using MQTTnet;
using MQTTnet.Protocol;
using MQTTnet.Server;
using System.Text;
namespace MQTTServer.Controllers
{
    public static class MQTTSERVER {

        public static async Task<bool> InitMQTTServerAsync()
        {
            var mqttServer = CreateMqttServer();

            mqttServer.ValidatingConnectionAsync += e =>
            {
                //if (e.ClientId != "ValidClientId")
                //{
                //    e.ReasonCode = MqttConnectReasonCode.ClientIdentifierNotValid;
                //}

                if (e.UserName != "HSClient")
                {
                    e.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
                }

                if (e.Password != "HS202503")
                {
                    e.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
                }

                return Task.CompletedTask;
            };

       
            await StartMqttServer(mqttServer);

            Console.WriteLine("MQTT Server started. Press Enter to exit.");
           // Console.ReadLine();

            //await mqttServer.StopAsync();
            //Console.WriteLine("MQTT Server stopped.");
            return true;

        }


        static MqttServer CreateMqttServer()
        {
            var optionsBuilder = new MqttServerOptionsBuilder()
                .WithDefaultEndpoint() // 监听所有IP，默认端口1883
                .WithDefaultEndpointPort(1883)
                .WithConnectionBacklog(100) // 最大并发连接数
                .WithPersistentSessions () // 订阅拦截器
            ;

            return new MqttServerFactory().CreateMqttServer(optionsBuilder.Build());
        }

        static async Task StartMqttServer(MqttServer mqttServer)
        {
            mqttServer.ClientConnectedAsync += OnClientConnected;
            mqttServer.ClientDisconnectedAsync += OnClientDisconnected;
            mqttServer.ClientSubscribedTopicAsync += OnClientSubscribed;
            mqttServer.ApplicationMessageEnqueuedOrDroppedAsync += MqttServer_ApplicationMessageEnqueuedOrDroppedAsync; 
            await mqttServer.StartAsync();
        }

        private static Task MqttServer_ApplicationMessageEnqueuedOrDroppedAsync(ApplicationMessageEnqueuedEventArgs arg)
        {
          

            Console.WriteLine($"Message received on [{arg.ApplicationMessage.Topic}]: {arg.SenderClientId}, {arg.ReceiverClientId}, {arg.ApplicationMessage.Payload}");
            return Task.CompletedTask;
        }

        static Task OnClientConnected(ClientConnectedEventArgs arg)
        {
            Console.WriteLine($"Client connected: {arg.ClientId}");
            return Task.CompletedTask;
        }

        static Task OnClientDisconnected(ClientDisconnectedEventArgs arg)
        {
            Console.WriteLine($"Client disconnected: {arg.ClientId}");
            return Task.CompletedTask;
        }

        //static void OnNewConnection( context)
        //{
        //    // 示例验证逻辑（可根据需要修改）
        //    if (context.ClientId.Length < 3)
        //    {
        //        context.ReasonCode = MQTTnet.Protocol.MqttConnectReasonCode.ClientIdentifierNotValid;
        //        return;
        //    }

        //    context.ReasonCode = MQTTnet.Protocol.MqttConnectReasonCode.Success;
        //}

        static Task OnClientSubscribed(ClientSubscribedTopicEventArgs context)
        {
            Console.WriteLine($"Client [{context.ClientId}] subscribed to: {context.TopicFilter.Topic}");
            return Task.CompletedTask;
        }


    }
}