//persons module
persons = (function(){

    //private Person object constructor
    var Person = function(firstName, lastName, birthDate){    
        var foo = "bar";
    
        var name = function(){
            return firstName + " " + lastName;
        }
    
        var age = function(){
            var currentYear = (new Date()).getYear()
            var birthDayYear = birthDate.getYear()
            
            return currentYear - birthDayYear      
        }
    
        var saySomething = function(){
            return foo;
        }
        
        //the methods that will be public
        return {
            "name": name,
            "age": age,
            "saySomething": saySomething
        }
    }
    
    //private FitnessAddict object constructor
    var FitnessAddict = function(firstName, lastName, birthDate, weight, height){        
        var person = Person(firstName, lastName, birthDate);
        
        var bmi = function(){
            return weight / (height*height);
        }
        
        var isWeightNormal = function(){
            var currentBmi = bmi()
            if(currentBmi > 25){
                return false
            }
            if(currentBmi < 18.5){
                return false
            }
            return true
        }
        
        //we make isWeightNormal method public
        person.isWeightNormal = isWeightNormal;
        
        return person;   
    }

    //we make the fitnessAddict object constructor public
    return {
        "fitnessAddict": FitnessAddict
    }
})()