"""中控振幅统计:OKX 指数(可降级永续)按时段切窗,点数口径.

仅只读行情;不触及下单链路.
"""
from __future__ import annotations

import csv
import io
import statistics
import time
from datetime import date, datetime, timedelta
from typing import Any, Callable, Optional
from zoneinfo import ZoneInfo

import httpx

APP_TZ = ZoneInfo("Asia/Shanghai")
END_HOUR = 16
EXCHANGE = "okx"
TIMEFRAME = "1H"

SYMBOLS: dict[str, dict[str, str]] = {
    "eth": {
        "label": "ETH",
        "index_inst": "ETH-USD",
        "swap_inst": "ETH-USDT-SWAP",
    },
    "btc": {
        "label": "BTC",
        "index_inst": "BTC-USD",
        "swap_inst": "BTC-USDT-SWAP",
    },
}

PERIOD_DAYS: dict[str, int] = {
    "1m": 30,
    "2m": 60,
    "3m": 90,
    "6m": 180,
    "1y": 365,
}

OKX_INDEX_CANDLES = "https://www.okx.com/api/v5/market/index-candles"
OKX_HISTORY_INDEX_CANDLES = "https://www.okx.com/api/v5/market/history-index-candles"
OKX_SWAP_CANDLES = "https://www.okx.com/api/v5/market/candles"
OKX_HISTORY_SWAP_CANDLES = "https://www.okx.com/api/v5/market/history-candles"


def normalize_symbol(raw: str) -> str:
    s = (raw or "").strip().lower()
    if s in ("eth", "ethereum"):
        return "eth"
    if s in ("btc", "bitcoin"):
        return "btc"
    raise ValueError("symbol 仅支持 eth / btc")


def resolve_sample_days(period: str, custom_days: Any = None) -> int:
    p = (period or "2m").strip().lower()
    if p == "custom":
        try:
            n = int(custom_days)
        except (TypeError, ValueError):
            raise ValueError("自定义天数无效") from None
        return max(7, min(400, n))
    if p not in PERIOD_DAYS:
        raise ValueError("周期无效")
    return PERIOD_DAYS[p]


def window_bounds_for_settlement(
    settlement: date,
    start_hour: int,
    *,
    span_days: int = 1,
) -> tuple[datetime, datetime]:
    """返回 [start, end) 的本地时刻;end 为结算日 16:00.

    span_days=1: 与现口径相同(如 26日16:00→27日16:00)
    span_days=2: 再往前推 1 天(如 25日16:00→27日16:00)
    """
    if not (0 <= int(start_hour) <= 23):
        raise ValueError("起点须为 0-23 整点")
    span = max(1, int(span_days or 1))
    end = datetime(settlement.year, settlement.month, settlement.day, END_HOUR, 0, 0, tzinfo=APP_TZ)
    sh = int(start_hour)
    if sh >= END_HOUR:
        prev = settlement - timedelta(days=1)
        start = datetime(prev.year, prev.month, prev.day, sh, 0, 0, tzinfo=APP_TZ)
    else:
        start = datetime(settlement.year, settlement.month, settlement.day, sh, 0, 0, tzinfo=APP_TZ)
    if span > 1:
        start = start - timedelta(days=span - 1)
    return start, end


def list_settlement_dates(*, sample_days: int, now: Optional[datetime] = None) -> list[date]:
    """最近 sample_days 个已收窗结算日(不含进行中的今天未到 16:00)."""
    now = now or datetime.now(APP_TZ)
    if now.tzinfo is None:
        now = now.replace(tzinfo=APP_TZ)
    else:
        now = now.astimezone(APP_TZ)
    today = now.date()
    today_end = datetime(today.year, today.month, today.day, END_HOUR, 0, 0, tzinfo=APP_TZ)
    latest = today if now >= today_end else today - timedelta(days=1)
    return [latest - timedelta(days=i) for i in range(int(sample_days))]


