// JavaScript Document
/* 
 +------------------+
 | GLOBAL VARIABLES | 
 +------------------+
*/
fieldErrorBgColor = '#FFB9B9';
fieldBgColor = '#FFFFFF';

/* 
 +---------------------------+
 | Form Validation Functions | 
 +---------------------------+
*/

// evaluate the results of a form validation function and 
// alert any errors and return false;
// submit form and return true if no errors
function evalFormErrors(theForm, isError, errMsg) {
	if (isError >= 1) {	// spit up the error and return false
		alert(errMsg);
		return false;
	} else {	// no erros, submit and return true
		theForm.submit();
		return true;
	}
}

// clear out all error indicators
function clearFormErrors(formObject) {
	for (i=0; i<formObject.elements.length; i++) {
		if (formObject.elements[i].style.backgroundColor != fieldBgColor) {
			formObject.elements[i].style.backgroundColor = fieldBgColor;
		}
	}
}
function ckRootLogin() {
	
	var is_error = 0;
	var error_msg = "The following fields have errors that need to be corrected before continuing:\n\n";
	var formObject = document.login;
	
	clearFormErrors(formObject);	// clear out all previous errors and re-evaluate
	
	// Evaluate the login field
	if (formObject.username.value.length < 1) {
		formObject.username.style.backgroundColor = fieldErrorBgColor;
		error_msg = error_msg + "- Username\n";
		is_error = 1;
	}
	// Evaluate the password field
	if (formObject.password.value.length < 1) {
		formObject.password.style.backgroundColor = fieldErrorBgColor;
		error_msg = error_msg + "- Password\n";
		is_error = 1;
	}
	/* evaluate test results and act accordingly */
	return evalFormErrors(formObject, is_error, error_msg);
}

function validateEmail(emailStr) {
  
  /* OLD, very basic validater
  var at="@";
  var dot=".";
  var lat=str.indexOf(at);
  var lstr=str.length;
  var ldot=str.indexOf(dot);
  
  if (str.indexOf(at)==-1) {
     return false;
  }
  if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr) {
     return false;
  }
  if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr) {
      return false;
  }
   if (str.indexOf(at,(lat+1))!=-1) {
      return false;
   }
   if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot) {
      return false;
   }
   if (str.indexOf(dot,(lat+2))==-1) {
      return false;
   }
   if (str.indexOf(" ")!=-1) {
      return false;
   }
   return true;  
   */
   
   /* more thorough validator */
   
   /* The following variable tells the rest of the function whether or not
	to verify that the address ends in a two-letter country or well-known
	TLD.  1 means check it, 0 means don't. */
	
	var checkTLD=1;
	
	/* The following is the list of known TLDs that an e-mail address must end with. */
	
	var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
	
	/* The following pattern is used to check if the entered e-mail address
	fits the user@domain format.  It also is used to separate the username
	from the domain. */
	
	var emailPat=/^(.+)@(.+)$/;
	
	/* The following string represents the pattern for matching all special
	characters.  We don't want to allow special characters in the address. 
	These characters include ( ) < > @ , ; : \ " . [ ] */
	
	var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
	
	/* The following string represents the range of characters allowed in a 
	username or domainname.  It really states which chars aren't allowed.*/
	
	var validChars="\[^\\s" + specialChars + "\]";
	
	/* The following pattern applies if the "user" is a quoted string (in
	which case, there are no rules about which characters are allowed
	and which aren't; anything goes).  E.g. "jiminy cricket"@disney.com
	is a legal e-mail address. */
	
	var quotedUser="(\"[^\"]*\")";
	
	/* The following pattern applies for domains that are IP addresses,
	rather than symbolic names.  E.g. joe@[123.124.233.4] is a legal
	e-mail address. NOTE: The square brackets are required. */
	
	var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
	
	/* The following string represents an atom (basically a series of non-special characters.) */
	
	var atom=validChars + '+';
	
	/* The following string represents one word in the typical username.
	For example, in john.doe@somewhere.com, john and doe are words.
	Basically, a word is either an atom or quoted string. */
	
	var word="(" + atom + "|" + quotedUser + ")";
	
	// The following pattern describes the structure of the user
	
	var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
	
	/* The following pattern describes the structure of a normal symbolic
	domain, as opposed to ipDomainPat, shown above. */
	
	var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
	
	/* Finally, let's start trying to figure out if the supplied address is valid. */
	
	/* Begin with the coarse pattern to simply break up user@domain into
	different pieces that are easy to analyze. */
	
	var matchArray=emailStr.match(emailPat);
	
	if (matchArray==null) {
	
	/* Too many/few @'s or something; basically, this address doesn't
	even fit the general mould of a valid e-mail address. */
	
	alert("Email address seems incorrect (check @ and .'s)");
	return false;
	}
	var user=matchArray[1];
	var domain=matchArray[2];
	
	// Start by checking that only basic ASCII characters are in the strings (0-127).
	
	for (i=0; i<user.length; i++) {
	if (user.charCodeAt(i)>127) {
	alert("Ths username contains invalid characters.");
	return false;
	   }
	}
	for (i=0; i<domain.length; i++) {
	if (domain.charCodeAt(i)>127) {
	alert("Ths domain name contains invalid characters.");
	return false;
	   }
	}
	
	// See if "user" is valid 
	
	if (user.match(userPat)==null) {
	
	// user is not valid
	
	alert("The username doesn't seem to be valid.");
	return false;
	}
	
	/* if the e-mail address is at an IP address (as opposed to a symbolic
	host name) make sure the IP address is valid. */
	
	var IPArray=domain.match(ipDomainPat);
	if (IPArray!=null) {
	
	// this is an IP address
	
	for (var i=1;i<=4;i++) {
	if (IPArray[i]>255) {
	alert("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) {
	alert("The domain name does not seem to be valid.");
	return false;
	   }
	}
	
	/* domain name seems valid, but now make sure that it ends in a
	known top-level domain (like com, edu, gov) or a two-letter word,
	representing country (uk, nl), and that there's a hostname preceding 
	the domain or country. */
	
	if (checkTLD && domArr[domArr.length-1].length!=2 && 
	domArr[domArr.length-1].search(knownDomsPat)==-1) {
	alert("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) {
	alert("This address is missing a hostname!");
	return false;
	}
	
	// If we've gotten this far, everything's valid!
	return true;
}