// ****************************************************************

// Copyright 2007, Charlie Poole

// This is free software licensed under the NUnit license. You may

// obtain a copy of the license at http://nunit.org

// ****************************************************************



using System;

using System.IO;

using System.Diagnostics;

using System.Collections;

using System.Reflection;

using NUnit.Core;

using NUnit.Core.Extensibility;



namespace NUnit.Util

{

	public class AddinManager : IService

	{

		static Logger log = InternalTrace.GetLogger(typeof(AddinManager));



		#region Instance Fields

		IAddinRegistry addinRegistry;

		#endregion



		#region Constructor

		public AddinManager()

		{

		}

		#endregion



		#region Addin Registration

		public void RegisterAddins()

		{

			// Load any extensions in the addins directory

			DirectoryInfo dir = new DirectoryInfo( NUnitConfiguration.AddinDirectory );

			if ( dir.Exists )

				foreach( FileInfo file in dir.GetFiles( "*.dll" ) )

					Register( file.FullName );

		}



		public void Register( string path )

		{

			try

			{

				AssemblyName assemblyName = new AssemblyName();

				assemblyName.Name = Path.GetFileNameWithoutExtension(path);

				assemblyName.CodeBase = path;

				Assembly assembly = Assembly.Load(assemblyName);

				log.Debug( "Loaded " + Path.GetFileName(path) );



				foreach ( Type type in assembly.GetExportedTypes() )

				{

					if ( type.GetCustomAttributes(typeof(NUnitAddinAttribute), false).Length == 1 )

					{

						Addin addin = new Addin( type );

                        if ( addinRegistry.IsAddinRegistered(addin.Name) )

                            log.Error( "Addin {0} was already registered", addin.Name );

                        else

                        {

						    addinRegistry.Register( addin );

						    log.Debug( "Registered addin: {0}", addin.Name );

                        }

					}

				}

			}

			catch( Exception ex )

			{

				// NOTE: Since the gui isn't loaded at this point, 

				// the trace output will only show up in Visual Studio

				log.Error( "Failed to load" + path, ex  );

			}

		}

		#endregion



		#region IService Members



		public void InitializeService()

		{

			addinRegistry = Services.AddinRegistry;

			RegisterAddins();

		}



		public void UnloadService()

		{

		}



		#endregion

	}

}