"""趋势策略委托簿，对应 Go 客户端的 ``logic/order.go``。"""

from __future__ import annotations

import secrets
from dataclasses import dataclass
from datetime import datetime, timedelta
from threading import Lock
from cachelib import SimpleCache
import logging

import httpx
from sdk import Client,ORDER_SIDE_BY_OFFSET,APIError,OrderItem

# 表示委托仍在处理、可能继续成交的 QMT 状态。
BUSY_STATUSES = {"48", "49", "50", "51", "52", "55"}
COMPLETED_STATUSES = {"56"}
TRACKED_STATUSES = BUSY_STATUSES | COMPLETED_STATUSES
CANCELABLE_STATUSES = {"49", "50", "51", "52"}


@dataclass(frozen=True, slots=True)
class PlaceOrderRequest:
    """``OrderBook.place`` 提交委托所需的全部参数。"""
    op: int
    code: str
    volume: int
    order_id: str
    strategy_name: str
    kind: str = ""


class OrderBook:
    """线程安全的活动委托缓存。"""

    def __init__(self, lock_timeout_sec: int = 180, cancel_timeout_sec: float = 10) -> None:
        self.lock_timeout_sec = max(1, lock_timeout_sec)
        self.cancel_timeout_sec = timedelta(seconds=cancel_timeout_sec)
        self.data: list[OrderItem] = []
        self.busy_keys: set[str] = set()
        self.busy_cache = SimpleCache(threshold=10_000, default_timeout=self.lock_timeout_sec)
        self.mutex = Lock()

    @staticmethod
    def new_order_id() -> str:
        """生成 ``trend-xxxxxxxx`` 格式的本地订单号。"""
        return f"trend-{secrets.token_hex(12)}"

    def busy(self, code: str, side: str) -> bool:
        """判断证券是否存在仍在处理中的同方向委托。"""
        with self.mutex:
            key = self._busy_key(side, code)
            return key in self.busy_keys or self.busy_cache.has(key)

    @staticmethod
    def _busy_key(side: str, code: str) -> str:
        return f"{side}-{code}"

    def refresh(self, client: Client, orders: list[OrderItem]) -> None:
        """用账户快照刷新委托，并撤销超时的活动委托。"""
        current = datetime.now()
        data: list[OrderItem] = []
        busy_keys: set[str] = set()
        canceled = 0

        for item in orders:
            # 不处理状态不对的
            if item.status not in TRACKED_STATUSES:
                continue
            if item.status in BUSY_STATUSES:
                busy_keys.add(self._busy_key(item.side, item.code))
            # 清理过期的
            if (
                item.created_at is not None
                and item.status in CANCELABLE_STATUSES
                and current - item.created_at > self.cancel_timeout_sec
            ):
                client.cancel_by_id(item.id)
                canceled += 1
                logging.info("[Order] 超时撤单，代码=%s，方向=%s，柜台订单=%s", item.code, item.side, item.id)
                continue

            # 缓存本次有效订单
            data.append(item)

        with self.mutex:
            self.data = data
            self.busy_keys = busy_keys
        logging.info("[Order] 刷新完成，跟踪=%d，处理中=%d，撤销=%d", len(data), len(busy_keys), canceled)

    def place(self, client: Client, request: PlaceOrderRequest) -> bool:
        """按最新价提交委托，并立即写入本地方向锁。"""
        side = ORDER_SIDE_BY_OFFSET.get(str(request.op), "")
        if not side:
            logging.warning("[Order] 下单失败，代码=%s，原因=未知买卖方向(%s)", request.code, request.op)
            return False

        key = self._busy_key(side, request.code)
        with self.mutex:
            if key in self.busy_keys or self.busy_cache.has(key):
                logging.info("[Order] 跳过重复下单，代码=%s，方向=%s", request.code, side)
                return False
            self.busy_cache.set(key, True, timeout=self.lock_timeout_sec)

        try:
            result = client.passorder(
                op_type=request.op,
                stock_code=request.code,
                volume=request.volume,
                strategy_name=request.strategy_name,
                order_id=request.order_id,
            )
        except APIError as exc:
            logging.exception("[Order] 下单失败，代码=%s，本地订单=%s，HTTP状态=%d，错误=%s", request.code, request.order_id, exc.status_code, exc.message or str(exc))
            return False
        except (httpx.RequestError, ValueError):
            # 响应异常不能证明柜台未受理，保留缓存防重，不自动重试。
            logging.exception("[Order] 下单请求或响应异常，代码=%s，本地订单=%s", request.code, request.order_id)
            return False
        
        logging.info("[Order] 下单已受理，代码=%s，方向=%s，数量=%d，本地订单=%s，返回=%s", request.code, side, request.volume, request.order_id, result)
        return True