using System;
using CPUx86 = Cosmos.Assembler.x86;
using Cosmos.Assembler.x86;
using Cosmos.Assembler;
using Cosmos.Assembler.x86.SSE;
using XSharp.Compiler;
using static XSharp.Compiler.XSRegisters;

namespace Cosmos.IL2CPU.X86.IL
{
    [Cosmos.IL2CPU.OpCode( ILOpCode.Code.Add_Ovf )]
    public class Add_Ovf : ILOp
    {
		public Add_Ovf(Cosmos.Assembler.Assembler aAsmblr)
            : base( aAsmblr )
        {
        }

        public override void Execute( MethodInfo aMethod, ILOpCode aOpCode )
        {
			// TODO overflow check for float
            var xType = aOpCode.StackPopTypes[0];
            var xSize = SizeOfType(xType);
            var xIsFloat = TypeIsFloat(xType);
            if (xSize > 8)
            {
                //EmitNotImplementedException( Assembler, aServiceProvider, "Size '" + xSize.Size + "' not supported (add)", aCurrentLabel, aCurrentMethodInfo, aCurrentOffset, aNextLabel );
                throw new NotImplementedException("Cosmos.IL2CPU.x86->IL->Add_Ovf.cs->Error: StackSize > 8 not supported");
            }
            else
            {
				var xBaseLabel = GetLabel(aMethod, aOpCode) + ".";
				var xSuccessLabel = xBaseLabel + "Success";
                if (xSize > 4)
                {
                    if (xIsFloat)
                    {
						//TODO overflow check
                        XS.FPU.FloatLoad(ESP, destinationIsIndirect: true, size: RegisterSize.Long64);
                        XS.Add(ESP, 8);
                        new CPUx86.x87.FloatAdd { DestinationReg = CPUx86.RegistersEnum.ESP, DestinationIsIndirect=true, Size=64 };
                        XS.FPU.FloatStoreAndPop(ESP, isIndirect: true, size: RegisterSize.Long64);
                    }
                    else
                    {
                        XS.Pop(XSRegisters.EDX); // low part
                        XS.Pop(XSRegisters.EAX); // high part
                        XS.Add(ESP, EDX, destinationIsIndirect: true);
						XS.AddWithCarry(ESP, EAX, destinationDisplacement: 4);
                    }
                }
                else
                {
                    if (xIsFloat) //float
                    {
						//TODO overflow check
                        XS.SSE.MoveSS(XMM0, ESP, sourceIsIndirect: true);
                        XS.Add(XSRegisters.ESP, 4);
                        XS.SSE.MoveSS(XMM1, ESP, sourceIsIndirect: true);
                        XS.SSE.AddSS(XMM0, XMM1);
                        XS.SSE.MoveSS(XMM1, ESP, sourceIsIndirect: true);
                    }
                    else //integer
                    {
                        XS.Pop(XSRegisters.EAX);
                        XS.Add(ESP, EAX, destinationIsIndirect: true);
                    }
                }
				if (false == xIsFloat)
				{
					XS.Jump(ConditionalTestEnum.NoOverflow, xSuccessLabel);
					ThrowOverflowException();
				}
				XS.Label(xSuccessLabel);
            }
        }
    }
}