import os


class Defaults:
    # Flask-session specific settings
    SESSION_TYPE = "null"
    SESSION_KEY_PREFIX = "session:"
    SESSION_USE_SIGNER = False
    SESSION_PERMANENT = True
    SESSION_ID_LENGTH = 32
    SESSION_SERIALIZATION_FORMAT = "msgpack"

    # Clean up settings for non TTL backends (SQL, PostgreSQL, etc.)
    SESSION_CLEANUP_N_REQUESTS = None

    # Redis settings
    SESSION_REDIS = None

    # Memcached settings
    SESSION_MEMCACHED = None

    # CacheLib settings
    SESSION_CACHELIB = None

    # Filesystem settings
    # TODO: remove in 1.0
    SESSION_FILE_DIR = os.path.join(os.getcwd(), "flask_session")
    SESSION_FILE_THRESHOLD = 500
    SESSION_FILE_MODE = 384

    # MongoDB settings
    SESSION_MONGODB = None
    SESSION_MONGODB_DB = "flask_session"
    SESSION_MONGODB_COLLECT = "sessions"

    # SQLAlchemy settings
    SESSION_SQLALCHEMY = None
    SESSION_SQLALCHEMY_TABLE = "sessions"
    SESSION_SQLALCHEMY_SEQUENCE = None
    SESSION_SQLALCHEMY_SCHEMA = None
    SESSION_SQLALCHEMY_BIND_KEY = None

    # DynamoDB settings
    SESSION_DYNAMODB = None
    SESSION_DYNAMODB_TABLE = "Sessions"