import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:maibu_satabot_v2/core/app/app_user_cubit.dart';
import 'package:maibu_satabot_v2/features/v2/site/presentation/cubit/site_cubit.dart';
import 'package:maibu_satabot_v2/features/v2/home/domain/entities/site_entity.dart';
import 'package:maibu_satabot_v2/features/v2/home/domain/usecases/get_home_data_usecase.dart';
import 'package:maibu_satabot_v2/features/v2/home/domain/usecases/get_site_list_usecase.dart';
import 'package:maibu_satabot_v2/features/v2/home/presentation/bloc/home_v2_event.dart';
import 'package:maibu_satabot_v2/features/v2/home/presentation/bloc/home_v2_state.dart';

class HomeV2Bloc extends Bloc<HomeV2Event, HomeV2State> {
  final GetHomeDataUseCase getHomeDataUseCase;
  final GetSiteListUseCase getSiteListUseCase;
  final AppUserCubit appUserCubit;
  final SiteCubit siteCubit;

  HomeV2Bloc(this.getHomeDataUseCase, this.getSiteListUseCase, this.appUserCubit, this.siteCubit) : super(const HomeV2Initial()) {
    on<HomeV2LoadData>(_onLoadData);
    on<HomeV2Refresh>(_onRefresh);
    on<HomeV2ToggleTrendType>(_onToggleTrendType);
  }

  Future<void> _onLoadData(
    HomeV2LoadData event,
    Emitter<HomeV2State> emit,
  ) async {
    emit(const HomeV2Loading());

    final user = appUserCubit.state.user;
    if (user == null) {
      emit(const HomeV2Error('用户未登录'));
      return;
    }

    // 并行加载首页数据和场站列表
    final homeResult = await getHomeDataUseCase(const NoParams());
    final siteResult = await getSiteListUseCase(user.orgId); // 使用用户的 orgId

    homeResult.fold(
      (failure) => emit(HomeV2Error(failure.message)),
      (homeData) {
        List<SiteEntity> sites = [];
        SiteEntity? selectedSite;
        
        siteResult.fold(
          (failure) {
            print('加载场站列表失败: ${failure.message}');
          },
          (siteList) {
            sites = siteList;
            // 从全局 SiteCubit 获取之前选中的场站
            final savedSelectedSite = siteCubit.state.selectedSite;
            
            // 尝试找到之前选中的场站
            if (savedSelectedSite != null && siteList.isNotEmpty) {
              selectedSite = siteList.firstWhere(
                (site) => site.id == savedSelectedSite.id,
                orElse: () => siteList.first,
              );
            } else {
              // 没有选中过，默认选中第一个
              selectedSite = siteList.isNotEmpty ? siteList.first : null;
            }
            
            // 更新全局 SiteCubit 的选中状态
            if (selectedSite != null) {
              siteCubit.selectSite(selectedSite!);
            }
          },
        );
        
        emit(HomeV2Loaded(
          homeData: homeData,
          sites: sites,
          selectedSite: selectedSite,
        ));
      },
    );
  }

  Future<void> _onRefresh(
    HomeV2Refresh event,
    Emitter<HomeV2State> emit,
  ) async {
    if (state is HomeV2Loaded) {
      final currentState = state as HomeV2Loaded;
      
      final homeResult = await getHomeDataUseCase(const NoParams());

      homeResult.fold(
        (failure) => emit(HomeV2Error(failure.message)),
        (homeData) {
          emit(HomeV2Loaded(
            homeData: homeData,
            trendType: currentState.trendType,
            sites: currentState.sites,
            selectedSite: currentState.selectedSite,
          ));
        },
      );
    }
  }

  void _onToggleTrendType(
    HomeV2ToggleTrendType event,
    Emitter<HomeV2State> emit,
  ) {
    if (state is HomeV2Loaded) {
      final currentState = state as HomeV2Loaded;
      emit(currentState.copyWith(trendType: event.type));
      print('切换趋势类型：${event.type}');
    }
  }
}