var err="";
var manderr="";

function add_fields(title,named,typed,mandatoryd,lengthd)	{
	user_fields[title]=new Array;
	user_fields[title]['name']=named;
	user_fields[title]['type']=typed;
	user_fields[title]['mandatory'] = mandatoryd;
	user_fields[title]['length'] = lengthd||0;//0=do not check for length
}
function remove_field(title)	{
	if(user_fields[title]){
		user_fields[title]['mandatory']=0;
	}
}

function getKeyCode(e) {
	// for IE, we use e.keyCode
	if (window.event || !e.which)
	{
		return e.keyCode;
	}
	// for Netscape, we use e.which
	else if (e)
	{
		return e.which;
	}
	// otherwise, return 0
	return 0;
}

var lastValue;

// integer 

function constrain_integer(e) {
	var kc = getKeyCode(e);
	return kc >= 48 && kc <= 57;
}

function integer_validate_error(input, name) {
	if (input.value.length = 0 || (Math.round(input.value) != input.value)) {
		if(!err){
			input.focus();
		}
		err+="The " + name + " field has to be a whole number.\n";
	}
}

// float

function constrain_float(e) {
	var kc = getKeyCode(e);
	return constrain_integer(e) || kc == 46 || kc == 45;
}

function float_validate_error(input, name) {
	if (input.value.length = 0 || (input.value*1 != input.value)) {
		if(!err){
			input.focus();
		}
		err+="The " + name + " field has to be a number.\n";
	}
}

// decimal

function constrain_decimal(e) {
	return constrain_float(e);
}

function decimal_validate_error(input, name) {
	var rexp = /^[\-\+]?[0-9]+(\.[0-9][0-9]?)?$/;
	if (!rexp.test(input.value)) {
		if(!err){
			input.focus();
		}
		err+="The " + name + " field has to be a number specified to 2 decimal places.\n";
	}
}

// alphanumeric

function constrain_alphanumeric(e) {
	var kc = getKeyCode(e);
	return constrain_integer(e) || (kc >= 65 && kc <= 90)
		|| (kc >= 97 && kc <= 122) || (kc == 95);
}

function alphanumeric_validate_error(input, name) {
}

// email

function constrain_email(e) {
	var kc = getKeyCode(e);
	return constrain_alphanumeric(e) || kc == 45 || kc == 46 || kc == 64;
}

function email_validate_error(input, name) {
	var test = (input.value);
	var email = /^([\w-.]+)\@(([\w-])+\.)+([a-z]{2,4})$/i;
	var emailvalidate = test.match(email);
	if(!emailvalidate)	{
		if(!err){
			input.focus();
		}
		err+="The " + name + " field has to be an email address of the form aaa@bbb.ccc\n";
	}

}

// url

var URLchars = "#%&-./:?~=+;"

function constrain_url(e) {
	var kc = getKeyCode(e);
	for (var i=0; i<URLchars.length; i++) {
		if (kc == URLchars.charCodeAt(i)) { return true; }
	}
	return constrain_alphanumeric(e);
}

function url_validate_error(input, name) {
	if (Math.round(input.value*100) != input.value * 100) {
		if(!err){
			input.focus();
		}
		err+="The " + name + " field has to be a number specified to 2 decimal places.\n";
	}
//	return '';
}

// password

function password_validate_error(input, name) {
	var confirmInput = input.form[input.name+'_CONFIRM'];
	if (!confirmInput) {
		if(!err){
			input.focus();
		}
		input.value='';
		err+="You cannot change the " + input.name + " field on this page.\n";
	}
	if(input.value==""){
		if(!err){
			input.focus();
		}
		err+="The " + input.name + " fields is empty. Please enter a " + input.name +"\n" ;
	}
	else if (input.value != confirmInput.value) {
		if(!err){
			input.focus();
		}
		input.value = '';
		confirmInput.value = '';
		err+="The " + input.name + " fields do not match. Please retype " + input.name +"\n" ;
	}
	return '';
}

// form validation

var validators = new Array;
validators['integer'] = integer_validate_error;
validators['email'] = email_validate_error;
validators['float'] = float_validate_error;
validators['alphanumeric'] = alphanumeric_validate_error;
validators['decimal'] = decimal_validate_error;
validators['password'] = password_validate_error;

var constrained = new Array;
constrained['integer'] = 1;
constrained['email'] = 1;
constrained['float'] = 1;
constrained['alphanumeric'] = 1;
constrained['decimal'] = 1;
constrained['url'] = 1;

function validateForm(form, metadata) {
	err="";
	manderr="";
	for (var i=0; i<form.elements.length; i++) {
		var el = form.elements[i];
		var el_metadata = metadata[el.name];
		var value = el.value;
		if (el.type == 'select-one' || el.type == 'select-multiple') { 
			value = '';
			if (el.selectedIndex >= 0) {
				value = el.options[el.selectedIndex].value;
			}
		}
		else if (el.type == 'checkbox') { value = el.checked }
		if ((el_metadata)) {
			if((el_metadata['length']>0)&& (value!='')&&(el_metadata['type']=='short_text')){
				var thislen=el.value.length;
				var testlen = el_metadata['length'];
				if(thislen>testlen){
					if(!err){
						el.focus();
					}
					err+="The field " + el_metadata['name'] + " is too long, please reduce the content\n";
					//return false;
				}
			}
			if ((el_metadata['mandatory']) && (value=='') && (el.type!='password')) {
				 if(!err&&!manderr){
						el.focus();
					}
				manderr+=" - " + el_metadata['name'] + "\n";
				//return false;
			}
			var validator = validators[el_metadata['type']];
			if ((validator)) {
			 	var valerr = validator(el, el_metadata['name']);				
			// 	if (valerr) {
			//		a(err);
			//		el.focus();
				//	return false;
			//	}
			}
		}
	}
	if(manderr){
		err+="You have not filled in the mandatory field:\n"+manderr
		}
	if(err){
		alert(err);
	return false;	
	}
	//return true;
}

function constrainFormInputs(form, metadata) {
	for (var i=0; i<form.elements.length; i++) {
		var el = form.elements[i];
		var el_metadata = metadata[el.name];
		if ((el_metadata)) {
			if (constrained[el_metadata['type']]) {
				el.onkeypress = new Function('return constrain_' + el_metadata['type'] + '(event)');
			}
		}
	}
}