//
// HttpChannelListener.cs
//
// Author:
//	Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2005 Novell, Inc.  http://www.novell.com
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Net;
using System.Net.Security;
using System.ServiceModel;
using System.ServiceModel.Description;
using System.ServiceModel.Security;
using System.Text;

namespace System.ServiceModel.Channels
{
	internal class HttpSimpleChannelListener<TChannel> : HttpChannelListenerBase<TChannel>
		where TChannel : class, IChannel
	{
		HttpListenerManager<TChannel> httpChannelManager;

		public HttpSimpleChannelListener (HttpTransportBindingElement source,
			BindingContext context)
			: base (source, context)
		{
		}

		public HttpListener Http {
			get {  return httpChannelManager.HttpListener; }
		}

		object creator_lock = new object ();

		protected override TChannel CreateChannel (TimeSpan timeout)
		{
			lock (creator_lock) {
				return CreateChannelCore (timeout);
			}
		}

		TChannel CreateChannelCore (TimeSpan timeout)
		{
			if (typeof (TChannel) == typeof (IReplyChannel))
				return (TChannel) (object) new HttpSimpleReplyChannel ((HttpSimpleChannelListener<IReplyChannel>) (object) this);
			// FIXME: session channel support
			if (typeof (TChannel) == typeof (IReplySessionChannel))
				throw new NotImplementedException ();

			throw new NotSupportedException (String.Format ("Channel type {0} is not supported", typeof (TChannel)));
		}

		protected override void OnOpen (TimeSpan timeout)
		{
			base.OnOpen (timeout);
			StartListening (timeout);
		}

		protected override void OnAbort ()
		{
			httpChannelManager.Stop (true);
		}

		protected override void OnClose (TimeSpan timeout)
		{
			if (State == CommunicationState.Closed)
				return;
			base.OnClose (timeout);
			// FIXME: it is said that channels are not closed
			// when the channel listener is closed.
			// http://blogs.msdn.com/drnick/archive/2006/03/22/557642.aspx
			httpChannelManager.Stop (false);
		}

		void StartListening (TimeSpan timeout)
		{
			httpChannelManager = new HttpListenerManager<TChannel> (this);
			httpChannelManager.Open (timeout);
		}
	}

	internal class AspNetChannelListener<TChannel> : HttpChannelListenerBase<TChannel>
		where TChannel : class, IChannel
	{
		public AspNetChannelListener (HttpTransportBindingElement source,
			BindingContext context)
			: base (source, context)
		{
		}

		SvcHttpHandler http_handler;
		internal SvcHttpHandler HttpHandler {
			get {
				if (http_handler == null)
					http_handler = SvcHttpHandlerFactory.GetHandlerForListener (this);
				return http_handler;
			}
		}

		protected override TChannel CreateChannel (TimeSpan timeout)
		{
			if (typeof (TChannel) == typeof (IReplyChannel))
				return (TChannel) (object) new AspNetReplyChannel ((AspNetChannelListener<IReplyChannel>) (object) this);
			// FIXME: session channel support
			if (typeof (TChannel) == typeof (IReplySessionChannel))
				throw new NotImplementedException ();

			throw new NotSupportedException (String.Format ("Channel type {0} is not supported", typeof (TChannel)));
		}
	}

	internal abstract class HttpChannelListenerBase<TChannel> : InternalChannelListenerBase<TChannel>
		where TChannel : class, IChannel
	{
		HttpTransportBindingElement source;
		BindingContext context;
		List<TChannel> channels = new List<TChannel> ();
		MessageEncoder encoder;

		public HttpChannelListenerBase (HttpTransportBindingElement source,
			BindingContext context)
			: base (context)
		{
			foreach (BindingElement be in context.RemainingBindingElements) {
				MessageEncodingBindingElement mbe = be as MessageEncodingBindingElement;
				if (mbe != null) {
					encoder = CreateEncoder<TChannel> (mbe);
					break;
				}
			}
			if (encoder == null)
				encoder = new TextMessageEncoder (MessageVersion.Default, Encoding.UTF8);
		}

		public MessageEncoder MessageEncoder {
			get { return encoder; }
		}

		protected IList<TChannel> Channels {
			get { return channels; }
		}

		protected override TChannel OnAcceptChannel (TimeSpan timeout)
		{
			TChannel ch = CreateChannel (timeout);
			Channels.Add (ch);
			return ch;
		}

		protected abstract TChannel CreateChannel (TimeSpan timeout);

		protected override bool OnWaitForChannel (TimeSpan timeout)
		{
			throw new NotImplementedException ();
		}

		protected override void OnAbort ()
		{
			OnClose (TimeSpan.Zero);
		}

		protected override void OnOpen (TimeSpan timeout)
		{
		}

		protected override void OnClose (TimeSpan timeout)
		{
			DateTime start = DateTime.Now;
			foreach (TChannel ch in new List<TChannel> (Channels)) // they will be removed during iteration, so create another one
				ch.Close (timeout - (DateTime.Now - start));
			base.OnClose (timeout - (DateTime.Now - start));
		}
	}
}