import 'dart:async';
import 'package:path/path.dart';
import 'package:sqflite/sqflite.dart';

class DatabaseHelper {
  static final DatabaseHelper _instance = DatabaseHelper._internal();
  factory DatabaseHelper() => _instance;
  static Database? _database;

  DatabaseHelper._internal();

  Future<Database> get database async {
    if (_database != null) return _database!;
    _database = await _initDatabase();
    return _database!;
  }

  Future<Database> _initDatabase() async {
    String path = join(
      await getDatabasesPath(),
      'database.db',
    );
    return await openDatabase(path, version: 1, onCreate: _createDB);
  }

  Future<void> _createDB(Database db, int version) async {
    final batch = db.batch();
    // 商务会议助手列表
    batch.execute('''
      CREATE TABLE IF NOT EXISTS meeting (
        id INTEGER PRIMARY KEY,
        title TEXT,
        content TEXT,
        seconds INTEGER,
        creationtime INTEGER
      )
    ''');
    // 商务会议助手详情内容
    batch.execute('''
      CREATE TABLE IF NOT EXISTS meetingdetails (
        id INTEGER PRIMARY KEY,
        meetingid INTEGER,
        audio BLOB,
        content TEXT
      )
    ''');
    await batch.commit();
  }
}