#region License
/*
 * CloseEventArgs.cs
 *
 * The MIT License
 *
 * Copyright (c) 2012-2014 sta.blockhead
 *
 * 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.
 */
#endregion

using System;
using System.Text;

namespace WebSocketSharp
{
  /// <summary>
  /// Contains the event data associated with a <see cref="WebSocket.OnClose"/>
  /// event.
  /// </summary>
  /// <remarks>
  /// A <see cref="WebSocket.OnClose"/> event occurs when the WebSocket connection
  /// has been closed. If you want to get the reason for closure, you access the
  /// <see cref="Code"/> or <see cref="Reason"/> property.
  /// </remarks>
  public class CloseEventArgs : EventArgs
  {
    #region Private Fields

    private bool   _clean;
    private ushort _code;
    private string _reason;

    #endregion

    #region Internal Constructors

    internal CloseEventArgs (PayloadData payload)
    {
      var data = payload.ApplicationData;
      _code = getCodeFrom (data);
      _reason = getReasonFrom (data);
      _clean = false;
    }

    #endregion

    #region Public Properties

    /// <summary>
    /// Gets the status code for closure.
    /// </summary>
    /// <value>
    /// A <see cref="ushort"/> that indicates the status code for closure if any.
    /// </value>
    public ushort Code {
      get {
        return _code;
      }
    }

    /// <summary>
    /// Gets the reason for closure.
    /// </summary>
    /// <value>
    /// A <see cref="string"/> that represents the reason for closure if any.
    /// </value>
    public string Reason {
      get {
        return _reason;
      }
    }

    /// <summary>
    /// Gets a value indicating whether the WebSocket connection has been closed
    /// cleanly.
    /// </summary>
    /// <value>
    /// <c>true</c> if the WebSocket connection has been closed cleanly;
    /// otherwise, <c>false</c>.
    /// </value>
    public bool WasClean {
      get {
        return _clean;
      }

      internal set {
        _clean = value;
      }
    }

    #endregion

    #region Private Methods

    private static ushort getCodeFrom (byte [] data)
    {
      return data.Length > 1
             ? data.SubArray (0, 2).ToUInt16 (ByteOrder.BIG)
             : (ushort) CloseStatusCode.NO_STATUS_CODE;
    }

    private static string getReasonFrom (byte [] data)
    {
      var len = data.Length;
      return len > 2
             ? Encoding.UTF8.GetString (data.SubArray (2, len - 2))
             : String.Empty;
    }

    #endregion
  }
}