using System;
using System.IO;
using System.Threading;
using System.Threading.Tasks;

namespace SocketHttpListener.Net
{
    // Licensed to the .NET Foundation under one or more agreements.
    // See the LICENSE file in the project root for more information.
    //
    // System.Net.ResponseStream
    //
    // Author:
    //  Gonzalo Paniagua Javier (gonzalo@novell.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.
    //

    internal partial class HttpRequestStream : Stream
    {
        public override bool CanSeek => false;
        public override bool CanWrite => false;
        public override bool CanRead => true;

        public override int Read(byte[] buffer, int offset, int size)
        {
            if (buffer == null)
            {
                throw new ArgumentNullException(nameof(buffer));
            }
            if (offset < 0 || offset > buffer.Length)
            {
                throw new ArgumentOutOfRangeException(nameof(offset));
            }
            if (size < 0 || size > buffer.Length - offset)
            {
                throw new ArgumentOutOfRangeException(nameof(size));
            }
            if (size == 0 || _closed)
            {
                return 0;
            }

            return ReadCore(buffer, offset, size);
        }

        public override IAsyncResult BeginRead(byte[] buffer, int offset, int size, AsyncCallback callback, object state)
        {
            if (buffer == null)
            {
                throw new ArgumentNullException(nameof(buffer));
            }
            if (offset < 0 || offset > buffer.Length)
            {
                throw new ArgumentOutOfRangeException(nameof(offset));
            }
            if (size < 0 || size > buffer.Length - offset)
            {
                throw new ArgumentOutOfRangeException(nameof(size));
            }

            return BeginReadCore(buffer, offset, size, callback, state);
        }

        public override void Flush() { }
        public override Task FlushAsync(CancellationToken cancellationToken) => Task.CompletedTask;

        public override long Length => throw new NotImplementedException();

        public override long Position
        {
            get => throw new NotImplementedException();

            set => throw new NotImplementedException();
        }

        public override long Seek(long offset, SeekOrigin origin)
        {
            throw new NotImplementedException();
        }

        public override void SetLength(long value)
        {
            throw new NotImplementedException();
        }

        public override void Write(byte[] buffer, int offset, int count)
        {
            throw new NotImplementedException();
        }

        public override IAsyncResult BeginWrite(byte[] buffer, int offset, int count, AsyncCallback callback, object state)
        {
            return base.BeginWrite(buffer, offset, count, callback, state);
        }

        public override void EndWrite(IAsyncResult asyncResult)
        {
            base.EndWrite(asyncResult);
        }

        internal bool Closed => _closed;

        protected override void Dispose(bool disposing)
        {
            _closed = true;
            base.Dispose(disposing);
        }
    }
}