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

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

        public override void Execute( MethodInfo aMethod, ILOpCode aOpCode )
        {
            var xStackContent = Assembler.Stack.Peek();

            if( xStackContent.IsFloat )
                throw new NotImplementedException( "Floats not yet supported!" );
            
            int xSize = Math.Max( Assembler.Stack.Pop().Size, Assembler.Stack.Pop().Size );
            if( xSize > 8 )
                throw new NotImplementedException( "StackSize>8 not supported" );
            
            if( xSize > 4 )
            {
                new CPU.Pop { DestinationReg = CPU.Registers.EAX };
                new CPU.Pop { DestinationReg = CPU.Registers.EBX };
                new CPU.Pop { DestinationReg = CPU.Registers.EDX };
                new CPU.Pop { DestinationReg = CPU.Registers.ECX };
                new CPU.And { DestinationReg = CPU.Registers.EAX, SourceReg = CPU.Registers.EDX };
                new CPU.And { DestinationReg = CPU.Registers.EBX, SourceReg = CPU.Registers.ECX };
                new CPU.Push { DestinationReg = CPU.Registers.EBX };
                new CPU.Push { DestinationReg = CPU.Registers.EAX };
            }
            else
            {
                new CPU.Pop { DestinationReg = CPU.Registers.EAX };
                new CPU.Pop { DestinationReg = CPU.Registers.EDX };
                new CPU.And { DestinationReg = CPU.Registers.EAX, SourceReg = CPU.Registers.EDX };
                new CPU.Push { DestinationReg = CPU.Registers.EAX };
            }
            Assembler.Stack.Push( xStackContent );
        }

    }
}