"""数据库连接模块"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker, Session
from typing import Generator

from alcor.config import config


# 创建数据库引擎
engine = create_engine(
    config.database_url,
    connect_args={"check_same_thread": False} if "sqlite" in config.database_url else {},
    pool_pre_ping=True,
    echo=config.debug
)

# 创建会话工厂
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# 创建基类
Base = declarative_base()


def get_db() -> Generator[Session, None, None]:
    """获取数据库会话的依赖项"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db() -> None:
    """初始化数据库，创建所有表"""
    Base.metadata.create_all(bind=engine)