"""Windows Registry plugin to parse the RADAR Diagnosed Applications key."""

import os

from dfdatetime import filetime as dfdatetime_filetime
from dfdatetime import semantic_time as dfdatetime_semantic_time

from plaso.containers import events
from plaso.lib import dtfabric_helper
from plaso.lib import errors
from plaso.parsers import winreg_parser
from plaso.parsers.winreg_plugins import interface


class DiagnosedApplicationsEventData(events.EventData):
    """RADAR Diagnosed Application event data attribute container.

    Attributes:
      key_path (str): Windows Registry key path.
      last_detection_time (dfdatetime.DateTimeValues): process last
          detected by RADAR date and time.
      last_written_time (dfdatetime.DateTimeValues): entry last written date
          and time.
      process_name (str): Name of the process diagnosed by RADAR.
    """

    DATA_TYPE = "windows:registry:diagnosed_applications"

    def __init__(self):
        """Initializes event data."""
        super().__init__(data_type=self.DATA_TYPE)
        self.key_path = None
        self.last_detection_time = None
        self.last_written_time = None
        self.process_name = None


class DiagnosedApplicationsPlugin(
    interface.WindowsRegistryPlugin, dtfabric_helper.DtFabricHelper
):
    """RADAR Diagnosed Applications Windows Registry plugin."""

    NAME = "diagnosed_applications"
    DATA_FORMAT = "Diagnosed Applications Registry data"

    FILTERS = frozenset(
        [
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\RADAR\\HeapLeakDetection\\"
                "DiagnosedApplications"
            )
        ]
    )

    _DEFINITION_FILE = os.path.join(os.path.dirname(__file__), "filetime.yaml")

    def _ParseFiletime(self, byte_stream):
        """Parses a FILETIME date and time value from a byte stream.

        Args:
          byte_stream (bytes): byte stream.

        Returns:
          dfdatetime.DateTimeValues: a FILETIME date and time values or a semantic
              date and time values if the FILETIME date and time value is not set.

        Raises:
          ParseError: if the FILETIME could not be parsed.
        """
        filetime_map = self._GetDataTypeMap("filetime")

        try:
            filetime = self._ReadStructureFromByteStream(byte_stream, 0, filetime_map)
        except (ValueError, errors.ParseError) as exception:
            raise errors.ParseError(
                f"Unable to parse FILETIME value with error: {exception!s}"
            )

        if filetime == 0:
            return dfdatetime_semantic_time.NotSet()

        try:
            return dfdatetime_filetime.Filetime(timestamp=filetime)
        except ValueError:
            raise errors.ParseError(f"Invalid FILETIME value: 0x{filetime:08x}")

    def ExtractEvents(self, parser_mediator, registry_key, **kwargs):
        """Extracts events from a Windows Registry key.

        Args:
          parser_mediator (ParserMediator): mediates interactions between parsers
              and other components, such as storage and dfVFS.
          registry_key (dfwinreg.WinRegistryKey): Windows Registry key.
        """
        for subkey in registry_key.GetSubkeys():
            last_detection_value = subkey.GetValueByName("LastDetectionTime")
            date_time = self._ParseFiletime(last_detection_value.data)

            event_data = DiagnosedApplicationsEventData()
            event_data.key_path = subkey.path
            event_data.last_detection_time = date_time
            event_data.last_written_time = subkey.last_written_time
            event_data.process_name = subkey.name

            parser_mediator.ProduceEventData(event_data)


winreg_parser.WinRegistryParser.RegisterPlugin(DiagnosedApplicationsPlugin)
