#!/usr/bin/env python3
"""
数据库迁移脚本：为 sales_orders 表添加时间字段
"""
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:
        # 检查列是否存在
        check_sql = """
        SELECT column_name 
        FROM information_schema.columns 
        WHERE table_name = 'sales_orders' 
        AND column_name = 'manufacturing_date'
        """
        result = await conn.execute(text(check_sql))
        if result.scalar():
            print("列 manufacturing_date 已存在，跳过迁移")
        else:
            # 添加新列
            alter_sql = """
            ALTER TABLE sales_orders 
            ADD COLUMN manufacturing_date TIMESTAMP,
            ADD COLUMN actual_delivery_date TIMESTAMP,
            ADD COLUMN actual_payment_date TIMESTAMP
            """
            await conn.execute(text(alter_sql))
            print("成功添加时间字段到 sales_orders 表")
    
    await engine.dispose()
    print("迁移完成")


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