import uuid
import json
import os


def make_session_id():
    return str(uuid.uuid4())


_LOG_DIR = "/data/logs"


def log_record(record):
    """Append-only: write a single JSON file to /data/logs (bucket-mounted storage). Never raises."""
    try:
        os.makedirs(_LOG_DIR, exist_ok=True)
        session_id = record.get("session_id", "unknown")
        ts = record.get("timestamp", "ts")
        ts_safe = ts.replace(":", "-").replace(".", "-").replace("+", "")
        filename = os.path.join(_LOG_DIR, f"{session_id}_{ts_safe}.json")
        with open(filename, "w", encoding="utf-8") as f:
            json.dump(record, f, ensure_ascii=False)
        print(f"[logging] Saved {filename}")
    except Exception as e:
        print(f"[logging] Save failed (non-fatal): {e}")