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import 'dart:io';
import 'dart:async';
import 'package:path_provider/path_provider.dart';
import 'package:sqlite3/sqlite3.dart';
import 'package:path/path.dart' as p;
class DB {
final Completer<Database?> _dbCompleter = Completer<Database?>();
Future<void> connect() async {
String path = await _getDbPath();
Database candidate = sqlite3.open(path);
int? userVersion = _getUserVersion(candidate);
if (userVersion == null || userVersion != 0) {
_dbCompleter.complete(null);
return;
}
_dbCompleter.complete(candidate);
}
void dispose() async {
if (_dbCompleter.isCompleted == false) {
return;
}
Database? db = await _dbCompleter.future;
if (db == null) return;
db.close();
}
static Future<String> _getDbPath() async {
Directory supportDir = await getApplicationSupportDirectory();
return p.join(supportDir.path, 'main.sqlite3');
}
static int? _getUserVersion(Database db) {
ResultSet result = db.select('PRAGMA user_version;');
if (result.length != 1) return null;
return result.first.values.first as int;
}
Future<String?> getServerFqdn() async {
Database? db = await _dbCompleter.future;
if (db == null) return null;
ResultSet result = db.select(
'SELECT value FROM key_value WHERE key = \'server_fqdn\';'
);
if (result.length != 1) return null;
return result[0]['value'];
}
}
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