/**
 * 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 isDate(dtStr, doAlert){
	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){
		if (doAlert) {
			alert("Please enter a valid date.  The date format should be MM/DD/YYYY.");
		}
		return false;
	}
	if (strMonth.length<1 || month<1 || month>12){
		if (doAlert) {
			alert("Please enter a valid month.  The date format should be MM/DD/YYYY.");
		}
		return false;
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		if (doAlert) {
			alert("Please enter a valid day.  The date format should be MM/DD/YYYY.");
		}
		return false;
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		if (doAlert) {
			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){
		if (doAlert) {
			alert("Please enter a valid date.  The date format should be MM/DD/YYYY.");
		}
		return false;
	}
	return true;
}

/* ************************************************ */
/* Ryan's validation routines                       */
/* ************************************************ */

function isEmpty(field) {
	return (field == null || field == undefined || !field.value.match("\\S"));
}

function isEmptyPhone(f1, f2, f3) {
	return (isEmpty(f1) && isEmpty(f2) && isEmpty(f3));
}
	
function checkText(field, message) {
	if (isEmpty(field)) {
		alert(message);
		field.focus();
		return false;
	}
	return true;
}

function checkNoText(field, message) {
	if (!isEmpty(field)) {
		alert(message);
		field.focus();
		return false;
	}
	return true;
}

function checkEmail(field, message) {
	// regex from Kalani p. 171
	if (!isEmpty(field)) {
		if (!field.value.match("\\w+([-+.]\\w+)*@\\w+([-.]\\w+)*\\.\\w+([-.]\\w+)*")) {
			alert(message);
			field.focus();
			return false;
		}
	}
	return true;
}

function checkRadio(field, message) {
	if (field == null) {
		alert(message);
		return false;
	}
	if (radioSelection(field) != -1)
		return true;
	alert(message);
	field[0].focus();
	return false;
}

function radioSelection(field) {
	for (var i = 0; i < field.length; i++)
		if (field[i].checked)
			return i;
	return -1;	
}

function checkSelect(field, message) {
	if (valueOfSelect(field) == "") {
		alert(message);
		field.focus();
		return false;
	}
	return true;
}

function valueOfSelect(field) {
	return field.options[field.selectedIndex].value;
}

function checkNumber(field, minimum, maximum, message) {
	if (isEmpty(field)) {
		alert(message);
		field.focus();
		return false;
	}
	if (isNaN(parseInt(field.value))) {
		alert(message);
		field.focus();
		return false;
	}
	var n = parseInt(field.value);
	if (minimum != NaN && n < minimum) {
		alert(message);
		field.focus();
		return false;
	}
	if (maximum != NaN && n > maximum) {
		alert(message);
		field.focus();
		return false;
	}
	return true;
}

function defaultField(field, val) {
	if (isEmpty(field))
		field.value = val;
}

function validateBrokerNumber(bn, doAlert) {
	if (!bn.match("[0-9]{7}") || bn.length != 7) {
		if (doAlert)
			alert("Broker number " + bn + " is not a 7-digit number.");
		return false;
	}
	
	if (bn.charAt(0) != '0') {
		if (doAlert)
			alert("Broker number " + bn + " does not start with a zero.");
		return false;
	}
	
	var validBranches = "0123457";
	if (validBranches.indexOf(bn.charAt(1)) == -1) {
		if (doAlert)
			alert("Broker number " + bn + " contains an incorrect branch number.  Valid branches are 0, 1, 2, 3, 4, 5 and 7.");
		return false;
	}
	
	return true;
}