"""TimeReading 데이터클래스"""

from dataclasses import dataclass
from datetime import datetime


@dataclass
class TimeReading:
    """시간 읽기 결과"""
    controller_mac: str
    controller_label: str
    pc_time: datetime
    controller_time: datetime
    drift_seconds: float

    @property
    def drift_display(self) -> str:
        """오차 표시용 문자열"""
        sign = "+" if self.drift_seconds >= 0 else ""
        return f"{sign}{self.drift_seconds:.1f}초"