"""Let browser scripts run with plain python3 by switching to the repo's .venv."""
import os, pathlib, sys

ROOT = pathlib.Path(__file__).resolve().parent.parent

def ensure_playwright():
    try:
        import playwright
        return
    except ImportError:
        pass
    venv = ROOT / '.venv'
    py = venv / 'bin' / 'python'
    if py.exists() and pathlib.Path(sys.prefix).resolve() != venv.resolve():
        os.execv(str(py), [str(py), *sys.argv])
    sys.exit('Playwright is not installed; see Develop in README.md (uv venv .venv, '
             'then uv pip install --python .venv/bin/python -r requirements.txt, '
             'then .venv/bin/python -m playwright install chromium).')