"""Cache module."""

from redis import Redis
from typing import Any, Optional
import json
import os

redis_host = os.getenv("REDIS_HOST", "redis")
redis_port = int(os.getenv("REDIS_PORT", "6379"))

redis_client = Redis(host=redis_host, port=redis_port, decode_responses=True)


def init_cache() -> None:
    """Initialize cache connection."""
    pass


def get(key: str) -> Optional[Any]:
    """Get value from cache."""
    value = redis_client.get(key)
    if value:
        return json.loads(value)
    return None


def set(key: str, value: Any, expire: Optional[int] = None) -> bool:
    """Set value in cache."""
    serialized = json.dumps(value)
    if expire:
        return redis_client.setex(key, expire, serialized)
    return redis_client.set(key, serialized)


def delete(key: str) -> bool:
    """Delete value from cache."""
    return redis_client.delete(key)


def clear() -> bool:
    """Clear all cache."""
    return redis_client.flushdb()