.value != "")) {
        start_tm = Date.parse("January 1, 1970 " + start_txt.value)
        end_tm = Date.parse("January 1, 1970 " + end_txt.value)
        if (end_tm < start_tm) {
                        alert("End time is before start time")
                end_txt.focus()
                return false
        }
    }
    return true
}

function ValidateVolunteer(){
    if (cancel_clicked==true) {
        return true
    }
    var first=document.NewVolunteer.first_name
    var last=document.NewVolunteer.last_name
    if (first.value == "") {
                alert("Missing first name")
        first.focus()
        return false
    }
    if (last.value == "") {
                alert("Missing last name")
        last.focus()
        return false
    }
    return true
}

// AJAX Lists retrieval code
var xmlHttp
var enabletip=false;

function updateLists(email)
{ 
  xmlHttp=GetXmlHttpObject()
  if (xmlHttp==null)
  {
    return true
  }
  var url="get_lists.php"
  url=url+"?email="+email
  url=url+"&sid="+Math.random()
  xmlHttp.onreadystatechange=stateChanged 
  xmlHttp.open("GET",url,true)
  xmlHttp.send(null)
  return true
}

function stateChanged() 
{ 
  if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
  { 
    var lists = xmlHttp.responseText.split("|")
    for (i=0; i<lists.length; i++) {
      if (lists[i] != "") {
        document.getElementById("List"+lists[i]).checked = true
      }
    }
  }
}

function GetXmlHttpObject()
{
  var xmlHttp=null;
  try
    {
    // Firefox, Opera 8.0+, Safari
      xmlHttp=new XMLHttpRequest();
    }
    catch (e)
    {
      //Internet Explorer
      try
      {
        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
      }
      catch (e)
      {
        xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      }
    }
  return xmlHttp;
}