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use h4kuna\Exchange;

$cache = new Caching\Cache('/temp/dir');
$exchange = new Exchange\Exchange($cache);

$exchange->setDefault('eur');
$exchange->setOutput('usd');

echo $exchange->change(100); // EUR -> USD = 125.0
echo $exchange->change(100, 'czk'); // CZK -> USD = 5.0
echo $exchange->change(100, NULL, 'czk'); // EUR -> CZK = 2500.0
echo $exchange->change(100, 'usd', 'czk'); // USD -> CZK = 2000.0

$exchange->setDriver(new Exchange\Driver\Cnb\Day, new \Datetime('2000-12-30'));

class MyDatabaseDriver extend \h4kuna\Exchange\Driver\ADriver 
{
    /**
     * Load data for iterator.
     * @param DateTime|NULL $date
     * @return array
     */
    protected function loadFromSource(DateTime $date = NULL)
    {
        // your implementation
        $this->setDate('Y-m-d', (string) $database->selectDate());
        return $database->fetchMyCurrencies();
    }

    /**
     * Modify data before save to cache.
     * @return Exchange\Currency\Property|NULL
     */
    protected function createProperty($row) 
    {
        return new \h4kuna\Exchange\Currency\Property([
            'code' => $row['currency'],
            'home' => $row['rate'],
            'foreign' => 1
        ]);
    }
}

$exchange->setDriver(new \MyDatabaseDriver);

$formats = new Exchange\Currency\Formats(new \h4kuna\Number\NumberFormatFactory());

$formats->addFormat('EUR', ['decimalPoint' => '.', 'unit' => '€']);

$filters = new Exchange\Filters($exchange, $formats);

// VAT 21%
$filters->setVat(new \h4kuna\Number\Tax(21));

// format 100 EUR like default to USD is set above
$filters->format(100); // '125,00 USD'

// count with VAT
$filters->formatVat(100, 'usd', 'eur'); // '96.80 €'
$filters->formatVatTo(100); // '151,25 USD'
$filters->formatTo(100, 'CZK'); // '2 000,00 CZK'

// Other options
$filters->change(100, 'usd', 'eur'); // 80.0
$filters->changeTo(100, 'usd'); // 125.0
$filters->vat(100); // 121.0

$exchange->addRate('usd', 23.0);
$exchange->change(1, 'usd', 'czk'); // 23.0

$exchange->removeRate('usd');
$exchange->change(1, 'usd', 'czk'); // 20.0

/* @var $property Exchange\Currenry\Property */
$property = $exchange['eur'];
var_dump($property);


foreach ($exchange as $code => $property) {
    /* @var $property Exchange\Currenry\Property */
    var_dump($property);
}

$cache = new Caching\Cache('/temp/dir');
$cache->setAllowedCurrencies(['CZK', 'USD', 'EUR']);
$exchange = new Exchange\Exchange($cache);

// in cache are only this three currencies
foreach ($exchange as $code => $property) {
    /* @var $property Exchange\Currenry\Property */
    var_dump($property);
}

$cookieManager = Exchange\Http\CookieManager($exchange);

$cookieManager->setCurrency($_GET['currency']);