#!/usr/bin/env python3
"""
数据库迁移脚本：将采购订单的预计到货日期字段从 TIMESTAMP 改为 DATE 类型
"""
import asyncio
import sys
from pathlib import Path

project_root = Path(__file__).parent
sys.path.insert(0, str(project_root))
sys.path.insert(0, str(project_root / "src"))

from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy import text
from config.settings import settings


async def migrate():
    """执行数据库迁移"""
    if not settings.DATABASE_URL:
        print("错误：未配置数据库连接")
        return
    
    engine = create_async_engine(
        settings.DATABASE_URL,
        echo=True
    )
    
    async with engine.begin() as conn:
        # 修改日期字段类型
        alter_sql = """
        ALTER TABLE purchase_orders 
        ALTER COLUMN expected_date TYPE DATE
        """
        await conn.execute(text(alter_sql))
        print("成功将采购订单的预计到货日期字段类型改为 DATE")
    
    await engine.dispose()
    print("迁移完成")


if __name__ == "__main__":
    asyncio.run(migrate())