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

import 'package:dio/dio.dart';
import 'package:EasyDartModule/base/discovery/Discovery.dart';

class NacosDiscovery implements Discovery {
  // final String host;
  // final String namespaceId;
  final DiscoveryConfig config;
  final Dio dio;
  bool healthCheck = true;

  NacosDiscovery(this.config) : dio = Dio(BaseOptions(baseUrl: config.host));

  // 注册实例到 Nacos
  @override
  Future<bool> registerInstance(String serviceName, String ip, int port,
      {String groupName = 'DEFAULT_GROUP'}) async {
    bool register = false;
    try {
      //获取本机网卡ip
      String? nip;
      for (var interface in await NetworkInterface.list()) {
        for (var addr in interface.addresses) {
          if (addr.address.startsWith(ip)) {
            nip = addr.address;
            break;
          }
        }
        if (nip != null) {
          break;
        }
      }
      final response = await dio.post(
        '/nacos/v2/ns/instance',
        queryParameters: {
          'serviceName': serviceName,
          'ip': nip ?? ip,
          'port': port,
          'groupName': groupName,
          'namespaceId': config.namespaceId,
          'ephemeral': true
        },
      );
      if (response.statusCode == 200) {
        print('服务注册成功: $serviceName');
        healthCheck = true;
        //启动定时器 更新服务健康状态
        Future.doWhile(() async {
          if (healthCheck) {
            await Future.delayed(Duration(seconds: 5), () async {
              //发送心跳包
              try {
                final rr = await dio
                    .put("/nacos/v1/ns/instance/beat", queryParameters: {
                  'serviceName': serviceName,
                  'ip': nip ?? ip,
                  'port': port,
                  'groupName': groupName,
                  'namespaceId': config.namespaceId,
                });
                if (rr.data["code"] != 10200) {
                  print(rr);
                }
                //判断心跳是否发送成功
                if (rr.data["code"] == 20404) {
                  //实例未注册 重新注册实例
                  healthCheck = false;
                  registerInstance(serviceName, ip, port, groupName: groupName);
                }
              } catch (e) {
                print(e);
              }
            });
          }
          return healthCheck;
        }).then((v) {
          print("心跳线程结束");
        });
        // Timer.periodic(Duration(seconds: 5), (timer) async {
        //   //判断是否取消注册
        //   if (!healthCheck) {
        //     timer.cancel();
        //     return;
        //   }
        // });
        register = true;
      } else {
        print('服务注册失败: ${response.statusCode} - ${response.data}');
      }
    } catch (e) {
      print('请求失败: $e');
    }
    if (!register) {
      //延迟两秒继续请求
      await Future.delayed(Duration(seconds: 2));
      return await registerInstance(serviceName, ip, port,
          groupName: groupName);
    }
    return register;
  }

  // 注销实例
  @override
  Future<bool> deRegisterInstance(String serviceName, String ip, int port,
      {String groupName = 'DEFAULT_GROUP'}) async {
    try {
      final response = await dio.delete(
        '/nacos/v2/ns/instance',
        queryParameters: {
          'serviceName': serviceName,
          'ip': ip,
          'port': port,
          'groupName': groupName,
          'namespaceId': config.namespaceId,
        },
      );
      if (response.statusCode == 200) {
        print('服务注销成功: $serviceName');
        //标记心跳线程为退出状态
        healthCheck = false;
        return true;
      } else {
        print('服务注销失败: ${response.statusCode} - ${response.data}');
        return false;
      }
    } catch (e) {
      print('请求失败: $e');
      return false;
    }
  }

  // 获取服务实例列表
  @override
  Future<List<Map<String, dynamic>>> getInstanceList(String serviceName,
      {String groupName = 'DEFAULT_GROUP'}) async {
    try {
      final response = await dio.get(
        '/nacos/v2/ns/instance/list',
        queryParameters: {
          'serviceName': serviceName,
          'groupName': groupName,
          'namespaceId': config.namespaceId,
          'healthyOnly': true,
        },
      );
      if (response.statusCode == 200) {
        final instances = response.data["data"]['hosts'];
        // print('服务实例列表: $instances');
        return List<Map<String, dynamic>>.from(instances);
      } else {
        print('获取服务实例列表失败: ${response.statusCode} - ${response.data}');
        return [];
      }
    } catch (e) {
      print('请求失败: $e');
      return [];
    }
  }

  // 获取配置
  @override
  Future<String> getConfig(String dataId,
      {String group = 'DEFAULT_GROUP'}) async {
    try {
      final response = await dio.get(
        '/nacos/v2/cs/config',
        queryParameters: {
          'dataId': dataId,
          'group': group,
          'namespaceId': config.namespaceId,
        },
      );
      if (response.statusCode == 200) {
        // print('获取配置成功: ${response.data}');
        return response.data["data"];
      } else {
        print('获取配置失败: ${response.statusCode} - ${response.data}');
        return '';
      }
    } catch (e) {
      print('请求失败: $e');
      return '';
    }
  }

  // 发布配置
  @override
  Future<bool> publishConfig(
      String dataId, String group, String content) async {
    try {
      final response = await dio.post(
        '/nacos/v2/cs/config',
        queryParameters: {
          'dataId': dataId,
          'group': group,
          'namespaceId': config.namespaceId,
          'content': content,
        },
      );
      if (response.statusCode == 200) {
        print('配置发布成功: $dataId');
        return true;
      } else {
        print('配置发布失败: ${response.statusCode} - ${response.data}');
        return false;
      }
    } catch (e) {
      print('请求失败: $e');
      return false;
    }
  }

  // 删除配置
  @override
  Future<bool> deleteConfig(String dataId, String group) async {
    try {
      final response = await dio.delete(
        '/nacos/v2/cs/config',
        queryParameters: {
          'dataId': dataId,
          'group': group,
          'namespaceId': config.namespaceId,
        },
      );
      if (response.statusCode == 200) {
        print('配置删除成功: $dataId');
        return true;
      } else {
        print('配置删除失败: ${response.statusCode} - ${response.data}');
        return false;
      }
    } catch (e) {
      print('请求失败: $e');
      return false;
    }
  }
}