import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:syncrow_web/pages/common/bloc/project_manager.dart';
import 'package:syncrow_web/pages/space_tree/bloc/space_tree_event.dart';
import 'package:syncrow_web/pages/space_tree/bloc/space_tree_state.dart';
import 'package:syncrow_web/pages/spaces_management/all_spaces/model/community_model.dart';
import 'package:syncrow_web/pages/spaces_management/all_spaces/model/space_model.dart';
import 'package:syncrow_web/services/space_mana_api.dart';

class SpaceTreeBloc extends Bloc<SpaceTreeEvent, SpaceTreeState> {
  SpaceTreeBloc() : super(const SpaceTreeState()) {
    on<InitialEvent>(_fetchSpaces);
    on<OnCommunityExpanded>(_onCommunityExpanded);
    on<OnSpaceExpanded>(_onSpaceExpanded);
    on<OnCommunitySelected>(_onCommunitySelected);
    on<OnSpaceSelected>(_onSpaceSelected);
    on<SearchQueryEvent>(_onSearch);
    on<ClearAllData>(_clearAllData);
    on<ClearCachedData>(_clearCachedData);
  }

  _fetchSpaces(InitialEvent event, Emitter<SpaceTreeState> emit) async {
    emit(SpaceTreeLoadingState());
    try {
      final projectUuid = await ProjectManager.getProjectUUID() ?? '';

      List<CommunityModel> communities =
          await CommunitySpaceManagementApi().fetchCommunities(projectUuid);

      List<CommunityModel> updatedCommunities = await Future.wait(
        communities.map((community) async {
          List<SpaceModel> spaces =
              await CommunitySpaceManagementApi().getSpaceHierarchy(community.uuid, projectUuid);

          return CommunityModel(
            uuid: community.uuid,
            createdAt: community.createdAt,
            updatedAt: community.updatedAt,
            name: community.name,
            description: community.description,
            spaces: spaces,
            region: community.region,
          );
        }).toList(),
      );

      emit(state.copyWith(
          communitiesList: updatedCommunities, expandedCommunity: [], expandedSpaces: []));
    } catch (e) {
      emit(SpaceTreeErrorState('Error loading communities and spaces: $e'));
    }
  }

  _onCommunityExpanded(OnCommunityExpanded event, Emitter<SpaceTreeState> emit) async {
    try {
      List<String> updatedExpandedCommunityList = List.from(state.expandedCommunities);

      if (updatedExpandedCommunityList.contains(event.communityId)) {
        updatedExpandedCommunityList.remove(event.communityId);
      } else {
        updatedExpandedCommunityList.add(event.communityId);
      }

      emit(state.copyWith(
        expandedCommunity: updatedExpandedCommunityList,
      ));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  _onSpaceExpanded(OnSpaceExpanded event, Emitter<SpaceTreeState> emit) async {
    try {
      List<String> updatedExpandedSpacesList = List.from(state.expandedSpaces);

      if (updatedExpandedSpacesList.contains(event.spaceId)) {
        updatedExpandedSpacesList.remove(event.spaceId);
      } else {
        updatedExpandedSpacesList.add(event.spaceId);
      }

      emit(state.copyWith(expandedSpaces: updatedExpandedSpacesList));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  _onCommunitySelected(OnCommunitySelected event, Emitter<SpaceTreeState> emit) async {
    try {
      List<String> updatedSelectedCommunities =
          List.from(state.selectedCommunities.toSet().toList());
      List<String> updatedSelectedSpaces = List.from(state.selectedSpaces.toSet().toList());
      List<String> updatedSoldChecks = List.from(state.soldCheck.toSet().toList());
      Map<String, List<String>> communityAndSpaces = Map.from(state.selectedCommunityAndSpaces);

