/**  this file contains all the code required to valdiate the data entry done by the users
before it is passed to the server 

we need code to:
1. validate that a date is a date
2.  validate that an expiry date is in the future
3. validate the length of text typed in
4. ?? validate that numbers are numbers ?
5.  validate that we have either a postcode or a valid map object
6.  validate external links are all http://


**/







/**
 * 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;

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 clearAllValues() {

	doCloseInfoWindow();
	startCapture = false;
	
	// make sure the date picker is closed
	try {
	  var pickerDiv = document.getElementById(datePickerDivID);
	  pickerDiv.style.visibility = "hidden";
	  pickerDiv.style.display = "none";
	} catch (e) {}

	
	// reset to the start of the data captuer process
	
	clearCaptureOverlays(); // this gets rid of any geometry and also of any values in pts[]
	
	// reset the cursor on the map just in case!
	document.getElementById("map-canvas").style.cursor="hand";	
	
	// clear all the hidden values
	document.forms["processdata"].selected_geometrytype.value = "notselected";
	document.forms["processdata"].selected_capture_type.value = "notselected";
	document.forms["processdata"].selected_postcode.value = "notselected";
	document.forms["processdata"].selected_data_type.value = "notselected";
	
	// then setup the first step again
	setupStep1();
	
}

function formData(theform) {
		theform = document.getElementById(theform);
	
var postStr='';
			for (i = 0; i < theform.elements.length; i++) {
				formElem = theform.elements[i];
				//alert(formElem);
				//switch (formElem.type) {
				//	case 'text':
				//	case 'select-one':
				if (formElem.type == "select-one") {
					// this depends on whether it is a list
					var pos1=formElem.id.indexOf("list");
					if (pos1 > 0) { 
						//this is a list box ... retrieve all values and add them to the 
						//result string as a |XX| separated list
						valueString = processList(formElem);
					}
					else  {
						var valueString = formElem.value;	
					}
				}
				else {
				
				
				//	case 'hidden':
				//	case 'password':
				//	case 'textarea':
					var valueString = formElem.value;
					//postStr += formElem.name + '=' + formElem.value + '&'
				}
					valueString = valueString.replace(/&/g,"and");
					postStr += formElem.id + '=' + valueString + '&'
				//break;
				//}
			}
			
	return postStr;
    }



function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strDay=dtStr.substring(0,pos1)
	var strMonth=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 : dd/mm/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 dateBeforeToday(dtStr) {
	// disable this functionality - the user should be able to select dates prior to the current one if they wish
	return false;
	

/*	dates = dtStr.split("/");
	givenDay = parseInt(dates[0]);
	// javascript date starts month count at 0
	givenMonth = parseInt(dates[1]) - 1;
	givenYear = parseInt(dates[2]);
	var thisDate = new Date();
	thisDate.setYear(givenYear);
	thisDate.setMonth(givenMonth);
	thisDate.setDate(givenDay);

	var now = new Date();
	if (thisDate < now) {
		return true; // the date is earlier than today
	}
	return false;*/
}


function endDateBeforeStartDate(strdtStr,enddtStr) {

	// replace the leading zeros as these cause problems with parseInt - which will return 0!
	
	strdtStr = strdtStr.replace("/0","/");
	enddtStr = enddtStr.replace("/0","/");

	dates = strdtStr.split("/");
	givenDay = parseInt(dates[0]);
	
	// javascripts date starts its months! from 0
	givenMonth = parseInt(dates[1]) - 1;
	givenYear = parseInt(dates[2]);
	
	
	
	var startDate = new Date();
	startDate.setYear(givenYear);
	startDate.setMonth(givenMonth);
	startDate.setDate(givenDay);

	dates = enddtStr.split("/");
	givenDay = parseInt(dates[0]);
	givenMonth = parseInt(dates[1]) - 1;
	givenYear = parseInt(dates[2]);
	
	var endDate = new Date();
	endDate.setYear(givenYear);
	endDate.setMonth(givenMonth);
	endDate.setDate(givenDay);
	
	
	var now = new Date();
	if (endDate < startDate) {
		return true; // 
	}
	return false;  // start and end dates are OK
}



/* end date checking code */
function processList(formElem) {

 var optionsList = "";
 for (var i=0;i< formElem.options.length;i++) {
 	optionsList += formElem.options[i].value;
 	optionsList +=":::";
  
 }
	
	return optionsList;
}