#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.Services;
using Reko.Gui.Services;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Reko.Gui.Commands
{
    public class Cmd_ViewWhatPointsHere : Command
    {
        private readonly Program program;
        private readonly IEnumerable<Address> addresses;

        public Cmd_ViewWhatPointsHere(IServiceProvider services, Program program, IEnumerable<Address> addresses)
           : base(services)
        {
            this.program = program;
            this.addresses = addresses;
        }

        public override ValueTask DoItAsync()
        {
            var resultSvc = Services.RequireService<ISearchResultService>();
            var arch = program.Architecture;
            var progAddresses = program.SegmentMap.Segments.Values
                .Where(s => s.MemoryArea != null)
                .SelectMany(s => GetPointersInSegment(s));
            resultSvc.ShowSearchResults(
                new AddressSearchResult(
                    Services,
                    progAddresses,
                    new CodeSearchDetails()));
            return ValueTask.CompletedTask;
        }

        private IEnumerable<AddressSearchHit> GetPointersInSegment(ImageSegment s)
        {
            var rdr = s.CreateImageReader(program.Architecture);
            return program.Platform.CreatePointerScanner(
                    program.SegmentMap,
                    rdr,
                    addresses,
                    PointerScannerFlags.All)
                    .Select(a => new AddressSearchHit(program, a, 1));
        }
    }
}
