//
// System.Reflection/Module.cs
//
// Author:
//   Paolo Molaro (lupus@ximian.com)
//
// (C) 2001 Ximian, Inc.  http://www.ximian.com
// Copyright (C) 2004-2005 Novell, Inc (http://www.novell.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.Runtime.Serialization;
using System.Security.Cryptography.X509Certificates;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
using System.Security;
using System.Security.Permissions;
using System.Collections.Generic;

namespace System.Reflection {

	internal enum ResolveTokenError {
		OutOfRange,
		BadTable,
		Other
	};

	[Serializable]
	[StructLayout (LayoutKind.Sequential)]
	partial class Module {
		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern int get_MetadataToken (Module module);
		
		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern int GetMDStreamVersion (IntPtr module_handle);
	
		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal extern Type[] InternalGetTypes ();

		internal Guid MvId {
			get {
				return GetModuleVersionId ();
			}
		}

		internal Exception resolve_token_exception (int metadataToken, ResolveTokenError error, string tokenType) {
			if (error == ResolveTokenError.OutOfRange)
				return new ArgumentOutOfRangeException ("metadataToken", String.Format ("Token 0x{0:x} is not valid in the scope of module {1}", metadataToken, Name));
			else
				return new ArgumentException (String.Format ("Token 0x{0:x} is not a valid {1} token in the scope of module {2}", metadataToken, tokenType, Name), "metadataToken");
		}

		internal IntPtr[] ptrs_from_types (Type[] types) {
			if (types == null)
				return null;
			else {
				IntPtr[] res = new IntPtr [types.Length];
				for (int i = 0; i < types.Length; ++i) {
					if (types [i] == null)
						throw new ArgumentException ();
					res [i] = types [i].TypeHandle.Value;
				}
				return res;
			}
		}

		internal static Type MonoDebugger_ResolveType (Module module, int token)
		{
			ResolveTokenError error;

			IntPtr handle = ResolveTypeToken (module.GetImpl (), token, null, null, out error);
			if (handle == IntPtr.Zero)
				return null;
			else
				return Type.GetTypeFromHandle (new RuntimeTypeHandle (handle));
		}

		// Used by mcs, the symbol writer, and mdb through reflection
		internal static Guid Mono_GetGuid (Module module)
		{
			return module.GetModuleVersionId ();
		}

		internal virtual Guid GetModuleVersionId ()
		{
			return new Guid (GetGuidInternal ());
		}

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal extern IntPtr GetHINSTANCE ();

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		private extern string GetGuidInternal ();

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal extern Type GetGlobalType ();

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern IntPtr ResolveTypeToken (IntPtr module, int token, IntPtr[] type_args, IntPtr[] method_args, out ResolveTokenError error);

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern IntPtr ResolveMethodToken (IntPtr module, int token, IntPtr[] type_args, IntPtr[] method_args, out ResolveTokenError error);

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern IntPtr ResolveFieldToken (IntPtr module, int token, IntPtr[] type_args, IntPtr[] method_args, out ResolveTokenError error);

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern string ResolveStringToken (IntPtr module, int token, out ResolveTokenError error);

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern MemberInfo ResolveMemberToken (IntPtr module, int token, IntPtr[] type_args, IntPtr[] method_args, out ResolveTokenError error);

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern byte[] ResolveSignature (IntPtr module, int metadataToken, out ResolveTokenError error);

		[MethodImplAttribute (MethodImplOptions.InternalCall)]
		internal static extern void GetPEKind (IntPtr module, out PortableExecutableKinds peKind, out ImageFileMachine machine);

		public virtual X509Certificate GetSignerCertificate ()
		{
			throw NotImplemented.ByDesign;
		}

		internal virtual IntPtr GetImpl () {
			throw NotImplemented.ByDesign;
		}
	}
}