"""
隐藏式商品/类型归属商家端类型：点单写入订单抢单字段时使用。
"""
from shangpin.models import ShangpinLeixing


def parse_guishu_leixing_id(raw, shenhezhuangtai=None):
    """
    解析归属商家端类型 ID。
    非隐藏式(4)一律视为无归属；有值时必须指向 shenhezhuangtai=3 的类型。
    返回 (guishu_leixing_id|None, error_message|None)
    """
    try:
        status = int(shenhezhuangtai) if shenhezhuangtai is not None else None
    except (TypeError, ValueError):
        status = None
    if status is not None and status != 4:
        return None, None

    if raw is None or raw == '' or str(raw).lower() in ('null', 'none', 'undefined'):
        return None, None
    try:
        gid = int(raw)
    except (TypeError, ValueError):
        return None, '归属商家端类型ID无效'
    if gid <= 0:
        return None, None
    if not ShangpinLeixing.objects.filter(id=gid, shenhezhuangtai=3).exists():
        return None, '归属类型必须是商家端商品类型（审核状态=3）'
    return gid, None


def resolve_order_qiangdan_fields(shangpin):
    """
    点单写入 Dingdan 的抢单相关字段：
    - 商品或所属类型配置了 guishu_leixing_id → 用该商家端类型的 id/yaoqiuleixing/huiyuan_id/yongjin
    - 否则沿用商品自身字段
    """
    guishu_id = getattr(shangpin, 'guishu_leixing_id', None)
    if not guishu_id and getattr(shangpin, 'leixing_id', None):
        own_type = ShangpinLeixing.objects.filter(id=shangpin.leixing_id).only(
            'guishu_leixing_id',
        ).first()
        if own_type:
            guishu_id = own_type.guishu_leixing_id

    if guishu_id:
        merchant = ShangpinLeixing.objects.filter(id=guishu_id, shenhezhuangtai=3).first()
        if merchant:
            return {
                'leixing_id': merchant.id,
                'yaoqiuleixing': merchant.yaoqiuleixing,
                'huiyuan_id': merchant.huiyuan_id or '',
                'yongjin': merchant.yongjin if merchant.yongjin is not None else 0,
            }

    return {
        'leixing_id': shangpin.leixing_id,
        'yaoqiuleixing': getattr(shangpin, 'yaoqiuleixing', None),
        'huiyuan_id': getattr(shangpin, 'huiyuan_id', '') or '',
        'yongjin': getattr(shangpin, 'yongjin', 0) or 0,
    }