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

import 'package:flutter/material.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:together_mobile/database/hive_database.dart';
import 'package:web_socket_channel/web_socket_channel.dart';
import 'package:web_socket_channel/status.dart' as status;

import 'package:together_mobile/models/route_state_model.dart';
import 'package:together_mobile/database/box_type.dart';
import 'package:together_mobile/models/apply_list_model.dart';
import 'package:together_mobile/models/contact_model.dart';
import 'package:together_mobile/models/init_get_it.dart';
import 'package:together_mobile/models/user_model.dart';
import 'package:together_mobile/notification_api.dart';

enum SocketStatus {
  connected,
  reconnecting,
  error,
  closed,
}

class WebSocketManager extends ChangeNotifier {
  late Uri wsUrl;
  late WebSocketChannel channel;
  String id = '';
  SocketStatus socketStatus = SocketStatus.closed;
  Timer? heartBeatTimer;
  Timer? serverTimer;
  Timer? reconnectTimer;
  int reconnectCount = 5;
  int reconnectTimes = 0;
  Duration heartBeatTimeout = const Duration(seconds: 4);
  Duration reconnectTimeout = const Duration(seconds: 3);

  void connect(String userId, bool isReconnect) {
    id = userId;
    wsUrl = Uri.parse('ws://10.0.2.2:8000/ws/$id?is_reconnect=$isReconnect');
    if (isReconnect) {
      socketStatus = SocketStatus.reconnecting;
      notifyListeners();
    }
    // This doesn't blcok the programe whethe it connect the server or not
    // So heartBeat will be executre straightly
    channel = WebSocketChannel.connect(wsUrl);
    heartBeatInspect();

    channel.stream.listen(onData, onError: onError, onDone: onDone);
  }

  void disconnect() {
    channel.sink.close();
    wsUrl = Uri();
    id = '';
    socketStatus = SocketStatus.closed;
    notifyListeners();
    heartBeatTimer?.cancel();
    serverTimer?.cancel();
    reconnectTimer?.cancel();
    heartBeatTimer = null;
    serverTimer = null;
    reconnectTimer = null;
    reconnectTimes = 0;
  }

  void onData(jsonData) {
    // If socket can receive msg, that means connection is estabilished
    socketStatus = SocketStatus.connected;
    notifyListeners();
    print('websocket connected <$channel>');
    if (reconnectTimer != null) {
      reconnectTimer!.cancel();
      reconnectTimer = null;
      reconnectTimes = 0;
    }

    heartBeatInspect();

    Map<String, dynamic> data = json.decode(jsonData);
    switch (data['event']) {
      case 'friend-chat-msg':
        receiveFriendMsg(data, true);
      case 'apply-friend':
        receiveApplyFriend(data);
      case 'friend-added':
        receiveFriendAdded(data);
      case 'friend-deleted':
        receiveFriendDeleted(data);
      case 'chat-image':
        receiveChatImages(data);
      case 'group-chat-creation':
        receiveGroupChatCreation(data);
      case 'group-chat-msg':
        receiveGroupChatMsg(data, true);
    }
  }

  // This will be trigger while server or client close the connection
  // for example server is restarting
  void onDone() {
    print('websocket disconnected <$channel>');
    print('22222222222222222222');
    if (socketStatus == SocketStatus.closed) {
      // Client close the connection
      return;
    }
    if (socketStatus == SocketStatus.connected) {
      // Server close the connection
      socketStatus = SocketStatus.reconnecting;
      notifyListeners();
      print(111111111111111);
      reconnectTimes++;
      reconnect();
    }
    if (reconnectTimes >= reconnectCount) {
      socketStatus = SocketStatus.error;
      reconnectTimes = 0;
    } else {
      socketStatus = SocketStatus.reconnecting;
      print('3333333333333333333');
      notifyListeners();
    }
  }

