<?php

class Model
{

    protected $db;

    function __construct($db)
    {
        $this->db = $db;
    }

}

class Player extends Model
{

    private $id;

    function __construct($id, $db)
    {
        parent::__construct($db);
        $this->id = $id;
    }

}

class Item extends Model
{

    private $id;
    private $data = array();

    function __construct($id, $db)
    {
        parent::__construct($db);
        $this->id = $id;
    }

}

class PlayerFactory
{

    private $db;

    function create($id)
    {
        return new Player($id, $this->db);
    }

}

class ItemFactory
{

    private $db;

    function create($id)
    {
        return new Item($id, $this->db);
    }

}

class Relation
{

    private $classes = array();
    protected $db;

    function __construct($db)
    {
        $this->db = $db;
    }

    function __set($k, $v)
    {
        $this->classes[$k] = $v;
    }

    function __get($k)
    {
        return $this->classes[$k];
    }


}


class RelationPlayerItem extends Service
{

    function buyItem()
    {
        if ($this->player->money < $item->price) {
            throw new Exception("not enough money");
        }

        $this->db->beginTransaction();
        $this->player->subtractMoney();
        $this->item->changeOwner($this->player);
        $this->db->commit();
    }


}


class Presenter
{

    // obě proměnné umí Nette automaticky vytvořit
    private $playerFactory;
    private $itemFactory;

    protected $player;

    // startup se zavolá jako první a slouží pro inicializaci vlastnostní
    public function startup()
    {
        // $this->user->id je v Nette ID přihlášeného uživatele
        $this->player = $this->playerFactory->create($this->user->id);
    }

    private function createRelation($name)
    {
        $class = "Relation" . ucFirst($name);

        return new $class($this->context->getService("db"));
    }

    function handleBuyItem($id)
    {
        $relation = $this->createRelation("playerItem");
        $relation->player = $this->player;
        $relation->item = $this->itemFactory->create($id);

        try {
            $relation->buyItem();
        } catch (Exception $e) {
            $this->flashMessage($e->getMessage());
            $this->redirect("default");
        }
    }

}