//
// WebHttpBehavior.cs
//
// Author:
//	Atsushi Enomoto  <atsushi@ximian.com>
//
// Copyright (C) 2008 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.ServiceModel;
using System.ServiceModel.Channels;
using System.ServiceModel.Dispatcher;
using System.ServiceModel.Web;

namespace System.ServiceModel.Description
{

	internal static class WebHttpBehaviorExtensions
	{
		public static WebAttributeInfo GetWebAttributeInfo (this OperationDescription od)
		{
#if NET_2_1
			var mi = od.BeginMethod ?? od.SyncMethod;
			var atts = mi.GetCustomAttributes (typeof (WebGetAttribute), true);
			if (atts.Length == 1)
				return ((WebGetAttribute) atts [0]).Info;
			atts = mi.GetCustomAttributes (typeof (WebInvokeAttribute), true);
			if (atts.Length == 1)
				return ((WebInvokeAttribute) atts [0]).Info;
			return null;
#else
			foreach (IOperationBehavior ob in od.Behaviors) {
				WebAttributeInfo info = null;
				var wg = ob as WebGetAttribute;
				if (wg != null)
					return wg.Info;
				var wi = ob as WebInvokeAttribute;
				if (wi != null)
					return wi.Info;
			}
			return new WebGetAttribute ().Info; // blank one
#endif
		}
	}

	public class WebHttpBehavior
#if !NET_2_1
	 : IEndpointBehavior
#endif
	{
		public WebHttpBehavior ()
		{
			DefaultBodyStyle = WebMessageBodyStyle.Bare;
			DefaultOutgoingRequestFormat = WebMessageFormat.Xml;
			DefaultOutgoingResponseFormat = WebMessageFormat.Xml;
		}

		public virtual WebMessageBodyStyle DefaultBodyStyle { get; set; }

		public virtual WebMessageFormat DefaultOutgoingRequestFormat { get; set; }

		public virtual WebMessageFormat DefaultOutgoingResponseFormat { get; set; }

		public virtual void AddBindingParameters (ServiceEndpoint endpoint, BindingParameterCollection bindingParameters)
		{
			// nothing
		}

		[MonoTODO]
		protected virtual void AddClientErrorInspector (ServiceEndpoint endpoint, ClientRuntime clientRuntime)
		{
			// clientRuntime.MessageInspectors.Add (something);
		}

#if !NET_2_1
		[MonoTODO]
		protected virtual void AddServerErrorHandlers (ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
		{
			// endpointDispatcher.ChannelDispatcher.ErrorHandlers.Add (something);
		}
#endif

		public virtual void ApplyClientBehavior (ServiceEndpoint endpoint, ClientRuntime clientRuntime)
		{
			AddClientErrorInspector (endpoint, clientRuntime);
#if MOONLIGHT
			throw new NotSupportedException ("Due to the lack of ClientRuntime.Operations, Silverlight cannot support this binding.");
#else
			foreach (ClientOperation oper in clientRuntime.Operations) {
				var req = GetRequestClientFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
				var res = GetReplyClientFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
				oper.Formatter = new ClientPairFormatter (req, res);
			}
#endif
		}

#if !NET_2_1
		public virtual void ApplyDispatchBehavior (ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher)
		{
			endpointDispatcher.DispatchRuntime.OperationSelector = GetOperationSelector (endpoint);
			// FIXME: get HostNameComparisonMode from WebHttpBinding by some means.
			endpointDispatcher.FilterPriority = 1; // It is to take higher priority than that of ServiceMetadataExtension (whose URL likely conflicts with this one).
			endpointDispatcher.AddressFilter = new PrefixEndpointAddressMessageFilter (endpoint.Address);
			endpointDispatcher.ContractFilter = new MatchAllMessageFilter ();
			AddServerErrorHandlers (endpoint, endpointDispatcher);

			foreach (DispatchOperation oper in endpointDispatcher.DispatchRuntime.Operations) {
				var req = GetRequestDispatchFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
				var res = GetReplyDispatchFormatter (endpoint.Contract.Operations.Find (oper.Name), endpoint);
				oper.Formatter = new DispatchPairFormatter (req, res);
			}
		}
#endif

		internal class ClientPairFormatter : IClientMessageFormatter
		{
			public ClientPairFormatter (IClientMessageFormatter request, IClientMessageFormatter reply)
			{
				this.request = request;
				this.reply = reply;
			}