  // This will be trigger while server exactly shutdown
  void onError(Object error, StackTrace st) {
    print('Websocket connect occurs error: <$error>');
    // print(st);
    if (reconnectTimes >= reconnectCount) {
      socketStatus = SocketStatus.error;
      notifyListeners();
      channel.sink.close();
      if (heartBeatTimer != null) {
        heartBeatTimer!.cancel();
        heartBeatTimer = null;
      }
    } else {
      print('${reconnectTimes}th reconnection');
      reconnect();
    }
  }

  void heartBeatInspect() {
    print('start heartbeat inspect......');

    if (heartBeatTimer != null) {
      heartBeatTimer!.cancel();
      heartBeatTimer = null;
    }

    if (serverTimer != null) {
      serverTimer!.cancel();
      serverTimer = null;
    }

    heartBeatTimer = Timer(heartBeatTimeout, () {
      channel.sink.add(json.encode({'event': 'ping'}));
      serverTimer = Timer(heartBeatTimeout, () {
        // This will trigger the onDone callback
        channel.sink.close(status.internalServerError);
        socketStatus = SocketStatus.reconnecting;
        notifyListeners();
      });
    });
  }

  void reconnect() {
    if (heartBeatTimer != null) {
      heartBeatTimer!.cancel();
      heartBeatTimer = null;
    }

    if (serverTimer != null) {
      serverTimer!.cancel();
      serverTimer = null;
    }

    if (reconnectTimer != null) {
      reconnectTimer!.cancel();
      reconnectTimer = null;
    }

    reconnectTimer = Timer(reconnectTimeout, () {
      if (reconnectTimes < reconnectCount) {
        print('websocket reconnecting......');
        reconnectTimes++;
        connect(id, true);
      } else {
        print('reconnection times exceed the max times......');
        // If it is still disconnection after reconnect 30 times, set the socket
        // status to error, means the network is bad, and stop reconnecting.
        socketStatus = SocketStatus.error;
        notifyListeners();
        channel.sink.close();
      }
    });
  }
}

void receiveFriendMsg(Map<String, dynamic> msg, bool isShowNotification) async {
  print('=================收到了好友信息事件==================');
  print(msg);
  print('=======================================');
  String senderId = msg['senderId'] as String;
  Box<ChatSetting> chatSettingBox = Hive.box<ChatSetting>('chat_setting');
  Box<MessageT> messageTBox = await HiveDatabase.openMessageBox(senderId);
  ChatSetting? chatSetting = chatSettingBox.get(senderId);
  DateTime dateTime = DateTime.parse(msg['dateTime'] as String);

  if (chatSetting == null) {
    chatSettingBox.put(
      senderId,
      ChatSetting(
        senderId,
        0,
        false,
        true,
        false,
        dateTime,
        1,
      ),
    );
  } else {
    chatSetting.isOpen = true;
    chatSetting.latestDateTime = dateTime;
    chatSetting.unreadCount++;
    chatSettingBox.put(senderId, chatSetting);
  }

  List<String> attachments = List.from(msg['attachments']);
  final DateTime now = DateTime.parse(msg['dateTime'] as String);

  messageTBox.add(
    MessageT(
      msg['msgId'] as int,
      senderId,
      msg['text'],
      msg['type'],
      now,
      msg['isShowTime'],
      attachments,
    ),
  );

  if (!isShowNotification) {
    return;
  }

  String name = getIt.get<Contact>().friends[senderId]!.friendRemark.isEmpty
      ? getIt.get<ContactAccountProfile>().friends[senderId]!.nickname
      : getIt.get<Contact>().friends[senderId]!.friendRemark;

  String routeName = getIt.get<RouteState>().currentPathName;

  String avatar = getIt.get<ContactAccountProfile>().friends[senderId]!.avatar;

  if (!getIt.get<RouteState>().isVisible) {
    NotificationAPI.showMessageNotifications(
      senderId: senderId,
      name: name,
      avatar: avatar,
      text: msg['text'] as String,
    );
  } else if (routeName == 'Message') {
    if (!getIt.get<RouteState>().query.containsValue(senderId)) {
      NotificationAPI.showMessageNotifications(
        senderId: senderId,
        name: name,
        avatar: avatar,
        text: msg['text'] as String,
      );
    }
  } else if (routeName != 'Chat') {
    NotificationAPI.showMessageNotifications(
      senderId: senderId,
      name: name,
      avatar: avatar,
      text: msg['text'] as String,
    );
  }
}

void receiveApplyFriend(Map<String, dynamic> msg) {
  print('=================收到了申请好友事件==================');
  print(msg);
  print('=======================================');
  getIt.get<ApplyList>().addJson(msg);
}

void receiveFriendAdded(Map<String, dynamic> msg) {
  print('=================收到了申请好友通过事件==================');
  print(msg);
  print('=======================================');
  getIt.get<Contact>().addFriend(msg['friendId'], msg['setting']);
  getIt
      .get<ContactAccountProfile>()
      .addFriendAccountProfile(msg['friendId'], msg['accountProfile']);
}

