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lib/theme/theme_bloc.dart

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+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:equatable/equatable.dart';
+
+part 'theme_events.dart';
+part 'theme_state.dart';
+
+class ThemeBloc extends Bloc<ThemeEvent, ThemeState> {
+  final AppTheme initialAppTheme;
+  ThemeBloc({required this.initialAppTheme})
+    : super(
+        ThemeState(status: ThemeStatus.success, appTheme: initialAppTheme),
+      ) {
+    on<ChangeThemeEvent>((event, emit) async {
+      emit(state.copyWith(appTheme: event.appTheme));
+    });
+  }
+}

lib/theme/theme_events.dart

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+part of 'theme_bloc.dart';
+
+abstract class ThemeEvent extends Equatable {
+  const ThemeEvent();
+
+  @override
+  List<Object> get props => [];
+}
+
+class ChangeThemeEvent extends ThemeEvent {
+  const ChangeThemeEvent({required this.appTheme});
+
+  final AppTheme appTheme;
+
+  @override
+  List<Object> get props => [appTheme];
+}

lib/theme/theme_state.dart

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+part of 'theme_bloc.dart';
+
+enum ThemeStatus { initial, success }
+
+enum AppTheme {
+  dark(name: 'dark'),
+  light(name: 'light'),
+  system(name: 'system');
+
+  final String name;
+
+  const AppTheme({required this.name});
+}
+
+class ThemeState extends Equatable {
+  const ThemeState({required this.status, required this.appTheme});
+
+  final ThemeStatus status;
+  final AppTheme appTheme;
+
+  @override
+  List<Object?> get props => [status, appTheme];
+
+  ThemeState copyWith({ThemeStatus? status, AppTheme? appTheme}) {
+    return ThemeState(
+      status: status ?? this.status,
+      appTheme: appTheme ?? this.appTheme,
+    );
+  }
+}