"""趋势策略开仓逻辑，对应 Go 版本的 ``logic/open.go``。"""

from __future__ import annotations

import logging
from datetime import datetime

from libs import calc_buy_volume
from sdk import OP_BUY

from .order import PlaceOrderRequest
from .state import STATUS_ING, StateItem


def open_signal(run, ticks, open_signals) -> None:
    """逐个验证开仓信号并提交买入委托。"""
    for item in open_signals:
        # 1. 验证信号配置允许开仓的时间区间。
        signal_config = run.global_cfg.signals.get(item.signal_key)
        if signal_config is None or not check_timezone(signal_config.timezone):
            continue

        # 2. 检查该证券是否已有买入委托锁，防止重复下单。
        if run.orders.busy(item.code,"BUY"):
            continue

        # 3. 验证行情和最新价格是否有效。
        tick = ticks.get(item.code)
        price = tick.last_price if tick is not None else 0
        if price <= 0:
            continue

        # 4. 等待价格从观察低点反弹，防止直接接下跌中的“飞刀”。
        if not run.open_watch.triggered("开仓", item.code, price):
            continue

        # 5. 根据单笔买入金额计算整手开仓数量。
        volume = calc_buy_volume(price, run.account_cfg.buy_value)
        if volume <= 0:
            continue

        # 6. 生成本地订单号并按最新价提交开仓委托。
        order_id = run.orders.new_order_id("base")
        request = PlaceOrderRequest(
            run.client,
            OP_BUY,
            item.code,
            volume,
            order_id,
            item.signal_key,
        )
        if not run.orders.place(request):
            continue

        # 7. 保存底仓订单、数量、成本和处理中状态。
        run.state.set(
            StateItem(
                code=item.code,
                base_order_id=order_id,
                base_qty=volume,
                base_cost=price,
                base_status=STATUS_ING,
            )
        )
        try:
            run.state.save()
        except OSError:
            logging.exception("[状态] %s 开仓状态保存失败", item.code)
        run.open_watch.forget(item.code)
        logging.info("[ZT][开仓] %s 买入 %d 股", item.code, volume)


def check_timezone(timezone: str, now: datetime | None = None) -> bool:
    """验证当前时间是否处于配置区间。

    ``*`` 表示全天允许；多个区间用逗号分隔，例如
    ``9:30-10:30,13:30-14:30``。同时支持跨午夜区间。
    """
    timezone = str(timezone or "").strip()
    if timezone == "*":
        return True

    current = now or datetime.now()
    current_minutes = current.hour * 60 + current.minute

    for section in timezone.split(","):
        bounds = section.strip().split("-")
        if len(bounds) != 2:
            continue
        start = _parse_minutes(bounds[0])
        end = _parse_minutes(bounds[1])
        if start is None or end is None:
            continue

        if start <= end and start <= current_minutes <= end:
            return True
        if start > end and (current_minutes >= start or current_minutes <= end):
            return True

    return False


def _parse_minutes(value: str) -> int | None:
    """把 ``时:分`` 转换为当天分钟数，无效值返回 None。"""
    try:
        hour_text, minute_text = value.strip().split(":")
        hour, minute = int(hour_text), int(minute_text)
    except (TypeError, ValueError):
        return None
    if not 0 <= hour <= 23 or not 0 <= minute <= 59:
        return None
    return hour * 60 + minute