      List<String> childrenIds = _getAllChildIds(event.children);

      if (!updatedSelectedCommunities.contains(event.communityId)) {
        // Select the community and all its children
        updatedSelectedCommunities.add(event.communityId);
        updatedSelectedSpaces.addAll(childrenIds);
      } else {
        // Unselect the community and all its children
        updatedSelectedCommunities.remove(event.communityId);
        updatedSelectedSpaces.removeWhere(childrenIds.contains);
        updatedSoldChecks.removeWhere(childrenIds.contains);
      }

      communityAndSpaces[event.communityId] = updatedSelectedSpaces;

      emit(state.copyWith(
          selectedCommunities: updatedSelectedCommunities,
          selectedSpaces: updatedSelectedSpaces,
          soldCheck: updatedSoldChecks,
          selectedCommunityAndSpaces: communityAndSpaces));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  _onSpaceSelected(OnSpaceSelected event, Emitter<SpaceTreeState> emit) async {
    try {
      List<String> updatedSelectedCommunities =
          List.from(state.selectedCommunities.toSet().toList());
      List<String> updatedSelectedSpaces = List.from(state.selectedSpaces.toSet().toList());
      List<String> updatedSoldChecks = List.from(state.soldCheck.toSet().toList());
      Map<String, List<String>> communityAndSpaces = Map.from(state.selectedCommunityAndSpaces);

      List<String> childrenIds = _getAllChildIds(event.children);
      bool isChildSelected = false;

      for (String id in childrenIds) {
        if (updatedSelectedSpaces.contains(id)) {
          isChildSelected = true;
        }
      }

      if (!updatedSelectedSpaces.contains(event.spaceId) &&
          !updatedSoldChecks.contains(event.spaceId)) {
        // First click: Select the space and all its children
        updatedSelectedSpaces.add(event.spaceId);
        updatedSelectedCommunities.add(event.communityModel.uuid);
        if (childrenIds.isNotEmpty) {
          updatedSelectedSpaces.addAll(childrenIds);
        }

        List<String> spaces = _getThePathToChild(event.communityModel.uuid, event.spaceId);
        for (String space in spaces) {
          if (!updatedSelectedSpaces.contains(space) && !updatedSoldChecks.contains(space)) {
            updatedSoldChecks.add(space);
          }
        }
      } else if (!updatedSoldChecks.contains(event.spaceId) &&
          childrenIds.isNotEmpty &&
          isChildSelected) {
        // Second click: Unselect space but keep children
        updatedSelectedSpaces.remove(event.spaceId);
        updatedSoldChecks.add(event.spaceId);
      } else {
        // Third click: Unselect space and all its children
        updatedSelectedSpaces.remove(event.spaceId);
        if (childrenIds.isNotEmpty) {
          updatedSelectedSpaces.removeWhere(childrenIds.contains);
          updatedSoldChecks.removeWhere(childrenIds.contains);
        }
        updatedSoldChecks.remove(event.spaceId);

        List<String> parents =
            _getThePathToChild(event.communityModel.uuid, event.spaceId).toSet().toList();

        if (updatedSelectedSpaces.isEmpty) {
          updatedSoldChecks.removeWhere(parents.contains);
          updatedSelectedCommunities.remove(event.communityModel.uuid);
        } else {
          // Check if any parent has selected children
          for (String space in parents) {
            if (!_noChildrenSelected(event.communityModel, space, updatedSelectedSpaces, parents)) {
              updatedSoldChecks.remove(space);
            }
          }

          if (!_anySpacesSelectedInCommunity(
              event.communityModel, updatedSelectedSpaces, updatedSoldChecks)) {
            updatedSelectedCommunities.remove(event.communityModel.uuid);
          }
        }
      }

      communityAndSpaces[event.communityModel.uuid] = updatedSelectedSpaces;

      emit(state.copyWith(
          selectedCommunities: updatedSelectedCommunities.toSet().toList(),
          selectedSpaces: updatedSelectedSpaces,
          soldCheck: updatedSoldChecks,
          selectedCommunityAndSpaces: communityAndSpaces));
      emit(state.copyWith(selectedSpaces: updatedSelectedSpaces));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  _noChildrenSelected(
      CommunityModel community, String spaceId, List<String> selectedSpaces, List<String> parents) {
    if (selectedSpaces.contains(spaceId)) {
      return true;
    }

