using System;

using System.Collections.Generic;

using System.IO;

using System.IO.Compression;

using System.Linq;

using System.Net;

using System.Reflection;

using System.Text;

using System.Text.RegularExpressions;

using System.Threading;

using System.Threading.Tasks;

public class HttpServer : IDisposable

{

    private const string NotFoundResponse = "<!doctype html><html><body>Resource not found</body></html>";

    private readonly HttpListener httpListener;

    private readonly CancellationTokenSource cts = new CancellationTokenSource();

    private readonly string prefixPath;

    private Task processingTask;

    public HttpServer(string listenerUriPrefix)

    {

        this.prefixPath = ParsePrefixPath(listenerUriPrefix);

        this.httpListener = new HttpListener();

        this.httpListener.Prefixes.Add(listenerUriPrefix);

    }

    private static string ParsePrefixPath(string listenerUriPrefix)

    {

        var match = Regex.Match(listenerUriPrefix, @"http://(?:[^/]*)(?:\:\d+)?/(.*)");

        if (match.Success)

        {

            return match.Groups[1].Value.ToLowerInvariant();

        }

        else

        {

            return string.Empty;

        }

    }

    public void Start()

    {

        this.httpListener.Start();

        this.processingTask = Task.Factory.StartNew(async () => await ProcessRequests(), TaskCreationOptions.LongRunning);

    }

    private async Task ProcessRequests()

    {

        while (!this.cts.IsCancellationRequested)

        {

            try

            {

                var context = await this.httpListener.GetContextAsync();

                try

                {

                    await ProcessRequest(context).ConfigureAwait(false);

                    context.Response.Close();

                }

                catch (Exception ex)

                {

                    context.Response.StatusCode = 500;

                    context.Response.StatusDescription = "Internal Server Error";

                    context.Response.Close();

                    Console.WriteLine("Error processing HTTP request\n{0}", ex);

                }

            }

            catch (ObjectDisposedException ex)

            {

                if ((ex.ObjectName == this.httpListener.GetType().FullName) && (this.httpListener.IsListening == false))

                {

                    return; // listener is closed/disposed

                }

                Console.WriteLine("Error processing HTTP request\n{0}", ex);

            }

            catch (Exception ex)

            {

                HttpListenerException httpException = ex as HttpListenerException;

                if (httpException == null || httpException.ErrorCode != 995)// IO operation aborted

                {

                    Console.WriteLine("Error processing HTTP request\n{0}", ex);

                }

            }

        }

    }

    private Task ProcessRequest(HttpListenerContext context)

    {

        if (context.Request.HttpMethod.ToUpperInvariant() != "GET")

        {

            return WriteNotFound(context);

        }

        var urlPath = context.Request.RawUrl.Substring(this.prefixPath.Length)

            .ToLowerInvariant();

        switch (urlPath)

        {

            case "/":

                if (!context.Request.Url.ToString().EndsWith("/"))

                {

                    context.Response.Redirect(context.Request.Url + "/");

                    context.Response.Close();

                    return Task.FromResult(0);

                }

                else

                {

                    return WriteString(context, "Hello World!", "text/plain");

                }

            case "/favicon.ico":

                return WriteFavIcon(context);

            case "/ping":

                return WritePong(context);

        }

        return WriteNotFound(context);

    }

    private static Task WritePong(HttpListenerContext context)

    {

        return WriteString(context, "pong", "text/plain");

    }

    private static async Task WriteFavIcon(HttpListenerContext context)

    {

        context.Response.ContentType = "image/png";

        context.Response.StatusCode = 200;

        context.Response.StatusDescription = "OK";

        using (var stream = File.Open("icon.png", FileMode.Open))

        {

            var output = context.Response.OutputStream;

            await stream.CopyToAsync(output);

        }

    }

    private static Task WriteNotFound(HttpListenerContext context)

    {

        return WriteString(context, NotFoundResponse, "text/plain", 404, "NOT FOUND");

    }

    private static async Task WriteString(HttpListenerContext context, string data, string contentType,

        int httpStatus = 200, string httpStatusDescription = "OK")

    {

        AddCORSHeaders(context.Response);

        AddNoCacheHeaders(context.Response);

        context.Response.ContentType = contentType;

        context.Response.StatusCode = httpStatus;

        context.Response.StatusDescription = httpStatusDescription;

        var acceptsGzip = AcceptsGzip(context.Request);

        if (!acceptsGzip)

        {

            using (var writer = new StreamWriter(context.Response.OutputStream, Encoding.UTF8, 4096, true))

            {

                await writer.WriteAsync(data).ConfigureAwait(false);

            }

        }

        else

        {

            context.Response.AddHeader("Content-Encoding", "gzip");

            using (GZipStream gzip = new GZipStream(context.Response.OutputStream, CompressionMode.Compress, true))

            using (var writer = new StreamWriter(gzip, Encoding.UTF8, 4096, true))

            {

                await writer.WriteAsync(data).ConfigureAwait(false);

            }

        }

    }

    private static bool AcceptsGzip(HttpListenerRequest request)

    {

        string encoding = request.Headers["Accept-Encoding"];

        if (string.IsNullOrEmpty(encoding))

        {

            return false;

        }

        return encoding.Contains("gzip");

    }

    private static void AddNoCacheHeaders(HttpListenerResponse response)

    {

        response.Headers.Add("Cache-Control", "no-cache, no-store, must-revalidate");

        response.Headers.Add("Pragma", "no-cache");

        response.Headers.Add("Expires", "0");

    }

    private static void AddCORSHeaders(HttpListenerResponse response)

    {

        response.Headers.Add("Access-Control-Allow-Origin", "*");

        response.Headers.Add("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");

    }

    private void Stop()

    {

        cts.Cancel();

        if (processingTask != null && !processingTask.IsCompleted)

        {

            processingTask.Wait();

        }

        if (this.httpListener.IsListening)

        {

            this.httpListener.Stop();

            this.httpListener.Prefixes.Clear();

        }

    }

    public void Dispose()

    {

        this.Stop();

        this.httpListener.Close();

        using (this.cts) { }

        using (this.httpListener) { }

    }

}

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