<?php
declare(strict_types=1);
namespace JKingWeb\NewsSync\Db;

Trait CommonSQLite3 {
	
	static public function driverName(): string {
		return "SQLite 3";
	}

	public function schemaVersion(): int {
		return $this->query("PRAGMA user_version")->getSingle();
	}

	public function update(int $to): bool {
		$ver = $this->schemaVersion();
		if(!$this->data->conf->dbSQLite3AutoUpd)  throw new Update\Exception("manual", ['version' => $ver, 'driver_name' => $this->driverName()]);
		if($ver >= $to) throw new Update\Exception("tooNew", ['difference' => ($ver - $to), 'current' => $ver, 'target' => $to, 'driver_name' => $this->driverName()]);
		$sep = \DIRECTORY_SEPARATOR;
		$path = \JKingWeb\NewsSync\BASE."sql".$sep."SQLite3".$sep;
		$this->lock();
		$this->begin();
		for($a = $ver; $a < $to; $a++) {
			$this->begin();
			try {
				$file = $path.$a.".sql";
				if(!file_exists($file)) throw new Update\Exception("missing", ['file' => $file, 'driver_name' => $this->driverName()]);
				if(!is_readable($file)) throw new Update\Exception("unreadable", ['file' => $file, 'driver_name' => $this->driverName()]);
				$sql = @file_get_contents($file);
				if($sql===false) throw new Update\Exception("unusable", ['file' => $file, 'driver_name' => $this->driverName()]);
				$this->exec($sql);
			} catch(\Throwable $e) {
				// undo any partial changes from the failed update
				$this->rollback();
				// commit any successful updates if updating by more than one version
				$this->commit(true);
				// throw the error received
				throw $e;
			}
			$this->commit();
		}
		$this->unlock();
		$this->commit();
		return true;
	}

	public function exec(string $query): bool {
		return (bool) $this->db->exec($query);
	}
}