/////////////
// language-dependent

var svMsgNoValue = "Please fill the fields with an asterisk."
var svMsgNoPassword = "Please fill the password field."
var svMsgNoChoice = "Please enter a choice.";
var svMsgNoEmail = "Email field not filled in."
var svMsgNoNumberType = "You have to enter a number"

var svMsgBadEmail = "Please enter a valid email address."
var svMsgBadConfirmPassword = "The password confirmation is not correct."
var svMsgBadValue = "incorrect value."
var svMsgBadDateFormat1 = "You must enter a valid date in this format : dd/mm/yyyy"

function f_svMsgPswdMinChars(VMax){ return "Your password must have at least " + VMax + " character(s).";}

/////////////

// trim - retire les espaces
function trim(value){
	startposn=0;
	while((value.charAt(startposn)==" ")&&(startposn<value.length)) {
		startposn++;
	}
	if(startposn==value.length) {
		value="";
	} else {
		value=value.substring(startposn,value.length);
		endposn=(value.length)-1;
		while(value.charAt(endposn)==" ") {
			endposn--;
		}
		value=value.substring(0,endposn+1);
	}
	return(value);
}

// test sur 2 champs dépendant
function Choix(champ1,champ2){
	if(( champ1.options[champ1.selectedIndex].value == "0") && (trim(champ2.value)== "")){
		alert(svMsgNoChoice);
		champ1.focus();
		return false;
	}
	return true;
}

// test réponse à 2 niveau, radio bouton + champ
function Niveau(champ1,champ2){
	if((champ1[0].checked))	{ return InputValidation(champ2,true,true,false,0);}
	return true;
}

// test password
function Passe(champ1,champ2,VMax){
	longueur=0
	chaine=trim(champ1.value)
	longueur=chaine.length
	if(longueur <VMax) {
		alert(f_svMsgPswdMinChars(VMax));
		champ1.value="";
		champ1.focus();
		return false;
	}

	if (trim(champ1.value)!=trim(champ2.value)) {
		alert(svMsgBadConfirmPassword);
		champ2.value="";
		champ2.focus();
		return false;}
		return true;
	}

// email address checkings
function CheckEmail(lemail)	{
	// si la valeur est nulle
	if (trim(lemail.value)==""){
		alert(svMsgNoEmail);
		lemail.focus();
		return false;
	}
	// si la valeur ne contient pas @
	if (lemail.value.indexOf("@")==-1){
		alert(svMsgBadEmail);
		lemail.focus();
		return false;
	}
	longueur = lemail.value.length;
	position = lemail.value.indexOf("@");
	left_str = lemail.value.substring(0,position);
	right_str = lemail.value.substring(position+1,longueur);
	left_len = left_str.length;
	right_len = right_str.length;

	// si la valeur gauche ou droite du @ est vide
	if ((left_len==0) || (right_len==0)){
		alert(svMsgBadEmail);
		lemail.focus();
		return false;
	}
	// s'il n'y a pas de point
	if (right_str.indexOf(".")==-1){
		alert(svMsgBadEmail);
		lemail.focus();
		return false;
	}
	right_longueur = right_str.length;
	right_position = right_str.lastIndexOf(".");
	l_right_str = right_str.substring(0,right_position);
	r_right_str = right_str.substring(right_position+1,right_longueur);
	l_right_len = l_right_str.length;
	r_right_len = r_right_str.length;

