<?php
namespace Service;

use Psr\Cache\CacheItemPoolInterface;

use Carbon\Carbon;

class CacheDataProviderDecorator implements DataProviderInterface
{
    const EXPIRES_IN_DAYS = 1;

    private $cache;
    private $dataProvider;

    public function __construct(DataProviderInterface $dataProvider, CacheItemPoolInterface $cache)
    {
        $this->dataProvider = $dataProvider;
        $this->cache = $cache;
    }

    public function get(array $request)
    {
        $cacheKey = $this->cache->getCacheKey($request);
        $cacheItem = $this->cache->getItem($cacheKey);
        if ($cacheItem->isHit()) {
            return $cacheItem->get();
        }
        $result = $this->dataProvider->get($request);
        $cacheItem
            ->set($result)
            ->expiresAt(Carbon::now()->addDay(self::EXPIRES_IN_DAYS));

        return $result;
    }

    public function getCacheKey(array $request)
    {
        return md5(json_encode($request));
    }
}