import 'package:bus_infotainment/backend/live_information.dart';
import 'package:bus_infotainment/remaster/dashboard.dart';
import 'package:bus_infotainment/tfl_datasets.dart';

import 'package:bus_infotainment/utils/OrdinanceSurveyUtils.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart' hide NavigationBar;
import 'package:flutter/widgets.dart';
import 'package:geolocator/geolocator.dart';
import 'package:shadcn_ui/shadcn_ui.dart';
import 'package:vector_math/vector_math.dart' hide Colors;

import '../backend/modules/tube_info.dart';

class SearchArc extends StatefulWidget {

  @override
  State<SearchArc> createState() => _SearchArcState();
}

class _SearchArcState extends State<SearchArc> {
  TextEditingController searchController = TextEditingController();

  @override
  Widget build(BuildContext context) {

    List<Widget> nearbyRoutes = _getNearbyRoutes(context);
    List<Widget> pastRoutes = _getPastRoutes(context);

    List<Widget> routeCards = [];

    if (searchController.text.isNotEmpty) {
      // Detect if the search query is a route number
      // Examples of route numbers: 1, A1, 1A, A1A ...
      // If it isnt a route number, it is a stop name
      // Examples of stop names: "Euston Station", "Baker Street", "Kings Cross"
      bool containsNumber = RegExp(r'\d').hasMatch(searchController.text);

      List<BusRoute> searchResults = [];

      // Loop through all bus routes
      for (BusRoute route in LiveInformation().busSequences.routes.values) {
        if (containsNumber) {
          if (route.routeNumber.contains(searchController.text) && !searchResults.contains(route)) {
            routeCards.add(_getRouteCard(context, route));
            searchResults.add(route);
          }
        } else {
          for (BusRouteVariant variant in route.routeVariants.values) {
            for (BusRouteStop stop in variant.busStops) {
              if (stop.formattedStopName.toLowerCase().contains(
                  searchController.text.toLowerCase()) && !searchResults.contains(route)) {
                routeCards.add(_getRouteCard(context, route));
                searchResults.add(route);
                break;
              }
            }
          }
        }
      }

      if (routeCards.isEmpty){
        routeCards.add(
          Text("No results found", style: ShadTheme.of(context).textTheme.h3,)
        );
      }

    }

    return Scaffold(
      body: Row(
        children: [
          Expanded(
            child: Container(
              padding: EdgeInsets.fromLTRB(32, 16, 32, 0),
              height: MediaQuery.of(context).size.height,
              child: Column(
                mainAxisSize: MainAxisSize.max,
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  ShadInput(
                    placeholder: Text("Search for route or stop (Can be laggy)"),
                    controller: searchController,
                    onChanged: (value) {
                      setState(() {
                        // Update search results
                      });
                    },
                  ),
                  SizedBox(height: 8),
                  if (routeCards.isNotEmpty)
                    Expanded(
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(
                            "Search results",
                            style: ShadTheme.of(context).textTheme.h3,
                          ),
                          SizedBox(height: 10),
                          Expanded(
                            child: GridView.extent(
                              shrinkWrap: true,
                              maxCrossAxisExtent: 100,
                              scrollDirection: Axis.vertical,
                              crossAxisSpacing: 8,
                              mainAxisSpacing: 8,
                              children: routeCards,
                            ),
                          ),
                        ],
                      ),
                    )
                  else
                    Expanded(
                      child: Row(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Expanded(
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              mainAxisSize: MainAxisSize.min,
                              children: [
                                Text(
                                  "Nearby routes",
                                  style: ShadTheme.of(context).textTheme.h3,
                                ),
                                SizedBox(height: 10),
                                Expanded(
                                  child: GridView.extent(
                                    shrinkWrap: true,
                                    maxCrossAxisExtent: 100,
                                    scrollDirection: Axis.vertical,
                                    crossAxisSpacing: 8,
                                    mainAxisSpacing: 8,
                                    children: _getNearbyRoutes(context, multiMode: true),
                                  ),
                                ),
                              ],
                            ),
                          )
                        ],
                      ),
                    ),
                ],
              ),
            ),
          ),

          Container(
            width: 2,
            color: Colors.grey.shade300,
          ),

          RotatedBox(
            quarterTurns: 3,
            child: NavigationBar(),
          )
        ],
      ),
    );
  }
}

List<Widget> _getNearbyRoutes(context, {bool multiMode = false}) {

  print("Getting nearby routes");

