//
// AssemblyLoader.cs
//
// Author:
//       Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2013 Xamarin Inc. (http://xamarin.com)
//
// 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.
using System;
using System.Reflection;
using System.Threading;
using ICSharpCode.NRefactory.Documentation;
using ICSharpCode.NRefactory.TypeSystem;
using ICSharpCode.NRefactory.TypeSystem.Implementation;

namespace ICSharpCode.NRefactory.TypeSystem
{
	public enum AssemblyLoaderBackend {
		Auto,
		Cecil,
		IKVM
	}

	public abstract class AssemblyLoader
	{
		public static AssemblyLoader Create ()
		{
			return Create (AssemblyLoaderBackend.Auto);
		}
		
		public static AssemblyLoader Create (AssemblyLoaderBackend backend)
		{
			switch (backend) {
				case AssemblyLoaderBackend.Auto:
				case AssemblyLoaderBackend.Cecil:
					return (AssemblyLoader)Assembly.Load ("ICSharpCode.NRefactory.Cecil").CreateInstance ("ICSharpCode.NRefactory.TypeSystem.CecilLoader");
				case AssemblyLoaderBackend.IKVM:
					return (AssemblyLoader)Assembly.Load ("ICSharpCode.NRefactory.IKVM").CreateInstance ("ICSharpCode.NRefactory.TypeSystem.IkvmLoader");
				default:
					throw new ArgumentOutOfRangeException ();
			}
		}

		/// <summary>
		/// Specifies whether to include internal members. The default is false.
		/// </summary>
		public bool IncludeInternalMembers { get; set; }
		
		/// <summary>
		/// Gets/Sets the cancellation token used by the assembly loader.
		/// </summary>
		public CancellationToken CancellationToken { get; set; }
		
		/// <summary>
		/// Gets/Sets the documentation provider that is used to retrieve the XML documentation for all members.
		/// </summary>
		public IDocumentationProvider DocumentationProvider { get; set; }

		[CLSCompliant(false)]
		protected InterningProvider interningProvider = new SimpleInterningProvider();

		/// <summary>
		/// Gets/Sets the interning provider.
		/// </summary>
		public InterningProvider InterningProvider {
			get { return interningProvider; }
			set {
				if (value == null)
					throw new ArgumentNullException();
				interningProvider = value;
			}
		}
		
		public abstract IUnresolvedAssembly LoadAssemblyFile(string fileName);
	}
}