	// s'il y a au moins 2 lettres après le point
	if ((r_right_len < 2)||(r_right_len > 4)){
		alert(svMsgBadEmail);
		lemail.focus();
		return false;
	}
	// s'il y a au moins 1 lettre avant le point
	if (l_right_len==0){
		alert(svMsgBadEmail);
		lemail.focus();
		return false;
	}

	return true;
}

//Test champ exist ou vide
function InputValidation(champ,exist,isNumber,VMax,VMin){
	// exist	boolean 	pour verifier l'existence d"une valeur
	//VMax 	int		optionnel : valeur max à tester
	//VMin 	int		optionnel : valeur min à tester
	var ok = true;
	if(champ == null)
	return true;
	switch(champ.type){
		case 'text':
		case 'textarea':
		if(exist && trim(champ.value)== "") {
			alert(svMsgNoValue);
			champ.value = "";
			champ.focus();
			return false;
		}
		if(isNumber && isNaN(champ.value)){
			alert(svMsgNoNumberType);
			champ.value = "";
			champ.focus();
			return false;
		}
		if((VMax != "") && (champ.value > VMax)){
			alert(svMsgBadValue);
			champ.value = "";
			champ.focus();
			return false;
		}
		if((VMin != "") && (champ.value < VMin)){
			alert(svMsgBadValue);
			champ.value = "";
			champ.focus();
			return false;
		}
		break;
		case 'password':
		if(exist && trim(champ.value)== "") {
			alert(svMsgNoPassword);
			champ.value = "";
			champ.focus();
			return false;
		}
		break;
		case 'checkbox':
		if(exist && ! champ.checked) {
			alert(svMsgNoValue);
			champ.value = "";
			champ.focus();
			return false;
		}
		break;
		case 'select-one':
		if(exist && nbSelected(champ) == "0"){
			alert(svMsgNoValue);
			champ.focus();
			return false;
		}
		break;
		default :
	}
	return true;
}


// gets the number of non empty elements in a field
// of  type select-one or select-multiple
function nbSelected(Field) {
	var i, nbSelected = 0;
	for (i = 0; i < Field.options.length; i++) {
		if (Field.options[i].selected
		&& i != 0 && Field.options[i].text != '' && Field.options[i].text != ' ') {nbSelected++;};
	}
	return nbSelected;
}

// date/time management
function DateValidation(champ){
	var ok = false;
	if(champ == null){return true;}
	if(champ.value == ""){return true;}
	ok = isDate(champ);
	if(!ok) alert(svMsgBadDateFormat1);
	return ok;
}

function isDate (obj){
	var theString = new String(obj.value);
	var theTokens = theString.split('/');
	if ( theTokens.length < 3 || theTokens.length > 3 ){return false;};
	var tokenIndex;
	for ( tokenIndex = 0; tokenIndex < theTokens.length; tokenIndex++ ) {
		theTokens[tokenIndex] = new String(theTokens[tokenIndex])
		if ( theTokens[tokenIndex].charAt(0) == '0' )
		theTokens[tokenIndex] = theTokens[tokenIndex].substring(1, theTokens[tokenIndex].length);
	}
	var day = theTokens[0];
	var month = theTokens[1];
	var year = theTokens[2];
	// catch invalid years (not 2- or 4-digit) and invalid months and days.
	if (! (isYear(year) && isMonth(month, false) && isDay(day, false))) return false;

	var intYear = parseInt(year);
	var intMonth = parseInt(month);
	var intDay = parseInt(day);

	// catch invalid days, except for February
	if (intDay > daysInMonth[intMonth]) return false;

	if ((intMonth == 2) && (intDay > daysInFebruary(intYear))) return false;

	return true;
}

var daysInMonth = new Array(31,31,29,31,30,31,30,31,31,30,31,30,31);

function isYear (s)	{
	if(isNaN(s)){return false};
	if ((s.length == 2) || (s.length == 4)){	return true;};
	return false;
}

function isMonth (s){
	if(!isNaN(s)){ return isIntegerInRange (s, 1, 12);};
	return false;
}

function isDay (s){
	if( !isNaN(s)){ return isIntegerInRange (s, 1, 31);};
	return false
}

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
	// EXCEPT for centurial years which are not also divisible by 400.
	return (  ((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0) ) ) ? 29 : 28 );
}

function isIntegerInRange (s, a, b){
	var num = parseInt (s);
	return ((num >= a) && (num <= b));
}