"""Boilerplate redis cache adapter.

Store sales, transaction fields, and initial statement_detail_id.
"""
from redis import Redis

# from accounting import config


class CacheAdapter():
    """CacheAdapter class."""

    def __init__(self):
        """Create the adapter."""
        self._connection = self._get_connection()

    def _get_connection(self):
        """Mockable getter."""
        return Redis(unix_socket_path='/tmp/redis.sock')

    def __del__(self):
        """Teardown the connection."""
        if self._connection:
            del self._connection

    def cache_item(self, key, value):
        """Cache a value under key.

        Args:
            key (str|number): Cache key
            value (str|number): Value to cache
        """
        return self._connection.set(key, value)

    def get_item(self, key):
        """Return the value under key if it exists.

        Args:
            key (str|number): Cache key

        Returns:
            str|None: If found in cache, a string representation of the value
                else None.

        """
        return self._connection.get(key)

    def ping(self):
        """Perform a simple ping, ensuring the connection is active."""
        return self._connection.ping()

    def flushall(self):
        """Reset the cache completely."""
        return self._connection.flushall()