import subprocess
import datetime
import pathlib

root = pathlib.Path(__file__).resolve().parents[1]
template = root / "scripts" / "_version.py.in"
output = root / "sls" / "_version.py"

def get_commit():
    try:
        result_hash = subprocess.check_output(
            ["git", "describe", "--always", "--dirty", "--abbrev=7"],
            cwd=".",
            stderr=subprocess.DEVNULL,
            text=True
        ).strip()
        result_date = subprocess.check_output(
            ["git", "show", "-s", "--format=%ci"],
            cwd=".",
            stderr=subprocess.DEVNULL,
            text=True
        ).strip()
        return f"{result_hash} {result_date}"
    except Exception:
        return "unknown"

def get_timestamp():
    return datetime.datetime.now(datetime.timezone.utc).isoformat() + "Z"

def main():
    commit = get_commit()
    timestamp = get_timestamp()

    text = template.read_text()
    text = text.format(commit=commit, timestamp=timestamp)
    output.write_text(text)

if __name__ == "__main__":
    main()