using System;
using System.Collections.Generic;
using ln.logging;
using ln.http.exceptions;
using System.IO;
using System.Text;
using System.Threading;

namespace ln.http
{
    
    /*
    public class HttpServer
    {
        public static bool DefaultRouteAuthentication { get; set; } = false;

        private HashSet<HttpRouterDelegate> _routerDelegates = new HashSet<HttpRouterDelegate>();
        public IEnumerable<HttpRouterDelegate> Routers => _routerDelegates;

        public TextWriter AccessLogWriter { get; set; }
        private ILogWriter _logWriter;


        private HashSet<IHttpAuthenticationSource> _authenticationSources = new HashSet<IHttpAuthenticationSource>();
        public IEnumerable<IHttpAuthenticationSource> AuthenticationSources => _authenticationSources;


        public HttpServer() : this(Console.Out, new LogWriter(new ConsoleLogSink()))
        {
        }
        
        public HttpServer(TextWriter accessLogWriter, ILogWriter logWriter)
        {
            AccessLogWriter = accessLogWriter;
            _logWriter = logWriter;
        }
        public HttpServer(HttpRouterDelegate router)
            : this()
        {
            AddRouter(router);
        }

        public void RegisterAuthenticationSource(IHttpAuthenticationSource authenticationSource) =>
            _authenticationSources.Add(authenticationSource);
        public void UnregisterAuthenticationSource(IHttpAuthenticationSource authenticationSource) =>
            _authenticationSources.Remove(authenticationSource);

        public void AddRouter(HttpRouter httpRouter) => AddRouter(httpRouter.RouteRequest);
        public void AddRouter(HttpRouterDelegate routerDelegate) => _routerDelegates.Add(routerDelegate);

        public void RemoveRouter(HttpRouter httpRouter) => RemoveRouter(httpRouter.RouteRequest);
        public void RemoveRouter(HttpRouterDelegate routerDelegate) => _routerDelegates.Remove(routerDelegate);

        public void Connection(HttpConnection httpConnection) =>
            ThreadPool.QueueUserWorkItem((state => ConnectionWorker(httpConnection)));
        
        public void ConnectionWorker(HttpConnection httpConnection)
        {
            try
            {
                bool keepalive = false;
                do
                {
                    DateTime start = DateTime.Now;
                    
                    using (HttpRequest httpRequest = ReadRequest(httpConnection))
                    {
                        if (httpRequest == null)
                            break;

                        HttpContext httpContext = new HttpContext(this, httpRequest);

                        try
                        {
                            if (!RouteRequest(httpContext))
                                throw new HttpException(HttpStatusCode.NotFound);
                        }
                        catch (Exception exception)
                        {
                            _logWriter?.Log(exception);
                            
                            if (exception is HttpException httpException)
                            {
                                try
                                {
                                    HttpContext errorContext = new HttpContext(httpContext, httpException);
                                    if (!RouteRequest(errorContext))
                                    {
                                        errorContext.ResetRoutingStack(String.Format("/_err.html",
                                            (int)httpException.HttpStatusCode));
                                        RouteRequest(errorContext);
                                    }
                                    httpContext.Response = errorContext.Response;
                                }
                                finally
                                {
                                    if (httpContext.Response is null)
                                        httpContext.Response = HttpResponse
                                            .InternalServerError()
                                            .Content(
                                                String.Format("An internal error occured ({0})", exception.ToString()));
                                }
                            }
                            else
                            {
                                httpContext.Response = HttpResponse.InternalServerError()
                                    .Content(String.Format("An internal error occured ({0})", exception.ToString()));
                            }
                        }

                        try
                        {
                            httpContext.Response.WriteTo(httpConnection.ClientStream);
                            httpContext.Response?.ContentStream?.Dispose();
                        }
                        catch (IOException ioexception)
                        {
                            break;
                        }

                        DateTime end = DateTime.Now;
                        TimeSpan duration = end - start;

                        AccessLogWriter?.WriteLine("{0} {1} {2} {3} {4} {5} {6} {7}",
                            start,
                            end,
                            duration,
                            httpConnection.RemoteEndPoint?.ToString(),
                            httpContext.Response?.StatusCode.ToString() ?? "-",
                            httpContext.AuthenticatedPrincipal?.ToString() ?? "-",
                            httpContext.Request.Method,
                            httpContext.Request.RequestUri
                        );
                        AccessLogWriter?.Flush();

                        keepalive = httpContext.Response.GetHeader("connection", "keep-alive").Equals("keep-alive") &&
                                    httpRequest
                                        .GetRequestHeader("connection",
                                            httpRequest.Protocol.Equals("HTTP/1.1") ? "keep-alive" : "close").Contains(
                                            "keep-alive",
                                            StringComparison.InvariantCultureIgnoreCase);
                    }
                } while (keepalive);
            }
            finally
            {
                httpConnection.ClientStream.Close();
                httpConnection.ClientStream.Dispose();
            }
        }

        private bool RouteRequest(HttpContext httpContext)
        {
            foreach (var routerDelegate in _routerDelegates)
            {
                if (routerDelegate(httpContext))
                    return true;
            }

            return false;
        }
        
        private HttpRequest ReadRequest(HttpConnection httpConnection)
        {
            try
            {
                if (HttpLikeProtocolReader.ReadRequest(httpConnection.ClientStream, Encoding.UTF8, out Request request))
                    return new HttpRequest(this, request);
                return null;
            } catch (IOException)
            {
                return null;
            } catch (ConnectionClosedException)
            {
                return null;
            } catch (Exception e)
            {
                _logWriter?.Log(e);
                return null;
            }
        }
    }
*/
}