import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:syncrow_web/common/widgets/empty_search_result_widget.dart';
import 'package:syncrow_web/common/widgets/search_bar.dart';
import 'package:syncrow_web/common/widgets/sidebar_communities_list.dart';
import 'package:syncrow_web/pages/spaces_management/all_spaces/bloc/space_management_bloc.dart';
import 'package:syncrow_web/pages/spaces_management/all_spaces/bloc/space_management_event.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/pages/spaces_management/all_spaces/widgets/community_tile.dart';
import 'package:syncrow_web/pages/spaces_management/all_spaces/widgets/sidebar_header.dart';
import 'package:syncrow_web/pages/spaces_management/all_spaces/widgets/space_tile_widget.dart';
import 'package:syncrow_web/pages/spaces_management/create_community/view/create_community_dialog.dart';
import 'package:syncrow_web/pages/spaces_management/structure_selector/bloc/center_body_bloc.dart';
import 'package:syncrow_web/pages/spaces_management/structure_selector/bloc/center_body_event.dart';
import 'package:syncrow_web/utils/style.dart';

class SidebarWidget extends StatefulWidget {
  final List<CommunityModel> communities;
  final String? selectedSpaceUuid;
  final void Function(String name, String description) onCreateCommunity;

  const SidebarWidget({
    required this.communities,
    required this.onCreateCommunity,
    this.selectedSpaceUuid,
    super.key,
  });

  @override
  State<SidebarWidget> createState() => _SidebarWidgetState();
}

class _SidebarWidgetState extends State<SidebarWidget> {
  late final ScrollController _scrollController;

  String _searchQuery = '';
  String? _selectedSpaceUuid;
  String? _selectedId;

  @override
  void initState() {
    _selectedId = widget.selectedSpaceUuid;
    _scrollController = ScrollController();
    super.initState();
  }

  @override
  void dispose() {
    _scrollController.dispose();
    super.dispose();
  }

  @override
  void didUpdateWidget(covariant SidebarWidget oldWidget) {
    if (widget.selectedSpaceUuid != oldWidget.selectedSpaceUuid) {
      setState(() => _selectedId = widget.selectedSpaceUuid);
    }
    super.didUpdateWidget(oldWidget);
  }

  List<CommunityModel> _filteredCommunities() {
    if (_searchQuery.isEmpty) {
      _selectedSpaceUuid = null;
      return widget.communities;
    }

    return widget.communities.where((community) {
      final containsQueryInCommunity =
          community.name.toLowerCase().contains(_searchQuery.toLowerCase());
      final containsQueryInSpaces = community.spaces.any((space) =>
          _containsQuery(space: space, query: _searchQuery.toLowerCase()));

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

  bool _containsQuery({
    required SpaceModel space,
    required String query,
  }) {
    final matchesSpace = space.name.toLowerCase().contains(query);
    final matchesChildren = space.children.any(
      (child) => _containsQuery(space: child, query: query),
    );

    if (matchesSpace || matchesChildren) {
      _selectedSpaceUuid = space.uuid;
    }

    return matchesSpace || matchesChildren;
  }

  bool _isSpaceOrChildSelected(SpaceModel space) {
    final isSpaceSelected = _selectedSpaceUuid == space.uuid;
    final anySubSpaceIsSelected = space.children.any(_isSpaceOrChildSelected);
    return isSpaceSelected || anySubSpaceIsSelected;
  }

  static const _width = 300.0;

  @override
  Widget build(BuildContext context) {
    final filteredCommunities = _filteredCommunities();

    return Container(
      width: _width,
      decoration: subSectionContainerDecoration,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SidebarHeader(onAddCommunity: _onAddCommunity),
          CustomSearchBar(
            onSearchChanged: (query) => setState(() => _searchQuery = query),
          ),
          const SizedBox(height: 16),
          Expanded(
            child: Visibility(
              visible: filteredCommunities.isNotEmpty,
              replacement: const EmptySearchResultWidget(),
              child: SidebarCommunitiesList(
                scrollController: _scrollController,
                onScrollToEnd: () {},
                communities: filteredCommunities,
                itemBuilder: (context, index) => _buildCommunityTile(
                  context,
                  filteredCommunities[index],
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _buildCommunityTile(BuildContext context, CommunityModel community) {
    return CommunityTile(
      title: community.name,
      key: ValueKey(community.uuid),
      isSelected: _selectedId == community.uuid,
      isExpanded: false,
      onItemSelected: () {
        setState(() {
          _selectedId = community.uuid;
          _selectedSpaceUuid = null;
        });

        context.read<CenterBodyBloc>().add(CommunitySelectedEvent());

        context.read<SpaceManagementBloc>().add(
              SelectCommunityEvent(selectedCommunity: community),
            );
      },
      onExpansionChanged: (title, expanded) {},
      children: community.spaces
          .where(
            (space) => {
              SpaceStatus.deleted,
              SpaceStatus.parentDeleted,
            }.contains(space.status),
          )
          .map((space) => _buildSpaceTile(space: space, community: community))
          .toList(),
    );
  }

  Widget _buildSpaceTile({
    required SpaceModel space,
    required CommunityModel community,
  }) {
    final spaceIsExpanded = _isSpaceOrChildSelected(space);
    final isSelected = _selectedId == space.uuid;
    return Padding(
      padding: const EdgeInsetsDirectional.only(start: 16.0),
      child: SpaceTile(
        title: space.name,
        key: ValueKey(space.uuid),
        isSelected: isSelected,
        initiallyExpanded: spaceIsExpanded,
        onExpansionChanged: (expanded) {},
        onItemSelected: () {
          setState(() {
            _selectedId = space.uuid;
            _selectedSpaceUuid = space.uuid;
          });

          context.read<SpaceManagementBloc>().add(
                SelectSpaceEvent(selectedCommunity: community, selectedSpace: space),
              );
        },
        children: space.children
            .map(
              (childSpace) => _buildSpaceTile(
                space: childSpace,
                community: community,
              ),
            )
            .toList(),
      ),
    );
  }

  void _onAddCommunity() => _selectedId?.isNotEmpty ?? true
      ? _clearSelection()
      : _showCreateCommunityDialog();

  void _clearSelection() {
    setState(() => _selectedId = '');
    context.read<SpaceManagementBloc>().add(
          NewCommunityEvent(communities: widget.communities),
        );
  }

  void _showCreateCommunityDialog() {
    showDialog<void>(
      context: context,
      builder: (context) => CreateCommunityDialog(
        isEditMode: false,
        existingCommunityNames: widget.communities.map((e) => e.name).toList(),
        onCreateCommunity: widget.onCreateCommunity,
      ),
    );
  }
}