import 'package:bloc/bloc.dart';
import 'package:dio_cache_interceptor_hive_store/dio_cache_interceptor_hive_store.dart';
import 'package:fast_immutable_collections/fast_immutable_collections.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:flutter_map_cache/flutter_map_cache.dart';
import 'package:flutter_map_compass/flutter_map_compass.dart';
import 'package:flutter_map_math/flutter_geo_math.dart';
import 'package:get_it/get_it.dart';
import 'package:intl/intl.dart';
import 'package:latlong2/latlong.dart';
import 'package:ot_viewer_app/global_location_store.dart';
import 'package:ot_viewer_app/refresh_cubit.dart';
import 'package:ot_viewer_app/settings_page.dart';
import 'package:ot_viewer_app/user_path_bloc.dart';
import 'package:ot_viewer_app/util.dart';
import 'package:ot_viewer_app/web_socket_cubit.dart';
import 'package:path_provider/path_provider.dart';
import 'owntracks_api.dart';
import 'dart:math' as math;

Future<String> getPath() async {
  final cacheDirectory = await getTemporaryDirectory();
  return cacheDirectory.path;
}

class MapPage extends StatefulWidget {
  const MapPage({super.key});

  @override
  createState() => _MapPageState();
}

class _MapPageState extends State<MapPage> {
  final MapController _mapController = MapController();

  @override
  void initState() {
    super.initState();
    // _fetchPoints();
  }

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) {
        final cubit = LocationSubscribeCubit();
        final settingsCubit = context.read<SettingsCubit>();
        cubit.subscribe(settingsCubit.state);
        settingsCubit.stream.listen((settings) => cubit.subscribe(settings));
        final refreshCubit = context.read<RefreshCubit>();
        refreshCubit.stream.listen((_) => cubit.reconnect());
        return cubit;
      },
      child: FutureBuilder<String>(
        future: getPath(),
        builder: (something, tempPath) =>
            BlocBuilder<SettingsCubit, SettingsState>(
          builder: (context, state) {
            if (tempPath.data == null) {
              return const Center(child: Text('Loading Map...'));
            }
            return Stack(children: [
              FlutterMap(
                mapController: _mapController,
                options: const MapOptions(
                  initialCenter: LatLng(48.3285, 9.8942),
                  initialZoom: 13.0,
                ),
                children: [
                  TileLayer(
                    urlTemplate:
                        'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
                    tileProvider: CachedTileProvider(
                        maxStale: const Duration(days: 30),
                        store: HiveCacheStore(tempPath.data!,
                            hiveBoxName: 'HiveCacheStore')),
                  ),
                  ...state.activeDevices.map((id) =>
                      UserPath(key: ValueKey(id), device: id, settings: state)),
                  const MapCompass.cupertino(
                      rotationDuration: Duration(milliseconds: 600)),
                  // CurrentLocationLayer(),  TODO: add permission
                  RichAttributionWidget(
                    attributions: [
                      TextSourceAttribution(
                        'OpenStreetMap contributors',
                        onTap: () =>
                            (Uri.parse('https://openstreetmap.org/copyright')),
                      ),
                    ],
                  ),
                ],
              ),
              Positioned(
                bottom: 16,
                left: 16,
                child: TrackerSelector(
                  mapController: _mapController,
                ),
              ),
            ]);
          },
        ),
      ),
    );
  }
}

class UserPath extends StatefulWidget {
  UserPath({super.key, required this.device, required this.settings});

  (String, String) device;
  SettingsState settings;

