"""Keep unanswered US shipping questions outside legacy regional model knowledge."""

import re

from .db import connect
from .quote_intent import US,QUOTE_WORDS,parse_intent,is_followup
from .pricing import shipping_region


def answer_us_fallback(message,conv_id):
    if re.search(r'理赔|赔偿|索赔|破损|丢失|退件|投诉',message):return None
    if re.search(r'换个话题|另外问',message):return None
    from .quote_edits import clean_conditions
    current=clean_conditions(message)
    active=bool(US.search(current))
    if not active and shipping_region(current) is not None:return None
    if not active and conv_id:
        connection=connect()
        try:
            recent=connection.execute("SELECT content FROM messages WHERE conv_id=? AND role='user' ORDER BY id DESC LIMIT 10",(conv_id,)).fetchall()
        finally:connection.close()
        for (previous,) in recent:
            previous=clean_conditions(previous)
            if re.search(r'理赔|赔偿|破损|丢失|退件|投诉|查单|轨迹|签收|换个话题',previous):break
            if US.search(previous):active=True;break
            if shipping_region(previous) is not None:break
            parsed=parse_intent(previous,set())
            if not (QUOTE_WORDS.search(previous) or is_followup(previous,parsed)):break
    if not active:return None
    from .quote_data import load_book
    if not load_book():return {'t':'当前尚未包含可用的美国报价表，请提供目的地仓码或邮编及货物信息，联系人工确认。'}
    english=not re.search(r'[\u4e00-\u9fff]',message) and bool(re.search(r'[A-Za-z]{3,}',message))
    if english:
        return {'t':'Please specify the US route or destination warehouse/ZIP code and the point you want to confirm. Unlisted charges or service conditions require confirmation by customer support.'}
    return {'t':'请说明您想确认的美国渠道、目的仓码或邮编，以及具体的费用或发货要求；未明确的服务条件需要联系人工核对。'}