import '../../../infrastructure/utilityWidgets/loadableHydratedBloc/loadable_hydrated_bloc.dart';
import '../../../infrastructure/utilityWidgets/loadableHydratedBloc/loadable_hydrated_bloc_event.dart';
import '../repository/chat_repository.dart';
import 'chat_event.dart';
import 'chat_state.dart';

class ChatBloc extends LoadableHydratedBloc<ChatEvent, ChatState, ChatRepository> {
  DateTime _lastTokenSet = DateTime.fromMillisecondsSinceEpoch(0);

  @override
  ChatRepository repository() => ChatRepository();

  @override
  ChatState fromNothing() => const ChatState();

  @override
  ChatState fromStorage(Map<String, dynamic> json) => ChatState.fromJson(json);

  @override
  Map<String, dynamic>? toStorage(ChatState state) => state.toJson();

  @override
  Future<void> gatherData() async {
    final token = innerState?.currentToken ?? '';
    if (token.isEmpty) return;
    _loadChat(token);
  }

  void setToken(String token) {
    if (token == (innerState?.currentToken ?? '')) {
      refresh();
      return;
    }
    add(Emit((s) => s.copyWith(currentToken: token, chatResponse: null)));
    _loadChat(token);
  }

  void setReferenceMessageId(int? messageId) {
    add(Emit((s) => s.copyWith(referenceMessageId: messageId)));
  }

  void refresh() {
    final token = innerState?.currentToken ?? '';
    if (token.isNotEmpty) _loadChat(token);
  }

  void _loadChat(String token) {
    final requestStart = DateTime.now();
    _lastTokenSet = requestStart;
    repo.data.getChat(
      token: token,
      onUpdate: (data) {
        if (_lastTokenSet.isAfter(requestStart)) return;
        if ((innerState?.currentToken ?? '') != token) return;
        add(DataGathered((s) => s.copyWith(chatResponse: data)));
      },
    );
  }
}