"""Simple TTL-based in-memory cache for API responses."""

import time as _time

_cache_store: dict[str, tuple[float, dict]] = {}
CACHE_TTL = 300  # 5 minutes default


def cache_get(key: str) -> dict | None:
    """Get value from cache if within TTL."""
    entry = _cache_store.get(key)
    if entry and _time.time() - entry[0] < CACHE_TTL:
        return entry[1]
    if entry:
        del _cache_store[key]
    return None


def cache_set(key: str, data: dict) -> None:
    """Set value in cache."""
    _cache_store[key] = (_time.time(), data)


def cache_key(symbol: str, prefix: str = "stock-catalysts") -> str:
    """Generate a namespaced cache key for a symbol."""
    return f"{prefix}:{symbol.upper()}"