#region License
/* 
 * Copyright (C) 1999-2022 John Källén.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */
#endregion

using Reko.Core;
using Reko.Core.Expressions;
using Reko.Core.Machine;
using Reko.Core.Types;

namespace Reko.Arch.i8051
{
    public class MemoryOperand : AbstractMachineOperand
    {
        private MemoryOperand() : base(PrimitiveType.Byte)
        {

        }

        public static MemoryOperand Direct(Expression ea)
        {
            return new MemoryOperand { DirectAddress = ea };
        }

        public static MemoryOperand Indirect(Storage reg)
        {
            return new MemoryOperand { Register = reg };
        }

        public static MemoryOperand Indexed(Storage @base, RegisterStorage idx)
        {
            return new MemoryOperand { Register = @base, Index = idx };
        }

        public Expression? DirectAddress { get; set; }
        public Storage? Register { get; set; }
        public RegisterStorage? Index { get; set; }

        protected override void DoRender(MachineInstructionRenderer renderer, MachineInstructionRendererOptions options)
        {
            if (Index != null)
            {
                renderer.WriteString("@");
                renderer.WriteString(Register!.Name);
                renderer.WriteString("+");
                renderer.WriteString(Index.Name);
            }
            else
            {
                if (DirectAddress != null)
                {
                    renderer.WriteString("[");
                    if (DirectAddress is Constant c)
                    {
                        renderer.WriteString(c.ToUInt16().ToString("X4"));
                    }
                    else
                    {
                        renderer.WriteString(DirectAddress.ToString());
                    }
                    renderer.WriteString("]");
                }
                else
                    renderer.WriteString($"@{Register!.Name}");
            }
        }
    }
}