"""企业微信 API 调用：超时与重试，配置来自环境变量。"""
import logging
from typing import Any

import httpx

from app.config import settings

logger = logging.getLogger(__name__)
TIMEOUT = settings.wecom_api_timeout
RETRIES = settings.wecom_api_retries
BASE = settings.wecom_api_base.rstrip("/")


async def _request(method: str, path: str, **kwargs: Any) -> dict | None:
    url = f"{BASE}{path}"
    for attempt in range(RETRIES + 1):
        try:
            async with httpx.AsyncClient(timeout=TIMEOUT) as client:
                r = await client.request(method, url, **kwargs)
                r.raise_for_status()
                return r.json()
        except Exception as e:
            logger.warning("wecom api attempt %s failed: %s", attempt + 1, e)
            if attempt == RETRIES:
                raise
    return None


async def get_access_token() -> str:
    """获取 corpid + secret 的 access_token。"""
    r = await _request(
        "GET",
        "/cgi-bin/gettoken",
        params={"corpid": settings.wecom_corp_id, "corpsecret": settings.wecom_secret},
    )
    if not r or r.get("errcode") != 0:
        raise RuntimeError(r.get("errmsg", "get token failed"))
    return r["access_token"]


async def send_text_to_external(external_user_id: str, content: str) -> None:
    """发送文本消息给外部联系人（客户联系-发送消息到客户）。"""
    token = await get_access_token()
    body = {
        "touser": [external_user_id],
        "sender": settings.wecom_agent_id,
        "msgtype": "text",
        "text": {"content": content},
    }
    # 企业微信文档：发送消息到客户 send_message_to_user
    r = await _request("POST", f"/cgi-bin/externalcontact/send_message_to_user?access_token={token}", json=body)
    if not r or r.get("errcode") != 0:
        raise RuntimeError(r.get("errmsg", "send failed"))