icaroerasmo

var replaceUnit = function(str, index, replacement) {
    return str.substr(0, index) + replacement+ str.substr(index + replacement.length);
}

var replaceDateUnit = function(txtDate, unit, dateFormatReturn, pattern){
	var index = pattern.indexOf(unit);
	var replacementIndex = dateFormatReturn.indexOf(unit);
	var strResult = "";

	if(index > -1 && txtDate.length > index){
		strResult = replaceUnit(dateFormatReturn,
				replacementIndex, txtDate.substr(index, unit.length));
	}
	return strResult;
};

var parseDate = function(dataText, dateFormatReturn, pattern){
	var newDataText = replaceDateUnit(dataText, "dd", dateFormatReturn, pattern);
	newDataText = replaceDateUnit(dataText, "MM", newDataText, pattern);
	newDataText = replaceDateUnit(dataText, "yyyy", newDataText, pattern);
	return newDataText;
};

var getAge = function(parsedDate){
	var millis = new Date() - parsedDate;
	return millis / 31536000000;
}

var testData = function(birthDate, _minorDate, _majorDate,
	 _successCode, _errorCodeGeneric, _errorCodeNotAllowed){

	if(isNaN(birthDate)){
		return _errorCodeGeneric;
	}

	var age = getAge(birthDate);

	if(age < _minorDate || age > _majorDate){
		return _errorCodeNotAllowed;
	}

	return _successCode;
};

var transformDate = function(_textBirthDate, _dateFormatReturn){
	var iYear = _dateFormatReturn.indexOf("yyyy");
	var iMonth = _dateFormatReturn.indexOf("MM");
	var iDay = _dateFormatReturn.indexOf("dd");

	var year = _textBirthDate.substring(iYear, iYear+4);
	var month = _textBirthDate.substring(iMonth, iMonth+2);
	var day = _textBirthDate.substring(iDay, iDay+2);

	return new Date(year+"-"+month+"-"+day);
};

var validaData = function(data, dateFormatReturn, dateTextFormat, minorDate, majorDate,
	 successCode, errorCodeGeneric, errorCodeNotAllowed){

		var textBirthDate = parseDate(data, dateFormatReturn, dateTextFormat);

		var birthDate = transformDate(textBirthDate, dateFormatReturn);

		var status = testData(birthDate, minorDate, majorDate,
		 successCode, errorCodeGeneric, errorCodeNotAllowed);

		var response = '<root>'+
					   '    <body>'+
					   '        <status>'+status+'</status>';
		if(status != errorCodeGeneric){
			response += '		 <formattedDate>'+textBirthDate+'</formattedDate>';
		}

		response += '    </body>'+
					'</root>';


		return response;
};
validaData(data, dateFormatReturn, dateTextFormat, minorDate, majorDate, successCode, errorCodeGeneric, errorCodeNotAllowed);