# Source code for bleak.backends.bluezdbus.scanner

    import sys
    from typing import TYPE_CHECKING

    if TYPE_CHECKING:
        if sys.platform != "linux":
            assert False, "This backend is only available on Linux"

    import logging
    from collections.abc import Callable, Coroutine
    from typing import Any, Literal, Optional
    from warnings import warn

    from dbus_fast import Variant

    from bleak._compat import override
    from bleak.args.bluez import BlueZDiscoveryFilters as _BlueZDiscoveryFilters
    from bleak.args.bluez import BlueZScannerArgs as _BlueZScannerArgs
    from bleak.backends.bluezdbus.defs import Device1
    from bleak.backends.bluezdbus.manager import get_global_bluez_manager
    from bleak.backends.scanner import (
        AdvertisementData,
        AdvertisementDataCallback,
        BaseBleakScanner,
    )
    from bleak.exc import BleakError

    logger = logging.getLogger(__name__)

    _DEPRECATED: dict[str, Any] = {
        "BlueZDiscoveryFilters": _BlueZDiscoveryFilters,
        "BlueZScannerArgs": _BlueZScannerArgs,
    }

    def __getattr__(name: str):
        if value := _DEPRECATED.get(name):
            warn(
                f"importing {name} from bleak.backends.bluezdbus.scanner is deprecated, use bleak.args.bluez instead",
                DeprecationWarning,
                stacklevel=2,
            )
            return value
        raise AttributeError(f"module {__name__!r} has no attribute {name!r}")

    class BleakScannerBlueZDBus(BaseBleakScanner):
        """The native Linux Bleak BLE Scanner.

        For possible values for `filters`, see the parameters to the
        ``SetDiscoveryFilter`` method in the `BlueZ docs
        <https://github.com/bluez/bluez/blob/master/doc/org.bluez.Adapter.rst#void-setdiscoveryfilterdict-filter>`_

        Args:
            detection_callback:
                Optional function that will be called each time a device is
                discovered or advertising data has changed.
            service_uuids:
                Optional list of service UUIDs to filter on. Only advertisements
                containing this advertising data will be received. Specifying this
                also enables scanning while the screen is off on Android.
            scanning_mode:
                Set to ``"passive"`` to avoid the ``"active"`` scanning mode.
            **bluez:
                Dictionary of arguments specific to the BlueZ backend.
            **adapter (str):
                Bluetooth adapter to use for discovery.
        """

        def __init__(
            self,
            detection_callback: Optional[AdvertisementDataCallback],
            service_uuids: Optional[list[str]],
            scanning_mode: Literal["active", "passive"],
            *,
            bluez: _BlueZScannerArgs,
            **kwargs: Any,
        ):
            super().__init__(detection_callback, service_uuids)

            self._scanning_mode = scanning_mode

            # kwarg "device" is for backwards compatibility
            self._adapter: Optional[str] = kwargs.get("adapter", kwargs.get("device"))

            # callback from manager for stopping scanning if it has been started
            self._stop: Optional[Callable[[], Coroutine[Any, Any, None]]] = None

            # Discovery filters

            self._filters: dict[str, Variant] = {}

            self._filters["Transport"] = Variant("s", "le")
            self._filters["DuplicateData"] = Variant("b", False)

            if self._service_uuids:
                self._filters["UUIDs"] = Variant("as", self._service_uuids)

            filters = bluez.get("filters")

            if filters is not None:
                self.set_scanning_filter(filters=filters)

            self._or_patterns = bluez.get("or_patterns")

            if self._scanning_mode == "passive" and service_uuids:
                logger.warning(
                    "service uuid filtering is not implemented for passive scanning, use bluez or_patterns as a workaround"
                )

            if self._scanning_mode == "passive" and not self._or_patterns:
                raise BleakError("passive scanning mode requires bluez or_patterns")

        @override
        async def start(self) -> None:
            manager = await get_global_bluez_manager()

            if self._adapter:
                adapter_path = f"/org/bluez/{self._adapter}"
            else:
                adapter_path = manager.get_default_adapter()

            self.seen_devices = {}

            if self._scanning_mode == "passive":
                assert self._or_patterns is not None  # should be checked in __init__

                self._stop = await manager.passive_scan(
                    adapter_path,
                    self._or_patterns,
                    self._handle_advertising_data,
                    self._handle_device_removed,
                )
            else:
                self._stop = await manager.active_scan(
                    adapter_path,
                    self._filters,
                    self._handle_advertising_data,
                    self._handle_device_removed,
                )

        @override
        async def stop(self) -> None:
            if self._stop:
                # avoid reentrancy
                stop, self._stop = self._stop, None

                await stop()

        def set_scanning_filter(self, **kwargs: Any) -> None:
            """Sets OS level scanning filters for the BleakScanner.

            For possible values for `filters`, see the parameters to the
            ``SetDiscoveryFilter`` method in the `BlueZ docs
            <https://github.com/bluez/bluez/blob/master/doc/org.bluez.Adapter.rst#void-setdiscoveryfilterdict-filter>`_

            See variant types here: <https://python-dbus-next.readthedocs.io/en/latest/type-system/>

            Keyword Args:
                filters (dict): A dict of filters to be applied on discovery.

            """
            for k, v in kwargs.get("filters", {}).items():
                if k == "UUIDs":
                    self._filters[k] = Variant("as", v)
                elif k == "RSSI":
                    self._filters[k] = Variant("n", v)
                elif k == "Pathloss":
                    self._filters[k] = Variant("n", v)
                elif k == "Transport":
                    self._filters[k] = Variant("s", v)
                elif k == "DuplicateData":
                    self._filters[k] = Variant("b", v)
                elif k == "Discoverable":
                    self._filters[k] = Variant("b", v)
                elif k == "Pattern":
                    self._filters[k] = Variant("s", v)
                else:
                    logger.warning("Filter '%s' is not currently supported.", k)

        # Helper methods

        def _handle_advertising_data(self, path: str, props: Device1) -> None:
            """
            Handles advertising data received from the BlueZ manager instance.

            Args:
                path: The D-Bus object path of the device.
                props: The D-Bus object properties of the device.
            """
            _service_uuids = props.get("UUIDs", [])

            if not self.is_allowed_uuid(_service_uuids):
                return

            # Get all the information wanted to pack in the advertisement data
            _local_name = props.get("Name")
            _manufacturer_data = {
                k: bytes(v) for k, v in props.get("ManufacturerData", {}).items()
            }
            _service_data = {k: bytes(v) for k, v in props.get("ServiceData", {}).items()}

            # Get tx power data
            tx_power = props.get("TxPower")

            # Pack the advertisement data
            advertisement_data = AdvertisementData(
                local_name=_local_name,
                manufacturer_data=_manufacturer_data,
                service_data=_service_data,
                service_uuids=_service_uuids,
                tx_power=tx_power,
                rssi=props.get("RSSI", -127),
                platform_data=(path, props),
            )

            device = self.create_or_update_device(
                path,
                props["Address"],
                # BlueZ generates a name based on the address if no name is available.
                # To match other backends, we replace this with None.
                (
                    None
                    if props["Alias"] == props["Address"].replace(":", "-")
                    else props["Alias"]
                ),
                {"path": path, "props": props},
                advertisement_data,
            )

            self.call_detection_callbacks(device, advertisement_data)

        def _handle_device_removed(self, device_path: str) -> None:
            """
            Handles a device being removed from BlueZ.
            """
            try:
                del self.seen_devices[device_path]
            except KeyError:
                # The device will not have been added to self.seen_devices if no
                # advertising data was received, so this is expected to happen
                # occasionally.
                pass