';
//        var_dump($set->toArray());
//        exit;

        $currentBalance = $startBalance;
        /** @var Transaction $entry */
        foreach ($set as $entry) {
            // normal amount and foreign amount
            $modified        = is_null($entry->modified) ? '0' : strval($entry->modified);
            $foreignModified = is_null($entry->modified_foreign) ? '0' : strval($entry->modified_foreign);
            $amount          = '0';
            if ($currencyId === $entry->transaction_currency_id) {
                // use normal amount:
                $amount = $modified;
            }
            if ($currencyId === $entry->foreign_currency_id) {
                // use normal amount:
                $amount = $foreignModified;
            }

            $currentBalance  = bcadd($currentBalance, $amount);
            $carbon          = new Carbon($entry->date);
            $date            = $carbon->format('Y-m-d');
            $balances[$date] = $currentBalance;
        }

        $cache->store($balances);

        return $balances;


    }

    /**
     * This method always ignores the virtual balance.
     *
     * @param \Illuminate\Support\Collection $accounts
     * @param \Carbon\Carbon                 $date
     *
     * @return array
     */
    public function balancesByAccounts(Collection $accounts, Carbon $date): array
    {
        $ids = $accounts->pluck('id')->toArray();
        // cache this property.
        $cache = new CacheProperties;
        $cache->addProperty($ids);
        $cache->addProperty('balances');
        $cache->addProperty($date);
        if ($cache->has()) {
            //return $cache->get(); // @codeCoverageIgnore
        }

        // need to do this per account.
        $result = [];
        /** @var Account $account */
        foreach ($accounts as $account) {
            $result[$account->id] = $this->balance($account, $date);
        }

        $cache->store($result);

        return $result;
    }

    /**
     * @param int $isEncrypted
     * @param     $value
     *
     * @return string
     */
    public function decrypt(int $isEncrypted, string $value)
    {
        if ($isEncrypted === 1) {
            return Crypt::decrypt($value);
        }

        return $value;
    }

    /**
     * @param array $accounts
     *
     * @return array
     */
    public function getLastActivities(array $accounts): array
    {
        $list = [];

        $set = auth()->user()->transactions()
                     ->whereIn('transactions.account_id', $accounts)
                     ->groupBy(['transactions.account_id', 'transaction_journals.user_id'])
                     ->get(['transactions.account_id', DB::raw('MAX(transaction_journals.date) AS max_date')]);

        foreach ($set as $entry) {
            $list[intval($entry->account_id)] = new Carbon($entry->max_date);
        }

        return $list;
    }

    /**
     * @param $string
     *
     * @return int
     */
    public function phpBytes($string): int
    {
        $string = strtolower($string);

        if (!(stripos($string, 'k') === false)) {
            // has a K in it, remove the K and multiply by 1024.
            $bytes = bcmul(rtrim($string, 'kK'), '1024');

            return intval($bytes);
        }

        if (!(stripos($string, 'm') === false)) {
            // has a M in it, remove the M and multiply by 1048576.
            $bytes = bcmul(rtrim($string, 'mM'), '1048576');

            return intval($bytes);
        }

        if (!(stripos($string, 'g') === false)) {
            // has a G in it, remove the G and multiply by (1024)^3.
            $bytes = bcmul(rtrim($string, 'gG'), '1073741824');

            return intval($bytes);
        }

        return intval($string);


    }

    // parse PHP size:

    /**
     * @param string $amount
     *
     * @return string
     */
    public function positive(string $amount): string
    {
        if (bccomp($amount, '0') === -1) {
            $amount = bcmul($amount, '-1');
        }

        return $amount;
    }

}