import 'dart:async';
import 'dart:convert';

import 'package:flutter_map/src/entity/map_location.dart';
import 'package:injectable/injectable.dart';
import 'package:location/data/repositories/friends_repository.dart';
import 'package:location/di/get_it.dart';
import 'package:location/socket/base_message.dart';
import 'package:location/socket/socket_constants.dart';
import 'package:location/utils/async_util.dart';
import 'package:location/utils/atmob_log.dart';
import 'package:location/utils/base_expand.dart';
import 'package:web_socket_channel/web_socket_channel.dart';
import '../data/bean/location_info.dart';
import '../data/repositories/account_repository.dart';
import '../data/repositories/contact_repository.dart';
import '../data/repositories/message_repository.dart';
import 'location_message.dart';

typedef OnLocationChangeListener = void Function(List<LocationInfo> data);

@lazySingleton
class AtmobLocationClient {
  static final String tag = 'AtmobLocationClient';

  static final List<OnLocationChangeListener> _locationListeners = [];

  WebSocketChannel? _webSocket;
  StreamSubscription? _subscription;
  bool _isConnecting = false;
  CancelableFuture? cancelableFuture;

  AtmobLocationClient() {
    startWebsocketInternal();
  }

  static AtmobLocationClient getAtmobLocationClient() {
    return getIt.get<AtmobLocationClient>();
  }

  static void connectWebSocket() {
    AtmobLog.d(tag, 'connectWebSocket');
    AtmobLocationClient client = getIt.get<AtmobLocationClient>();
    client.startWebsocketInternal();
  }

  static void disConnectWebSocket() {
    AtmobLog.d(tag, 'disConnectWebSocket');
    AtmobLocationClient client = getIt.get<AtmobLocationClient>();
    client.stopWebsocketInternal();
  }

  void startWebsocketInternal() {
    if (AccountRepository.token == null ||
        AccountRepository.token?.isEmpty == true ||
        _isConnecting) {
      return;
    }
    cancelableFuture?.cancel();

    cancelableFuture = AsyncUtil.retryWithExponentialBackoff(
        () => _startConnect(), 4,
        initialInterval: Duration(seconds: 2));
    cancelableFuture!.catchError((error) {
      AtmobLog.d(tag, '重试最大次数 异常 error:$error');
      startWebsocketInternal();
    });
  }

  void stopWebsocketInternal() {
    AtmobLog.d(tag, 'stopWebsocketInternal');
    cancelableFuture?.cancel();
    _disposePreviousConnection();
  }

  void _disposePreviousConnection() {
    _webSocket?.sink.close();
    _webSocket = null;

    _subscription?.cancel();
    _subscription = null;

    _isConnecting = false;
  }

  Future<void> _startConnect() async {
    AtmobLog.d(tag, '_startConnect');

    _disposePreviousConnection();

    final webSocket = WebSocketChannel.connect(Uri.parse(
        '${SocketConstants.locationBaseUrl}${AccountRepository.token}'));

    _webSocket = webSocket;

    try {
      await webSocket.ready;
      AtmobLog.d(tag, 'webSocket 连接成功');
      _isConnecting = true;
    } catch (e) {
      AtmobLog.d(tag, 'webSocket 连接失败 error:$e');
      rethrow;
    }

    _subscription = webSocket.stream
        .map((s) {
          AtmobLog.d(tag, 'webSocket receive:$s');
          try {
            Map<String, dynamic> data = jsonDecode(s);
            return BaseMessage.fromJson(data);
          } catch (e) {
            AtmobLog.d(tag, 'BaseMessage jsonDecode error:$e');
          }
          return null;
        })
        .where((message) {
          if (message == null || message.cmd == null) {
            return false;
          }
          switch (message.cmd) {
            case SocketConstants.refreshFriendList:
              FriendsRepository.getInstance().refreshFriends();
              break;
            case SocketConstants.refreshFriendRequest:
              FriendsRepository.getInstance().refreshFriendRequestList();
              break;
            case SocketConstants.refreshFriendMessage:
              MessageRepository.getInstance().requestMessageList();
              break;
            case SocketConstants.refreshContact:
              ContactRepository.getInstance().refreshContactList();
              break;
            case SocketConstants.refreshMember:
              AccountRepository.getInstance().refreshMemberStatus();
              break;
          }
          return SocketConstants.receiveFriendBatchLocation == message.cmd;
        })
        .map((message) => message?.data)
        .where((data) => data != null)
        .cast<String>()
        .map((s) {
          try {
            List<dynamic> jsonList = jsonDecode(s);
            return jsonList.map((e) => LocationInfo.fromJson(e)).toList();
          } catch (e) {
            AtmobLog.d(tag, 'List<LocationInfo> jsonDecode error:$e');
          }
        })
        .bufferTime(Duration(seconds: 5))
        .where((locationInfos) => locationInfos.isNotEmpty)
        .map((lists) {
          Map<String, LocationInfo> idLocation = {};
          for (var list in lists) {
            if (list == null || list.isEmpty) {
              continue;
            }
            for (var location in list) {
              String? userId = location.userId;
              if (userId == null ||
                  location.longitude == 0 ||
                  location.latitude == 0) {
                continue;
              }
              idLocation[userId] = location;
            }
          }
          return idLocation.values.toList();
        })
        .listen(
          _handleLocationMessage,
          onError: _handleError,
          onDone: _handleDisconnect,
        );
  }

  void _handleLocationMessage(List<LocationInfo> data) {
    AtmobLog.d(tag, '接收到位置信息: ${data.length}');
    for (var listener in _locationListeners) {
      listener(data);
    }
  }

  // 断开处理
  void _handleDisconnect() {
    AtmobLog.e(tag, 'WebSocket 断开连接');
    _isConnecting = false;
    startWebsocketInternal();
  }

  void _handleError(error) {
    AtmobLog.e(tag, 'WebSocket 错误: $error');
  }

  static void addLocationListener(OnLocationChangeListener listener) {
    _locationListeners.add(listener);
  }

  static void removeLocationListener(OnLocationChangeListener listener) {
    _locationListeners.remove(listener);
  }

  void _sendMessage(String msg) {
    if (_webSocket == null) {
      return;
    }
    _webSocket!.sink.add(msg);
    AtmobLog.d(tag, 'send location: $msg');
  }

  void uploadLocation(MapLocation location) {
    if (_webSocket == null ||
        location.latitude == 0 && location.longitude == 0) {
      return;
    }
    _sendMessage(LocationMessage.obtainMessage(location));
  }
}