"""会话存档独立 poller → app-server 的内部信号端点(server→server, 非客户端接口)。

会话存档轮询在【独立进程】跑(WeWorkFinanceSdk 是 Go c-shared 库, 嵌进 app-server 会 segfault
把主进程带崩, 见 scripts/wx_finance_poller.py)。poller 拉到美团卡片/截图后 POST 到这里, 由
app-server 打比价信号 —— set_pending 在 app-server 进程内存, 心跳才 pop 得到, 故必须回到本进程。
靠共享密钥头 X-Internal-Secret(== settings.INTERNAL_API_SECRET)校验;未配置 → 503。
"""
from __future__ import annotations

import hmac
import logging
from typing import Annotated

from fastapi import APIRouter, Header, HTTPException, status

from app.core import wx_poc_signal
from app.core.config import settings
from app.schemas.wx_finance import WxFinancePendingIn, WxFinancePendingOut

logger = logging.getLogger("shagua.internal.wx_finance")

router = APIRouter(prefix="/internal", tags=["internal"])


def _check_secret(x_internal_secret: str | None) -> None:
    """共享密钥校验。未配置 → 503(挡裸奔);不匹配 → 401(常量时间比较)。"""
    configured = settings.INTERNAL_API_SECRET
    if not configured:
        raise HTTPException(
            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
            detail="internal api not configured",
        )
    if not x_internal_secret or not hmac.compare_digest(x_internal_secret, configured):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED, detail="invalid internal secret"
        )


@router.post(
    "/wx-finance/pending",
    response_model=WxFinancePendingOut,
    summary="会话存档 poller 触发比价信号(独立进程→app-server, 打 set_pending)",
)
def wx_finance_pending(
    payload: WxFinancePendingIn,
    x_internal_secret: Annotated[str | None, Header()] = None,
) -> WxFinancePendingOut:
    _check_secret(x_internal_secret)
    device_id = settings.WX_POC_TEST_DEVICE_ID
    if not device_id:
        logger.warning("wx_finance pending: WX_POC_TEST_DEVICE_ID 未配置, 忽略信号")
        return WxFinancePendingOut(ok=False)
    wx_poc_signal.set_pending(device_id, payload.source)
    logger.info(
        "wx_finance PoC: 已给测试设备 %s 打比价信号 source=%s (触发=%s)",
        device_id, payload.source, payload.kind,
    )
    return WxFinancePendingOut(ok=True)