#!/usr/bin/env python3
"""test_last_full_moon.py — smoke-test moon_phase.py against the most recent full moon.

Exercises:
  - full_moons_in_range()        — phase detection
  - sun_events_in_range()        — sunrise/sunset almanac (requires bare topos, not earth+topos)
  - illumination() / altaz() / parallactic_angle()

Run from the sky-cam directory:

  python3 test_last_full_moon.py
"""

import sys
import pathlib
from datetime import datetime, timedelta, timezone

HERE = pathlib.Path(__file__).resolve().parent
sys.path.insert(0, str(HERE))

import moon_phase as mp


def main() -> int:
    now = datetime.now(timezone.utc)

    # Last full moon: search back up to 35 days
    candidates = mp.full_moons_in_range(now - timedelta(days=35), now)
    if not candidates:
        print("ERROR: no full moon found in the last 35 days", file=sys.stderr)
        return 1
    fm = candidates[-1]

    print(f"last full moon (UTC) : {fm.strftime('%Y-%m-%dT%H:%M:%SZ')}")
    print(f"local                : {mp._format_local(fm)}")

    # Moon stats at exact full moon moment
    illum = mp.illumination(fm)
    pa = mp.phase_angle(fm)
    alt, az = mp.altaz(fm)
    para = mp.parallactic_angle(fm)
    print(f"illumination         : {illum:.4f}  ({illum*100:.1f}%)")
    print(f"phase angle          : {pa:.2f}°  (0° = full)")
    print(f"altitude / azimuth   : {alt:.2f}° / {az:.2f}°")
    print(f"parallactic angle    : {para:.2f}°")
    print()

    # Sunrise/sunset for the 24-hour window around the full moon — exercises the fix
    day_start = fm.replace(hour=0, minute=0, second=0, microsecond=0)
    day_end = day_start + timedelta(days=1)
    events = mp.sun_events_in_range(day_start, day_end)
    if events:
        print(f"sun events on {day_start.strftime('%Y-%m-%d')} (UTC):")
        for t, is_rise in events:
            label = "sunrise" if is_rise else "sunset "
            print(f"  {label} {t.strftime('%H:%M:%S')} UTC  ({mp._format_local(t)})")
    else:
        print(f"no sun events found on {day_start.strftime('%Y-%m-%d')} (polar location?)")

    print()
    print("OK")
    return 0


if __name__ == "__main__":
    sys.exit(main())