"""Java java.util.Date timestamp implementation."""

import decimal

from dfdatetime import definitions
from dfdatetime import factory
from dfdatetime import posix_time


class JavaTime(posix_time.PosixTimeInMilliseconds):
    """Java java.util.Date timestamp.

    The Java java.util.Date timestamp is a signed integer that contains the
    number of milliseconds since 1970-01-01 00:00:00 (also known as the POSIX
    epoch). Negative values represent date and times predating the POSIX epoch.

    Also see:
      https://docs.oracle.com/javase/8/docs/api/java/util/Date.html

    Attributes:
      is_local_time (bool): True if the date and time value is in local time.
    """

    def _GetNormalizedTimestamp(self):
        """Retrieves the normalized timestamp.

        Returns:
          decimal.Decimal: normalized timestamp, which contains the number of
              seconds since January 1, 1970 00:00:00 and a fraction of second used
              for increased precision, or None if the normalized timestamp cannot be
              determined.
        """
        if self._normalized_timestamp is None:
            if (
                self._timestamp is not None
                and self._timestamp >= self._INT64_MIN
                and self._timestamp <= self._INT64_MAX
            ):
                self._normalized_timestamp = (
                    decimal.Decimal(self._timestamp)
                    / definitions.MILLISECONDS_PER_SECOND
                )

                if self._time_zone_offset:
                    self._normalized_timestamp -= self._time_zone_offset * 60

        return self._normalized_timestamp

    def CopyToDateTimeString(self):
        """Copies the POSIX timestamp to a date and time string.

        Returns:
          str: date and time value formatted as: "YYYY-MM-DD hh:mm:ss.######" or
              None if the timestamp is missing.
        """
        if (
            self._timestamp is None
            or self._timestamp < self._INT64_MIN
            or self._timestamp > self._INT64_MAX
        ):
            return None

        return super().CopyToDateTimeString()


factory.Factory.RegisterDateTimeValues(JavaTime)
