"""Rebuild the static map twice a day, without serving it.

Use this when you host the generated output/ directory elsewhere (static hosting,
a CDN, GitHub Pages, etc.). To build *and* serve from one process — e.g. for a
container or local preview — run `python app.py` instead.

Usage:
    python scheduler.py          # build now, then rebuild at 07:00 and 19:00
    python scheduler.py --once   # build a single time and exit
"""
from __future__ import annotations

import argparse
import time
import traceback

import schedule

from build_map import generate

REFRESH_TIMES = ["07:00", "19:00"]


def safe_generate() -> None:
    try:
        generate()
    except Exception:
        print("Map generation failed:")
        traceback.print_exc()


def main() -> None:
    parser = argparse.ArgumentParser(description="Twice-daily fuel-price map rebuilder.")
    parser.add_argument("--once", action="store_true", help="build once and exit")
    args = parser.parse_args()

    safe_generate()  # always start with a fresh map
    if args.once:
        return

    for when in REFRESH_TIMES:
        schedule.every().day.at(when).do(safe_generate)
    print(f"Scheduled rebuilds at {', '.join(REFRESH_TIMES)} (local time).")
    while True:
        schedule.run_pending()
        time.sleep(30)


if __name__ == "__main__":
    main()