def _safe_float(v: Any) -> Optional[float]:
    try:
        if v is None or v == "":
            return None
        return float(v)
    except (TypeError, ValueError):
        return None


def bars_to_map(bars: list[dict[str, Any]]) -> dict[int, dict[str, float]]:
    """open_time_ms -> {o,h,l,c}."""
    m: dict[int, dict[str, float]] = {}
    for b in bars or []:
        if not isinstance(b, dict):
            continue
        ts = b.get("ts")
        if ts is None:
            ts = b.get("open_time_ms")
        try:
            ts_i = int(ts)
        except (TypeError, ValueError):
            continue
        o = _safe_float(b.get("o") if "o" in b else b.get("open"))
        h = _safe_float(b.get("h") if "h" in b else b.get("high"))
        l = _safe_float(b.get("l") if "l" in b else b.get("low"))
        c = _safe_float(b.get("c") if "c" in b else b.get("close"))
        if None in (o, h, l, c):
            continue
        m[ts_i] = {"o": float(o), "h": float(h), "l": float(l), "c": float(c)}
    return m


def _ohlc_window_metrics(
    start: datetime,
    end: datetime,
    bar_map: dict[int, dict[str, float]],
) -> Optional[dict[str, Any]]:
    """在 [start, end) 上算开高低收与开→高/开→低/振幅/涨跌."""
    start_ms = int(start.timestamp() * 1000)
    # 1H 棒覆盖 [T, T+1h);窗终点 16:00 用 15:00 棒的 close
    last_bar_ms = int((end - timedelta(hours=1)).timestamp() * 1000)
    if start_ms not in bar_map or last_bar_ms not in bar_map:
        return None
    opens = bar_map[start_ms]["o"]
    close = bar_map[last_bar_ms]["c"]
    hi = bar_map[start_ms]["h"]
    lo = bar_map[start_ms]["l"]
    t = start_ms
    while t <= last_bar_ms:
        b = bar_map.get(t)
        if b:
            hi = max(hi, b["h"])
            lo = min(lo, b["l"])
        t += 3600 * 1000
    up = hi - opens
    down = opens - lo
    amp = hi - lo
    change = close - opens
    return {
        "window_start": start.strftime("%Y-%m-%d %H:%M"),
        "window_end": end.strftime("%Y-%m-%d %H:%M"),
        "open": round(opens, 4),
        "high": round(hi, 4),
        "low": round(lo, 4),
        "close": round(close, 4),
        "up_points": round(up, 4),
        "down_points": round(down, 4),
        "amplitude": round(amp, 4),
        "change": round(change, 4),
    }


def compute_day_row(
    settlement: date,
    start_hour: int,
    bar_map: dict[int, dict[str, float]],
) -> Optional[dict[str, Any]]:
    start, end = window_bounds_for_settlement(settlement, start_hour, span_days=1)
    m1 = _ohlc_window_metrics(start, end, bar_map)
    if m1 is None:
        return None
    start2, end2 = window_bounds_for_settlement(settlement, start_hour, span_days=2)
    m2 = _ohlc_window_metrics(start2, end2, bar_map)
    wd = settlement.weekday()  # Mon=0 … Sun=6
    is_we = wd >= 5
    row: dict[str, Any] = {
        "settlement_day": settlement.isoformat(),
        "weekday": wd,
        "weekday_label": "六" if wd == 5 else ("日" if wd == 6 else ""),
        "is_weekend": is_we,
        **m1,
    }
    if m2 is None:
        row.update(
            {
                "window2_start": start2.strftime("%Y-%m-%d %H:%M"),
                "window2_end": end2.strftime("%Y-%m-%d %H:%M"),
                "open_2d": None,
                "high_2d": None,
                "low_2d": None,
                "close_2d": None,
                "up_points_2d": None,
                "down_points_2d": None,
                "amplitude_2d": None,
                "change_2d": None,
            }
        )
    else:
        row.update(
            {
                "window2_start": m2["window_start"],
                "window2_end": m2["window_end"],
                "open_2d": m2["open"],
                "high_2d": m2["high"],
                "low_2d": m2["low"],
                "close_2d": m2["close"],
                "up_points_2d": m2["up_points"],
                "down_points_2d": m2["down_points"],
                "amplitude_2d": m2["amplitude"],
                "change_2d": m2["change"],
            }
        )
    return row


