<?php


class App_ECommerce_Cart_ItemObjFactory
{
    const CAPABILITY_CHANGE_QTY = 'changeQty';

    protected static $_itemCapabilitiesCache = [];

    /**
     * @param array $itemData
     *
     * @throws Qs_Exception
     * @return App_ECommerce_Cart_ItemInterface
     */
    public static function itemDataFactory(array $itemData)
    {
        return self::factory($itemData['cartItemType'], ['cartItemData' => $itemData]);
    }

    /**
     * @param string $cartItemType
     * @param array  $options
     *
     * @return App_ECommerce_Cart_ItemInterface
     * @throws Qs_Exception
     */
    public static function factory($cartItemType, $options = [])
    {
        $itemClass = Qs_SiteMap::getItemTypeClass($cartItemType, 'Obj');
        if (!class_exists($itemClass)) {
            throw new Qs_Exception('Can not create Cart Item Obj - class ' . $itemClass . ' does not exist');
        }
        return new $itemClass($options);
    }

    /**
     * @param string $itemType
     *
     * @throws Qs_Exception
     * @return array [capabilityName, ...]
     */
    public static function getItemCapabilities($itemType)
    {
        if (empty(static::$_itemCapabilitiesCache[$itemType])) {
            $itemClass = Qs_SiteMap::getItemTypeClass($itemType, 'Obj');
            if (!class_exists($itemClass)) {
                throw new Qs_Exception('Can not create Cart Item Obj - class ' . $itemClass . ' does not exist');
            }
            static::$_itemCapabilitiesCache[$itemType] = call_user_func([$itemClass, 'getCartItemCapabilities']);
        }
        return static::$_itemCapabilitiesCache[$itemType];
    }

}