"""
数据库基础配置
"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from contextlib import contextmanager
import logging

from app.core.config import settings

logger = logging.getLogger(__name__)

# 创建数据库引擎
engine = create_engine(
    settings.get_database_url,
    pool_pre_ping=True,
    pool_size=20,
    max_overflow=40,
    echo=settings.DEBUG,
)

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

# 创建基类
Base = declarative_base()


@contextmanager
def get_db():
    """获取数据库会话的上下文管理器"""
    db = SessionLocal()
    try:
        yield db
        db.commit()
    except Exception as e:
        db.rollback()
        logger.error(f"Database error: {e}")
        raise
    finally:
        db.close()


def init_db():
    """初始化数据库表"""
    from . import virtual_user, interaction, token_usage, system_config, ai_model, news_cache
    Base.metadata.create_all(bind=engine)
    logger.info("Database tables created successfully")