using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace SocketHttpListener.Net
{
    internal sealed partial class HttpResponseStream : Stream
    {
        private bool _closed;
        internal bool Closed => _closed;

        public override bool CanRead => false;
        public override bool CanSeek => false;
        public override bool CanWrite => true;

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

        public override long Length
        {
            get
            {
                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 int Read(byte[] buffer, int offset, int count)
        {
            throw new NotImplementedException();
        }

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

        public override int EndRead(IAsyncResult asyncResult)
        {
            return base.EndRead(asyncResult);
        }

        public override void Write(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 (_closed)
            {
                return;
            }

            WriteCore(buffer, offset, size);
        }

        public override IAsyncResult BeginWrite(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 BeginWriteCore(buffer, offset, size, callback, state);
        }

        public override void EndWrite(IAsyncResult asyncResult)
        {
            if (asyncResult == null)
            {
                throw new ArgumentNullException(nameof(asyncResult));
            }

            EndWriteCore(asyncResult);
        }

        protected override void Dispose(bool disposing)
        {
            try
            {
                if (disposing)
                {
                    if (_closed)
                    {
                        return;
                    }
                    _closed = true;
                    DisposeCore();
                }
            }
            finally
            {
                base.Dispose(disposing);
            }
        }
    }
}