# services/cache.py
import os, json, time, sqlite3, threading

_DB_PATH = os.path.join(os.path.dirname(__file__), "..", "newsintel_cache.sqlite")
_LOCK = threading.Lock()

def _connect():
    os.makedirs(os.path.dirname(_DB_PATH), exist_ok=True)
    conn = sqlite3.connect(_DB_PATH)
    conn.execute("""
        CREATE TABLE IF NOT EXISTS cache (
            cache_key TEXT PRIMARY KEY,
            ts REAL NOT NULL,
            payload TEXT NOT NULL
        )
    """)
    return conn

def _key_for(*parts):
    return "|".join(str(p).strip().lower() for p in parts)

def get_cache(*key_parts, max_age_sec=86400):
    """Return cached JSON (as dict) if not expired; else None."""
    key = _key_for(*key_parts)
    with _LOCK:
        conn = _connect()
        try:
            row = conn.execute("SELECT ts, payload FROM cache WHERE cache_key=?", (key,)).fetchone()
            if not row:
                return None
            ts, payload = row
            if (time.time() - ts) > max_age_sec:
                return None
            return json.loads(payload)
        finally:
            conn.close()

def set_cache(payload_obj, *key_parts):
    key = _key_for(*key_parts)
    blob = json.dumps(payload_obj, ensure_ascii=False)
    with _LOCK:
        conn = _connect()
        try:
            conn.execute(
                "REPLACE INTO cache (cache_key, ts, payload) VALUES (?, ?, ?)",
                (key, time.time(), blob)
            )
            conn.commit()
        finally:
            conn.close()