#region Copyright & License
//
// Copyright 2001-2005 The Apache Software Foundation
//
// Licensed 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.
//
#endregion

// .NET Compact Framework 1.0 has no support for System.Web.Mail
// SSCLI 1.0 has no support for System.Web.Mail
#if !NETCF && !SSCLI

using System;
using System.IO;

#if NET_2_0
using System.Net.Mail;
#else
using System.Web.Mail;
#endif

using log4net.Layout;
using log4net.Core;
using log4net.Util;

namespace log4net.Appender
{
	/// <summary>
	/// Send an e-mail when a specific logging event occurs, typically on errors 
	/// or fatal errors.
	/// </summary>
	/// <remarks>
	/// <para>
	/// The number of logging events delivered in this e-mail depend on
	/// the value of <see cref="BufferingAppenderSkeleton.BufferSize"/> option. The
	/// <see cref="SmtpAppender"/> keeps only the last
	/// <see cref="BufferingAppenderSkeleton.BufferSize"/> logging events in its 
	/// cyclic buffer. This keeps memory requirements at a reasonable level while 
	/// still delivering useful application context.
	/// </para>
	/// <note type="caution">
	/// Authentication and setting the server Port are only available on the MS .NET 1.1 runtime.
	/// For these features to be enabled you need to ensure that you are using a version of
	/// the log4net assembly that is built against the MS .NET 1.1 framework and that you are
	/// running the your application on the MS .NET 1.1 runtime. On all other platforms only sending
	/// unauthenticated messages to a server listening on port 25 (the default) is supported.
	/// </note>
	/// <para>
	/// Authentication is supported by setting the <see cref="Authentication"/> property to
	/// either <see cref="SmtpAuthentication.Basic"/> or <see cref="SmtpAuthentication.Ntlm"/>.
	/// If using <see cref="SmtpAuthentication.Basic"/> authentication then the <see cref="Username"/>
	/// and <see cref="Password"/> properties must also be set.
	/// </para>
	/// <para>
	/// To set the SMTP server port use the <see cref="Port"/> property. The default port is 25.
	/// </para>
	/// </remarks>
	/// <author>Nicko Cadell</author>
	/// <author>Gert Driesen</author>
	public class SmtpAppender : BufferingAppenderSkeleton
	{
		#region Public Instance Constructors

		/// <summary>
		/// Default constructor
		/// </summary>
		/// <remarks>
		/// <para>
		/// Default constructor
		/// </para>
		/// </remarks>
		public SmtpAppender()
		{	
		}

		#endregion // Public Instance Constructors

		#region Public Instance Properties

		/// <summary>
		/// Gets or sets a semicolon-delimited list of recipient e-mail addresses.
		/// </summary>
		/// <value>
		/// A semicolon-delimited list of e-mail addresses.
		/// </value>
		/// <remarks>
		/// <para>
		/// A semicolon-delimited list of recipient e-mail addresses.
		/// </para>
		/// </remarks>
		public string To 
		{
			get { return m_to; }
			set { m_to = value; }
		}

		/// <summary>
		/// Gets or sets the e-mail address of the sender.
		/// </summary>
		/// <value>
		/// The e-mail address of the sender.
		/// </value>
		/// <remarks>
		/// <para>
		/// The e-mail address of the sender.
		/// </para>
		/// </remarks>
		public string From 
		{
			get { return m_from; }
			set { m_from = value; }
		}

		/// <summary>
		/// Gets or sets the subject line of the e-mail message.
		/// </summary>
		/// <value>
		/// The subject line of the e-mail message.
		/// </value>
		/// <remarks>
		/// <para>
		/// The subject line of the e-mail message.
		/// </para>
		/// </remarks>
		public string Subject 
		{
			get { return m_subject; }
			set { m_subject = value; }
		}
  
		/// <summary>
		/// Gets or sets the name of the SMTP relay mail server to use to send 
		/// the e-mail messages.
		/// </summary>
		/// <value>
		/// The name of the e-mail relay server. If SmtpServer is not set, the 
		/// name of the local SMTP server is used.
		/// </value>
		/// <remarks>
		/// <para>
		/// The name of the e-mail relay server. If SmtpServer is not set, the 
		/// name of the local SMTP server is used.
		/// </para>
		/// </remarks>
		public string SmtpHost
		{
			get { return m_smtpHost; }
			set { m_smtpHost = value; }
		}

		/// <summary>
		/// Obsolete
		/// </summary>
		/// <remarks>
		/// Use the BufferingAppenderSkeleton Fix methods instead 
		/// </remarks>
		/// <remarks>
		/// <para>
		/// Obsolete property.
		/// </para>
		/// </remarks>
		[Obsolete("Use the BufferingAppenderSkeleton Fix methods")]
		public bool LocationInfo
		{
			get { return false; }
			set { ; }
		}

		/// <summary>
		/// The mode to use to authentication with the SMTP server
		/// </summary>
		/// <remarks>
		/// <note type="caution">Authentication is only available on the MS .NET 1.1 runtime.</note>
		/// <para>
		/// Valid Authentication mode values are: <see cref="SmtpAuthentication.None"/>, 
		/// <see cref="SmtpAuthentication.Basic"/>, and <see cref="SmtpAuthentication.Ntlm"/>. 
		/// The default value is <see cref="SmtpAuthentication.None"/>. When using 
		/// <see cref="SmtpAuthentication.Basic"/> you must specify the <see cref="Username"/> 
		/// and <see cref="Password"/> to use to authenticate.
		/// When using <see cref="SmtpAuthentication.Ntlm"/> the Windows credentials for the current
		/// thread, if impersonating, or the process will be used to authenticate. 
		/// </para>
		/// </remarks>
		public SmtpAuthentication Authentication
		{
			get { return m_authentication; }
			set { m_authentication = value; }
		}

		/// <summary>
		/// The username to use to authenticate with the SMTP server
		/// </summary>
		/// <remarks>
		/// <note type="caution">Authentication is only available on the MS .NET 1.1 runtime.</note>
		/// <para>
		/// A <see cref="Username"/> and <see cref="Password"/> must be specified when 
		/// <see cref="Authentication"/> is set to <see cref="SmtpAuthentication.Basic"/>, 
		/// otherwise the username will be ignored. 
		/// </para>
		/// </remarks>
		public string Username
		{
			get { return m_username; }
			set { m_username = value; }
		}

		/// <summary>
		/// The password to use to authenticate with the SMTP server
		/// </summary>
		/// <remarks>
		/// <note type="caution">Authentication is only available on the MS .NET 1.1 runtime.</note>
		/// <para>
		/// A <see cref="Username"/> and <see cref="Password"/> must be specified when 
		/// <see cref="Authentication"/> is set to <see cref="SmtpAuthentication.Basic"/>, 
		/// otherwise the password will be ignored. 
		/// </para>
		/// </remarks>
		public string Password
		{
			get { return m_password; }
			set { m_password = value; }
		}

		/// <summary>
		/// The port on which the SMTP server is listening
		/// </summary>
		/// <remarks>
		/// <note type="caution">Server Port is only available on the MS .NET 1.1 runtime.</note>
		/// <para>
		/// The port on which the SMTP server is listening. The default
		/// port is <c>25</c>. The Port can only be changed when running on
		/// the MS .NET 1.1 runtime.
		/// </para>
		/// </remarks>
		public int Port
		{
			get { return m_port; }
			set { m_port = value; }
		}

		/// <summary>
		/// Gets or sets the priority of the e-mail message