"""
飞书渠道 FastAPI 路由。

``FeishuChannelApi`` 以类方法作为路由处理器，依赖通过构造函数注入，
避免闭包捕获 channel_manager 的写法，也使各处理方法可独立测试。
"""

from __future__ import annotations

import logging
from typing import Any

from fastapi import APIRouter, HTTPException, Request

from gateway.core.channels.feishu.manager import FeishuChannelManager

logger = logging.getLogger(__name__)


class FeishuChannelApi:
    """飞书渠道 HTTP 路由：持有 manager 引用，以方法作为路由处理器。

    实现 ``ChannelPlugin`` Protocol，由 ``load_enabled_channels`` 自动挂载路由。
    """

    def __init__(self, channel_manager: FeishuChannelManager) -> None:
        self._manager = channel_manager

    @classmethod
    def from_env(cls) -> FeishuChannelApi:
        """从环境变量构造实例，供 ``load_enabled_channels`` 调用。"""
        return cls(FeishuChannelManager.from_env())

    async def inbound_webhook(self, request: Request) -> dict[str, Any]:
        """POST /api/channels/feishu/inbound/webhook

        Feishu HTTP 适配服务经 ``GATEWAY_FEISHU_WEBHOOK_URL`` 转发规范化 JSON 到此端点。
        """
        try:
            body = await request.json()
        except Exception:
            raise HTTPException(status_code=400, detail="invalid_json")

        if not isinstance(body, dict):
            raise HTTPException(status_code=400, detail="body_must_be_object")

        result = await self._manager.handle_feishu_inbound_webhook(body)
        if not result.ok and result.error:
            logger.warning("feishu inbound webhook error: %s", result.error)

        out: dict[str, Any] = {
            "ok": result.ok,
            "skipped": result.skipped,
            "reason": result.reason,
            "trace_id": result.trace_id,
            "task_id": result.task_id,
            "user_id": result.user_id,
            "workspace_id": result.workspace_id,
        }
        if result.error:
            out["error"] = result.error
        return out

    async def channel_status(self, channel_id: str) -> dict[str, Any]:
        """GET /api/channels/{channel_id}/status"""
        return self._manager.get_channel_status(channel_id)

    def build_router(self) -> APIRouter:
        """返回挂载好路由的 ``/api/channels`` APIRouter。"""
        channels = APIRouter(prefix="/api/channels", tags=["channels"])
        feishu = APIRouter(prefix="/feishu", tags=["feishu"])

        feishu.add_api_route(
            "/inbound/webhook",
            self.inbound_webhook,
            methods=["POST"],
        )
        channels.add_api_route(
            "/{channel_id}/status",
            self.channel_status,
            methods=["GET"],
        )
        channels.include_router(feishu)
        return channels