"""Regenerate/verify the firmware mirror of the packaged JSON map."""
from pathlib import Path
import argparse
import sys
root = Path(__file__).resolve().parents[3]
sys.path.insert(0, str(root / 'python'))
from set_devices.gas_logger import load_map, c_header

parser = argparse.ArgumentParser()
parser.add_argument('--check', action='store_true')
args = parser.parse_args()
target = root / 'c/gas-logger/ports/pm35/pm35_map.h'
expected = c_header(load_map())
if args.check:
    if not target.exists() or target.read_text(encoding='utf-8') != expected:
        raise SystemExit('pm35_map.h differs from JSON; run generate_map.py')
else:
    target.parent.mkdir(parents=True, exist_ok=True)
    target.write_text(expected, encoding='utf-8')