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<?php
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namespace Kevinrob\GuzzleCache\Storage;
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use Psr\Cache\CacheItemInterface;
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use Psr\Cache\CacheItemPoolInterface;
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use Kevinrob\GuzzleCache\CacheEntry;
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class Psr6CacheStorage implements CacheStorageInterface
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{
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    /**
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     * The cache pool.
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     *
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     * @var CacheItemPoolInterface
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     */
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    protected $cachePool;
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    /**
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     * The last item retrieved from the cache.
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     *
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     * This item is transiently stored so that save() can reuse the cache item
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     * usually retrieved by fetch() beforehand, instead of requesting it a second time.
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     *
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     * @var CacheItemInterface|null
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     */
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    protected $lastItem;
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    /**
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     * @param CacheItemPoolInterface $cachePool
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     */
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    public function __construct(CacheItemPoolInterface $cachePool)
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    {
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        $this->cachePool = $cachePool;
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function fetch($key)
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    {
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        $item = $this->cachePool->getItem($key);
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        $this->lastItem = $item;
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        $cache = $item->get();
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        if ($cache instanceof CacheEntry) {
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            return $cache;
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        }
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        return null;
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    }
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    /**
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     * {@inheritdoc}
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     */
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    public function save($key, CacheEntry $data)
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    {
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        if ($this->lastItem && $this->lastItem->getKey() == $key) {
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            $item = $this->lastItem;
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        } else {
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            $item = $this->cachePool->getItem($key);
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        }
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        $this->lastItem = null;
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        $item->set($data);
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        $ttl = $data->getTTL();
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        if ($ttl === 0) {
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            // No expiration
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            $item->expiresAfter(null);
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        } else {
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            $item->expiresAfter($ttl);
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        }
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        return $this->cachePool->save($item);
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    }
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    /**
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     * @param string $key
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     *
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     * @return bool
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     */
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    public function delete($key)
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    {
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        if (null !== $this->lastItem && $this->lastItem->getKey() === $key) {
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            $this->lastItem = null;
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        }
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        return $this->cachePool->deleteItem($key);
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    }
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}