<?php
/**
 * @author Arthur Schiwon <blizzz@owncloud.com>
 * @author Bart Visscher <bartv@thisnet.nl>
 * @author Robin Appelman <icewind@owncloud.com>
 *
 * @copyright Copyright (c) 2015, ownCloud, Inc.
 * @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\DB;

class AdapterSqlite extends Adapter {
	public function fixupStatement($statement) {
		$statement = preg_replace('/`(\w+)` ILIKE \?/', 'LOWER($1) LIKE LOWER(?)', $statement);
		$statement = str_replace( '`', '"', $statement );
		$statement = str_ireplace( 'NOW()', 'datetime(\'now\')', $statement );
		$statement = str_ireplace( 'UNIX_TIMESTAMP()', 'strftime(\'%s\',\'now\')', $statement );
		return $statement;
	}

	public function insertIfNotExist($table, $input) {
		// NOTE: For SQLite we have to use this clumsy approach
		// otherwise all fieldnames used must have a unique key.
		$query = 'SELECT COUNT(*) FROM `' . $table . '` WHERE ';
		$inserts = array();
		foreach ($input as $key => $value) {
			$query .= '`' . $key . '`';
			if (is_null($value)) {
				$query .= ' IS NULL AND ';
			} else {
				$inserts[] = $value;
				$query .= ' = ? AND ';
			}
		}
		$query = substr($query, 0, strlen($query) - 5);

		try {
			$stmt = $this->conn->prepare($query);
			$result = $stmt->execute($inserts);
		} catch(\Doctrine\DBAL\DBALException $e) {
			$entry = 'DB Error: "'.$e->getMessage() . '"<br />';
			$entry .= 'Offending command was: ' . $query . '<br />';
			\OC_Log::write('core', $entry, \OC_Log::FATAL);
			$l = \OC::$server->getL10N('lib');
			throw new \OC\HintException(
				$l->t('Database Error'),
				$l->t('Please contact your system administrator.'),
				0,
				$e
			);
		}

		if ($stmt->fetchColumn() === '0') {
			$query = 'INSERT INTO `' . $table . '` (`'
				. implode('`,`', array_keys($input)) . '`) VALUES('
				. str_repeat('?,', count($input)-1).'? ' . ')';
		} else {
			return 0; //no rows updated
		}

		try {
			$statement = $this->conn->prepare($query);
			$result = $statement->execute(array_values($input));
		} catch(\Doctrine\DBAL\DBALException $e) {
			$entry = 'DB Error: "'.$e->getMessage() . '"<br />';
			$entry .= 'Offending command was: ' . $query.'<br />';
			\OC_Log::write('core', $entry, \OC_Log::FATAL);
			$l = \OC::$server->getL10N('lib');
			throw new \OC\HintException(
				$l->t('Database Error'),
				$l->t('Please contact your system administrator.'),
				0,
				$e
			);
		}

		return $result;
	}
}