class TodoItems extends Table {
  IntColumn get id => integer().autoIncrement()();
  TextColumn get title => text().withLength(min: 6, max: 32)();
  TextColumn get content => text().named('body')();
  IntColumn get category => integer().nullable()();
}

part 'database.g.dart';

@DriftDatabase(tables: [TodoItems])
class AppDatabase extends _$AppDatabase {
  AppDatabase() : super(_openConnection());

  @override
  int get schemaVersion => 1;
}

LazyDatabase _openConnection() {
  // the LazyDatabase util lets us find the right location for the file async.
  return LazyDatabase(() async {
    // put the database file, called db.sqlite here, into the documents folder
    // for your app.
    final dbFolder = await getApplicationDocumentsDirectory();
    final file = File(p.join(dbFolder.path, 'db.sqlite'));

    // Also work around limitations on old Android versions
    if (Platform.isAndroid) {
      await applyWorkaroundToOpenSqlite3OnOldAndroidVersions();
    }

    // Make sqlite3 pick a more suitable location for temporary files - the
    // one from the system may be inaccessible due to sandboxing.
    final cachebase = (await getTemporaryDirectory()).path;
    // We can't access /tmp on Android, which sqlite3 would try by default.
    // Explicitly tell it about the correct temporary directory.
    sqlite3.tempDirectory = cachebase;

    return NativeDatabase.createInBackground(file);
  });
}

void main() async {
  WidgetsFlutterBinding.ensureInitialized();

  final database = AppDatabase();

  await database.into(database.todoItems).insert(TodoItemsCompanion.insert(
        title: 'todo: finish drift setup',
        content: 'We can now write queries and define our own tables.',
      ));
  List<TodoItem> allItems = await database.select(database.todoItems).get();

  print('items in database: $allItems');
}

class Items extends Table {
  IntColumn get category => integer().nullable()();
  // ...
}

class TodoItems extends Table {
  // ...
  IntColumn get category =>
      integer().nullable().references(TodoCategories, #id)();
}

@DataClassName("Category")
class TodoCategories extends Table {
  IntColumn get id => integer().autoIncrement()();
  // and more columns...
}

  BoolColumn get enabled => boolean().withDefault(const Constant(false))();

  IntColumn get unique => integer().unique()();

Future<List<TodoItem>> get allTodoItems => database.select(todoItems).get();

Stream<List<TodoItem>> watchEntriesInCategory(Category c) {
  return (database.select(todos)..where((t) => t.category.equals(c.id))).watch();
}