'use strict';

// Prototype Object Builder
//  1. Utility Function used to make Prototypal Inheritance easier to accomplish in one action
//  2. Use by passing in a useful base Object which you want to use as the prototype for the new Object
function objectBuilder (protoObject){
    var F = function(){};
    F.prototype = protoObject;
    return new F();
}

// All Objects are linked to a Prototype Object
// 1. All objects created via Literals are linked to Object.prototype by default
// 2. The prototype link is unidirectional, properties of the prototype object are pulled down by the inheriting object
// 3. Updating does not affect the Prototype object since the link is unidirectional
// 4. Augmentation of the Prototype object (adding properties/methods) is instantly available to all inheriting objects

//---------------------------------------------//

// Useful Object for Prototyping purposes
var personPrototype = {
    firstName: 'First name not provided',
    middleInitial: 'initial not provided',
    lastName: 'Last name not provided',
    age: 'Age not provided',
    sayYourName: function(){
        return "Hello, I am " + this.firstName + " " + this.lastName;
    }
};

// Creating custom Person Object from Person Prototype
var tim = objectBuilder(personPrototype);

//---------------------------------------------//

// Displaying that the new Tim Person Object has inherited
// the variables of the Prototype Object
console.log(tim.firstName);
tim.firstName = 'Timothy';
console.log(tim.firstName);

console.log(tim.middleInitial);
tim.middleInitial = 'L';
console.log(tim.middleInitial);

console.log(tim.lastName);
tim.lastName = 'Clark';
console.log(tim.lastName);

//---------------------------------------------//

// Displaying that the new Tim Person Object has inherited
// the functions of the Prototype Object
console.log(tim.sayYourName());

// Adding variables or functions to the Prototype are
// instantly available to inheriting Objects
personPrototype.walk = function(){
    return "Walk, walk, walk...";
};
// Prototype Object now has method
console.log(personPrototype.walk());
// Inherited Object now has method
console.log(tim.walk());

//---------------------------------------------//

// Displaying that augmenting the inherited Object
// does not affect the linked Prototype object
tim.run = function(){
    return "I'm running around like a chicken with its head cut off.";
};
tim.hairColor = "brown";
// Inherited Object now has the new Function
console.log(tim.run());
console.log(tim.hairColor);
// Prototype Object is NOT affected
try{
    console.log(personPrototype.run()); // Returns an error, function does not exist
}catch(error){
    console.log("personPrototype: " + error.message);
}
console.log(personPrototype.hairColor); // Returns undefined, value does not exist

//---------------------------------------------//

// Displaying that changing the values of the Prototype Object's variables does not affect the inheriting Objects
personPrototype.firstName = 'WOOO HOOO';
console.log(personPrototype.firstName);
console.log(tim.firstName);