/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

using System;
using System.IO;
using System.Reflection;
using Thrift.Protocol;

namespace Thrift.Transport
{
    public class TMemoryBuffer : TTransport
    {

        private readonly MemoryStream byteStream;

        public TMemoryBuffer()
        {
            byteStream = new MemoryStream();
        }

        public TMemoryBuffer(byte[] buf)
        {
            byteStream = new MemoryStream(buf);
        }

        public override void Open()
        {
            /** do nothing **/
        }

        public override void Close()
        {
            /** do nothing **/
        }

        public override int Read(byte[] buf, int off, int len)
        {
            return byteStream.Read(buf, off, len);
        }

        public override void Write(byte[] buf, int off, int len)
        {
            byteStream.Write(buf, off, len);
        }

        public byte[] GetBuffer()
        {
            return byteStream.ToArray();
        }


        public override bool IsOpen
        {
            get { return true; }
        }

        public static byte[] Serialize(TAbstractBase s)
        {
            var t = new TMemoryBuffer();
            var p = new TBinaryProtocol(t);

            s.Write(p);

            return t.GetBuffer();
        }

        public static T DeSerialize<T>(byte[] buf) where T : TAbstractBase
        {
            var trans = new TMemoryBuffer(buf);
            var p = new TBinaryProtocol(trans);
            if (typeof(TBase).IsAssignableFrom(typeof(T)))
            {
                var method = typeof(T).GetMethod("Read", BindingFlags.Instance | BindingFlags.Public);
                var t = Activator.CreateInstance<T>();
                method.Invoke(t, new object[] { p });
                return t;
            }
            else
            {
                var method = typeof(T).GetMethod("Read", BindingFlags.Static | BindingFlags.Public);
                return (T)method.Invoke(null, new object[] { p });
            }
        }

        private bool _IsDisposed;

        // IDisposable
        protected override void Dispose(bool disposing)
        {
            if (!_IsDisposed)
            {
                if (disposing)
                {
                    if (byteStream != null)
                        byteStream.Dispose();
                }
            }
            _IsDisposed = true;
        }
    }
}
