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

namespace Indy.IL2CPU.IL.X86 {
	[OpCode(OpCodeEnum.Throw)]
	public class Throw: Op {
		private MethodInformation mMethodInfo;
		private int mCurrentILOffset;
        public Throw(ILReader aReader, MethodInformation aMethodInfo)
			: base(aReader, aMethodInfo) {
			mMethodInfo = aMethodInfo;
			mCurrentILOffset = (int)aReader.Position;
		}

		public static void Assemble(Assembler.Assembler aAssembler, MethodInformation aMethodInfo, int aCurrentILOffset, string aExceptionOccurredLabel) {
            new CPUx86.Pop { DestinationReg = CPUx86.Registers.EAX };
            new CPUx86.Move { DestinationRef = CPU.ElementReference.New(CPU.DataMember.GetStaticFieldName(CPU.Assembler.CurrentExceptionRef)), DestinationIsIndirect = true, SourceReg = CPUx86.Registers.EAX };
            new CPUx86.Call { DestinationLabel = aExceptionOccurredLabel };
            new CPUx86.Move { DestinationReg = CPUx86.Registers.ECX, SourceValue = 3 };
			Call.EmitExceptionLogic(aAssembler, (uint)aCurrentILOffset, aMethodInfo, null, false, null);
			aAssembler.StackContents.Pop();
		}
	
		public override void DoAssemble() {
		    var xMethodInfo = GetService<IMetaDataInfoService>().GetMethodInfo(CPU.Assembler.CurrentExceptionOccurredRef,
		                                                                       false);
			Assemble(Assembler, mMethodInfo, mCurrentILOffset, xMethodInfo.LabelName);
		}
	}
}