import "package:sqflite/sqflite.dart";
import "package:sqflite/sqlite_api.dart";
import "package:path/path.dart";

class DBHelper {
  DBHelper._();

  static DBHelper dbHelper = DBHelper._();

  late Database _database;

  Future<Database> get database async {
    _database = await _createDatabase();

    return _database;
  }

  Future<Database> _createDatabase() async {
    Database database =
        await openDatabase(join(await getDatabasesPath(), 'lists.db'),
            onCreate: (Database db, int version) {
      db.execute("""
          CREATE TABLE List(
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            list_name TEXT
            is_template int2
          )
          """);
      db.execute("""
          CREATE TABLE Check(
            id INTEGER PRIMARY KEY AUTOINCREMENT,
            check_text TEXT,
            value int2,
            list_id INTEGER
          )
          """);
      db.execute("""
          INSERT INTO List(id, list_name, is_template)
          VALUES
            (0, 'test list', 0),
            (1, 'test template', 1)
      """);
      db.execute("""
          INSERT INTO CHECK(check_text, value, list_id)
          VALUES
            ('test check', 1, 0),
            ('test uncheck', 0, 0),
            ('test check', 1, 1),
            ('test uncheck', 0, 1)
      """);
    }, version: 1);
    return database;
  }

  Future<List<Map<String, dynamic>>> getAllLists() async {
    Database db = await database;

    return db.query("List", where: "is_template = ?", whereArgs: ['0']);
  }

  Future<List<Map<String, dynamic>>> getAllTemplates() async {
    Database db = await database;

    return db.query("List", where: "is_template = ?", whereArgs: ['1']);
  }
}