// JavaScript Document
dtCh= "-";
minYear=1900;
maxYear=2100;

function confirmDeleteArticle()
{
	if(confirm("Are you sure you want to delete this article?")) {
		bReturnVal = true;
	} else {
		bReturnVal = false;
	};
}

function confirmDeleteEdition()
{
	if(confirm("Are you sure you want to delete this edition? All articles will also be deleted!")) {
		bReturnVal = true;
	} else {
		bReturnVal = false;
	};
}

function validEdition()
{
	var edition_title = document.getElementById("title").value;
	var edition_date = document.getElementById("edition_date").value;

	if (edition_title == '' || edition_date == '') {
		alert('Editions must have a title and edition date!');
		bReturnVal = false;
	} else {
		bReturnVal = true;
	}
}

function validArticle()
{
	var article_title = document.getElementById("title").value;

	if (article_title == '') {
		alert('Articles must have a title!');
		bReturnVal = false;
	} else {
		bReturnVal = true;
	}
}

/*function windowLeft(width) {
     var left;
	 left = (screen.availWidth/2) - (width/2);
	 if (left < 0) {
	  left = 0;
	 }
	 
	 return left;	
}

function windowTop(height) {
     var top;
	 top = (screen.availHeight/2) - (height/2);
	 if (top < 0) {
	  top = 0;
	 }
	 
	 return top;	
}

function openPopup(freshurl, windowname, nWinHeight, nWinWidth) {
	// called by the other open functions
	var nWinTop;
	var nWinLeft;
	var offset = Number(String(Math.random()).substr(3,1));
	
	// to allow for scrollbar
	nWinWidth = nWinWidth + 10;

	nWinTop = windowTop(nWinHeight) + (offset * 5);
	nWinLeft = windowLeft(nWinWidth) + (offset * 5);

    if (windowname == "") {
        windowname = "content_";
	}
	
	//eval(windowname + "= window.open(freshurl, windowname,'statusbar=yes,scrollbars=yes,resizable=yes,toolbar=no,height=' + nWinHeight + ',width=' + nWinWidth + ',top=' + nWinTop + ',left=' + nWinLeft)");
	//if (window.name > "") {
	//	eval("window.onunload = " + windowname + ".close");
	//}
	window.open(freshurl);
	
}

function openEdition(freshurl, windowname)
{
    if (windowname == "" || windowname == undefined ) {
        windowname = "edition_";
    }
	openPopup(freshurl, windowname, 400, 575);
}
*/
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 strDay=dtStr.substring(0,pos1)
	var strMonth=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear

	if (dtStr == "") {
		return true
	}

	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-mmm-yyyy")
		return false
	}
	if (strMonth != "Jan" && strMonth != "Feb" && strMonth != "Mar"
	    && strMonth != "Apr" && strMonth != "May" && strMonth != "Jun"
	    && strMonth != "Jul" && strMonth != "Aug" && strMonth != "Sep"
	    && strMonth != "Oct" && strMonth != "Nov" && strMonth != "Dec"){
		alert("Please enter a valid month [Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec]")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (strMonth=="Feb" && day>daysInFebruary(year))){
		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
}


// This function returns a string padded with leading zeros
function padZeros(num, totalLen) {
	var numStr = num.toString() // Initialize return value
	// as string
	var numZeros = totalLen - numStr.length // Calculate no. of zeros
		if (numZeros > 0) {
			for(var i =1;i <=numZeros; i++) {
				numStr = "0" + numStr
			}
		}
	return numStr
}