"""Infrastructure readiness distinct from lightweight process liveness.

Do not expose DB DSNs, Redis endpoints or filesystem paths in the public response.
Redis wake-ups are optional and are not a readiness requirement.
"""
from pathlib import Path
import tempfile
from . import db


def readiness() -> bool:
    try:
        # SELECT 1 works on SQLite and PostgreSQL and checks actual connectivity.
        with db.connect() as conn:
            if conn.execute('SELECT 1 AS ready').fetchone()[0] != 1:
                return False
        data=Path(db.DATA)
        data.mkdir(parents=True,exist_ok=True)
        # Build artifacts and job results require writable shared storage.
        with tempfile.NamedTemporaryFile(dir=data, prefix='.ready-', delete=True) as probe:
            probe.write(b'1')
            probe.flush()
        return True
    except Exception:
        return False