//
// Copyright (C) 2004 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.
//

//
// System.Reflection.Emit/SignatureHelper.cs
//
// Author:
//   Paolo Molaro (lupus@ximian.com)
//
// (C) 2001 Ximian, Inc.  http://www.ximian.com
//

using System;
using System.Reflection;
using System.Reflection.Emit;
using System.Globalization;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;

namespace System.Reflection.Emit {
#if NET_2_0
	[ComVisible (true)]
	[ComDefaultInterface (typeof (_SignatureHelper))]
#endif
	[ClassInterface (ClassInterfaceType.None)]
	public sealed class SignatureHelper : _SignatureHelper {
		internal enum SignatureHelperType {
			HELPER_FIELD,
			HELPER_LOCAL,
			HELPER_METHOD,
			HELPER_PROPERTY
		}

		private ModuleBuilder module; // can be null in 2.0
		private Type[] arguments;
		private SignatureHelperType type;
		private Type returnType;
		private CallingConventions callConv;
		private CallingConvention unmanagedCallConv;

		internal SignatureHelper (ModuleBuilder module, SignatureHelperType type)
		{
			this.type = type;
			this.module = module;
		}

		public static SignatureHelper GetFieldSigHelper (Module mod)
		{
			if (mod != null && !(mod is ModuleBuilder))
				throw new ArgumentException ("ModuleBuilder is expected");

			return new SignatureHelper ((ModuleBuilder) mod, SignatureHelperType.HELPER_FIELD);
		}

		public static SignatureHelper GetLocalVarSigHelper (Module mod)
		{
			if (mod != null && !(mod is ModuleBuilder))
				throw new ArgumentException ("ModuleBuilder is expected");

			return new SignatureHelper ((ModuleBuilder) mod, SignatureHelperType.HELPER_LOCAL);
		}

#if NET_2_0
		public static SignatureHelper GetLocalVarSigHelper ()
		{
			return new SignatureHelper (null, SignatureHelperType.HELPER_LOCAL);
		}

		public static SignatureHelper GetMethodSigHelper(CallingConventions callingConvention, Type returnType)
		{
			return GetMethodSigHelper (null, callingConvention, (CallingConvention)0, returnType, null);
		}

		public static SignatureHelper GetMethodSigHelper (CallingConvention unmanagedCallingConvention,
								  Type returnType)
		{
			return GetMethodSigHelper (null, CallingConventions.Standard, unmanagedCallingConvention, returnType, null);
		}
#endif

		public static SignatureHelper GetMethodSigHelper( Module mod, CallingConventions callingConvention, Type returnType)
		{
			return GetMethodSigHelper (mod, callingConvention, (CallingConvention)0, returnType, null);
		}

		public static SignatureHelper GetMethodSigHelper( Module mod, CallingConvention unmanagedCallingConvention, Type returnType)
		{
			return GetMethodSigHelper (mod, CallingConventions.Standard, unmanagedCallingConvention, returnType, null);
		}

		public static SignatureHelper GetMethodSigHelper( Module mod, Type returnType, Type[] parameterTypes)
		{
			return GetMethodSigHelper (mod, CallingConventions.Standard, 
									   (CallingConvention)0, returnType, 
									   parameterTypes);
		}
		[MonoTODO("Not implemented")]
		public static SignatureHelper GetPropertySigHelper( Module mod, Type returnType, Type[] parameterTypes)
		{
			throw new NotImplementedException ();
		}

#if NET_2_0
		[MonoTODO("Not implemented")]
		public static SignatureHelper GetPropertySigHelper (Module mod, Type returnType,
								    Type [] requiredReturnTypeCustomModifiers,
								    Type [] optionalReturnTypeCustomModifiers,
								    Type [] parameterTypes,
								    Type [] [] requiredParameterTypeCustomModifiers,
								    Type [] [] optionalParameterTypeCustomModifiers)
		{
			throw new NotImplementedException ();
		}
#endif

		public void AddArgument (Type clsArgument)
		{
			if (arguments != null) {
				Type[] new_a = new Type [arguments.Length + 1];
				System.Array.Copy (arguments, new_a, arguments.Length);
				new_a [arguments.Length] = clsArgument;
				arguments = new_a;
			} else {
				arguments = new Type [1];
				arguments [0] = clsArgument;
			}
		}

#if NET_2_0
		[MonoTODO ("pinned is ignored")]
		public void AddArgument (Type argument, bool pinned)
		{
			AddArgument (argument);
		}

		[MonoTODO ("not implemented")]
		public void AddArgument (Type argument, Type [] requiredCustomModifiers, Type [] optionalCustomModifiers)
		{
			throw new NotImplementedException ();
		}
#endif

		[MonoTODO("Not implemented")]
		public void AddSentinel ()
		{
			throw new NotImplementedException ();
		}

		[MonoTODO("Not implemented")]
		public override bool Equals (object obj)
		{
			throw new NotImplementedException ();
		}

		[MonoTODO("Not implemented")]
		public override int GetHashCode ()
		{
			throw new NotImplementedException ();
		}

		[MethodImplAttribute(MethodImplOptions.InternalCall)]
		internal extern byte[] get_signature_local ();

		[MethodImplAttribute(MethodImplOptions.InternalCall)]
		internal extern byte[] get_signature_field ();

		public byte[] GetSignature ()
		{
			switch (type) {
			case SignatureHelperType.HELPER_LOCAL:
				return get_signature_local ();
			case SignatureHelperType.HELPER_FIELD:
				return get_signature_field ();
			default:
				throw new NotImplementedException ();
			}
		}

		public override string ToString() {
			return "SignatureHelper";
		}

		internal static SignatureHelper GetMethodSigHelper( Module mod, CallingConventions callConv, CallingConvention unmanagedCallConv, Type returnType,
														   Type [] parameters)
		{
			if (mod != null && !(mod is ModuleBuilder))
				throw new ArgumentException ("ModuleBuilder is expected");

			SignatureHelper helper = 
				new SignatureHelper ((ModuleBuilder)mod, SignatureHelperType.HELPER_METHOD);
			helper.returnType = returnType;
			helper.callConv = callConv;
			helper.unmanagedCallConv = unmanagedCallConv;

			if (parameters != null) {
				helper.arguments = new Type [parameters.Length];
				for (int i = 0; i < parameters.Length; ++i)
					helper.arguments [i] = parameters [i];
			}

			return helper;
		}

                void _SignatureHelper.GetIDsOfNames([In] ref Guid riid, IntPtr rgszNames, uint cNames, uint lcid, IntPtr rgDispId)
                {
                        throw new NotImplementedException ();
                }

                void _SignatureHelper.GetTypeInfo (uint iTInfo, uint lcid, IntPtr ppTInfo)
                {
                        throw new NotImplementedException ();
                }

                void _SignatureHelper.GetTypeInfoCount (out uint pcTInfo)
                {
                        throw new NotImplementedException ();
                }

                void _SignatureHelper.Invoke (uint dispIdMember, [In] ref Guid riid, uint lcid, short wFlags, IntPtr pDispParams, IntPtr pVarResult, IntPtr pExcepInfo, IntPtr puArgErr)
                {
                        throw new NotImplementedException ();
                }
	}
}