    List<SpaceModel> children = _getAllChildSpaces(community.spaces);
    for (var child in children) {
      if (spaceId == child.uuid) {
        List<String> ids = _getAllChildIds(child.children);
        for (var id in ids) {
          if (selectedSpaces.contains(id)) {
            return true;
          }
        }
      }
    }

    return false;
  }

  _onSearch(SearchQueryEvent event, Emitter<SpaceTreeState> emit) async {
    try {
      List<CommunityModel> communities = List.from(state.communityList);
      List<CommunityModel> filteredCommunity = [];

      // Filter communities and expand only those that match the query
      filteredCommunity = communities.where((community) {
        final containsQueryInCommunity =
            community.name.toLowerCase().contains(event.searchQuery.toLowerCase());
        final containsQueryInSpaces =
            community.spaces.any((space) => _containsQuery(space, event.searchQuery.toLowerCase()));

        return containsQueryInCommunity || containsQueryInSpaces;
      }).toList();

      emit(state.copyWith(
          filteredCommunity: filteredCommunity,
          isSearching: event.searchQuery.isNotEmpty,
          searchQuery: event.searchQuery));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  _clearAllData(ClearAllData event, Emitter<SpaceTreeState> emit) async {
    try {
      emit(state.copyWith(
          communitiesList: [],
          filteredCommunity: [],
          isSearching: false,
          soldCheck: [],
          selectedSpaces: [],
          selectedCommunities: [],
          selectedCommunityAndSpaces: {},
          searchQuery: '',
          expandedSpaces: [],
          expandedCommunity: []));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  _clearCachedData(ClearCachedData event, Emitter<SpaceTreeState> emit) async {
    try {
      emit(state.copyWith(
          communitiesList: state.communityList,
          filteredCommunity: [],
          isSearching: false,
          soldCheck: [],
          selectedSpaces: [],
          selectedCommunities: [],
          selectedCommunityAndSpaces: {},
          searchQuery: '',
          expandedSpaces: [],
          expandedCommunity: []));
    } catch (e) {
      emit(const SpaceTreeErrorState('Something went wrong'));
    }
  }

  // Helper function to determine if any space or its children match the search query
  bool _containsQuery(SpaceModel space, String query) {
    final matchesSpace = space.name.toLowerCase().contains(query);
    final matchesChildren =
        space.children.any((child) => _containsQuery(child, query)); // Recursive check for children

    return matchesSpace || matchesChildren;
  }

  List<String> _getAllChildIds(List<SpaceModel> spaces) {
    List<String> ids = [];
    for (var child in spaces) {
      ids.add(child.uuid!);
      ids.addAll(_getAllChildIds(child.children));
    }
    return ids.toSet().toList();
  }

  List<SpaceModel> _getAllChildSpaces(List<SpaceModel> spaces) {
    List<SpaceModel> children = [];
    for (var child in spaces) {
      children.add(child);
      children.addAll(_getAllChildSpaces(child.children));
    }
    return children;
  }

  bool _anySpacesSelectedInCommunity(
      CommunityModel community, List<String> selectedSpaces, List<String> partialCheckedList) {
    bool result = false;
    List<String> ids = _getAllChildIds(community.spaces);
    for (var id in ids) {
      result = selectedSpaces.contains(id) || partialCheckedList.contains(id);
      if (result) {
        return result;
      }
    }
    return result;
  }

  List<String> _getThePathToChild(String communityId, String selectedSpaceId) {
    List<String> ids = [];
    for (var community in state.communityList) {
      if (community.uuid == communityId) {
        for (var space in community.spaces) {
          List<String> list = [];
          list.add(space.uuid!);
          ids = _getAllParentsIds(space, selectedSpaceId, List.from(list));
          if (ids.isNotEmpty) {
            return ids;
          }
        }
      }
    }
    return ids;
  }

  List<String> _getAllParentsIds(SpaceModel child, String spaceId, List<String> listIds) {
    List<String> ids = listIds;

    ids.add(child.uuid ?? '');

    if (child.uuid == spaceId) {
      return ids;
    }

    if (child.children.isNotEmpty) {
      for (var space in child.children) {
        var result = _getAllParentsIds(space, spaceId, List.from(ids));
        if (result.isNotEmpty) {
          return result;
        }
      }
    }

    ids.removeLast();
    return [];
  }

  @override
  Future<void> close() async {
    super.close();
  }
}