// Copyright (c) Cloud Native Foundation. 
// Licensed under the Apache 2.0 license.
// See LICENSE file in the project root for full license information.

namespace CloudNative.CloudEvents.UnitTests
{
    using System;
    using System.Collections.Concurrent;
    using System.IO;
    using System.Net;
    using System.Net.Http;
    using System.Net.Mime;
    using System.Threading.Tasks;
    using Xunit;
    using CloudNative.CloudEvents;
    using CloudNative.CloudEvents.Mqtt;
    using MQTTnet;
    using MQTTnet.Client;
    using MQTTnet.Server;

    public class MqttTest : IDisposable
    {
        IMqttServer mqttServer;

        public MqttTest()
        {
            var optionsBuilder = new MqttServerOptionsBuilder()
                .WithConnectionBacklog(100)
                .WithDefaultEndpointPort(52355);

            this.mqttServer = new MqttFactory().CreateMqttServer();
            mqttServer.StartAsync(optionsBuilder.Build()).GetAwaiter().GetResult();
        }

        public void Dispose()
        {
            mqttServer.StopAsync().GetAwaiter().GetResult();
        }

        [Fact]
        public async Task MqttSendTest()
        {

            var jsonEventFormatter = new JsonEventFormatter();
            var cloudEvent = new CloudEvent("com.github.pull.create",
                new Uri("https://github.com/cloudevents/spec/pull/123"))
            {
                Id = "A234-1234-1234",
                Time = new DateTime(2018, 4, 5, 17, 31, 0, DateTimeKind.Utc),
                DataContentType = new ContentType(MediaTypeNames.Text.Xml),
                Data = "<much wow=\"xml\"/>"
            };

            var attrs = cloudEvent.GetAttributes();
            attrs["comexampleextension1"] = "value";
            attrs["comexampleextension2"] = new { othervalue = 5 };

             var client = new MqttFactory().CreateMqttClient();

            var options = new MqttClientOptionsBuilder()
                .WithClientId("Client1")
                .WithTcpServer("localhost", 52355)
                .WithCleanSession()
                .Build();

            TaskCompletionSource<CloudEvent> tcs = new TaskCompletionSource<CloudEvent>();
            await client.ConnectAsync(options);
            client.ApplicationMessageReceived += (sender, args) =>
                {
                    tcs.SetResult(args.ApplicationMessage.ToCloudEvent(jsonEventFormatter));
                };

            var result = await client.SubscribeAsync("abc");
            await client.PublishAsync(new MqttCloudEventMessage(cloudEvent, new JsonEventFormatter()) { Topic = "abc" });
            var receivedCloudEvent = await tcs.Task;

            Assert.Equal(CloudEventsSpecVersion.Default, receivedCloudEvent.SpecVersion);
            Assert.Equal("com.github.pull.create", receivedCloudEvent.Type);
            Assert.Equal(new Uri("https://github.com/cloudevents/spec/pull/123"), receivedCloudEvent.Source);
            Assert.Equal("A234-1234-1234", receivedCloudEvent.Id);
            Assert.Equal(DateTime.Parse("2018-04-05T17:31:00Z").ToUniversalTime(),
                receivedCloudEvent.Time.Value.ToUniversalTime());
            Assert.Equal(new ContentType(MediaTypeNames.Text.Xml), receivedCloudEvent.DataContentType);
            Assert.Equal("<much wow=\"xml\"/>", receivedCloudEvent.Data);

            var attr = receivedCloudEvent.GetAttributes();
            Assert.Equal("value", (string)attr["comexampleextension1"]);
            Assert.Equal(5, (int)((dynamic)attr["comexampleextension2"]).othervalue);
            




        }

    }
}