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_I1)]
    public class Conv_I1 : Op
    {
        private string mNextLabel;
        private string mCurLabel;
        private uint mCurOffset;
        private MethodInformation mMethodInformation;
        public Conv_I1(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_I1: Floats not yet implemented", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
                return;
            }
            switch (xSource.Size)
            {
                case 1:
                    new CPUx86.Noop();
                    break;
                case 2:
                case 4:
                    new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
                    new CPUx86.SignExtendAX { Size = 8 };
                    new CPUx86.SignExtendAX { Size = 16 };
                    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 = 8 };
                    new CPUx86.SignExtendAX { Size = 16 };
                    new CPUx86.Push { DestinationReg = CPUx86.Registers.EAX };
                    break;
                default:
                    EmitNotImplementedException(Assembler, GetServiceProvider(), "Conv_I1: SourceSize " + xSource + " not supported!", mCurLabel, mMethodInformation, mCurOffset, mNextLabel);
                    return;
            }
            Assembler.StackContents.Push(new StackContent(1, true, false, true));
        }
    }
}