import os
from datetime import datetime
from sqlalchemy import Column, Integer, Float, BigInteger, String, DateTime
from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
from sqlalchemy.orm import sessionmaker, declarative_base

# 从环境变量获取数据库连接 URL
DB_URL = os.getenv("DB_URL")

# 初始化 SQLAlchemy 基础类
Base = declarative_base()

class Record(Base):
    __tablename__ = 'records'

    id = Column(Integer, primary_key=True)
    user_id = Column(BigInteger, index=True)      # 区分不同用户
    amount = Column(Float, nullable=False)        # 花了多少钱
    category = Column(String(100))                # 属于什么类别
    transaction_time = Column(DateTime, default=datetime.now)  # 在那个时间

# 创建异步引擎
engine = create_async_engine(DB_URL, echo=False)

# 创建异步会话工厂
AsyncSessionLocal = sessionmaker(
    engine, class_=AsyncSession, expire_on_commit=False
)

# 初始化数据库表
async def init_db():
    async with engine.begin() as conn:
        # 如果表不存在则创建
        await conn.run_sync(Base.metadata.create_all)