<?php

// TODO: YOUR CODE HERE 

// Exercise 1 

$cart = new ShoppingCart();
$cart->add('milk', 1);
$cart->add('bread', 1);
$cart->add('basil', 1);
$cart->add('milk', 1);
$cart->remove('basil');
print($cart);

// Exercise 2

print("Content:\n");
$cart['apple'] = 2;
++$cart['apple'];
foreach($cart as $name => $count) {
	print( "  $name : $count\n");
}

// Exercise 3

print("JSON\n");
print(createWriter("json")->write($cart));
print("\n\nSTRING\n");
print(createWriter("string")->write($cart));
print("\n");

// Exercise 4

print("Monitoring ...\n");

// Basic.
$monitor = CollectStatistics::wrap($cart);
$monitor['wrap']->add('tomato', 1);
$monitor['wrap']->add('tomato', 1);
$monitor['wrap']->add('orange', 1);
$monitor['wrap']->remove('bread');
$monitor['wrap']->printStatistics();

// Intermediate.
// $monitor = CollectStatistics::wrap($cart);
// $monitor['wrap']->add('tomato', 1);
// $monitor['wrap']->add('tomato', 1);
// $monitor['wrap']->add('orange', 1);
// $monitor['wrap']->remove('bread');
// print_r($monitor['statistics']);

// Advanced - require more references.
// [
// 	'wrap' => $monitoredCart, 
// 	'statistics' => &$statistics
// ] = CollectStatistics::wrap($cart);
// $monitoredCart->add('tomato', 1);
// $monitoredCart->add('tomato', 1);
// $monitoredCart->add('orange', 1);
// $monitoredCart->remove('bread');
// print_r($statistics);

/*
Expected output:

Content:
  milk : 2
  bread : 1
  
Content:
  milk : 2
  bread : 1
  apple : 3

JSON
{"milk":2,"bread":1,"apple":3}

STRING
Concent:
  milk : 2
  bread : 1
  apple : 3
  
Usage:
Array
(
    [add] => 3
    [remove] => 1
)
  
*/