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"""Data model for the tzif library."""
from collections import namedtuple
from dataclasses import dataclass
from typing import Optional
from .tz_rule import Rule
@dataclass
class Transition:
"""An individual item in the Datablock."""
transition_time: int
"""A transition time at which the rules for computing local time may change."""
utoff: int
"""Number of seconds added to UTC to determine local time."""
dst: bool
"""Determines if local time is Daylight Savings Time (else Standard time)."""
isstdcnt: bool
"""Determines if the transition time is standard time (else, wall clock time)."""
isutccnt: bool
"""Determines if the transition time is UTC time, else is a local time."""
designation: str
"""A designation string."""
LeapSecond = namedtuple("LeapSecond", ["occurrence", "correction"])
"""A correction that needs to be applied to UTC in order to determine TAI.
The occurrence is the time at which the leap-second correction occurs.
The correction is the value of LEAPCORR on or after the occurrence (1 or -1).
"""
@dataclass
class TimezoneInfo:
"""The results of parsing the TZif file."""
transitions: list[Transition]
"""Local time changes."""
leap_seconds: list[LeapSecond]
rule: Optional[Rule] = None
"""A rule for computing local time changes after the last transition."""
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