/**  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 clickbox() {

	//alert("all data correct");

	
	xhReq = createXMLHttpRequest();
	poststring = formData("userDataCapture");
	
	
	
	// remove any dodgy characters
	
	//poststring = poststring.replace("\'"," ");
	poststring = stripNonValidXMLCharacters(poststring);
	//poststring = escape(poststring);
	// remove any single quotes ..
	
	
	
	poststring = poststring.substr(0,poststring.length - 1);


	// now add the coordinate information 
	poststring = poststring + "&geometrytype="+document.forms["processdata"].selected_geometrytype.value;

	// now add the tablename
	poststring = poststring + "&tablename="+document.forms["processdata"].selected_data_type.value;
	// now add the user id
	poststring = poststring + "&userID="+myUsername;
	

	// now iterate through the points and add to the push statement
	var pointsstring = "&points=";
	
	for (var i=0;i< pts.length ; i++) {
		pt = pts[i];
		pointsstring = pointsstring + pt.x +" "+pt.y +",";
	}
	//remove the last comma from pointstring
	pointsstring = pointsstring.substr(0,pointsstring.length -1);
	poststring = poststring + "&"+pointsstring;
	 xhReq.open("POST", "processDataCapture.php", true);
	 xhReq.onreadystatechange = processed;

	 //
	 try {
	   xhReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
	   //xhReq.setRequestHeader('Content-Type','text/html')
	 }
	 catch (e) {
	 	// this only works in internet explorer
	 }
	//alert(poststring);
	xhReq.send(poststring);



}
function processed() {

	// wait for the request to be ready
   if (xhReq.readyState != 4)  {
   		return;
   	}

	startCapture = false;
	clearAllValues();
	alert(xhReq.responseText);
}
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 cancelCapture() {
	if (confirm("Cancel Data Capture?  You will lose all changes.")) {
	
		clearAllValues();
		//setupStep1();
	}

}
/*function formData(theformId) {
	//formId=document.getElementById(formId)
	formId=document.forms[theformId];
	
	var postStr= '';
	for (i = 0; i < formId.elements.length; i++) {
		formElem = formId.elements[i];
		switch (formElem.type) {
			case 'text':
			case 'select-one':
			case 'hidden':
			case 'password':
			case 'textarea':
		//	alert(formElem.name);
		//	alert(escape(formElem.value));
			postStr += formElem.name + '=' + escape(formElem.value) + '&'
		break;
		}
	}
	return postStr;
}*/

function formData(theform) {
	
		theform = document.getElementById(theform);
	
var postStr='';
			for (i = 0; i < theform.elements.length; i++) {
				formElem = theform.elements[i];
				switch (formElem.type) {
					case 'text':
					case 'select-one':
					case 'hidden':
					case 'password':
					case 'textarea':
					postStr += formElem.name + '=' + formElem.value + '&'
				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) {
	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) {
	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 */