Function removeSignal

src/OpenLoco/src/GameCommands/Track/RemoveSignal.cpp:84–182

0x004891E4

    // 0x004891E4
    static currency32_t removeSignal(const SignalRemovalArgs& args, uint8_t flags)
    {
        setExpenditureType(ExpenditureType::Construction);
        setPosition(args.pos + World::Pos3{ 16, 16, 0 });

        auto* elTrack = getElTrackAt(args, args.pos, args.index);

        if (elTrack == nullptr)
        {
            return kFailure;
        }

        if (!sub_431E6A(elTrack->owner(), reinterpret_cast<World::TileElement*>(elTrack)))
        {
            return kFailure;
        }

        const auto trackPieces = World::TrackData::getTrackPiece(args.trackId);
        auto& trackPiece = trackPieces[args.index];

        const auto trackStart = args.pos - World::Pos3{ Math::Vector::rotate(World::Pos2{ trackPiece.x, trackPiece.y }, args.rotation), trackPiece.z };

        currency32_t cost = signalRemoveCost(args, trackPieces[0], trackStart);

        if (static_cast<uint32_t>(cost) == kFailure)
        {
            return kFailure;
        }

        for (auto& piece : trackPieces)
        {
            const auto trackLoc = trackStart + World::Pos3{ Math::Vector::rotate(World::Pos2{ piece.x, piece.y }, args.rotation), piece.z };
            auto* pieceElTrack = getElTrackAt(args, trackLoc, piece.index);
            if (pieceElTrack == nullptr)
            {
                return kFailure;
            }

            if (!(flags & Flags::apply))
            {
                continue;
            }

            if (!pieceElTrack->hasSignal())
            {
                return 0;
            }

            auto* elSignal = pieceElTrack->next()->as<World::SignalElement>();
            if (elSignal == nullptr)
            {
                return kFailure;
            }

            if (args.flags & (1U << 15))
            {
                if (!(flags & Flags::ghost) || elSignal->isLeftGhost())
                {