"""
安保工单开放接口客户端

对接外部工单系统，支持：
- 创建工单：POST /open-api/ops/security/order/create
- 自动结单：POST /open-api/ops/security/order/auto-complete
- SHA256 签名认证
"""

import hashlib
import json
import time
import uuid
from typing import Optional

import httpx

from app.utils.logger import logger


class WorkOrderClient:
    """安保工单 API 客户端（单例）"""

    def __init__(self):
        self._enabled = False
        self._base_url = ""
        self._app_id = ""
        self._app_secret = ""
        self._timeout = 10

    def init(self, config):
        """初始化工单配置"""
        self._enabled = config.enabled and bool(config.base_url) and bool(config.app_secret)
        self._base_url = config.base_url.rstrip("/")
        self._app_id = config.app_id
        self._app_secret = config.app_secret
        self._timeout = getattr(config, "timeout", 10)

        if self._enabled:
            logger.info(f"工单客户端已启用: base_url={self._base_url}")
        else:
            logger.info("工单客户端未启用")

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

    def _sign(self, body_json: str, nonce: str, timestamp: str) -> str:
        """
        SHA256 签名

        签名算法：SHA256(body_json + "appId=" + appId + "&nonce=" + nonce + "&timestamp=" + timestamp + appSecret)
        """
        raw = (
            body_json
            + "appId=" + self._app_id
            + "&nonce=" + nonce
            + "&timestamp=" + timestamp
            + self._app_secret
        )
        return hashlib.sha256(raw.encode("utf-8")).hexdigest()

    def _build_headers(self, body_json: str) -> dict:
        """构造请求头（含签名）"""
        nonce = uuid.uuid4().hex[:16]
        timestamp = str(int(time.time() * 1000))
        sign = self._sign(body_json, nonce, timestamp)

        return {
            "Content-Type": "application/json",
            "appId": self._app_id,
            "nonce": nonce,
            "timestamp": timestamp,
            "sign": sign,
        }

    async def create_order(
        self,
        title: str,
        area_id: int,
        alarm_id: str,
        alarm_type: str,
    ) -> Optional[str]:
        """
        创建安保工单

        Returns:
            orderId 字符串，失败返回 None
        """
        if not self._enabled:
            logger.debug("工单客户端未启用，跳过创建")
            return None

        body = {
            "title": title,
            "areaId": area_id,
            "alarmId": alarm_id,
            "alarmType": alarm_type,
        }
        body_json = json.dumps(body, ensure_ascii=False, separators=(",", ":"))

        try:
            headers = self._build_headers(body_json)
            url = f"{self._base_url}/open-api/ops/security/order/create"

            async with httpx.AsyncClient(timeout=self._timeout) as client:
                resp = await client.post(url, content=body_json, headers=headers)
                data = resp.json()

            if data.get("code") != 0:
                logger.error(f"创建工单失败: {data}")
                return None

            # API 返回 {"code":0, "data": 1234567890} — data 直接是 orderId
            order_id = str(data.get("data", ""))
            logger.info(f"工单已创建: orderId={order_id}, alarmId={alarm_id}")
            return order_id

        except Exception as e:
            logger.error(f"创建工单异常: {e}")
            return None

    async def auto_complete_order(
        self,
        order_id: str,
        remark: str = "",
    ) -> bool:
        """
        自动结单

        Returns:
            是否成功
        """
        if not self._enabled:
            return False

        body = {
            "orderId": int(order_id) if order_id else 0,
            "remark": remark,
        }
        body_json = json.dumps(body, ensure_ascii=False, separators=(",", ":"))

        try:
            headers = self._build_headers(body_json)
            url = f"{self._base_url}/open-api/ops/security/order/auto-complete"

            async with httpx.AsyncClient(timeout=self._timeout) as client:
                resp = await client.post(url, content=body_json, headers=headers)
                data = resp.json()

            if data.get("code") != 0:
                logger.error(f"自动结单失败: orderId={order_id}, resp={data}")
                return False

            logger.info(f"工单已自动结单: orderId={order_id}")
            return True

        except Exception as e:
            logger.error(f"自动结单异常: orderId={order_id}, error={e}")
            return False


# 全局单例
_work_order_client: Optional[WorkOrderClient] = None


def get_work_order_client() -> WorkOrderClient:
    global _work_order_client
    if _work_order_client is None:
        _work_order_client = WorkOrderClient()
    return _work_order_client