from server.GameBoard import GameBoard
import inspect
import pickle

class RedisGameBoardStore:
  def __init__(self, redis_url:str="redis://localhost:6379/0", key_prefix:str="snake:gameboard", ttl_seconds:int=900, **kwargs):
    self.redis_url = redis_url
    self.key_prefix = key_prefix
    self.ttl_seconds = max(60, int(ttl_seconds))
    self._redis = None

  async def _get_redis(self):
    if self._redis is not None:
      return self._redis

    try:
      import redis.asyncio as aioredis  # type: ignore[import-not-found]
    except ImportError as error:  # pragma: no cover
      raise RuntimeError("Redis backend selected but 'redis' package with asyncio support is not installed") from error

    self._redis = aioredis.from_url(self.redis_url)
    return self._redis

  def _key(self, game_id:str) -> str:
    return f"{self.key_prefix}:{game_id}"

  async def save(self, game_id:str, game_board:GameBoard) -> None:
    redis = await self._get_redis()
    payload = pickle.dumps(game_board, protocol=pickle.HIGHEST_PROTOCOL)
    await redis.set(self._key(game_id), payload, ex=self.ttl_seconds)

  async def load(self, game_id:str):
    redis = await self._get_redis()
    payload = await redis.get(self._key(game_id))
    if payload is None:
      return None
    return pickle.loads(payload)

  async def delete(self, game_id:str) -> None:
    redis = await self._get_redis()
    await redis.delete(self._key(game_id))

  async def close(self) -> None:
    if self._redis is None:
      return

    aclose_method = getattr(self._redis, "aclose", None)
    if callable(aclose_method):
      maybe_result = aclose_method()
      if inspect.isawaitable(maybe_result):
        await maybe_result
    else:
      close_method = getattr(self._redis, "close", None)
      if callable(close_method):
        close_result = close_method()
        if inspect.isawaitable(close_result):
          await close_result

    self._redis = None