import json
import logging

import httpx

logger = logging.getLogger(__name__)

TEMPLATE_SEND_URL = "https://m.api.weibo.com/2/eps/template/send.json"


class WeiboTemplate:
    def __init__(self, gateway=None):
        self._gateway = gateway
        self._http: httpx.AsyncClient | None = None

    async def send(
        self,
        receiver_id: int,
        template_id: str,
        data: dict,
        *,
        url: str = "",
        topcolor: str = "#FF0000",
    ) -> dict | None:
        """
        发送模板消息。

        data 为模板变量的键值对，格式:
          {"first": {"value": "标题", "color": "#173177"}, "keyword1": {"value": "内容", "color": "#173177"}, ...}

        支持两种格式：
        - 纯文本模板：data 中的变量将替换文本中的 {{var.DATA}}
        - 卡片模板：自动生成结构化卡片形式
        """
        if self._http is None:
            self._http = httpx.AsyncClient(timeout=15.0)

        token = self._gateway.access_token if self._gateway else None
        if not token:
            logger.error("No access_token for template message")
            return None

        payload = {
            "access_token": token,
            "receiver_id": receiver_id,
            "template_id": template_id,
            "data": data,
        }
        if url:
            payload["url"] = url
        if topcolor:
            payload["topcolor"] = topcolor

        try:
            resp = await self._http.post(
                TEMPLATE_SEND_URL,
                data={"access_token": token, "json": json.dumps(payload, ensure_ascii=False)},
            )
            data = resp.json()
            if data.get("error_code"):
                logger.error("Template send failed: %s", data)
            return data
        except Exception:
            logger.exception("Template send error")
            return None

    async def close(self):
        if self._http:
            await self._http.aclose()
            self._http = None