"""
Database connection and session utilities
"""

from contextlib import contextmanager
from typing import Annotated, Generator
from sqlalchemy import create_engine, StaticPool, Connection
from sqlalchemy.orm import sessionmaker, Session

from fastapi import Depends

from src.constants import Environment
from src.config import SQLALCHEMY_DATABASE_URI, settings as global_settings

if global_settings.ENVIRONMENT == Environment.TESTING:
    connect_args = {"check_same_thread": False}
    engine = create_engine(
        SQLALCHEMY_DATABASE_URI.get_secret_value(),
        connect_args=connect_args,
        poolclass=StaticPool,
    )
else:
    engine = create_engine(
        SQLALCHEMY_DATABASE_URI.get_secret_value(),
        pool_size=global_settings.DATABASE_POOL_SIZE,
        pool_recycle=global_settings.DATABASE_POOL_TTL,
        pool_pre_ping=global_settings.DATABASE_POOL_PRE_PING,
    )


sm = sessionmaker(autocommit=False, expire_on_commit=False, bind=engine)


@contextmanager
def get_db_connection() -> Generator[Connection, None, None]:
    with engine.connect() as connection:
        try:
            yield connection
        except Exception:
            connection.rollback()
            raise


def _get_db_connection() -> Generator[Connection, None, None]:
    with get_db_connection() as connection:
        yield connection


DbConnection = Annotated[Connection, Depends(_get_db_connection)]


@contextmanager
def get_db_session() -> Generator[Session, None, None]:
    session = sm()
    try:
        yield session
    except Exception:
        session.rollback()
        raise
    finally:
        session.close()


def _get_db_session() -> Generator[Session, None, None]:
    with get_db_session() as session:
        yield session


DbSession = Annotated[Session, Depends(_get_db_session)]