  @override
  createState() => _UserPathState();
}

class _UserPathState extends State<UserPath> {
  @override
  Widget build(BuildContext ctx) {
    print('rebuilding widget for ${widget.device}');
    return BlocProvider(
      create: (context) {
        final bloc = UserPathBloc(widget.device, widget.settings);
        bloc.add(UserPathFullUpdate());
        // ONLY WORKS because gets rebuilt every time with settings update
        return bloc;
      },
      child: MultiBlocListener(
        listeners: [
          BlocListener<LocationSubscribeCubit, LocationUpdateState>(
              listenWhen: (prevState, state) => state is LocationUpdateReceived,
              listener: (context, state) {
                UserPathBloc userPathBloc = context.read<UserPathBloc>();
                if (state
                    case LocationUpdateReceived(
                      :final position,
                      :final deviceId
                    )) {
                  if (userPathBloc.deviceId == state.deviceId) {
                    userPathBloc.add(UserPathLiveSubscriptionUpdate(position));
                  }
                }
              }),
          BlocListener<RefreshCubit, DateTime>(
            listener: (context, state) {
              context.read<UserPathBloc>().add(UserPathFullUpdate());
            },
          )
        ],
        child: BlocBuilder<UserPathBloc, UserPathState>(
          builder: (context, state) {
            // TODO: change once smarter rebuilds are ready
            context
                .read<UserPathBloc>()
                .add(UserPathLoginDataChanged(widget.settings));

            print("rebuild");
            final _istate = state as MainUserPathState;
            // make markers
            final List<Marker> markers = [];

            if (state.livePoints.isNotEmpty) {
              markers.add(Marker(
                width: 500,
                height: 100,
                point: state.livePoints.last.asLatLng,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: [
                    GestureDetector(
                      onTap: () => showUserLocationModalBottomSheet(
                          context, widget.device),
                      child: Container(
                        decoration: BoxDecoration(
                            color: Colors.black.withOpacity(0.85),
                            // border: Border.all(color: Colors.lightBlue, width: 2),  TODO: add border
                            borderRadius: BorderRadius.circular(10),
                            boxShadow: const [
                              // BoxShadow(color: Colors.black, blurRadius: 4)
                            ]),
                        padding: const EdgeInsets.all(8),
                        child: Text(
                          "${widget.device.$1}:${widget.device.$2}",
                          softWrap: false,
                        ),
                      ),
                    ),
                    const Icon(
                      Icons.location_history,
                      size: 32,
                    )
                  ],
                ),
                alignment: Alignment.topCenter,
                rotate: true,
              ));
            }

            // Create fancy fade-out and blended line  (TODO: make distance based. use flutter_map_math)
            List<List<LatLng>> segments = [];
            List<Color> colors = [];
            if (state.initialPoints.isNotEmpty) {
              final allPoints =
                  state.initialPoints.map((e) => LatLng(e.lat, e.lon)).toList();
              final segmentCount = math.min(100, allPoints.length);
              final pointsPerSegment = (allPoints.length / segmentCount).ceil();

              // Split the points into segments and generate colors
              for (int i = 0; i < allPoints.length; i += pointsPerSegment) {
                int end = math.min(i + pointsPerSegment + 1, allPoints.length);
                segments.add(allPoints.sublist(i, end));

                // Calculate the color for the segment
                double ratio = i / allPoints.length;
                Color color = Color.lerp(Colors.purple, Colors.blue, ratio)!;
                colors.add(color);
              }
            }

            // Create polylines for each segment with the corresponding color
            List<Polyline> polylines = [];
            for (int i = 0; i < segments.length; i++) {
              polylines.add(
                Polyline(
                  points: segments[i],
                  strokeWidth: 4.0,
                  color: colors[i].withOpacity(
                      (math.pow(i, 2) / math.pow(segments.length, 2)) * 0.7 +
                          0.3), // Fading effect
                ),
              );
            }

            return Stack(
              children: [
                PolylineLayer(
                  key: ValueKey('${widget.device}_historyLines'),
                  polylines: [
                    /*
                    Polyline(
                      points: state.initialPoints
                          .map((e) => LatLng(e.lat, e.lon))
                          .toList(),
                      strokeWidth: 4.0,
                      color: Colors.blue,
                    ),

