import 'dart:convert';

import 'package:fis_common/logger/logger.dart';
import 'package:fis_jsonrpc/services/notificationdecoder.dart';

import 'connection.dart';
import 'core/center.dart';
import 'core/interface/connection.dart';
import 'handler.dart';

/// WebSocket消息中心
class WsNotificationCenter extends NotificationCenter {
  String? _host;
  WsConnection? _connection;

  WsNotificationCenter() {
    NotificationDecoder.setup();
  }

  @override
  IConnection get connection => _connection!;

  String get host => _host ?? '';

  /// 设置主机地址
  ///
  /// [host] 主机地址
  void setHost(String host) {
    _host = host;
  }

  /// 注册消息处理器
  ///
  /// [handler] 消息处理器
  void register<T>(NotificationHandler<T> handler) {
    handlerDispatcher.register(handler);
  }

  @override
  void start() {
    logger.i("Start WsNotificationCenter");
    _buildConnection();
    super.start();
  }

  @override
  void stop() {
    if (_connection == null) return;

    logger.i("Stop WsNotificationCenter");
    super.stop();
  }

  @override
  void process(String data) {
    final jsonMap = jsonDecode(data);
    final typeInt = jsonMap['NotificationType'] as int;
    logger.i('WsNotificationCenter received a message, type: $typeInt.');
    final handler = handlerProvider.getHandler(typeInt);
    if (handler != null) {
      final message = NotificationDecoder.decode(jsonMap);
      handler.execute(message);
      logger.i('WsNotificationCenter message[type-$typeInt] handled.');
    }
  }

  void _buildConnection() {
    if (_host == null || _host!.isEmpty) {
      throw Exception("WsNotificationCenter host is not valid.");
    }
    if (_connection == null) {
      _connection = WsConnection(_host!);
    } else {
      if (_connection!.host != _host) {
        _connection!.close();
        _connection = WsConnection(_host!);
      }
    }
  }
}

enum WSType {
  Main,
  Consultation,
  QRCodeLogin,
}