using System;
using System.Net;
using System.Net.Sockets;

namespace Unosquare.Swan {
  /// <summary>
  /// The event arguments for when connections are accepted.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class ConnectionAcceptedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionAcceptedEventArgs" /> class.
    /// </summary>
    /// <param name="client">The client.</param>
    /// <exception cref="ArgumentNullException">client.</exception>
    public ConnectionAcceptedEventArgs(TcpClient client) => this.Client = client ?? throw new ArgumentNullException(nameof(client));

    /// <summary>
    /// Gets the client.
    /// </summary>
    /// <value>
    /// The client.
    /// </value>
    public TcpClient Client {
      get;
    }
  }

  /// <summary>
  /// Occurs before a connection is accepted. Set the Cancel property to true to prevent the connection from being accepted.
  /// </summary>
  /// <seealso cref="Unosquare.Swan.ConnectionAcceptedEventArgs" />
  public class ConnectionAcceptingEventArgs : ConnectionAcceptedEventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionAcceptingEventArgs"/> class.
    /// </summary>
    /// <param name="client">The client.</param>
    public ConnectionAcceptingEventArgs(TcpClient client)
        : base(client) {
    }

    /// <summary>
    /// Setting Cancel to true rejects the new TcpClient.
    /// </summary>
    /// <value>
    ///   <c>true</c> if cancel; otherwise, <c>false</c>.
    /// </value>
    public Boolean Cancel {
      get; set;
    }
  }

  /// <summary>
  /// Event arguments for when a server listener is started.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class ConnectionListenerStartedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionListenerStartedEventArgs" /> class.
    /// </summary>
    /// <param name="listenerEndPoint">The listener end point.</param>
    /// <exception cref="ArgumentNullException">listenerEndPoint.</exception>
    public ConnectionListenerStartedEventArgs(IPEndPoint listenerEndPoint) => this.EndPoint = listenerEndPoint ?? throw new ArgumentNullException(nameof(listenerEndPoint));

    /// <summary>
    /// Gets the end point.
    /// </summary>
    /// <value>
    /// The end point.
    /// </value>
    public IPEndPoint EndPoint {
      get;
    }
  }

  /// <summary>
  /// Event arguments for when a server listener fails to start.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class ConnectionListenerFailedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionListenerFailedEventArgs" /> class.
    /// </summary>
    /// <param name="listenerEndPoint">The listener end point.</param>
    /// <param name="ex">The ex.</param>
    /// <exception cref="ArgumentNullException">
    /// listenerEndPoint
    /// or
    /// ex.
    /// </exception>
    public ConnectionListenerFailedEventArgs(IPEndPoint listenerEndPoint, Exception ex) {
      this.EndPoint = listenerEndPoint ?? throw new ArgumentNullException(nameof(listenerEndPoint));
      this.Error = ex ?? throw new ArgumentNullException(nameof(ex));
    }

    /// <summary>
    /// Gets the end point.
    /// </summary>
    /// <value>
    /// The end point.
    /// </value>
    public IPEndPoint EndPoint {
      get;
    }

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

  /// <summary>
  /// Event arguments for when a server listener stopped.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class ConnectionListenerStoppedEventArgs : EventArgs {
    /// <summary>
    /// Initializes a new instance of the <see cref="ConnectionListenerStoppedEventArgs" /> class.
    /// </summary>
    /// <param name="listenerEndPoint">The listener end point.</param>
    /// <param name="ex">The ex.</param>
    /// <exception cref="ArgumentNullException">
    /// listenerEndPoint
    /// or
    /// ex.
    /// </exception>
    public ConnectionListenerStoppedEventArgs(IPEndPoint listenerEndPoint, Exception ex = null) {
      this.EndPoint = listenerEndPoint ?? throw new ArgumentNullException(nameof(listenerEndPoint));
      this.Error = ex;
    }

    /// <summary>
    /// Gets the end point.
    /// </summary>
    /// <value>
    /// The end point.
    /// </value>
    public IPEndPoint EndPoint {
      get;
    }

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