<?php
/**
 * @author Vincent Petry <pvince81@owncloud.com>
 *
 * @copyright Copyright (c) 2017, ownCloud GmbH
 * @license AGPL-3.0
 *
 * This code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License, version 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License, version 3,
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */
namespace OC\Migrations;

use Doctrine\DBAL\Schema\Schema;
use OCP\Migration\ISchemaMigration;

/**
 * Remove unique constraint on account table email column
 */
class Version20170418154659 implements ISchemaMigration {

	public function changeSchema(Schema $schema, array $options) {
		$prefix = $options['tablePrefix'];
		$table = $schema->getTable("{$prefix}accounts");

		// in beta versions a constraint was added, remove it if it exists
		foreach ($table->getIndexes() as $index) {
			if ($index->spansColumns(['email'])) {
				$table->dropIndex($index->getName());
				break;
			}
		}
	}
}
