var client = new SocketIO("http://localhost:11000/");

client.On("hi", response =>
{
    // You can print the returned data first to decide what to do next.
    // output: ["hi client"]
    Console.WriteLine(response);

    string text = response.GetValue<string>();

    // The socket.io server code looks like this:
    // socket.emit('hi', 'hi client');
});

client.On("test", response =>
{
    // You can print the returned data first to decide what to do next.
    // output: ["ok",{"id":1,"name":"tom"}]
    Console.WriteLine(response);
    
    // Get the first data in the response
    string text = response.GetValue<string>();
    // Get the second data in the response
    var dto = response.GetValue<TestDTO>(1);

    // The socket.io server code looks like this:
    // socket.emit('hi', 'ok', { id: 1, name: 'tom'});
});

client.OnConnected += async (sender, e) =>
{
    // Emit a string
    await client.EmitAsync("hi", "socket.io");

    // Emit a string and an object
    var dto = new TestDTO { Id = 123, Name = "bob" };
    await client.EmitAsync("register", "source", dto);
};
await client.ConnectAsync();

var client = new SocketIO("http://localhost:11000/", new SocketIOOptions
{
    Query = new List<KeyValuePair<string, string>>
    {
        new KeyValuePair<string, string>("token", "abc123"),
        new KeyValuePair<string, string>("key", "value")
    }
});

await client.EmitAsync("ack", response =>
{
    // You can print the returned data first to decide what to do next.
    // output: [{"result":true,"message":"Prometheus - server"}]
    Console.WriteLine(response);
    var result = response.GetValue<BaseResult>();
}, "Prometheus");

socket.on("ack", (name, fn) => {
    fn({
        result: true,
        message: `${name} - server`
    });
});

client.On("ack2", async response =>
{
    // You can print the returned data first to decide what to do next.
    // output: [1, 2]
    Console.WriteLine(response);
    int a = response.GetValue<int>();
    int b = response.GetValue<int>(1);
    
    await response.CallbackAsync(b, a);
});

socket.emit("ack2", 1, 2, (arg1, arg2) => {
    console.log(`arg1: ${arg1}, arg2: ${arg2}`);
});

arg1: 2, arg2: 1

class FileDTO
{
    [JsonPropertyName("name")]
    public string Name { get; set; }

    [JsonPropertyName("mimeType")]
    public string MimeType { get; set; }

    [JsonPropertyName("bytes")]
    public byte[] Bytes { get; set; }
}

client.OnConnected += async (sender, e) =>
{
    await client.EmitAsync("upload", new FileDTO
    {
        Name = "template.html"
        MimeType = "text/html",
        bytes = Encoding.UTF8.GetBytes("<div>test</div>")
    });
};

client.On("new files", response =>
{
    // You can print the returned data first to decide what to do next.
    // output: [{"name":"template.html","mimeType":"text/html","bytes":{"_placeholder":true,"num":0}}]
    Console.WriteLine(response);
    var result = response.GetValue<FileDTO>();
    Console.WriteLine(Encoding.UTF8.GetString(result.Bytes))
});

var client = new SocketIO("http://localhost:11000/");
var jsonSerializer = client.JsonSerializer as SystemTextJsonSerializer;
jsonSerializer.OptionsProvider = () => new JsonSerializerOptions
{
    PropertyNameCaseInsensitive = true
};

var jsonSerializer = new NewtonsoftJsonSerializer();
jsonSerializer.OptionsProvider = () => new JsonSerializerSettings
{
    ContractResolver = new DefaultContractResolver
    {
        NamingStrategy = new CamelCaseNamingStrategy()
    }
};
client.JsonSerializer = jsonSerializer;

var client = new SocketIO("http://localhost:11000/");
client.ClientWebSocketProvider = () =>
{
    var clientWebSocket = new DefaultClientWebSocket
    {
        ConfigOptions = o =>
        {
            var options = o as ClientWebSocketOptions;

            var proxy = new WebProxy("http://example.com");
            proxy.Credentials = new NetworkCredential("username", "password");
            options.Proxy = proxy;

            options.SetRequestHeader("key", "value");

            options.RemoteCertificateValidationCallback = (sender, certificate, chain, sslPolicyErrors) =>
            {
                Console.WriteLine("SslPolicyErrors: " + sslPolicyErrors);
                if (sslPolicyErrors == System.Net.Security.SslPolicyErrors.None)
                {
                    return true;
                }
                return true;
            };
        }
    };
    return clientWebSocket;
};

client.ClientWebSocketProvider = () => new ClientWebSocketManaged();

    public partial class MainPage: ContentPage
    {
        public MainPage()
        {
            InitializeComponent();
        }

        public SocketIO Socket {get;}
    }

    ...

    public class MainActivity: global::Xamarin.Forms.Platform.Android.FormsAppCompatActivity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            ...
            var app = new App();
            var mainPage = app.MainPage as MainPage;
            mainPage.Socket.AddExpectedException(typeof(Java.Net.SocketException));
            mainPage.Socket.AddExpectedException(typeof(Java.Net.SocketTimeoutException));
            LoadApplication(app);
        }

        ...
    }