// Is it a valid email address?
// Assume valid if got the @ 
// in it
function isEmailAddr(email)
{
	var result = false;
	var theStr = new String(email);
	var index = theStr.indexOf("@");
	if (index > 0)
	{
		var pindex = theStr.indexOf(".",index);
		if ((pindex > index+1) && (theStr.length > pindex+1))
		result = true;
	}
	return result;
}

// Return true if the required field is 
// not empty
function validRequired(formField,fieldLabel)
{
	var result = true;

	if (formField.value == "")
	{
		alert('Please enter a value for the "' + fieldLabel +'" field.');
		formField.focus();
		result = false;
	}
	return result;
}

// Make sure that a valid selection has been 
// made, one without an empty value
function validSelection(formField,fieldLabel)
{
	var result = true;

	if (formField.value == "")
	{
		alert('Please choose a value for the "' + fieldLabel +'" field.');
		result = false;
	}

	return result;
}

// Returns true if there are all digits in the string
function allDigits(str)
{
	return inValidCharSet(str,"0123456789");
}

function inValidCharSet(str,charset)
{
	var result = true;

	// Note: doesn't use regular expressions to avoid early Mac browser bugs	
	for (var i=0;i<str.length;i++) {
		if (charset.indexOf(str.substr(i,1))<0)
		{
			result = false;
			break;
		}
	}

	return result;
}

// Checks to see if it is a valid email address
function validEmail(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result && ((formField.value.length < 3) || !isEmailAddr(formField.value)) )
	{
		alert("Please enter a complete email address in the form: yourname@yourdomain.com");
		formField.focus();
		result = false;
	}
	return result;
}

// Checks to see if it is just a number with only digits in it
function validNum(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result)
	{
		if (!allDigits(formField.value))
		{
			alert('Please enter a number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	} 

	return result;
}

// Checks to see if it is a valid positive integer
function validInt(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;
	
	if (result)
	{
		var num = parseFloat(parseInt(formField.value));		
		var num2 = parseFloat(formField.value);
		if (isNaN(num2))
		{
			alert('Please enter a positive whole number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
		else if (isNaN(num))
		{
			alert('Please enter a positive whole number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
		else if (num != num2) {
			alert('Please enter a positive whole number for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}					
	} 

	return result;
}

function intInBound(formField, fieldLabel, required, min, max){
	var result = false;
	result = validInt(formField, fieldLabel, required); 
	if (result){
		var num = parseInt(formField.value);
		if (num < min){
			alert('Please enter a whole number of at least '+min+' for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}	
		else if (num > max){
			alert('Please enter a whole number no more than '+max+' for the "' + fieldLabel +'" field.');
			formField.focus();		
			result = false;
		}
	}
	return result;	
}


function validDate(formField,fieldLabel,required)
{
	var result = true;

	if (required && !validRequired(formField,fieldLabel))
		result = false;

	if (result)
	{
		var elems = formField.value.split("/");

		result = (elems.length == 3); // should be three components

		if (result)
		{
			var month = parseInt(elems[0]);
			var day = parseInt(elems[1]);
			var year = parseInt(elems[2]);
			result = allDigits(elems[0]) && (month > 0) && (month < 13) &&
			allDigits(elems[1]) && (day > 0) && (day < 32) &&
			allDigits(elems[2]) && ((elems[2].length == 2) || (elems[2].length == 4));
		}

		if (!result)
		{
			alert('Please enter a date in the format MM/DD/YYYY for the "' + fieldLabel +'" field.');
			formField.focus();		
		}
	} 

	return result;
}

function populateHiddenFields(theForm){
	//alert("populating hiddenFields");
	if (elementExistsInForm(theForm, "scent")){
		theForm.scentVal.value = theForm.scent.options[theForm.scent.selectedIndex].text;
	}
	if (elementExistsInForm(theForm, "colour")){
		theForm.colourVal.value = theForm.colour.options[theForm.colour.selectedIndex].text;
	}
	if (elementExistsInForm(theForm, "design")){
		theForm.designVal.value = theForm.design.options[theForm.design.selectedIndex].text;
	}
	
