// <copyright>
// Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>

namespace System.ServiceModel.Channels
{
    using System;
    using System.IO;
    using System.Net;
    using System.Net.Http;
    using System.Runtime;
    using System.Threading.Tasks;

    class OpaqueContent : HttpContent
    {
        MessageEncoder messageEncoder;
        Message message;
        string mtomBoundary;

        public OpaqueContent(MessageEncoder encoder, Message message, string mtomBoundary)
        {
            Fx.Assert(encoder != null, "encoder should not be null.");
            Fx.Assert(message != null, "message should not be null.");

            this.messageEncoder = encoder;
            this.message = message;
            this.mtomBoundary = mtomBoundary;
        }

        public bool IsEmpty
        {
            get 
            {
                return this.message.IsEmpty;
            }
        }

        public void WriteToStream(Stream stream)
        {
            Fx.Assert(stream != null, "stream should not be null.");
            MtomMessageEncoder mtomMessageEncoder = this.messageEncoder as MtomMessageEncoder;
            if (mtomMessageEncoder == null)
            {
                this.messageEncoder.WriteMessage(this.message, stream);
            }
            else
            {
                mtomMessageEncoder.WriteMessage(this.message, stream, this.mtomBoundary);
            }
        }

        public IAsyncResult BeginWriteToStream(Stream stream, AsyncCallback callback, object state)
        {
            Fx.Assert(stream != null, "stream should not be null.");
            MtomMessageEncoder mtomMessageEncoder = this.messageEncoder as MtomMessageEncoder;
            if (mtomMessageEncoder == null)
            {
                return this.messageEncoder.BeginWriteMessage(this.message, stream, callback, state);
            }
            else
            {
                return mtomMessageEncoder.BeginWriteMessage(this.message, stream, this.mtomBoundary, callback, state);
            }
        }

        public void EndWriteToStream(IAsyncResult result)
        {
            this.messageEncoder.EndWriteMessage(result);
        }

        protected override Task SerializeToStreamAsync(Stream stream, TransportContext context)
        {
            throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new NotSupportedException(
                SR.GetString(SR.WebSocketOpaqueStreamContentNotSupportError)));
        }

        protected override bool TryComputeLength(out long length)
        {
            length = 0;
            return false;
        }
    }
}