import 'dart:convert';

import 'package:bus_infotainment/auth/api_constants.dart';
import 'package:bus_infotainment/backend/live_information.dart';
import 'package:bus_infotainment/tfl_datasets.dart';
import 'package:bus_infotainment/utils/audio%20wrapper.dart';
import 'package:bus_infotainment/utils/delegates.dart';
import 'package:appwrite/appwrite.dart' as appwrite;
import 'package:appwrite/models.dart' as models;
import 'package:uuid/uuid.dart';

import '../../auth/auth_api.dart';
import 'info_module.dart';

class CommandModule extends InfoModule {

  final String sessionID;
  late final String clientID;

  List<CommandInfo> _commandHistory = [];
  get commandHistory => _commandHistory;
  EventDelegate<CommandInfo> onCommandReceived = EventDelegate();

  CommandModule(this.sessionID){
    // generate a random client ID
    var uuid = Uuid();

    clientID = uuid.v4();

    if (liveInformation.auth.isAuthenticated()){
      print("Auth is authenticated");
      _setupListener();
    } else {
      print("Auth is not authenticated");
      liveInformation.auth.onLogin.addListener((value) {
        _setupListener();
      });
    }
  }

  // Will execute the command an event which is triggered when a response is received
  Future<EventDelegate> executeCommand(String command) async {
    EventDelegate<String> delegate = EventDelegate();

    final client = liveInformation.auth.client;

    final databases = appwrite.Databases(client);

    if (liveInformation.auth.status == AuthStatus.AUTHENTICATED) {
      final document = await databases.createDocument(
          databaseId: ApiConstants.INFO_Q_DATABASE_ID,
          collectionId: ApiConstants.COMMANDS_COLLECTION_ID,
          documentId: appwrite.ID.unique(),
          data: {
            "session_id": sessionID,
            "command": command,
            "client_id": clientID,
          }
      );
    }

    _onCommandReceived(CommandInfo(command, clientID));

    return delegate;
  }

  Future<void> _onCommandReceived(CommandInfo commandInfo) async {

    commandHistory.add(commandInfo);
    onCommandReceived.trigger(commandInfo);

    print("Received command: ${commandInfo.command}");

    List<String> commandParts = splitCommand(commandInfo.command);
    String command = commandParts[0];
    List<String> args = commandParts.sublist(1);

    if (command == "Response:") {

    }
    else if (command == "announce") {

      final displayText = args[1];

      if (args[0] == "manual") {
        // announce manual <DisplayText> <AudioFileName>... <ScheduledTime>


        List<String> audioFileNames = args.sublist(2);
        try {
          if (int.parse(audioFileNames.last) != null) {
            audioFileNames.removeLast();
          }
        } catch (e) {}

        DateTime scheduledTime = LiveInformation().syncedTimeModule.Now().add(Duration(seconds: 1));
        try {
          if (int.parse(args.last) != null) {
            scheduledTime = DateTime.fromMillisecondsSinceEpoch(int.parse(args.last));
          }
        } catch (e) {}

        liveInformation.announcementModule.queueAnnounceByAudioName(
          displayText: displayText,
          audioNames: audioFileNames,
          scheduledTime: scheduledTime,
          sendToServer: false
        );

      }
      else if (args[0] == "info") {

        int InfoIndex = int.parse(args[1]);

        DateTime scheduledTime = LiveInformation().syncedTimeModule.Now();
        try {
          if (int.parse(args.last) != null) {
            scheduledTime = DateTime.fromMillisecondsSinceEpoch(int.parse(args.last));
          }
        } catch (e) {}

        liveInformation.announcementModule.queueAnnounementByInfoIndex(
          infoIndex: InfoIndex,
          scheduledTime: scheduledTime,
          sendToServer: false
        );
      }
      else if (args[0].startsWith("dest")) {
        // announce destination <RouteNumber> <RouteVariantIndex> <ScheduledTime>

        print("Checkpoint 1");

        String routeNumber = args[1];
        int routeVariantIndex = int.parse(args[2]);

        DateTime scheduledTime = LiveInformation().syncedTimeModule.Now();
        try {
          if (int.parse(args.last) != null) {
            scheduledTime = DateTime.fromMillisecondsSinceEpoch(int.parse(args.last));
          }
        } catch (e) {}

        print("Checkpoint 2");
        BusRoute route = LiveInformation().busSequences.routes[routeNumber]!;
        BusRouteVariant routeVariant = route.routeVariants.values.toList()[routeVariantIndex];

        print("Checkpoint 3");
        liveInformation.announcementModule.queueAnnouncementByRouteVariant(
          routeVariant: routeVariant,
          scheduledTime: scheduledTime,
          sendToServer: false
        );

      }

    }
    else if (command == "setroute") {
      // setroute <RouteNumber> <RouteVariantIndex>

      LiveInformation liveInformation = LiveInformation();

      String routeNumber = args[0];
      int routeVariantIndex = int.parse(args[1]);

      BusRoute route = liveInformation.busSequences.routes[routeNumber]!;
      BusRouteVariant routeVariant = route.routeVariants.values.toList()[routeVariantIndex];

      liveInformation.setRouteVariant_Internal(
        routeVariant
      );
      executeCommand("Response: v \"Client $clientID set its route to ($routeNumber to ${routeVariant.busStops.last.formattedStopName})\"");

    }

  }

  appwrite.RealtimeSubscription? _subscription;
  Future<void> _setupListener() async {
    if (_subscription != null) {
      return;
    }

    final realtime = appwrite.Realtime(LiveInformation().auth.client);

    _subscription = realtime.subscribe(
      ['databases.${ApiConstants.INFO_Q_DATABASE_ID}.collections.${ApiConstants.COMMANDS_COLLECTION_ID}.documents']
    );
    _subscription!.stream.listen((event) {
      print(jsonEncode(event.payload));

      // Only do something if the document was created or updated
      if (!(event.events.first.contains("create") || event.events.first.contains("update"))) {
        return;
      }

      final commandInfo = CommandInfo(event.payload['command'], event.payload['client_id']);

      if (commandInfo.clientID != clientID) {
        _onCommandReceived(commandInfo);
      }

    });

    print("Listening for commands");

    await Future.delayed(Duration(seconds: 90));

    await _subscription!.close();
    _subscription = null;
    _setupListener();

  }

}

class CommandInfo {
  final String command;
  final String clientID;

  CommandInfo(this.command, this.clientID);
}

List<String> splitCommand(String command) {
  var regex = RegExp(r'([^\s"]+)|"([^"]*)"');
  var matches = regex.allMatches(command);
  return matches.map((match) => match.group(0)!.replaceAll('"', '')).toList();
}