import re
from .lineage_model import EpochInfo


def parse_epoch(epoch_str: str) -> EpochInfo:
    epoch_str = str(epoch_str).strip().lower()

    match = re.match(r'v?(\d+)(?:\.(\d+))?(?:-([a-z]+))?', epoch_str)

    if match:
        major = int(match.group(1))
        minor = int(match.group(2)) if match.group(2) else 0
        stability = match.group(3) if match.group(3) else "stable"
    else:
        major = 1
        minor = 0
        stability = "stable"

    return EpochInfo(major=major, minor=minor, stability=stability)