using System;
using System.Text;

namespace Unosquare.Swan {
  /// <summary>
  /// The event arguments for connection failure events.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class ConnectionFailureEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionFailureEventArgs"/> class.
    /// </summary>
    /// <param name="ex">The ex.</param>
    public ConnectionFailureEventArgs(Exception ex) => this.Error = ex;

    /// <summary>
    /// Gets the error.
    /// </summary>
    /// <value>
    /// The error.
    /// </value>
    public Exception Error {
      get;
    }
  }

  /// <summary>
  /// Event arguments for when data is received.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class ConnectionDataReceivedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionDataReceivedEventArgs"/> class.
    /// </summary>
    /// <param name="buffer">The buffer.</param>
    /// <param name="trigger">The trigger.</param>
    /// <param name="moreAvailable">if set to <c>true</c> [more available].</param>
    public ConnectionDataReceivedEventArgs(Byte[] buffer, ConnectionDataReceivedTrigger trigger, Boolean moreAvailable) {
      this.Buffer = buffer ?? throw new ArgumentNullException(nameof(buffer));
      this.Trigger = trigger;
      this.HasMoreAvailable = moreAvailable;
    }

    /// <summary>
    /// Gets the buffer.
    /// </summary>
    /// <value>
    /// The buffer.
    /// </value>
    public Byte[] Buffer {
      get;
    }

    /// <summary>
    /// Gets the cause as to why this event was thrown.
    /// </summary>
    /// <value>
    /// The trigger.
    /// </value>
    public ConnectionDataReceivedTrigger Trigger {
      get;
    }

    /// <summary>
    /// Gets a value indicating whether the receive buffer has more bytes available.
    /// </summary>
    /// <value>
    ///   <c>true</c> if this instance has more available; otherwise, <c>false</c>.
    /// </value>
    public Boolean HasMoreAvailable {
      get;
    }

    /// <summary>
    /// Gets the string from the given buffer.
    /// </summary>
    /// <param name="buffer">The buffer.</param>
    /// <param name="encoding">The encoding.</param>
    /// <returns>A <see cref="System.String" /> that contains the results of decoding the specified sequence of bytes.</returns>
    public static String GetStringFromBuffer(Byte[] buffer, Encoding encoding)
        => encoding.GetString(buffer).TrimEnd('\r', '\n');

    /// <summary>
    /// Gets the string from buffer.
    /// </summary>
    /// <param name="encoding">The encoding.</param>
    /// <returns>A <see cref="System.String" /> that contains the results of decoding the specified sequence of bytes.</returns>
    public String GetStringFromBuffer(Encoding encoding)
        => GetStringFromBuffer(this.Buffer, encoding);
  }
}