<?php

namespace App\Command;

use Symfony\Component\Console\Command\Command;
use Symfony\Component\Console\Input\InputArgument;
use Symfony\Component\Console\Input\InputOption;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;

use Doctrine\ORM\EntityManagerInterface;
use Doctrine\ORM\Query;
use Doctrine\DBAL\DBALException;

use App\Entity\Customer;

use App\Service\UniqueIdGenerator;

use PDO;

class SetCustomerGeneratedIdCommand extends Command
{
    const GENERATED_ID_LENGTH = 40;

    private $em;
    private $id_gen;

    public function __construct(EntityManagerInterface $em, UniqueIdGenerator $id_gen)
    {
        $this->em = $em;
        $this->id_gen = $id_gen;

        parent::__construct();
    }

    protected function configure()
    {
        $this->setName('customer:setgeneratedid')
            ->setDescription('Set customer generated id.')
            ->setHelp('Set customer generated id.');
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $em  = $this->em;

        $batch_size = 20;
        $i = 1;

        $em->getConnection()->getConfiguration()->setSQLLogger(null);

        // get all customers with no generated ids. First time to run this would mean all customers
        $cust_q = $em->createQuery('SELECT c from App\Entity\Customer c where c.generated_id is null'); 

        $customers = $cust_q->iterate();
        foreach ($customers as $row)
        {
            $cust = $row[0];
            $output->writeln('Processing customer ' . $cust->getID());

            // retry until we get a unique generated id
            while (true)
            {
                try
                {
                    $generated_id = $this->generateUniqueId(self::GENERATED_ID_LENGTH);

                    // set generated id
                    $cust->setGeneratedId($generated_id);

                    // reopen in case we get an exception
                    if (!$em->isOpen())
                    {
                        $em = $em->create(
                            $em->getConnection(),
                            $em->getConfiguration()
                        );
                    }

                    //++$i;
                    //if (($i % $batch_size) === 0)
                    //{
                    $em->flush();
                    $em->clear();
                    //}
                }
                catch (DBALException $e)
                {
                    error_log($e->getMessage());
                    // delay one second and try again
                    sleep(1);
                    continue;
                }

                break;
            }
            $em->detach($row[0]);
        }

        //$em->flush();

        return 0;
    }

    protected function generateUniqueId($str_length)
    {
        return substr(md5(time()), 0, $str_length);
    }

}