// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.

using System.Collections.Generic;
using System.Linq;
using BenchmarkDotNet.Attributes;
using MQTTnet.Server;

namespace MQTTnet.Benchmarks;

[MemoryDiagnoser]
public class UnsubscribeBenchmark : BaseBenchmark
{
    const int NumPublishers = 1;
    const int NumTopicsPerPublisher = 10000;

    IMqttClient _mqttClient;
    MqttServer _mqttServer;
    List<string> _topics;

    [GlobalSetup]
    public void Setup()
    {
        TopicGenerator.Generate(NumPublishers, NumTopicsPerPublisher, out var topicsByPublisher, out _, out _);
        _topics = topicsByPublisher.Values.First();

        var serverOptions = new MqttServerOptionsBuilder().WithDefaultEndpoint().Build();

        var serverFactory = new MqttServerFactory();
        _mqttServer = serverFactory.CreateMqttServer(serverOptions);
        var clientFactory = new MqttClientFactory();
        _mqttClient = clientFactory.CreateMqttClient();

        _mqttServer.StartAsync().GetAwaiter().GetResult();

        var clientOptions = new MqttClientOptionsBuilder().WithTcpServer("localhost").Build();

        _mqttClient.ConnectAsync(clientOptions).GetAwaiter().GetResult();

        foreach (var topic in _topics)
        {
            var subscribeOptions = new MqttClientSubscribeOptionsBuilder().WithTopicFilter(topic).Build();
            _mqttClient.SubscribeAsync(subscribeOptions).GetAwaiter().GetResult();
        }
    }

    [Benchmark]
    public void Unsubscribe_10000_Topics()
    {
        foreach (var topic in _topics)
        {
            var unsubscribeOptions = new MqttClientUnsubscribeOptionsBuilder().WithTopicFilter(topic).Build();
            _mqttClient.UnsubscribeAsync(unsubscribeOptions).GetAwaiter().GetResult();
        }
    }
}