import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:syncrow_web/pages/routines/create_new_routines/dropdown_menu_content.dart';
import 'package:syncrow_web/pages/space_tree/bloc/space_tree_bloc.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/utils/color_manager.dart';

class SpaceTreeDropdown extends StatefulWidget {
  final String? selectedSpaceId;
  final Function(String?)? onChanged;

  const SpaceTreeDropdown({
    super.key,
    this.selectedSpaceId,
    this.onChanged,
  });

  @override
  State<SpaceTreeDropdown> createState() => _SpaceTreeDropdownState();
}

class _SpaceTreeDropdownState extends State<SpaceTreeDropdown> {
  late String? _selectedSpaceId;
  final LayerLink _layerLink = LayerLink();
  OverlayEntry? _overlayEntry;

  @override
  void initState() {
    super.initState();
    _selectedSpaceId = widget.selectedSpaceId;
  }

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

  void _removeOverlay() {
    _overlayEntry?.remove();
    _overlayEntry = null;
  }

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<SpaceTreeBloc, SpaceTreeState>(
      builder: (context, state) {
        final communities = state.searchQuery.isNotEmpty
            ? state.filteredCommunity
            : state.communityList;
        final selectedCommunity = _findCommunity(communities, _selectedSpaceId);

        return CompositedTransformTarget(
          link: _layerLink,
          child: GestureDetector(
            onTap: _toggleDropdown,
            child: Container(
              height: 46,
              decoration: BoxDecoration(
                border: Border.all(color: Colors.grey.shade300),
                borderRadius: BorderRadius.circular(12),
              ),
              margin: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  Padding(
                    padding: const EdgeInsets.symmetric(horizontal: 12),
                    child: Text(
                      selectedCommunity?.name ?? 'Select a space',
                      style: TextStyle(
                        color: selectedCommunity != null
                            ? Colors.black
                            : Colors.grey,
                        overflow: TextOverflow.ellipsis,
                        fontWeight: FontWeight.w400,
                        fontSize: 15,
                      ),
                    ),
                  ),
                  Container(
                    decoration: BoxDecoration(
                      color: Colors.grey[200],
                      borderRadius: const BorderRadius.only(
                        topRight: Radius.circular(10),
                        bottomRight: Radius.circular(10),
                      ),
                    ),
                    height: 45,
                    width: 35,
                    child: const Icon(
                      Icons.keyboard_arrow_down,
                      color: ColorsManager.textGray,
                    ),
                  ),
                ],
              ),
            ),
          ),
        );
      },
    );
  }

  void _toggleDropdown() {
    if (_overlayEntry != null) {
      _removeOverlay();
      return;
    }

    _overlayEntry = OverlayEntry(
      builder: (context) => Positioned(
        width: 300,
        child: CompositedTransformFollower(
          link: _layerLink,
          showWhenUnlinked: false,
          offset: const Offset(0, 48),
          child: Material(
            elevation: 8,
            borderRadius: BorderRadius.circular(12),
            child: DropdownMenuContent(
              selectedSpaceId: _selectedSpaceId,
              onChanged: (id) {
                if (id != null && mounted) {
                  setState(() => _selectedSpaceId = id);
                  widget.onChanged?.call(id);
                  _removeOverlay();
                }
              },
              onClose: _removeOverlay,
            ),
          ),
        ),
      ),
    );

    Overlay.of(context).insert(_overlayEntry!);
  }

  CommunityModel? _findCommunity(
      List<CommunityModel> communities, String? communityId) {
    if (communityId == null) return null;

    try {
      return communities.firstWhere((c) => c.uuid == communityId);
    } catch (e) {
      return CommunityModel(
          uuid: '',
          createdAt: DateTime.now(),
          updatedAt: DateTime.now(),
          name: '',
          description: '',
          spaces: []);
    }
  }
}