class Session

class Session implements FlashBagAwareSessionInterface, \IteratorAggregate, \Countable {
    protected SessionStorageInterface $storage;
    private string $flashName;
    private string $attributeName;
    private array $data = [];
    private int $usageIndex = 0;
    private ?\Closure $usageReporter;
    public function __construct(?SessionStorageInterface $storage = null, ?AttributeBagInterface $attributes = null, ?FlashBagInterface $flashes = null, ?callable $usageReporter = null) {
        $this->storage = $storage ?? new NativeSessionStorage();
        $this->usageReporter = null === $usageReporter ? null : $usageReporter(...);
        $attributes ??= new AttributeBag();
        $this->attributeName = $attributes->getName();
        $this->registerBag($attributes);
        $flashes ??= new FlashBag();
        $this->flashName = $flashes->getName();
        $this->registerBag($flashes);
    }
    public function start() : bool {
        return $this->storage
            ->start();
    }
    public function has(string $name) : bool {
        return $this->getAttributeBag()
            ->has($name);
    }
    public function get(string $name, mixed $default = null) : mixed {
        return $this->getAttributeBag()
            ->get($name, $default);
    }
    public function set(string $name, mixed $value) : void {
        $this->getAttributeBag()
            ->set($name, $value);
    }
    public function all() : array {
        return $this->getAttributeBag()
            ->all();
    }
    public function replace(array $attributes) : void {
        $this->getAttributeBag()
            ->replace($attributes);
    }
    public function remove(string $name) : mixed {
        return $this->getAttributeBag()
            ->remove($name);
    }
    public function clear() : void {
        $this->getAttributeBag()
            ->clear();
    }
    public function isStarted() : bool {
        return $this->storage
            ->isStarted();
    }
    
    /**
     * Returns an iterator for attributes.
     *
     * @return \ArrayIterator<string, mixed>
     */
    public function getIterator() : \ArrayIterator {
        return new \ArrayIterator($this->getAttributeBag()
            ->all());
    }
    
    /**
     * Returns the number of attributes.
     */
    public function count() : int {
        return \count($this->getAttributeBag()
            ->all());
    }
    public function &getUsageIndex() : int {
        return $this->usageIndex;
    }
    
    /**
     * @internal
     */
    public function isEmpty() : bool {
        if ($this->isStarted()) {
            ++$this->usageIndex;
            if ($this->usageReporter && 0 <= $this->usageIndex) {
                ($this->usageReporter)();
            }
        }
        foreach ($this->data as &$data) {
            if ($data) {
                return false;
            }
        }
        return true;
    }
    public function invalidate(?int $lifetime = null) : bool {
        $this->storage
            ->clear();
        return $this->migrate(true, $lifetime);
    }
    public function migrate(bool $destroy = false, ?int $lifetime = null) : bool {
        return $this->storage
            ->regenerate($destroy, $lifetime);
    }
    public function save() : void {
        $this->storage
            ->save();
    }
    public function getId() : string {
        return $this->storage
            ->getId();
    }
    public function setId(string $id) : void {
        if ($this->storage
            ->getId() !== $id) {
            $this->storage
                ->setId($id);
        }
    }
    public function getName() : string {
        return $this->storage
            ->getName();
    }
    public function setName(string $name) : void {
        $this->storage
            ->setName($name);
    }
    public function getMetadataBag() : MetadataBag {
        ++$this->usageIndex;
        if ($this->usageReporter && 0 <= $this->usageIndex) {
            ($this->usageReporter)();
        }
        return $this->storage
            ->getMetadataBag();
    }
    public function registerBag(SessionBagInterface $bag) : void {
        $this->storage
            ->registerBag(new SessionBagProxy($bag, $this->data, $this->usageIndex, $this->usageReporter));
    }
    public function getBag(string $name) : SessionBagInterface {
        $bag = $this->storage
            ->getBag($name);
        return method_exists($bag, 'getBag') ? $bag->getBag() : $bag;
    }
    
    /**
     * Gets the flashbag interface.
     */
    public function getFlashBag() : FlashBagInterface {
        return $this->getBag($this->flashName);
    }
    
    /**
     * Gets the attributebag interface.
     *
     * Note that this method was added to help with IDE autocompletion.
     */
    private function getAttributeBag() : AttributeBagInterface {
        return $this->getBag($this->attributeName);
    }

}