"""
企微通知服务

封装企业微信 API，发送告警文本卡片。
V1 使用应用消息 + 文本卡片，后期扩展为模板卡片。
"""

import httpx
import time
from typing import Optional, List

from app.utils.logger import logger


class WeChatService:
    """企微通知服务（单例）"""

    def __init__(self):
        self._enabled = False
        self._corp_id = ""
        self._agent_id = ""
        self._secret = ""
        self._token = ""
        self._encoding_aes_key = ""
        self._access_token = ""
        self._token_expire_at = 0

    def init(self, config):
        """初始化企微配置"""
        self._enabled = config.enabled and bool(config.corp_id) and bool(config.secret)
        self._corp_id = config.corp_id
        self._agent_id = config.agent_id
        self._secret = config.secret
        self._token = config.token
        self._encoding_aes_key = config.encoding_aes_key

        if self._enabled:
            logger.info(f"企微通知服务已启用: corp_id={self._corp_id}")
        else:
            logger.info("企微通知服务未启用")

    @property
    def enabled(self) -> bool:
        return self._enabled

    async def _get_access_token(self) -> str:
        """获取企微 access_token（带缓存）"""
        if self._access_token and time.time() < self._token_expire_at - 60:
            return self._access_token

        url = "https://qyapi.weixin.qq.com/cgi-bin/gettoken"
        params = {"corpid": self._corp_id, "corpsecret": self._secret}

        async with httpx.AsyncClient(timeout=10) as client:
            resp = await client.get(url, params=params)
            data = resp.json()

        if data.get("errcode") != 0:
            raise Exception(f"获取 access_token 失败: {data}")

        self._access_token = data["access_token"]
        self._token_expire_at = time.time() + data.get("expires_in", 7200)
        logger.info("企微 access_token 已更新")
        return self._access_token

    async def send_alarm_card(
        self,
        user_ids: List[str],
        alarm_id: str,
        alarm_type: str,
        area_name: str,
        camera_name: str,
        description: str,
        snapshot_url: str,
        event_time: str,
        alarm_level: int = 2,
        service_base_url: str = "",
    ) -> bool:
        """
        发送告警文本卡片

        Args:
            user_ids: 企微 userid 列表
            alarm_id: 告警ID
            alarm_type: 告警类型
            area_name: 区域名称
            camera_name: 摄像头名称
            description: VLM 生成的场景描述
            snapshot_url: 截图 URL
            event_time: 告警时间
            alarm_level: 告警级别

        Returns:
            是否发送成功
        """
        if not self._enabled:
            logger.debug("企微未启用，跳过发送")
            return False

        try:
            access_token = await self._get_access_token()

            # 告警类型中文映射
            type_names = {
                "leave_post": "人员离岗",
                "intrusion": "周界入侵",
            }
            type_name = type_names.get(alarm_type, alarm_type)

            # 告警级别映射
            level_names = {1: "提醒", 2: "一般", 3: "严重", 4: "紧急"}
            level_name = level_names.get(alarm_level, "一般")

            # 构造文本卡片消息
            content = (
                f"<div class=\"highlight\">{level_name} | {type_name}</div>\n"
                f"<div class=\"gray\">区域：{area_name}</div>\n"
                f"<div class=\"gray\">摄像头：{camera_name}</div>\n"
                f"<div class=\"gray\">时间：{event_time}</div>\n"
                f"<div class=\"normal\">{description}</div>"
            )

            # H5 详情页 URL（企微卡片"查看详情"跳转目标）
            detail_url = f"{service_base_url}/static/alarm_detail.html?alarm_id={alarm_id}" if service_base_url else snapshot_url or "https://work.weixin.qq.com"

            msg = {
                "touser": "|".join(user_ids),
                "msgtype": "textcard",
                "agentid": int(self._agent_id) if self._agent_id else 0,
                "textcard": {
                    "title": f"【{level_name}】{type_name}告警",
                    "description": content,
                    "url": detail_url,
                    "btntxt": "查看详情",
                },
            }

            url = f"https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={access_token}"
            async with httpx.AsyncClient(timeout=10) as client:
                resp = await client.post(url, json=msg)
                data = resp.json()

            if data.get("errcode") != 0:
                logger.error(f"企微发送失败: {data}")
                return False

            logger.info(f"企微通知已发送: alarm={alarm_id}, users={user_ids}")
            return True

        except Exception as e:
            logger.error(f"企微发送异常: {e}")
            return False

    async def send_text_message(self, user_id: str, content: str) -> bool:
        """发送文本消息给指定用户"""
        if not self._enabled:
            return False
        try:
            access_token = await self._get_access_token()
            msg = {
                "touser": user_id,
                "msgtype": "text",
                "agentid": int(self._agent_id) if self._agent_id else 0,
                "text": {"content": content},
            }
            url = f"https://qyapi.weixin.qq.com/cgi-bin/message/send?access_token={access_token}"
            async with httpx.AsyncClient(timeout=10) as client:
                resp = await client.post(url, json=msg)
                data = resp.json()
            if data.get("errcode") != 0:
                logger.error(f"企微文本消息发送失败: {data}")
                return False
            logger.info(f"企微文本消息已发送: user={user_id}")
            return True
        except Exception as e:
            logger.error(f"发送文本消息异常: {e}")
            return False

# 全局单例
_wechat_service: Optional[WeChatService] = None


def get_wechat_service() -> WeChatService:
    global _wechat_service
    if _wechat_service is None:
        _wechat_service = WeChatService()
    return _wechat_service