"""策略共用委托簿。"""

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(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, order_prefix: str, lock_timeout_sec: int = 180, cancel_timeout_sec: float = 10
    ) -> None:
        self.order_prefix = order_prefix
        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()

    def new_order_id(self, side: str) -> str:
        """生成带策略前缀的本地订单号。"""
        return f"{self.order_prefix}-{side}-{secrets.token_hex(10)}"

    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.local_order_id.startswith(f"{self.order_prefix}-")
                and item.status in CANCELABLE_STATUSES
                and current - item.created_at > self.cancel_timeout_sec
            ):
                try:
                    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,
                    )
                except Exception:
                    logging.exception(
                        "[Order] 撤单失败，保留在途状态，订单=%s", item.id
                    )

            # 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