using EC.Util.Common;
using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Protocol;
using MQTTnet.Server;
using System.Text;

namespace JiLinApp.Biz.TransmitAlarm;

public class AlarmMqttService : IAlarmService
{
    #region Fields

    private MqttConfig Config { get; }

    private MqttServer Server { get; }

    private IMqttClient Client { get; }

    #endregion Fields

    public AlarmMqttService(MqttConfig config)
    {
        MqttFactory factory = new();
        MqttServerOptions options = new MqttServerOptionsBuilder()
            .WithDefaultEndpoint()
            .WithDefaultEndpointPort(config.Port)
            .Build();
        MqttServer server = factory.CreateMqttServer(options);
        server.ValidatingConnectionAsync += Server_ValidatingConnectionAsync;
        server.ClientConnectedAsync += Server_ClientConnectedAsync;
        server.ClientDisconnectedAsync += Server_ClientDisconnectedAsync;
        server.ClientAcknowledgedPublishPacketAsync += Server_ClientAcknowledgedPublishPacketAsync;
        IMqttClient client = factory.CreateMqttClient();

        Config = config;
        Server = server;
        Client = client;
    }

    ~AlarmMqttService()
    {
        Close();
    }

    #region Base

    public void Start()
    {
        Server.StartAsync().Wait();

        MqttClientOptions mqttClientOptions = new MqttClientOptionsBuilder()
            .WithTcpServer("127.0.0.1", Config.Port)
            .WithClientId(Config.ClientId)
            .WithCredentials(Config.UserName, Config.Password)
            .Build();
        Client.ConnectAsync(mqttClientOptions, CancellationToken.None);
    }

    public void Close()
    {
        Client.DisconnectAsync().Wait();
        Server.StopAsync().Wait();
    }

    public void SendAlarmMessage(AlarmMessage msg)
    {
        MqttApplicationMessage mqttMsg = new MqttApplicationMessageBuilder()
            .WithTopic(Config.TransmitTopic)
            .WithPayload(JsonUtil.ToJson(msg))
            .Build();
        Client.PublishAsync(mqttMsg, CancellationToken.None).Wait();
    }

    #endregion Base

    #region Server Event

    private Task Server_ValidatingConnectionAsync(ValidatingConnectionEventArgs arg)
    {
        if (arg.ClientId.Length == 0) arg.ReasonCode = MqttConnectReasonCode.ClientIdentifierNotValid;
        else if (arg.UserName != Config.UserName) arg.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
        else if (arg.Password != Config.Password) arg.ReasonCode = MqttConnectReasonCode.BadUserNameOrPassword;
        return Task.CompletedTask;
    }

    private Task Server_ClientConnectedAsync(ClientConnectedEventArgs arg)
    {
        return Task.CompletedTask;
    }

    private Task Server_ClientDisconnectedAsync(ClientDisconnectedEventArgs arg)
    {
        return Task.CompletedTask;
    }

    private Task Server_ClientAcknowledgedPublishPacketAsync(ClientAcknowledgedPublishPacketEventArgs arg)
    {
        string clientId = arg.ClientId;
        ushort packetIdentifier = arg.PublishPacket.PacketIdentifier;
        string topic = arg.PublishPacket.Topic;
        string msg = Encoding.UTF8.GetString(arg.PublishPacket.Payload);
        return Task.CompletedTask;
    }

    #endregion Server Event

    #region

    #endregion
}