# Upsert折扣明细：对比old_discount和discount，不同才更新
# 参数: discountid, productid, discount, old_discount, detail_id(可选)

result = {'widgettype': 'Message', 'options': {'title': 'Error', 'message': 'Invalid', 'type': 'error', 'timeout': 3}}

try:
    discountid = params_kw.get('discountid')
    productid = params_kw.get('productid')
    discount_val = params_kw.get('discount')
    old_discount = params_kw.get('old_discount')
    detail_id = params_kw.get('detail_id')

    if not discountid or not productid:
        raise Exception('缺少必要参数: discountid, productid')

    # 过滤 NaN 和空值
    if discount_val is not None:
        s = str(discount_val).strip().lower()
        if s in ('', 'nan', 'none', 'null'):
            discount_val = None

    if old_discount is not None:
        s = str(old_discount).strip().lower()
        if s in ('', 'nan', 'none', 'null'):
            old_discount = None

    # 对比新旧值，相同则跳过
    if discount_val is not None and old_discount is not None:
        try:
            if float(discount_val) == float(old_discount):
                result = {'widgettype': 'Message', 'options': {'title': 'Success', 'message': '折扣未变化', 'type': 'success', 'timeout': 3}}
                return result
        except:
            pass

    user_orgid = await get_userorgid()
    dbname = get_module_dbname('discount')

    # discount为0或空时，如果已有记录则删除
    if not discount_val or float(discount_val) == 0:
        if detail_id:
            async with DBPools().sqlorContext(dbname) as sor:
                await sor.D('discount_detail', {'id': detail_id})
            result = {'widgettype': 'Message', 'options': {'title': 'Success', 'message': '折扣已清除', 'type': 'success', 'timeout': 3}}
        else:
            result = {'widgettype': 'Message', 'options': {'title': 'Success', 'message': 'ok', 'type': 'success', 'timeout': 3}}
        return result

    async with DBPools().sqlorContext(dbname) as sor:
        if detail_id:
            await sor.U('discount_detail', {
                'id': detail_id,
                'discount': float(discount_val)
            })
        else:
            await sor.C('discount_detail', {
                'id': getID(),
                'discountid': discountid,
                'resellerid': user_orgid,
                'prodtypeid': None,
                'productid': productid,
                'discount': float(discount_val)
            })

    result = {'widgettype': 'Message', 'options': {'title': 'Success', 'message': '折扣保存成功', 'type': 'success', 'timeout': 3}}

except Exception as e:
    debug(f'save_discount error: {format_exc()}')
    result['options'] = {'title': 'Error', 'message': f'保存失败: {str(e)}', 'type': 'error', 'timeout': 5}

return result