                     */
                    ...polylines
                  ],
                ),
                PolylineLayer(
                    key: ValueKey('${widget.device}_liveLines'),
                    polylines: [
                      Polyline(
                        points: state.livePoints
                            .map((e) => LatLng(e.lat, e.lon))
                            .toList(),
                        strokeWidth: 4.0,
                        color: Colors.blue.shade200,
                      ),
                    ]),
                MarkerLayer(markers: markers)
              ],
            );
          },
        ),
      ),
    );
  }
}

showUserLocationModalBottomSheet(BuildContext context, (String, String) user) {
  showModalBottomSheet(
    context: context,
    builder: (bsContext) {
      return Container(
        // height: MediaQuery.of(bsContext).size.height * 0.5,
        width: MediaQuery.of(bsContext).size.width,
        height: 500,
        decoration: const BoxDecoration(
          color: Colors.black,
          borderRadius: BorderRadius.only(
              topLeft: Radius.circular(30), topRight: Radius.circular(30)),
        ),
        padding: const EdgeInsets.all(32),
        child: StreamBuilder<UserPathState>(
          stream: context.read<UserPathBloc>().stream,
          builder: (sheetContext, state) {
            final istate = state.data as MainUserPathState? ??
                context.read<UserPathBloc>().state as MainUserPathState;
            if (istate.livePoints.isEmpty) {
              return Text("Couldn't find ${user.$1}:${user.$2}'s Location");
            }
            final curLocation = istate.livePoints.last;
            return Column(
              // mainAxisSize: MainAxisSize.min,
              children: [
                Text(
                  '${user.$1}:${user.$2}',
                  style: const TextStyle(
                    fontSize: 24,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                Container(
                  decoration: BoxDecoration(
                    color: Colors.black,
                    border: Border.all(color: Colors.orange, width: 2),
                    borderRadius: BorderRadius.circular(10),
                  ),
                  padding: const EdgeInsets.all(16),
                  width: double.infinity,
                  child: Column(
                    children: [
                      Text(
                          "(${curLocation.lat.toStringAsFixed(4)}, ${curLocation.lon.toStringAsFixed(4)})"),
                      Text(DateFormat('dd.MM.yyyy - kk:mm:ss')
                          .format(curLocation.timestamp)),
                      StreamBuilder(
                        stream: Stream.periodic(const Duration(seconds: 1)),
                        builder: (context, _) {
                          return Text(
                              "${formatDuration(DateTime.now().difference(curLocation.timestamp))} ago");
                        },
                      ),
                    ],
                  ),
                ),
                const SizedBox(
                  height: 16,
                ),
                Expanded(
                  // Ensure GridView.builder is within an Expanded widget
                  child: BlocBuilder<GlobalLocationStoreCubit,
                      GlobalLocationStoreState>(
                    bloc: GetIt.I.get<GlobalLocationStoreCubit>(),
                    builder: (sheetContext, state) {
                      // get map camera
                      final mapController = MapController.of(context);

                      final mapRotation = mapController.camera.rotation;

                      List<MapEntry<(String, String), Point>> locations = state
                          .locations
                          .remove(user) // remove this
                          .entries // get entries into a list, and sort alphabetically
                          .toList()
                        ..sort((a, b) => "${a.key.$1}:${a.key.$2}"
                            .compareTo("${b.key.$1}:${b.key.$2}"));
                      if (locations.isEmpty) {
                        return const SizedBox();
                      }
                      return GridView.builder(
                        gridDelegate:
                            const SliverGridDelegateWithFixedCrossAxisCount(
                                crossAxisCount: 1,
                                crossAxisSpacing: 4.0,
                                mainAxisSpacing: 4.0,
                                mainAxisExtent: 100),
                        itemCount: locations.length,
                        itemBuilder: (BuildContext context, int index) {
                          // calculate distance and bearing
                          double distance = distanceBetween(
                              curLocation.lat,
                              curLocation.lon,
                              locations[index].value.lat,
                              locations[index].value.lon,
                              "meters");

