/*
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
*/

using log4net.Core;
using System;

namespace log4net.Tests.Appender
{
  /// <summary>
  /// Provides data for the <see cref="EventRaisingAppender.LoggingEventAppended"/> event.
  /// </summary>
  /// <seealso cref="System.EventArgs" />
  public class LoggingEventEventArgs : EventArgs
  {
    public LoggingEvent LoggingEvent { get; private set; }

    public LoggingEventEventArgs(LoggingEvent loggingEvent)
    {
      if (loggingEvent is null)
      {
        throw new ArgumentNullException(nameof(loggingEvent));
      }

      LoggingEvent = loggingEvent;
    }
  }

  /// <summary>
  /// A log4net appender that raises an event each time a logging event is appended
  /// </summary>
  /// <remarks>
  /// This class is intended to provide a way for test code to inspect logging
  /// events as they are generated.
  /// </remarks>
  public class EventRaisingAppender : log4net.Appender.IAppender
  {
    public event EventHandler<LoggingEventEventArgs>? LoggingEventAppended;

    protected void OnLoggingEventAppended(LoggingEventEventArgs e)
    {
      LoggingEventAppended?.Invoke(this, e);
    }

    public void Close()
    {
    }

    public void DoAppend(LoggingEvent loggingEvent)
    {
      OnLoggingEventAppended(new LoggingEventEventArgs(loggingEvent));
    }

    public string Name { get; set; } = string.Empty;
  }
}
