"""数据库连接配置"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from config import DATABASE_URL

# 根据数据库类型配置引擎参数
if "sqlite" in DATABASE_URL:
    engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
else:
    engine = create_engine(
        DATABASE_URL,
        pool_size=10,
        max_overflow=20,
        pool_recycle=3600,
        pool_pre_ping=True,
    )

SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()


def get_db():
    """获取数据库会话的依赖注入"""
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()


def init_db():
    """初始化数据库，创建所有表"""
    Base.metadata.create_all(bind=engine)