	if (elementExistsInForm(theForm,"contents")){
	
		var contents = "";
		if (elementExistsInForm(theForm,"description")){
			contents += theForm.description.value;
			contents += ".  ";
		}
		
		var theElements = theForm.elements;
		for(var j = 0; j < theElements.length; j++) {		
			if (theElements[j].name != "minQuantity" && 
				theElements[j].name != "price" &&
				theElements[j].name != "quantity" && 
				theElements[j].name != "contents" &&
				theElements[j].name != "productType" &&
				theElements[j].name != "description" &&
				theElements[j].name != "personalDetails"){
				
				//alert(theElements[j].name+" is "+theElements[j].type);
				
				if (theElements[j].type == "select-one"){
					//alert("select element");
					contents += theElements[j].name;
					contents += " = "
					contents += theElements[j].options[theElements[j].selectedIndex].value; 
					contents += ". "
				}
				
				if (theElements[j].type == "text"){
					//alert("text element");
					contents += theElements[j].name;
					contents += " = "
					contents += theElements[j].value; 
					contents += ". "
				}
													
			}
		}
		theForm.contents.value = contents;
	}

	
	
}

function selectsHaveNonEmptyValueSelected(theForm){
	var theElements = theForm.elements;
	for(var j = 0; j < theElements.length; j++) {		
								
			if (theElements[j].type == "select-one"){
				//alert("checking valid select-one "+theElements[j].options[theElements[j].selectedIndex]+" "+theElements[j].options[0].text); 
				if (!validSelection(theElements[j].options[theElements[j].selectedIndex],theElements[j].options[0].text)){
					return false;
				}
			}
	}
	return true;

}

function elementExistsInForm(theForm, elementName){
	var theElements = theForm.elements;
	for(var j = 0; j < theElements.length; j++) {
		if (theElements[j].name == elementName){
			return true;
		}
	}
	return false;
}

function validateForm(theForm)
{
	//alert("In validateForm");
	if (!cookiesAllowed()){
		return false;
	}
	//alert("1");
	if (elementExistsInForm(theForm,"scent")){
		if (!validSelection(theForm.scent.options[theForm.scent.selectedIndex],"Scent"))
		return false;
	}
	//alert("2");
	if (elementExistsInForm(theForm,"colour")){
		if (!validSelection(theForm.colour.options[theForm.colour.selectedIndex],"Colour"))
		return false;
	}
	//alert("3");
	if (elementExistsInForm(theForm,"design")){
		if (!validSelection(theForm.design.options[theForm.design.selectedIndex],"Design"))
		return false;
	}
	//alert("4");
	if (!selectsHaveNonEmptyValueSelected(theForm)){
		return false;
	}
	
	//alert("5");
	if (!(elementExistsInForm(theForm,"minQuantity"))){
		//alert('minQuantity not in form');
			if (!intInBound(theForm.quantity,"Quantity", true,1,1000)){
				return false;
			}
	}
	else {
		//alert('minQuantity IN form');
		//alert('minQuantity IN form'+theForm.minQuantity.value);
		if (!intInBound(theForm.quantity,"Quantity", true,theForm.minQuantity.value,1000)){
				return false;
			}

	}
		
	//alert("In validateForm - about to populateHiddenFields");	
	populateHiddenFields(theForm);
	//alert("In validateForm - done populateHiddenFields");

	return true;
}

function cookiesAllowed()
{
 /* check for a cookie */
  if (document.cookie == "") 
  {
    /* if a cookie is not found - alert user -
     change cookieexists field value to false */
    alert("COOKIES need to be enabled on your browser to use the shopping basket!");

   	return false;
  } else {
   return true;
  }
}

document.cookie = "This is a test cookie to ensure one exists"