// JavaScript Document
function formValidator(){
	// Make quick references to our fields
	var name = document.getElementById('name');
	var email = document.getElementById('email');
	var contnum = document.getElementById('contnum');
	var numrooms = document.getElementById('numrooms');
	var troom = document.getElementById('troom');
	var aper = document.getElementById('aper');
	var cper = document.getElementById('cper');
	var info = document.getElementById('info');
	
	// Check each input in the order that it appears in the form!
	if(isAlphabet(name, "Please enter only letters for your name")){
			if(isNumeric(contnum, "Please enter a contact number (numbers only)")){
				if(isNumeric(numrooms, "Please enter a number of rooms")){
					if(madeSelection(aper, "Please select Adult per room")){
						if(madeSelection(cper, "Please select Adult per room")){
							if(madeSelection(troom, "Please select number of children.")){
								if(lengthRestriction(info, 4, 240)){
									if(emailValidator(email, "Please enter a valid email address")){
									return true;
									}
								}
							}
						}
					}
				}
			}
		
	}
	return false;
	
}

function notEmpty(elem, helperMsg){
	if(elem.value.length == 0){
		alert(helperMsg);
		elem.focus(); // set the focus to this input
		return false;
	}
	return true;
}

function isNumeric(elem, helperMsg){
	var numericExpression = /^[0-9]+$/;
	if(elem.value.match(numericExpression)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function isAlphabet(elem, helperMsg){
	var alphaExp = /^[a-zA-z\s]+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function isAlphanumeric(elem, helperMsg){
	var alphaExp = /^[0-9a-zA-Z]+$/;
	if(elem.value.match(alphaExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}

function lengthRestriction(elem, min, max){
	var uInput = elem.value;
	if(uInput.length >= min && uInput.length <= max){
		return true;
	}else{
		alert("Please enter between " +min+ " and " +max+ " characters");
		elem.focus();
		return false;
	}
}

function madeSelection(elem, helperMsg){
	if(elem.value == "Please Choose"){
		alert(helperMsg);
		elem.focus();
		return false;
	}else{
		return true;
	}
}

function emailValidator(elem, helperMsg){
	var emailExp = /^[\w\-\.\+]+\@[a-zA-Z0-9\.\-]+\.[a-zA-z0-9]{2,4}$/;
	if(elem.value.match(emailExp)){
		return true;
	}else{
		alert(helperMsg);
		elem.focus();
		return false;
	}
}