void receiveFriendDeleted(Map<String, dynamic> msg) {
  print('=================收到了解除好友事件==================');
  print(msg);
  print('=======================================');
  getIt.get<Contact>().removeFriend(msg['friendId']);
  getIt.get<ContactAccountProfile>().removeFriend(msg['friendId']);
}

void receiveChatImages(Map<String, dynamic> msg) async {
  print('=================收到了聊天图片事件==================');
  print(msg);
  print('=======================================');
  String chatImageDir = getIt.get<UserProfile>().baseImageDir;
  File file = File('$chatImageDir/${msg['filename']}');
  if (await file.exists()) {
    return;
  } else {
    await file.create(recursive: true);
    await file.writeAsBytes(List<int>.from(msg['bytes']));
  }
}

void receiveGroupChatCreation(Map<String, dynamic> msg) {
  print('=================收到了群聊邀请事件==================');
  print(msg);
  print('=======================================');
  String groupChatId = msg['groupChat']['id'];
  getIt.get<Contact>().addGroupChat(groupChatId);
  getIt.get<ContactAccountProfile>().addGroupChatProfile(groupChatId, msg);
}

void receiveGroupChatMsg(
    Map<String, dynamic> msg, bool isShowNotification) async {
  print('=================收到了群聊信息事件==================');
  print(msg);
  print('=======================================');
  String senderId = msg['senderId'] as String;
  String groupChatId = msg['groupChatId'] as String;
  Box<ChatSetting> chatSettingBox = Hive.box<ChatSetting>('chat_setting');
  Box<MessageT> messageTBox = await HiveDatabase.openMessageBox(groupChatId);
  ChatSetting? chatSetting = chatSettingBox.get(groupChatId);
  DateTime dateTime = DateTime.parse(msg['dateTime'] as String);

  getIt.get<ContactAccountProfile>().addGroupChatMemberProfile(
    groupChatId,
    msg['senderId'],
    {
      'avatar': msg['avatar'],
      'nickname': msg['nickname'],
      'remarkInGroupChat': msg['remarkInGroupChat'],
    },
  );

  if (chatSetting == null) {
    chatSettingBox.put(
      groupChatId,
      ChatSetting(
        groupChatId,
        1,
        false,
        true,
        false,
        dateTime,
        1,
      ),
    );
  } else {
    chatSetting.isOpen = true;
    chatSetting.latestDateTime = dateTime;
    chatSetting.unreadCount++;
    chatSettingBox.put(groupChatId, chatSetting);
  }

  List<String> attachments = List.from(msg['attachments']);
  final DateTime now = DateTime.parse(msg['dateTime'] as String);

  messageTBox.add(
    MessageT(
      msg['msgId'] as int,
      senderId,
      msg['text'],
      msg['type'],
      now,
      msg['isShowTime'],
      attachments,
    ),
  );

  if (!isShowNotification) {
    return;
  }

  String avatar =
      getIt.get<ContactAccountProfile>().groupChats[groupChatId]!.avatar;
  late String name;

  if (getIt.get<Contact>().friends.containsKey(senderId)) {
    if (getIt.get<Contact>().friends[senderId]!.friendRemark.isNotEmpty) {
      name = getIt.get<Contact>().friends[senderId]!.friendRemark;
    } else if ((msg['remarkInGroupChat'] as String).isNotEmpty) {
      name = msg['remarkInGroupChat'];
    } else {
      name = msg['nickname'];
    }
  } else {
    name = (msg['remarkInGroupChat'] as String).isNotEmpty
        ? msg['remarkInGroupChat']
        : msg['nickname'];
  }

  String routeName = getIt.get<RouteState>().currentPathName;

  if (!getIt.get<RouteState>().isVisible) {
    NotificationAPI.showMessageNotifications(
      senderId: senderId,
      name: name,
      avatar: avatar,
      text: msg['text'] as String,
      groupChatId: groupChatId,
    );
  } else if (routeName == 'Message') {
    if (!getIt.get<RouteState>().query.containsValue(senderId)) {
      NotificationAPI.showMessageNotifications(
        senderId: senderId,
        name: name,
        avatar: avatar,
        text: msg['text'] as String,
        groupChatId: groupChatId,
      );
    }
  } else if (routeName != 'Chat') {
    NotificationAPI.showMessageNotifications(
      senderId: senderId,
      name: name,
      avatar: avatar,
      text: msg['text'] as String,
      groupChatId: groupChatId,
    );
  }
}