// *********** general use functions

function openNewWindow(URL,title){
	window.open(URL,title,'location=no,menubar=no,toolbar=no,resizable=no,scrollbars=yes,width=1000,height=600');
}

//used for hidding/showing a block of text (used for example in Add type/status fora project)
function show_hide_block(block, button, text_visible, text_hide){

    //this is the ID of the hidden item
    var block = document.getElementById(block);

    //this is the ID of the show/hide button
    var button = document.getElementById(button);


    if (block.style.display != "none") {
        //items are currently displayed, so hide them
        block.style.display = "none";
        //and show the other image
        swapText(button,"hide", text_visible, text_hide);             
    }
    else {
        //items are currently hidden, so display them
        block.style.display = "block";
        //and show the other image
        swapText(button,"add", text_visible, text_hide);
         }

}


//function to swap the text 
function swapText(button, state, text_visible, text_hide) {

    if (state == "add") {
         button.innerHTML = text_visible;
    }

    else {
        button.innerHTML = text_hide;
    }
}



function $(ID){
	if(document.getElementById){
		return document.getElementById(ID);
	}
}


/**
 * getelementsByClass
 * @param {string, object, string} searchClass,node,tag 
 */
 function getElementsByClass(searchClass,node,tag) {

	var classElements = new Array();

	if ( node == null )
		node = document;

	if ( tag == null )
		tag = '*';

	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp('(^|\\s)'+searchClass+'(\\s|$)');
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
 }



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

/** adds an event handler to an event listener **/
function addEvent(obj, evType, fn){ 
	if(!obj){
		alert(this.addEvent.caller)
	}
	
	 if (obj.addEventListener){ 
	   obj.addEventListener(evType, fn, false); 
	   return true; 
	 } else if (obj.attachEvent){ 
	   var r = obj.attachEvent("on"+evType, fn); 
	   return r; 
	 } else { 
	   return false; 
	 } 
}


function removeEvent(obj, evType, fn){
	 if (obj.removeEventListener){ 
	   obj.removeEventListener(evType, fn, false); 
	   return true; 
	 } else if (obj.detachEvent){ 
	   var r = obj.detachEvent("on"+evType, fn); 
	   return r; 
	 } else { 
	   return false; 
	 } 
}


function getNextNode(currentNode){

	if(currentNode){
		if(currentNode.nextSibling && currentNode.nextSibling.nodeType == 1){
			return currentNode.nextSibling;
		}else{
			while(currentNode.nextSibling){
				currentNode = currentNode.nextSibling;
				if(currentNode.nextSibling && currentNode.nextSibling.nodeType == 1){
					return currentNode.nextSibling;
				}			
			}
			return null;
		}
	}else{
		return null;
	}
}



function getPreviousNode(currentNode){
	if(currentNode){
		if(currentNode.previousSibling && currentNode.previousSibling.nodeType == 1){
			return currentNode.previousSibling;
		}else{
			while(currentNode.previousSibling){
				currentNode = currentNode.previousSibling;
				if(currentNode.previousSibling && currentNode.previousSibling.nodeType == 1){
					return currentNode.previousSibling;
				}			
			}
			return null;
		}
	}else{
		return null;
	}
}


function hideEmailError(input){
	var emailErrorBr  = $('emailErrorBr');
	var emailErrorSpan= $('emailError')	;
	
	if(emailErrorBr){
		input.parentNode.removeChild(emailErrorBr);
	}
	
	if(emailErrorSpan){
		input.parentNode.removeChild(emailErrorSpan);
	}
	
}

/**
 * Checks if the number of users selected have room inside the project
 * selected is defined in inviteUser.php page
 */
function validateKnownUsers() {
	var obj = document.getElementById("knownUsersIds");
	var selected = 0;
	for (var i = 0; i < obj.options.length; i++) {
		if (obj.options[i].selected) {
			selected++;
		}
	}
	
	if (selected > slots) {
		alert(noSlotsMessage);
		return false;
	}
	return true;
}

function showEmailError(input){

	//input.style.borderColor = 'red';
	
	var br 			= document.createElement('br');
	var errorSpan 	= document.createElement('span');
	
	br.id						= 'emailErrorBr';
	
	errorSpan.id				= 'emailError';
	errorSpan.style.fontSize 	= '10px';
	errorSpan.style.fontWeight 	= 'lighter';
	errorSpan.style.color		= 'red';
	errorSpan.innerHTML 		= 'The email address "'+input.value+'" is taken!';
	
	input.parentNode.appendChild(br);
	input.parentNode.appendChild(errorSpan);
}


function showUserNameError(input){
	
	//input.style.borderColor = 'red';
	
	var br 			= document.createElement('br');
	var errorSpan 	= document.createElement('span');
	
	br.id						= 'userNameErrorBr';
	
	errorSpan.id				= 'userNameError';
	errorSpan.style.fontSize 	= '10px';
	errorSpan.style.fontWeight 	= 'lighter';
	errorSpan.style.color		= 'red';
	errorSpan.innerHTML 		= 'Sorry, the username "'+input.value+'" is taken!';
	
	input.parentNode.appendChild(br);
	input.parentNode.appendChild(errorSpan);
}


function hideUserNameError(input){
	var emailErrorBr  = $('userNameErrorBr');
	var emailErrorSpan= $('userNameError')	;
	
	if(emailErrorBr){
		input.parentNode.removeChild(emailErrorBr);
	}
	
	if(emailErrorSpan){
		input.parentNode.removeChild(emailErrorSpan);
	}

	//input.style.border	= '';
}


function emailCheck(emailStr,alertUser) {

	/* 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. */
		if(alertUser){
			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) {
				if(alertUser){
					alert("Ths username contains invalid characters.");
				}
				return false;
		   }
		}
		
		for (i=0; i<domain.length; i++) {
			if (domain.charCodeAt(i)>127) {
				if(alertUser){
					alert("Ths domain name contains invalid characters.");
				}
				return false;
		   }
		}
		
		// See if "user" is valid 
		
		if (user.match(userPat)==null) {
		// user is not valid
			if(alertUser){	
				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) {
					if(alertUser){
						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) {
				if(alertUser){
					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) {
			if(alertUser){
				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) {
			if(alertUser){
				alert("This address is missing a hostname!");
			}
			
			return false;
		}
	
	// If we've gotten this far, everything's valid!
	return true;
}