}

        return false;
    }

    /**
     * Removes a configuration key.
     *
     * @param string $key
     *
     * @return self
     */
    public function remove($key)
    {
        $success = \Configuration::deleteByName(
            $key
        );

        if (!$success) {
            throw new \Exception('Could not update configuration');
        }

        return $this;
    }

    /**
     * Unset configuration value.
     *
     * @param string $key
     *
     * @return void
     *
     * @throws \Exception
     *
     * @deprecated since version 1.7.4.0
     */
    public function delete($key)
    {
        $this->remove($key);
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator()
    {
        return new \ArrayIterator($this->all());
    }

    /**
     * {@inheritdoc}
     */
    public function count()
    {
        return count($this->all());
    }

    /**
     * Return if Feature feature is active or not.
     *
     * @return bool
     */
    public function featureIsActive()
    {
        return Feature::isFeatureActive();
    }

    /**
     * Return if Combination feature is active or not.
     *
     * @return bool
     */
    public function combinationIsActive()
    {
        return Combination::isFeatureActive();
    }

    /**
     * Restrict updates of a piece of configuration to a single shop.
     *
     * @param Shop $shop
     */
    public function restrictUpdatesTo(Shop $shop)
    {
        $this->shop = $shop;
    }

    /**
     * Get localized configuration in all languages
     *
     * @param string $key
     * @param int|null $shopId
     * @param int|null $shopGroupId
     *
     * @return array Array of langId => localizedConfiguration
     */
    private function getLocalized($key, ?int $shopId = null, ?int $shopGroupId = null)
    {
        $configuration = [];

        foreach (Language::getIDs(false, $shopId ?: false) as $langId) {
            $configuration[$langId] = ConfigurationLegacy::get($key, $langId, $shopGroupId, $shopId);
        }

        return $configuration;
    }

    /**
     * @param ShopConstraint $shopConstraint
     *
     * @return int|null
     */
    private function getShopId(ShopConstraint $shopConstraint): ?int
    {
        return null !== $shopConstraint->getShopId()
            ? $shopConstraint->getShopId()->getValue()
            : null
        ;
    }

    /**
     * @param ShopConstraint $shopConstraint
     *
     * @return int|null
     */
    private function getShopGroupId(ShopConstraint $shopConstraint): ?int
    {
        if (null !== $shopConstraint->getShopGroupId()) {
            return $shopConstraint->getShopGroupId()->getValue();
        } elseif (null !== $shopConstraint->getShopId()) {
            $shopGroupId = Shop::getGroupFromShop((int) $shopConstraint->getShopId()->getValue(), true);
            // $shopGroupId can not be false, it would mean that the shop group was not found for the given shop
            if ($shopGroupId === false) {
                throw new ShopException(
                    sprintf(
                        'Shop group was not found for the shop with id %d.',
                        $shopConstraint->getShopId()->getValue()
                    )
                );
            }

            return (int) $shopGroupId;
        }

        return null;
    }

    /**
     * @param string $key
     * @param ShopConstraint $shopConstraint
     */
    public function deleteFromContext(string $key, ShopConstraint $shopConstraint): void
    {
        $shopId = $shopConstraint->getShopId();
        $shopGroupId = $shopConstraint->getShopGroupId();

        ConfigurationLegacy::deleteFromContext(
            $key,
            !empty($shopGroupId) ? $shopGroupId->getValue() : null,
            !empty($shopId) ? $shopId->getValue() : null
        );
    }

    /**
     * @return ShopConstraint
     */
    private function buildShopConstraintFromContext(): ShopConstraint
    {
        @trigger_error(
            'Not specifying the optional ShopConstraint parameter is deprecated since version 1.7.8.0',
            E_USER_DEPRECATED
        );

        if (Shop::getContext() === Shop::CONTEXT_SHOP) {
            return ShopConstraint::shop(Shop::getContextShopID());
        } elseif (Shop::getContext() === Shop::CONTEXT_GROUP) {
            return ShopConstraint::shopGroup(Shop::getContextShopGroupID());
        }

        return ShopConstraint::allShops();
    }

    /**
     * @param string $key
     * @param ShopConstraint $shopConstraint
     *
     * @return mixed
     */
    private function getStrictValue(string $key, ShopConstraint $shopConstraint)
    {
        if (null !== $shopConstraint->getShopId()) {
            $hasKey = ConfigurationLegacy::hasKey($key, null, null, $shopConstraint->getShopId()->getValue());

            return $hasKey ? ConfigurationLegacy::get($key, null, null, $shopConstraint->getShopId()->getValue()) : null;
        }

        if (null !== $shopConstraint->getShopGroupId()) {
            $hasKey = ConfigurationLegacy::hasKey($key, null, $shopConstraint->getShopGroupId()->getValue());

            return $hasKey ? ConfigurationLegacy::get($key, null, $shopConstraint->getShopGroupId()->getValue()) : null;
        }

        if (ConfigurationLegacy::hasKey($key)) {
            return ConfigurationLegacy::get($key);
        }

        return null;
    }
}