"""Rebuild frontend/tests/fixtures/birth-sky-golden.json from the real engine.

Fictional sample from TASK-birth-sky-cover-20260928: 1994-05-18, UTC+8,
30.27N 120.15E, at four local times (one per sky phase). The frontend tests
read these engine responses as-is; the test suite never writes this file.

    python3 -m scripts.generate_birth_sky_golden
"""

from __future__ import annotations

import json
from pathlib import Path

from scripts.birth_sky import compute_birth_sky

ROOT = Path(__file__).resolve().parents[1]
GOLDEN = ROOT / "frontend" / "tests" / "fixtures" / "birth-sky-golden.json"
SAMPLE = {"date": "1994-05-18", "tz": 8, "lat": 30.27, "lon": 120.15}
TIMES = {"day": "07:40", "twilight_morning": "04:50", "twilight_evening": "19:10", "night": "00:00"}


def main() -> None:
    payload = {
        "source": "scripts/generate_birth_sky_golden.py -> scripts/birth_sky.compute_birth_sky (POST /api/birth_sky)",
        "note": "Fictional sample 1994-05-18 UTC+8 30.27N 120.15E; key = phase at that local time.",
        "times": TIMES,
        "responses": {
            key: compute_birth_sky(SAMPLE["date"], time, SAMPLE["tz"], SAMPLE["lat"], SAMPLE["lon"])
            for key, time in TIMES.items()
        },
    }
    GOLDEN.write_text(json.dumps(payload, ensure_ascii=False, separators=(",", ":")) + "\n", encoding="utf-8")
    print(f"wrote {GOLDEN}")


if __name__ == "__main__":
    main()