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from typing import Dict, NamedTuple, Optional, Union


class Timestamp:
    """A nanosecond-resolution timestamp."""

    def __init__(self, sec: float, nsec: float) -> None:
        if nsec < 0 or nsec >= 1e9:
            raise ValueError(f"Invalid value for nanoseconds in Timestamp: {nsec}")
        if sec < 0:
            nsec = -nsec
        self.sec: int = int(sec)
        self.nsec: int = int(nsec)

    def __str__(self) -> str:
        return f"{self.sec}.{self.nsec:09d}"

    def __repr__(self) -> str:
        return f"Timestamp({self.sec}, {self.nsec})"

    def __float__(self) -> float:
        return float(self.sec) + float(self.nsec) / 1e9

    def __eq__(self, other: object) -> bool:
        return isinstance(other, Timestamp) and self.sec == other.sec and self.nsec == other.nsec

    def __ne__(self, other: object) -> bool:
        return not self == other

    def __gt__(self, other: "Timestamp") -> bool:
        return self.nsec > other.nsec if self.sec == other.sec else self.sec > other.sec

    def __lt__(self, other: "Timestamp") -> bool:
        return self.nsec < other.nsec if self.sec == other.sec else self.sec < other.sec


# Timestamp and exemplar are optional.
# Value can be an int or a float.
# Timestamp can be a float containing a unixtime in seconds,
# a Timestamp object, or None.
# Exemplar can be an Exemplar object, or None.
class Exemplar(NamedTuple):
    labels: Dict[str, str]
    value: float
    timestamp: Optional[Union[float, Timestamp]] = None


class Sample(NamedTuple):
    name: str
    labels: Dict[str, str]
    value: float
    timestamp: Optional[Union[float, Timestamp]] = None
    exemplar: Optional[Exemplar] = None