#!/usr/bin/env python3
"""test_moon_composite.py — render a phase composite using real NASA data.

Simulates what moon_phase_monthly.py does on the night of a full moon:

  1. Fetch the NASA SVS Dial-a-Moon render for 2026-04-29T22:00Z.
  2. Load the east camera frame (21-07-00.jpg) and check for a clear moon.
  3. If clear: render — NASA moon with parallactic angle rotation → test_composite_out.jpg.
  4. If not clear: exit with a message (no fallback image).

Run from the sky-cam directory:

  python3 test_moon_composite.py

Requires internet access to reach svs.gsfc.nasa.gov.
"""

import pathlib
import sys
from datetime import datetime, timezone

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

EAST_FRAME = HERE / '21-07-00.jpg'
OUT_PATH   = HERE / 'test_composite_out.jpg'

# Obs time: 22:00 UTC on 2026-04-29 — aligns directly with NASA hourly renders.
NASA_FETCH_UTC = datetime(2026, 4, 29, 22, 0, tzinfo=timezone.utc)

MIN_QUALITY = 0.55


def main():
    if not EAST_FRAME.exists():
        print(f'ERROR: missing {EAST_FRAME}', file=sys.stderr)
        sys.exit(1)

    print('=== moon composite test ===')
    print(f'east frame : {EAST_FRAME.name}  (2026-04-29 21:07 UTC)')
    print(f'NASA time  : {NASA_FETCH_UTC.strftime("%Y-%m-%dT%H:00Z")}')
    print()

    # 1. Check east frame for clear moon detection
    print(f'checking moon in {EAST_FRAME.name} ...')
    try:
        from moon_detect import detect_moon
        det = detect_moon(str(EAST_FRAME))
        quality = det.quality if det is not None else None
    except Exception as e:
        print(f'  detection failed: {e}', file=sys.stderr)
        sys.exit(2)

    if quality is None or quality < MIN_QUALITY:
        print(f'  quality={quality} — no clear moon detection — skipping (no fallback)')
        sys.exit(0)

    print(f'  quality={quality:.3f} — clear shot confirmed')
    print()

    # 2. Fetch NASA Dial-a-Moon
    print(f'fetching NASA Dial-a-Moon for {NASA_FETCH_UTC.strftime("%Y-%m-%dT%H:00Z")} ...')
    try:
        import moon_dialamoon
        nasa_path = moon_dialamoon.fetch_for_time(NASA_FETCH_UTC)
        print(f'  cached at {nasa_path}')
    except Exception as e:
        print(f'  NASA fetch failed: {e}', file=sys.stderr)
        sys.exit(3)
    print()

    # 3. Render with parallactic angle rotation
    from moon_composite import render_phase_closeup
    caption = (
        f'Full Moon — April 2026 — '
        f'sky-cam east 2026-04-29 22:00 UTC — '
        f'NASA SVS Dial-a-Moon'
    )
    print(f'rendering {OUT_PATH.name} ...')
    render_phase_closeup(
        nasa_render_path=str(nasa_path),
        out_path=str(OUT_PATH),
        output_size=(1920, 1080),
        moon_height_pct=0.88,
        caption=caption,
        when_utc=NASA_FETCH_UTC,
    )
    print(f'done  ->  {OUT_PATH}')


if __name__ == '__main__':
    main()