"""网关 HTTP 客户端：出站长轮询领任务、回报状态、续租、恢复领取

worker 与网关之间是出站单向通信。所有方法都包装成「成功 → data，失败 → 抛
AppError」的形式，runner 拿到 AppError 直接打日志或转报 needs_human。

请求与响应严格使用 shared.api 的 ApiResponse 信封；网关侧错误码（6xxx）原样上抛，
不在这里翻译。鉴权头从 settings.bearer_token 取，与抓取/交易服务共用同一份。

**不 import app.gateway**：worker 只看 HTTP 响应 JSON，本地用 LeaseTask 表达领到的
任务，与网关侧的 Pydantic 模型解耦。
"""
from __future__ import annotations

import logging
from typing import Any

import httpx

from app.shared.config import Settings
from app.shared.errors import AppError
from app.shared.proxy import httpx_client_options
from app.shared.task_state import OrderState, TaskStatus
from app.trading.worker.models import LeaseTask

logger = logging.getLogger(__name__)


class GatewayClient:
    """网关 HTTP 客户端

    一份 AsyncClient 实例贯穿 worker 整个生命周期，连接池由 httpx 管理。
    """

    def __init__(
        self, base_url: str, bearer_token: str, *, settings: Settings, timeout: float = 60.0
    ):
        # 末尾去斜杠，避免 base + "/api/..." 拼出双斜杠
        self._base_url = base_url.rstrip("/")
        self._client = httpx.AsyncClient(
            base_url=self._base_url,
            headers={"Authorization": f"Bearer {bearer_token}"},
            timeout=timeout,
            **httpx_client_options(settings, target_url=self._base_url),
        )

    async def aclose(self) -> None:
        await self._client.aclose()

    # ---- 基础封装 ----

    async def _request(self, method: str, path: str, **kwargs: Any) -> dict[str, Any]:
        """发起请求并解信封。失败（success=False）抛 AppError"""
        response = await self._client.request(method, path, **kwargs)
        try:
            body = response.json()
        except ValueError as exc:
            raise AppError(
                message=f"网关响应不是合法 JSON：HTTP {response.status_code}",
                code="GATEWAY_BAD_BODY",
                err_code=3001,
                retryable=True,
            ) from exc

        if not body.get("success"):
            raise AppError(
                message=body.get("msg", "网关返回失败"),
                code="GATEWAY_ERROR",
                err_code=int(body.get("code", 1500)),
                retryable=False,
                status_code=response.status_code,
            )
        return body

    # ---- 接口 ----

    async def lease(
        self, worker_id: str, *, wait: int = 30, site: str | None = None
    ) -> LeaseTask | None:
        """长轮询领取。无可领任务时返回 None"""
        params: dict[str, Any] = {"worker_id": worker_id, "wait": wait}
        if site:
            params["site"] = site
        body = await self._request("GET", "/api/orders/lease", params=params)
        data = body.get("data")
        if not data:
            return None
        return LeaseTask(
            task_id=data["task_id"],
            site=data["site"],
            intent=data.get("intent") or {},
            lease_expires_at=data.get("lease_expires_at", ""),
            lease_count=data.get("lease_count", 1),
            known_state=data.get("known_state"),
        )

    async def renew(self, task_id: str, worker_id: str) -> dict[str, Any]:
        """续租，返回网关响应里的 data 字段"""
        body = await self._request(
            "POST",
            f"/api/orders/{task_id}/renew",
            json={"worker_id": worker_id},
        )
        return body["data"]

    async def report(
        self,
        task_id: str,
        worker_id: str,
        *,
        state: OrderState,
        payable_yen: int | None = None,
        pay_deadline: str | None = None,
        site_order_id: str | None = None,
        evidence_ref: str | None = None,
        detail: str = "",
        terminal: bool = False,
        terminal_status: TaskStatus | None = None,
    ) -> dict[str, Any]:
        """回报状态，返回网关响应里的 data 字段"""
        payload: dict[str, Any] = {
            "worker_id": worker_id,
            "state": state.value,
            "payable_yen": payable_yen,
            "pay_deadline": pay_deadline,
            "site_order_id": site_order_id,
            "evidence_ref": evidence_ref,
            "detail": detail,
            "terminal": terminal,
        }
        if terminal_status is not None:
            payload["terminal_status"] = terminal_status.value
        body = await self._request("POST", f"/api/orders/{task_id}/report", json=payload)
        return body["data"]

    async def get_task(self, task_id: str) -> dict[str, Any]:
        """任务详情，返回网关响应里的 data 字段（含 created_at）

        供 verify.verify_on_site 恢复核对用：LeaseTask（lease/reclaim 的响应）
        不带 created_at，规格 §5「按创建时间 ~ stale 之间」的窗口核对必须单独
        查一次这个接口才能拿到。
        """
        body = await self._request("GET", f"/api/orders/{task_id}")
        return body["data"]

    async def reclaim(self, task_id: str, worker_id: str) -> LeaseTask:
        """恢复领取。返回的 LeaseTask 必然 lease_count > 1"""
        body = await self._request(
            "POST",
            f"/api/orders/{task_id}/reclaim",
            json={"worker_id": worker_id},
        )
        data = body["data"]
        return LeaseTask(
            task_id=data["task_id"],
            site=data["site"],
            intent=data.get("intent") or {},
            lease_expires_at=data.get("lease_expires_at", ""),
            lease_count=data.get("lease_count", 1),
            known_state=data.get("known_state"),
        )