  LiveInformation liveInformation = LiveInformation();
  BusSequences busSequences = liveInformation.busSequences;

  List<BusRoute> nearbyRoutes = [];

  Position? currentLocation = liveInformation.trackerModule.position;

  Vector2 currentVector = Vector2(0, 0);

  if (currentLocation == null && !kDebugMode) {
    return [];
  } else if (currentLocation != null){
    currentVector = OSGrid.toNorthingEasting(currentLocation!.latitude, currentLocation.longitude);
  }



  if (kDebugMode) {
    currentVector = OSGrid.toNorthingEasting(51.583781262560926, -0.020359583104595073);
  }

  for (BusRoute route in busSequences.routes.values) {
    for (BusRouteVariant variant in route.routeVariants.values) {
      for (BusRouteStop stop in variant.busStops) {

        Vector2 stopVector = Vector2(stop.easting.toDouble(), stop.northing.toDouble());

        double distance = currentVector.distanceTo(stopVector);

        if (distance < 1000) {
          nearbyRoutes.add(route);
          break;
        }
      }
      if (nearbyRoutes.contains(route)) {
        break;
      }
    }
    if (nearbyRoutes.contains(route)) {
      continue;
    }
  }

  List<Widget> routeCards = [];

  for (BusRoute route in nearbyRoutes) {
    routeCards.add(_getRouteCard(context, route, multiMode: multiMode));
  }

  return routeCards;

}

Widget _getRouteCard(context, BusRoute route, {bool multiMode = false}) {

  String rr = "";

  if (route.routeNumber.toLowerCase().startsWith("ul")) {

    rr = "Rail replacement";

    TubeLine? line = LiveInformation().tubeStations.getClosestLine(route.routeVariants.values.first);

    rr = line?.name ?? rr;

    if (!["London Overground", "DLR", "Rail replacement", "Elizabeth Line"].contains(rr)) {
      rr += " line";
    }
    if (rr == "Hammersmith and City line") {
      rr = "Hammersmith & City";
    }

  }

  return ElevatedButton(
    onPressed: () {
      showShadSheet(
          side: ShadSheetSide.right,
          context: context,
          builder: (context) {

            List<Widget> variantWidgets = [];

            for (BusRouteVariant variant in route.routeVariants.values) {
              variantWidgets.add(
                  ShadButton.outline(
                    text: Container(
                      width: 274,
                      alignment: Alignment.centerLeft,
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text("${variant.busStops.first.formattedStopName} ->"),
                          const SizedBox(
                            height: 2,
                          ),
                          Text(variant.busStops.last.formattedStopName)
                        ],
                      ),
                    ),
                    width: double.infinity,
                    height: 50,
                    padding: const EdgeInsets.all(8),
                    onPressed: () async {
                      LiveInformation liveInformation = LiveInformation();
                      await liveInformation.setRouteVariant(variant);

                      if (!multiMode) {
                        Navigator.popAndPushNamed(context, "/enroute");
                      } else {
                        Navigator.popAndPushNamed(context, "/multi/enroute");
                      }

                    },
                  )
              );

              variantWidgets.add(const SizedBox(
                height: 4,
              ));
            }

            return ShadSheet(
              title: Text("Route ${route.routeNumber} - Variants"),

              content: Container(
                width: 300,
                height: MediaQuery.of(context).size.height - 52,
                child: Scrollbar(
                  thumbVisibility: true,
                  child: ListView(
                    shrinkWrap: true,
                    children: [
                      ...variantWidgets
                    ],
                  ),
                ),
              ),
              padding: const EdgeInsets.all(8),
            );


          }


      );
    },
    child: Column(
      mainAxisSize: MainAxisSize.min,
      children: [

        Text(
          "Route \n ${route.routeNumber}",
          style: ShadTheme.of(context).textTheme.h4.copyWith(
              height: 1.1
          ),
          textAlign: TextAlign.center,
        ),
        if (route.routeNumber.toLowerCase().startsWith("ul"))
          Text(rr, style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w400, height: 1), textAlign: TextAlign.center,)


      ],
    ),

    style: ElevatedButton.styleFrom(
      padding: EdgeInsets.all(10),
      shape: RoundedRectangleBorder(
        borderRadius: BorderRadius.circular(10),
      ),
    ),
  );;
}

List<Widget> _getPastRoutes(context) {
  return [];
}