                          double bearing = (bearingBetween(
                                    curLocation.lat,
                                    curLocation.lon,
                                    locations[index].value.lat,
                                    locations[index].value.lon,
                                  ) +
                                  mapRotation) %
                              360;

                          print(distance);
                          print(bearing);

                          return Center(
                            child: Container(
                              margin: const EdgeInsets.all(8),
                              decoration: BoxDecoration(
                                color: Colors.black,
                                border:
                                    Border.all(color: Colors.pink, width: 2),
                                borderRadius: BorderRadius.circular(10),
                              ),
                              padding: const EdgeInsets.all(16),
                              child: Column(
                                children: [
                                  Row(
                                    children: [
                                      Text(
                                        "${locations[index].key.$1}:${locations[index].key.$2}",
                                        style: const TextStyle(
                                            fontWeight: FontWeight.bold),
                                      ),
                                      const Spacer(),
                                      Text(formatDistance(distance ~/ 1)),
                                      Transform.rotate(
                                        angle: bearing * (math.pi / 180),
                                        child: const Icon(
                                          Icons.arrow_upward,
                                          color: Colors.blue,
                                        ),
                                      )
                                    ],
                                  ),
                                  Row(
                                    children: [
                                      StreamBuilder(
                                        stream: Stream.periodic(
                                            const Duration(seconds: 1)),
                                        builder: (context, _) {
                                          return Text(
                                              "${formatDuration(DateTime.now().difference(locations[index].value.timestamp))} ago",
                                              style: const TextStyle(
                                                  fontSize: 12));
                                        },
                                      ),
                                      const Spacer(),
                                    ],
                                  ),
                                ],
                              ),
                            ),
                          );
                        },
                      );
                    },
                  ),
                ),
              ],
            );
          },
        ),
      );
    },
  );
}

class TrackerSelector extends StatefulWidget {
  final MapController mapController;

  const TrackerSelector({super.key, required this.mapController});

  @override
  State<TrackerSelector> createState() => _TrackerSelectorState();
}

class _TrackerSelectorState extends State<TrackerSelector> {
  bool _isExpanded = false;

  @override
  Widget build(BuildContext context) {
    return AnimatedContainer(
      duration: const Duration(milliseconds: 200),
      width: _isExpanded ? MediaQuery.of(context).size.width - 32 : 48,
      height: 48,
      decoration: BoxDecoration(
        color: Colors.black87,
        borderRadius: BorderRadius.circular(24),
      ),
      child: Row(
        children: [
          IconButton(
            icon: Icon(_isExpanded ? Icons.close : Icons.people),
            onPressed: () {
              setState(() {
                _isExpanded = !_isExpanded;
              });
            },
          ),
          if (_isExpanded)
            Expanded(
              child: BlocBuilder<GlobalLocationStoreCubit,
                  GlobalLocationStoreState>(
                bloc: GetIt.I.get<GlobalLocationStoreCubit>(),
                builder: (context, state) {
                  return ListView.builder(
                    scrollDirection: Axis.horizontal,
                    itemCount: state.locations.length,
                    itemBuilder: (context, index) {
                      final entry = state.locations.entries.elementAt(index);
                      return GestureDetector(
                        onTap: () => widget.mapController
                            .moveAndRotate(entry.value.asLatLng, 15, 0),
                        child: Container(
                          padding: const EdgeInsets.symmetric(horizontal: 8),
                          child: Column(
                            mainAxisAlignment: MainAxisAlignment.center,
                            children: [
                              const Icon(
                                Icons.location_history,
                                color: Colors.white,
                                size: 24,
                              ),
                              Text(
                                "${entry.key.$1}:${entry.key.$2}",
                                style: const TextStyle(
                                  color: Colors.white,
                                  fontSize: 12,
                                ),
                              ),
                            ],
                          ),
                        ),
                      );
                    },
                  );
                },
              ),
            ),
        ],
      ),
    );
  }
}