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

namespace Raytheon.Instruments
{
   /// <summary>
   /// An interface to any device that you can write and read to/from
   /// </summary>
   public interface ICommAsync : IInstrument
   {
      /// <summary>
      /// Close the communication interface
      /// </summary>
      void Close( );

      /// <summary>
      /// Open the communication interface
      /// </summary>
      void Open( );

      /// <summary>
      /// Set the timeout on a read
      /// </summary>
      /// <param name="timeout"></param>
      void SetReadTimeout( uint timeout );

      /// <summary>
      /// Reads data from a communication device
      /// </summary>
      /// <param name="dataRead"></param>
      /// <param name="token"></param>
      /// <returns>number of bytes read</returns>
      Task<uint> ReadAsync(byte[] dataRead, CancellationToken token = default(CancellationToken));

      /// <summary>
      /// Reads data from a communication device
      /// </summary>
      /// <param name="token"></param>
      /// <returns></returns>
      Task<string> ReadAsync(CancellationToken token = default(CancellationToken));

      /// <summary>
      /// Writes data to a communication device
      /// </summary>
      /// <param name="data"></param>
      /// <param name="numBytesToWrite"></param>
      /// <returns>the number of bytes written</returns>
      Task<uint> WriteAsync(byte[] dataToSend, uint numBytesToWrite, CancellationToken token = default(CancellationToken));

      /// <summary>
      /// Writes data to a communication device
      /// </summary>
      /// <param name="message"></param>
      /// <returns></returns>
      Task WriteAsync(string message, CancellationToken token = default(CancellationToken));

      /// <summary>
      /// Send command and get response
      /// </summary>
      Task<string> SendCommandGetResponseAsync(string message, CancellationToken token = default(CancellationToken), int timeoutInMs = 5000);

      /// <summary>
      /// Send command and get response
      /// </summary>
      Task<byte[]> SendCommandGetResponseAsync(byte[] data, CancellationToken token = default(CancellationToken), int timeoutInMs = 5000);

      /// <summary>
      /// Keep reading asynchronously
      /// </summary>
      /// <param name="cancellationToken"></param>
      /// <param name="dataReceived"></param>
      /// <returns></returns>
      Task KeepReadingAsync( CancellationToken cancellationToken, Action<string> dataReceived );

      /// <summary>
      /// Keep reading asynchronously
      /// </summary>
      Task KeepReadingAsync(CancellationToken cancellationToken, Action<byte[]> dataReceived);
   }
}