using System;
using System.Collections.Generic;
using System.IO;
using Indy.IL2CPU.Assembler;


using CPU = Indy.IL2CPU.Assembler.X86;
using System.Reflection;
using Indy.IL2CPU.Compiler;

namespace Indy.IL2CPU.IL.X86 {
	[OpCode(OpCodeEnum.Ldtoken)]
	public class Ldtoken: Op {
		private string mTokenAddress;

        //public static void ScanOp(ILReader aReader, MethodInformation aMethodInfo, SortedList<string, object> aMethodData) {
        //    FieldInfo xFieldDef = aReader.OperandValueField;
        //    if (xFieldDef != null)
        //    {
        //        if (!xFieldDef.IsStatic)
        //        {
        //            throw new Exception("Nonstatic field-backed tokens not supported yet!");
        //        }
        //        Engine.QueueStaticField(xFieldDef);
        //        return;
        //    }
        //    Type xTypeRef = aReader.OperandValueType;
        //    if (xTypeRef != null)
        //    {
        //        return;
        //    }
        //    throw new Exception("Token type not supported yet!");
        //}

		public Ldtoken(ILReader aReader, MethodInformation aMethodInfo)
			: base(aReader, aMethodInfo) {
			// todo: add support for type tokens and method tokens
			FieldInfo xFieldDef = aReader.OperandValueField;
			if (xFieldDef != null) {
				if (!xFieldDef.IsStatic) {
					throw new Exception("Nonstatic field-backed tokens not supported yet!");
				}
				mTokenAddress = DataMember.GetStaticFieldName(xFieldDef);
				return;
			}
			mType= aReader.OperandValueType;
            if (mType != null)
            {
                return;
            }
			throw new Exception("Token type not supported yet!");
		}

        private Type mType;

		public override void DoAssemble() {
            if (mType != null)
            {
                mTokenAddress = GetService<IMetaDataInfoService>().GetTypeIdLabel(mType);
            }
            new CPU.Push { DestinationRef = ElementReference.New(mTokenAddress) };
			Assembler.StackContents.Push(new StackContent(4, typeof(uint)));
		}
	}
}