"""Windows Registry plugin for the Microsoft Office MRU."""

import re

from dfdatetime import filetime as dfdatetime_filetime

from plaso.containers import events
from plaso.parsers import winreg_parser
from plaso.parsers.winreg_plugins import interface


class OfficeMRUWindowsRegistryEventData(events.EventData):
    """Microsoft Office MRU Windows Registry event data.

    Attributes:
      key_path (str): Windows Registry key path.
      last_written_time (dfdatetime.DateTimeValues): entry last written date and time.
      value_string (str): MRU value.
    """

    DATA_TYPE = "windows:registry:office_mru"

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


class OfficeMRUListWindowsRegistryEventData(events.EventData):
    """Microsoft Office MRU list Windows Registry event data.

    Attributes:
      entries (str): most recently used (MRU) entries.
      key_path (str): Windows Registry key path.
      last_written_time (dfdatetime.DateTimeValues): entry last written date and time.
    """

    DATA_TYPE = "windows:registry:office_mru_list"

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


class OfficeMRUPlugin(interface.WindowsRegistryPlugin):
    """Plugin that parses Microsoft Office MRU keys."""

    NAME = "microsoft_office_mru"
    DATA_FORMAT = "Microsoft Office MRU Registry data"

    FILTERS = frozenset(
        [
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "Access\\File MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "Access\\Place MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "Excel\\File MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "Excel\\Place MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "PowerPoint\\File MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "PowerPoint\\Place MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "Word\\File MRU"
            ),
            interface.WindowsRegistryKeyPathFilter(
                "HKEY_CURRENT_USER\\Software\\Microsoft\\Office\\14.0\\"
                "Word\\Place MRU"
            ),
        ]
    )

    _RE_VALUE_NAME = re.compile(r"^Item [0-9]+$", re.I)

    # The Office 12 item MRU is formatted as:
    # [F00000000][T%FILETIME%]*\\%FILENAME%

    # The Office 14 item MRU is formatted as:
    # [F00000000][T%FILETIME%][O00000000]*%FILENAME%
    _RE_VALUE_DATA = re.compile(r"\[F00000000\]\[T([0-9A-Z]+)\].*\*[\\]?(.*)")

    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.
        """
        # TODO: Test other Office versions to make sure this plugin is applicable.
        entries = []
        for registry_value in registry_key.GetValues():
            # Ignore any value not in the form: 'Item [0-9]+'.
            if not registry_value.name or not self._RE_VALUE_NAME.search(
                registry_value.name
            ):
                continue

            # Ignore any value that is empty or that does not contain a string.
            if not registry_value.data or not registry_value.DataIsString():
                continue

            value_string = registry_value.GetDataAsObject()
            values = self._RE_VALUE_DATA.findall(value_string)

            # Values will contain a list containing a tuple containing 2 values.
            if len(values) != 1 or len(values[0]) != 2:
                continue

            filetime_string, _ = values[0]

            try:
                timestamp = int(filetime_string, 16)
            except ValueError:
                parser_mediator.ProduceWarning(
                    f"unable to convert FILETIME string: '{filetime_string:s}' to an "
                    f"integer for value: '{registry_value.name:s}'."
                )
                continue

            event_data = OfficeMRUWindowsRegistryEventData()
            event_data.key_path = registry_key.path
            # TODO: split value string in individual values.
            event_data.value_string = value_string

            if timestamp:
                event_data.last_written_time = dfdatetime_filetime.Filetime(
                    timestamp=timestamp
                )

            parser_mediator.ProduceEventData(event_data)

            entries.append(f"{registry_value.name:s}: {value_string:s}")

        event_data = OfficeMRUListWindowsRegistryEventData()
        event_data.entries = " ".join(entries) or None
        event_data.key_path = registry_key.path
        event_data.last_written_time = registry_key.last_written_time

        parser_mediator.ProduceEventData(event_data)


winreg_parser.WinRegistryParser.RegisterPlugin(OfficeMRUPlugin)
