#!/usr/bin/env python3
import json, time

result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid', 'type': 'error'}}

try:
    dbname = get_module_dbname('product_management')
    now = time.strftime('%Y-%m-%d %H:%M:%S')
    
    data = dict(params_kw)
    record_id = data.pop('id', None)
    if not record_id:
        raise ValueError('Missing id')
    
    data['updated_at'] = now
    
    # If category_id changed, update product_table_name from new category
    if data.get('category_id') and not data.get('product_table_name'):
        sql = """SELECT product_table_name FROM product_category 
                 WHERE id = ${category_id}$ AND has_product='1'"""
        async with DBPools().sqlorContext(dbname) as sor:
            rows = await sor.sqlExe(sql, {'category_id': data['category_id']})
            if rows:
                data['product_table_name'] = rows[0]['product_table_name']
    
    async with DBPools().sqlorContext(dbname) as sor:
        await sor.U('product', data, {'id': record_id})
    
    result = {'widgettype': 'Message', 'options': {'title': 'Success', 'message': '产品更新成功', 'type': 'success'}}

except Exception as e:
    result['options'] = {'title': 'Error', 'message': '更新失败: ' + str(e), 'type': 'error'}

return json.dumps(result, ensure_ascii=False)