/** PARTICIPANT VALIDATIONS */
var noEmailMessage = 'You have to enter your email address to login!';
var noPasswordMessage = 'You forgot to enter your password!';
var invalidDataMessage = 'Invalid data entered.\n' +
							'Please check that you have filled in all fields correctly.';
var passwordsNotMatchMessage = 'The two passwords do not match!';
var invalidEmailMessage = 'Invalid email address entered.\n' +
							'Please check that you have filled the email field correctly.';


function trim(str)
{
   return str.replace(/^\s*|\s*$/g,"");
}


function clearClass(objects) {
	for (i=0; i<objects.length; i++) {
		obj = document.getElementById(objects[i]);
		obj.className = '';
	}
}


/** VALIDATIONS **/
function validateLoginInfo() {
	var form = document.loginForm;
	
	var email = form.email.value;
	var pass = form.password.value;
	
	// clear class for all elements
	var objects = new Array(2);
	objects[0] = "temail";
	objects[1] = "tpass";
	clearClass(objects);
	
	if (!trim(email)) {
		obj = document.getElementById("temail");
		obj.className = "add_error";
		alert(noEmailMessage);
		return false;
	}

	if (!trim(pass)) {
		obj = document.getElementById("tpass");
		obj.className = "add_error";
		alert(noPasswordMessage);
		return false;
	}
	return true;
}

function validateMyAccount() {
	var form = document.accountForm;
	
	var name = form.name.value;
	var email = form.email.value;
	var password = form.password.value;
	var passwordConfirm = form.passwordConfirm.value;
	
	// clear class for all elements
	var objects = new Array(4);
	objects[0] = "tname";
	objects[1] = "temail";
	objects[2] = "tpassword";
	objects[3] = "tpasswordConfirm";
	clearClass(objects);
	
	if (!trim(name)) {
		obj = document.getElementById("tname");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	if (!trim(email)) {
		obj = document.getElementById("temail");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	if (!emailCheck(email)) {
		obj = document.getElementById("temail");
		obj.className = "add_error";
		alert(invalidEmailMessage);
		return false;
	}

	if (!trim(password)) {
		obj = document.getElementById("tpassword");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	if (!trim(passwordConfirm)) {
		obj = document.getElementById("tpasswordConfirm");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	if (!(password == passwordConfirm)) {
		obj = document.getElementById("tpassword");
		obj.className = "add_error";
		obj = document.getElementById("tpasswordConfirm");
		obj.className = "add_error";
		alert(passwordsNotMatchMessage);
		return false;
	}
	
	return true;
}


function validateEditActionPlan() {
	var form = document.planForm;
	
	var plan = form.actionPlan.value;
	
	if (!(trim(plan))) {
		alert(invalidDataMessage);
		return false;
	}
	
	return true;
}


function validateAddEditActivity() {
	var form = document.activityForm;
	
	var name = form.name.value;
	var objective = form.objective.value;
	var observations = form.observations.value;
	var participantId = form.participantId.options[form.participantId.selectedIndex].value;
	var status = form.status.options[form.status.selectedIndex].value;
	
	// clear class for all elements
	var objects = new Array(5);
	objects[0] = "tname";
	objects[1] = "tobjective";
	objects[2] = "tobservations";
	objects[3] = "tresponsable";
	objects[4] = "tstatus";
	clearClass(objects);
	
	if (!trim(name)){
		obj = document.getElementById("tname");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	if (!trim(objective)){
		obj = document.getElementById("tobjective");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}	

	if (!trim(participantId) || !(participantId > 0)){
		obj = document.getElementById("tresponsable");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	if (!trim(status) || !(status >= 0)){
		obj = document.getElementById("tstatus");
		obj.className = "add_error";
		alert(invalidDataMessage);
		return false;
	}
	
	return true;
}


function emailCheck(emailStr) {

/* 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. */
	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) {
			
		return false;
	   }
	}
	
	for (i=0; i<domain.length; i++) {
		
		if (domain.charCodeAt(i)>127) {
			
		return false;
	   }
	}
	
	// See if "user" is valid 
	
	if (user.match(userPat)==null) {
	// user is not 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) {
				
				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) {
			
		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) {
			
		return false;
	}
	
	// Make sure there's a host name preceding the domain.
	
	if (len<2) {
		
		return false;
	}

// If we've gotten this far, everything's valid!
return true;
}