"""Build time sanity checks — earliest/latest reasonable system clock values.

Ported from net.i2p.time.BuildTime.
"""

import time
from datetime import datetime, timezone


# Hardcoded earliest reasonable time (update periodically)
_EARLIEST_STR = "2025-05-26 12:00:00"
_EARLIEST_LONG_MS = 1748217600 * 1000  # fallback if parse fails
_YEARS_25_MS = 25 * 365 * 24 * 60 * 60 * 1000


def _parse_earliest() -> int:
    """Parse the earliest reasonable time string, return ms since epoch."""
    try:
        dt = datetime.strptime(_EARLIEST_STR, "%Y-%m-%d %H:%M:%S").replace(
            tzinfo=timezone.utc
        )
        return int(dt.timestamp() * 1000)
    except (ValueError, OverflowError):
        return _EARLIEST_LONG_MS


_earliest_time = _parse_earliest()
_latest_time = _earliest_time + _YEARS_25_MS
# In Python context, we don't read JAR manifests — build time = earliest
_build_time = _earliest_time


class BuildTime:
    """Get build date sanity bounds for clock validation.

    In the Python port, we don't read JAR manifests, so build_time
    defaults to the hardcoded earliest time.
    """

    @staticmethod
    def get_build_time() -> int:
        """Return build time in milliseconds since epoch."""
        return _build_time

    @staticmethod
    def get_earliest_time() -> int:
        """Return the earliest reasonable time in ms since epoch."""
        return _earliest_time

    @staticmethod
    def get_latest_time() -> int:
        """Return the latest reasonable time in ms since epoch."""
        return _latest_time