			IClientMessageFormatter request, reply;

			public Message SerializeRequest (MessageVersion messageVersion, object [] parameters)
			{
				return request.SerializeRequest (messageVersion, parameters);
			}

			public object DeserializeReply (Message message, object [] parameters)
			{
				return reply.DeserializeReply (message, parameters);
			}
		}

#if !NET_2_1
		internal class DispatchPairFormatter : IDispatchMessageFormatter
		{
			public DispatchPairFormatter (IDispatchMessageFormatter request, IDispatchMessageFormatter reply)
			{
				this.request = request;
				this.reply = reply;
			}

			IDispatchMessageFormatter request;
			IDispatchMessageFormatter reply;

			public void DeserializeRequest (Message message, object [] parameters)
			{
				request.DeserializeRequest (message, parameters);
			}

			public Message SerializeReply (MessageVersion messageVersion, object [] parameters, object result)
			{
				return reply.SerializeReply (messageVersion, parameters, result);
			}
		}

		protected virtual WebHttpDispatchOperationSelector GetOperationSelector (ServiceEndpoint endpoint)
		{
			return new WebHttpDispatchOperationSelector (endpoint);
		}
#endif

		protected virtual QueryStringConverter GetQueryStringConverter (OperationDescription operationDescription)
		{
			return new QueryStringConverter ();
		}

		protected virtual IClientMessageFormatter GetReplyClientFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
		{
			return new WebMessageFormatter.ReplyClientFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
		}

#if !NET_2_1
		protected virtual IDispatchMessageFormatter GetReplyDispatchFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
		{
			return new WebMessageFormatter.ReplyDispatchFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
		}
#endif

		protected virtual IClientMessageFormatter GetRequestClientFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
		{
			return new WebMessageFormatter.RequestClientFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
		}

#if !NET_2_1
		protected virtual IDispatchMessageFormatter GetRequestDispatchFormatter (OperationDescription operationDescription, ServiceEndpoint endpoint)
		{
			return new WebMessageFormatter.RequestDispatchFormatter (operationDescription, endpoint, GetQueryStringConverter (operationDescription), this);
		}
#endif

		[MonoTODO ("check UriTemplate validity")]
		public virtual void Validate (ServiceEndpoint endpoint)
		{
			if (endpoint == null)
				throw new ArgumentNullException ("endpoint");

			foreach (var oper in endpoint.Contract.Operations) {
				var wai = oper.GetWebAttributeInfo ();
				if (wai.Method == "GET")
					continue;
				var style = wai != null && wai.IsBodyStyleSetExplicitly ? wai.BodyStyle : DefaultBodyStyle;
				foreach (var msg in oper.Messages)
					switch (style) {
					case WebMessageBodyStyle.Wrapped:
						continue;
					case WebMessageBodyStyle.WrappedRequest:
						if (msg.Direction == MessageDirection.Output)
							continue;
						goto case WebMessageBodyStyle.Bare;
					case WebMessageBodyStyle.WrappedResponse:
						if (msg.Direction == MessageDirection.Input)
							continue;
						goto case WebMessageBodyStyle.Bare;
					case WebMessageBodyStyle.Bare:
					default:
						if (msg.Body.Parts.Count > 1)
							throw new InvalidOperationException (String.Format ("{0} message on operation '{1}' has multiple parameters which is not allowed when the operation indicates no wrapper element. BodyStyle must be 'wrapped' on the operation WebInvoke/WebGet attribute.", msg.Direction, oper.Name));
						break;
					}
			}

			ValidateBinding (endpoint);
		}

		protected virtual void ValidateBinding (ServiceEndpoint endpoint)
		{
			switch (endpoint.Binding.Scheme) {
			case "http":
			case "https":
				break;
			default:
				throw new InvalidOperationException ("Only http and https are allowed for WebHttpBehavior");
			}
			if (!endpoint.Binding.MessageVersion.Equals (MessageVersion.None))
				throw new InvalidOperationException ("Only MessageVersion.None is allowed for WebHttpBehavior");
			if (!endpoint.Binding.CreateBindingElements ().Find<TransportBindingElement> ().ManualAddressing)
				throw new InvalidOperationException ("ManualAddressing in the transport binding element in the binding must be true for WebHttpBehavior");
		}
	}
}