"""
Independent database connection module to prevent circular imports.
"""
import logging
from sqlalchemy import create_engine
from app.config import settings

# Use local logger to avoid importing app.log (which might create cycles)
log = logging.getLogger(__name__)

db_uri = settings.SQLALCHEMY_DB_URI
engine = create_engine(
    url = db_uri,
    echo = False,
    pool_use_lifo = True,
    pool_pre_ping = True,
    pool_recycle = settings.DB['pool_recycle'],
    isolation_level = 'READ COMMITTED',
    connect_args = {'connect_timeout': settings.DB['connect_timeout']}
)

log.info('DB Connection initializing...')
db = None
try:
    db = engine.connect()
    log.info(f'Connected to database: {db_uri}')
except Exception:
    log.exception('Could not connect to database.')