/*
 * Class: 		EmailValidation
 * Author: 		matt@gruden.com
 * Date:		25/08/2005
 * Version: 	1.0.0
 *
 * Usage:
 * 		emailValidation = new EmailValidation();
 * 		if(!emailValidation.validate(d.email.value)){
 * 			var errorMessage = emailValidation.getErrorMessage();
 * 			alert(errorMessage);
 * 		}
 */


/*
 * Constructor
 */
function EmailValidation() {
	this.validEmail = true;
	this.errorMessage = "";
} 

// Public Methods
// -----------------------------------------------------------
EmailValidation.prototype.getErrorMessage = function() {
	return this.errorMessage;
}

/* 
 *  Function Based on:
 *	http://javascript.internet.com/forms/email-address-validation.html
 *	V1.1.3: Sandeep V. Tamhankar (stamhankar@hotmail.com)
 *	Original:  Sandeep V. Tamhankar (stamhankar@hotmail.com)
 */
EmailValidation.prototype.validate = function(emailStr) {
	var emailPat=/^(.+)@(.+)$/;
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	var validChars="\[^\\s" + specialChars + "\]";
	var quotedUser="(\"[^\"]*\")";
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	var atom=validChars + '+';
	var word="(" + atom + "|" + quotedUser + ")";
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	var matchArray=emailStr.match(emailPat);
	/* validate whether address ends in a two-letter country or well-known TLD.  1 means check it, 0 means don't. */
	var checkTLD=0;
	
	if (matchArray==null) {	
		this.errorMessage = "Address seems incorrect (check @ and .'s)";
		return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	
	for (i=0; i<user.length; i++) {
		if (user.charCodeAt(i)>127) {
			this.errorMessage = "Ths username contains invalid characters";
			return false;
		}
	}
	
	for (i=0; i<domain.length; i++) {
		if (domain.charCodeAt(i)>127) {
			this.errorMessage = "Ths domain name contains invalid characters";
			return false;
	  	 }
	}
	
	if (user.match(userPat)==null) {
		// user is not valid	
		this.errorMessage = "The username doesn't seem to be valid";
		return false;
	}
	
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
		// this is an IP address
		for (var i=1;i<=4;i++) {
			if (IPArray[i]>255) {
				this.errorMessage = "Destination IP address is invalid";
				return false;
		  	 }
		}
		return true;
	}
	
	// Domain is symbolic name.  Check if it's valid.
	var atomPat=new RegExp("^" + atom + "$");
	var domArr=domain.split(".");
	var len=domArr.length;
	for (i=0;i<len;i++) {
		if (domArr[i].search(atomPat)==-1) {
		this.errorMessage = "The domain name does not seem to be valid";
		return false;
	   }
	}
	
	if (checkTLD && domArr[domArr.length-1].length!=2 && 
		domArr[domArr.length-1].search(knownDomsPat)==-1) {
		this.errorMessage = "The address must end in a well-known domain or two letter " + "country";
		return false;
	}
	
	// Make sure there's a host name preceding the domain.
	if (len<2) {
		this.errorMessage = "This address is missing a hostname";
		return false;
	}
	
	// If we've gotten this far, everything's valid!
	return true;
}
// -----------------------------------------------------------