using System;
using System.IO;
using CPU = Indy.IL2CPU.Assembler;
using Indy.IL2CPU.Assembler;
using CPUx86 = Indy.IL2CPU.Assembler.X86;

namespace Indy.IL2CPU.IL.X86 {
	[OpCode(OpCodeEnum.Conv_I2)]
	public class Conv_I2: Op {
        private string mNextLabel;
	    private string mCurLabel;
	    private uint mCurOffset;
	    private MethodInformation mMethodInformation;
		public Conv_I2(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() {
			StackContent xSource = Assembler.StackContents.Pop();
			if (xSource.IsFloat) {
                EmitNotImplementedException(Assembler, GetServiceProvider(), "Conv_I2: Floats not yet implemented", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
                return;
			}
			switch (xSource.Size) {
				case 1:
				case 2:
					new CPUx86.Noop();
					break;
				case 4:
                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
					new CPUx86.Push{DestinationReg=CPUx86.Registers.EAX};
					break;
				case 8:
                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EBX };
                    new CPUx86.SignExtendAX { Size = 16 };
                    new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX };
					break;
				default:
					throw new Exception("SourceSize " + xSource + " not supported!");
			}
			Assembler.StackContents.Push(new StackContent(2, true, false, true));
		}
	}
}