<?php

namespace Common;

use Doctrine\Common\Proxy\AbstractProxyFactory;
use Doctrine\ORM\ORMSetup;
use Doctrine\ORM\EntityManager;
use Doctrine\DBAL\DriverManager;
use Symfony\Component\Cache\Adapter\FilesystemAdapter;
use Symfony\Component\Cache\Adapter\ArrayAdapter;
use RuntimeException;

/**
 * Factory for creating Doctrine entity manager - designed to work with DI Containers
 *
 * @author Jan Pavlíček <jan.pavlicek@altekpro.cz>
 * @since 1.0.0
 */
class EntityManagerFactory
{
    public static function create(array $params, bool $dev_mode = false) : EntityManager
    {
        self::checkRequiredParams($params, ['paths', 'database', 'proxy_dir']);

        $paths = $params['paths'];
        $connection = $params['database'];

        $cache_adapter = $dev_mode ? new ArrayAdapter : new FilesystemAdapter('', 0, $params['cache_dir']);

        $config = ORMSetup::createAttributeMetadataConfiguration($paths, $dev_mode, $params['proxy_dir'], $cache_adapter);
        $config->setAutoGenerateProxyClasses($dev_mode ? AbstractProxyFactory::AUTOGENERATE_ALWAYS : AbstractProxyFactory::AUTOGENERATE_NEVER);

        $connection = DriverManager::getConnection($params['database'], $config);
        $em = new EntityManager($connection, $config);
        return $em;
    }


    /**
     * Validation method for checking parameters
     *
     * @throws RuntimeException
     */
    private static function checkRequiredParams(array $params, array $required) : void
    {
        $errors = [];
        foreach ($required as $name) {
            if (!isset($params[$name])) {
                $errors[] = "Required parameter '$name' not found in array.";
            }
        }

        if ($errors) {
            throw new RuntimeException(implode(' ', $errors));
        }
    }
}