A client, a barman, an order, and some beer!

gistfile1.php

<?php

class drink
{
	private $alcool = '';
	private $pourcent = 0;

	public function __construct($alcool, $pourcent)
	{
		$this
			->setAlcool($alcool)
			->setPourcent($pourcent)
		;
	}

	public function __toString()
	{
		return $this->alcool . ': ' . $this->pourcent . '%';
	}

	public function setPourcent($pourcent)
	{
		$this->pourcent = $pourcent;

		return $this;
	}

	public function setAlcool($alcool)
	{
		$this->alcool = $alcool;

		return $this;
	}
}

class drinks implements iteratorAggregate
{
	private $drinks = array();

	public function destroy()
	{
		$this->drinks = array();
	}

	public function add(drink $drink)
	{
		$this->drinks[] = $drink;

		return $this;
	}

	public function getIterator()
	{
		return new arrayIterator($this->drinks);
	}
}

class order
{
	private $numberOfDrinks = 0;
	private $alcool = '';

	public function setNumberOfDrinks($numberOfDrinks)
	{
		$this->numberOfDrinks = $numberOfDrinks;

		return $this;
	}

	public function getNumberOfDrinks()
	{
		return $this->numberOfDrinks;
	}

	public function setAlcool($alcool)
	{
		$this->alcool = $alcool;

		return $this;
	}

	public function getAlcool()
	{
		return $this->alcool;
	}
}

class client
{
	private $drinks = array();
	private $creditCardNumber = '';
	private $order = null;

	public function __construct()
	{
		$this->creditCardNumber = uniqid();
		$this->order = new order();
	}

	public function order($numberOfDrinks, $alcool)
	{
		return $this->order
			->setNumberOfDrinks($numberOfDrinks)
			->setAlcool($alcool)
		;
	}

	public function updateOrder($numberOfDrinks, $alcool)
	{
		$this->order($numberOfDrinks, $alcool);

		return $this;
	}

	public function receiveDrinks(drinks $drinks)
	{
		$this->drinks = $drinks;

		return $this;
	}

	public function getCreditCardNumber()
	{
		return $this->creditCardNumber;
	}

	public function showDrinks()
	{
		foreach ($this->drinks as $drink)
		{
			echo $drink . PHP_EOL;
		}

		return $this;
	}
}

class tpe
{
	private $creditCardNumber = '';
	private $price = 0;

	public function setCreditCardNumber($creditCardNumber)
	{
		$this->creditCardNumber = $creditCardNumber;

		return $this;
	}

	public function setPrice($price)
	{
		$this->price = $price;

		return $this;
	}

	public function executeTransaction()
	{
		echo 'Just pay ' . $this->price . ' with card ' . $this->creditCardNumber . '!' . PHP_EOL;

		return $this;
	}
}

class barman
{
	private $order = null;
	private $drinks = null;

	public function receiveOrder(order $order)
	{
		$this->order = $order;

		return $this;
	}

	public function prepareOrder()
	{
		$this->drinks = new drinks();

		for ($numberOfDrinks = $this->order->getNumberOfDrinks(); $numberOfDrinks > 0; $numberOfDrinks--)
		{
			$this->drinks->add(new drink($this->order->getAlcool(), 75));
		}

		return $this;
	}

	public function giveDrinks()
	{
		return $this->drinks;
	}

	public function updateDrinks()
	{
		foreach ($this->drinks as $drink)
		{
			$drink
				->setAlcool('1664')
				->setPourcent(10)
			;
		}

		return $this;
	}

	public function billDrinks($client)
	{
		$tpe = new tpe();

		$tpe
			->setPrice($this->order->getNumberOfDrinks() * 6)
			->setCreditCardNumber($client->getCreditCardNumber())
			->executeTransaction()
		;

		return $this;
	}
}