using System;

using CPUx86 = Indy.IL2CPU.Assembler.X86;
using Indy.IL2CPU.Assembler;

namespace Indy.IL2CPU.IL.X86 {
	[OpCode(OpCodeEnum.Conv_U4)]
	public class Conv_U4: Op {
        private string mNextLabel;
	    private string mCurLabel;
	    private uint mCurOffset;
	    private MethodInformation mMethodInformation;
		public Conv_U4(ILReader aReader, MethodInformation aMethodInfo)
			: base(aReader, aMethodInfo) {
             mMethodInformation = aMethodInfo;
		    mCurOffset = aReader.Position;
		    mCurLabel = IL.Op.GetInstructionLabel(aReader);
            mNextLabel = IL.Op.GetInstructionLabel(aReader.NextPosition);
		}
		public override void DoAssemble() {
			// todo: WARNING: not implemented correctly!
			var xStackItem = Assembler.StackContents.Pop();
			if (xStackItem.IsFloat) {
                EmitNotImplementedException(Assembler, GetServiceProvider(), "Conv_U4: Floats not yet supported", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
				return;
			}
			switch (xStackItem.Size) {
				case 1:
				case 2: {
						new CPUx86.Noop();
						break;
					}
				case 8: {
						new CPUx86.Pop{DestinationReg = CPUx86.Registers.EAX};
                        new CPUx86.Pop { DestinationReg = CPUx86.Registers.ECX };
                        new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX };
						break;
					}
				case 4: {
						new CPUx86.Noop();
						break;
					}
				default:
                    EmitNotImplementedException(Assembler, GetServiceProvider(), "Conv_U4: SourceSize " + xStackItem.Size + " not supported!", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
                    return;
			}
			Assembler.StackContents.Push(new StackContent(4, typeof(uint)));
		}
	}
}