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<?php
namespace Net\Bazzline\UniqueNumberRepository\Application\Service;
use Net\Bazzline\UniqueNumberRepository\Domain\Model\UniqueNumberRequest;
use Net\Bazzline\UniqueNumberRepository\Infrastructure\Storage\UniqueNumberStorage;
class NumberEnumerator
{
private $storage;
public function __construct(UniqueNumberStorage $storage)
{
$this->storage = $storage;
}
public function increment($repositoryName)
{
$storage = $this->storage;
$collection = $this->fetchCollection($storage, $repositoryName);
$numbers = $this->fetchNumbersFromCollection($collection);
$orderedNumbers = $this->orderNumbers($numbers);
$freeNumber = $this->calculateFreeNumber($orderedNumbers);
return $freeNumber;
}
private function fetchCollection(UniqueNumberStorage $storage, $name)
{
$storage->filterByRepositoryName($name);
return $storage->readMany();
}
private function fetchNumbersFromCollection(array $collection)
{
$numbers = array();
foreach ($collection as $request) {
$numbers[] = $request->number();
}
return $numbers;
}
private function orderNumbers(array $numbers)
{
natsort($numbers);
return $numbers;
}
private function calculateFreeNumber(array $numbers)
{
$currentMaximum = 0;
foreach ($numbers as $number) {
$numberIsHigherThanCurrentNumber = ($number > $currentMaximum);
if ($numberIsHigherThanCurrentNumber) {
$numberIsHigherThanCurrentNumberPlusOne = ($number > ($currentMaximum + 1));
if ($numberIsHigherThanCurrentNumberPlusOne) {
break;
}
$currentMaximum = $number;
}
}
return (++$currentMaximum);
}
}