#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.Arch.X86;
using Reko.Core;
using Reko.Core.Emulation;
using Reko.Core.Expressions;
using Reko.Core.Machine;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Reko.Environments.Msdos
{
    public class MsdosEmulator : IPlatformEmulator
    {
        public MsdosEmulator()
        {
            this.InterceptedCalls = new Dictionary<Address, ExternalProcedure>();
        }

        public Dictionary<Address, ExternalProcedure> InterceptedCalls { get; }

        public bool InterceptCall(IProcessorEmulator emulator, uint calledAddress)
        {
            return false;
        }

        public bool EmulateSystemCall(IProcessorEmulator emulator, params MachineOperand[] operands)
        {
            return false;
        }

        public ImageSegment? InitializeStack(IProcessorEmulator emulator, ProcessorState state)
        {
            var cs = ((Constant) state.GetValue(Registers.cs)).ToUInt16();
            var ss = ((Constant) state.GetValue(Registers.ss)).ToUInt16();
            var sp = ((Constant) state.GetValue(Registers.sp)).ToUInt16();
            var ds = ((Constant) state.GetValue(Registers.ds)).ToUInt16();
            var es = ((Constant) state.GetValue(Registers.es)).ToUInt16();
            emulator.WriteRegister(Registers.cs, cs);
            emulator.WriteRegister(Registers.ss, ss);
            emulator.WriteRegister(Registers.sp, sp);
            emulator.WriteRegister(Registers.ds, ds);
            emulator.WriteRegister(Registers.es, es);
            return null;
        }

        public void TearDownStack(ImageSegment? stackSeg)
        {
        }
    }
}
