import time
from typing import Any, Optional

class ManualCache:
    """
    Very simple in-memory TTL cache for the Manual MVP.
    Stores GET lists and details. Clears fully on any mutation.
    """
    def __init__(self, ttl_seconds: int = 300):
        self.ttl = ttl_seconds
        self._store = {}

    def get(self, key: str) -> Optional[Any]:
        item = self._store.get(key)
        if item is None:
            return None
        if time.time() > item["expires"]:
            del self._store[key]
            return None
        return item["value"]

    def set(self, key: str, value: Any):
        self._store[key] = {
            "value": value,
            "expires": time.time() + self.ttl
        }

    def clear(self):
        self._store.clear()

# Global singleton instance for the app
manual_cache = ManualCache(ttl_seconds=300)  # 5 min cache