"""Redis 异步后端 —— 基于 redis-py (aioredis)

状态：未实现。init() 会抛出 NotImplementedError。
"""

import logging
from typing import Any, Optional

from supply.infra.database.ports import KvBackend

logger = logging.getLogger(__name__)


class RedisBackend(KvBackend):
    """Redis 异步 KV 后端"""

    def __init__(self, name: str, config: Any):
        super().__init__(name, config)
        self._client = None

    # ==================== 生命周期 ====================

    async def init(self) -> None:
        raise NotImplementedError(
            "RedisBackend 尚未实现。需要安装 redis-py 并完成异步连接初始化逻辑。"
        )

    async def close(self) -> None:
        if self._client is not None:
            self._client = None
        self._initialized = False

    async def health(self) -> bool:
        return False

    # ==================== KV 操作 ====================

    async def get(self, key: str) -> Optional[str]:
        raise NotImplementedError("RedisBackend 尚未实现")

    async def set(
        self,
        key: str,
        value: str,
        ttl: Optional[int] = None,
    ) -> bool:
        raise NotImplementedError("RedisBackend 尚未实现")

    async def delete(self, *keys: str) -> int:
        raise NotImplementedError("RedisBackend 尚未实现")

    async def exists(self, *keys: str) -> int:
        raise NotImplementedError("RedisBackend 尚未实现")

    # ==================== 扩展操作 ====================

    async def expire(self, key: str, ttl: int) -> bool:
        """设置键过期时间（秒）"""
        raise NotImplementedError("RedisBackend 尚未实现")

    async def ttl(self, key: str) -> int:
        """获取键剩余 TTL（秒），-1 永不过期，-2 不存在"""
        raise NotImplementedError("RedisBackend 尚未实现")