"""Audit log backed by SQLite."""
import sqlite3, time, json, os, threading
from pathlib import Path

_db = Path(os.environ.get("SU_AUDIT", "/data/audit.db"))
_local = threading.local()


def init():
    _db.parent.mkdir(parents=True, exist_ok=True)
    with _conn() as c:
        c.execute("""CREATE TABLE IF NOT EXISTS log(
            id INTEGER PRIMARY KEY, ts REAL,
            src TEXT, action TEXT, status TEXT,
            ref TEXT, detail TEXT, ip TEXT)""")


def _conn():
    if not hasattr(_local, "c") or _local.c is None:
        _local.c = sqlite3.connect(str(_db), timeout=5)
        _local.c.row_factory = sqlite3.Row
    return _local.c


def log(src: str, action: str, status="ok", ref="", detail=None, ip=""):
    d = json.dumps(detail) if isinstance(detail, (dict, list)) else str(detail or "")
    try:
        with _conn() as c:
            c.execute("INSERT INTO log(ts,src,action,status,ref,detail,ip) VALUES(?,?,?,?,?,?,?)",
                      (time.time(), src, action, status, ref, d, ip))
    except Exception:
        pass


def query(limit=100, offset=0) -> list[dict]:
    try:
        with _conn() as c:
            rows = c.execute("SELECT * FROM log ORDER BY ts DESC LIMIT ? OFFSET ?",
                             (limit, offset)).fetchall()
        return [dict(r) for r in rows]
    except Exception:
        return []


def count() -> int:
    try:
        with _conn() as c:
            return c.execute("SELECT count(*) FROM log").fetchone()[0]
    except Exception:
        return 0


def clear():
    try:
        with _conn() as c:
            c.execute("DELETE FROM log")
    except Exception:
        pass