def normalize_move_points(raw: Any) -> Optional[float]:
    """对照波动点数.空/≤0 表示不做点数达标对照."""
    if raw is None or raw == "":
        return None
    try:
        v = float(raw)
    except (TypeError, ValueError):
        raise ValueError("波动点数须为数字") from None
    if v <= 0:
        return None
    return v


def normalize_weekend_filter(raw: Any) -> str:
    """all | exclude | only;默认全部."""
    s = (str(raw) if raw is not None else "all").strip().lower()
    if s in ("", "all", "全部"):
        return "all"
    if s in ("exclude", "exclude_weekend", "no_weekend", "排除周末"):
        return "exclude"
    if s in ("only", "weekend_only", "only_weekend", "仅周末"):
        return "only"
    raise ValueError("周末筛选须为 all / exclude / only")


def filter_weekend_rows(rows: list[dict[str, Any]], weekend_filter: Any = "all") -> list[dict[str, Any]]:
    mode = normalize_weekend_filter(weekend_filter)
    if mode == "all":
        return list(rows or [])
    out: list[dict[str, Any]] = []
    for r in rows or []:
        is_we = bool(r.get("is_weekend"))
        if "is_weekend" not in r and r.get("settlement_day"):
            try:
                is_we = date.fromisoformat(str(r["settlement_day"])).weekday() >= 5
            except ValueError:
                is_we = False
        if mode == "exclude" and is_we:
            continue
        if mode == "only" and not is_we:
            continue
        out.append(r)
    return out


def _ensure_weekend_flags(item: dict[str, Any]) -> None:
    if "is_weekend" in item:
        return
    if not item.get("settlement_day"):
        item.setdefault("weekday_label", "")
        item.setdefault("is_weekend", False)
        return
    try:
        wd = date.fromisoformat(str(item["settlement_day"])).weekday()
        item["weekday"] = wd
        item["weekday_label"] = "六" if wd == 5 else ("日" if wd == 6 else "")
        item["is_weekend"] = wd >= 5
    except ValueError:
        item.setdefault("weekday_label", "")
        item.setdefault("is_weekend", False)


def enrich_rows(
    rows: list[dict[str, Any]],
    *,
    move_points: Any = None,
) -> list[dict[str, Any]]:
    """为日表附加周末标注,以及相对波动点数的两边达标."""
    mp = normalize_move_points(move_points)
    out: list[dict[str, Any]] = []
    for r in rows or []:
        item = dict(r)
        _ensure_weekend_flags(item)
        up = float(item.get("up_points") or 0)
        down = float(item.get("down_points") or 0)
        amp = float(item.get("amplitude") or 0)
        hit_up = bool(mp is not None and up >= mp)
        hit_down = bool(mp is not None and down >= mp)
        amp_hit = bool(mp is not None and amp >= mp)
        amp2 = item.get("amplitude_2d")
        amp2_v = float(amp2) if amp2 is not None and amp2 != "" else None
        amp_hit_2d = bool(mp is not None and amp2_v is not None and amp2_v >= mp)
        item["move_points"] = mp
        item["hit_up"] = hit_up
        item["hit_down"] = hit_down
        item["hit_either"] = hit_up or hit_down
        item["hit_both"] = hit_up and hit_down
        item["amp_hit"] = amp_hit
        item["amp_hit_2d"] = amp_hit_2d
        out.append(item)
    return out


# 兼容旧调用名
def enrich_rows_pnl(rows: list[dict[str, Any]], **kwargs: Any) -> list[dict[str, Any]]:
    return enrich_rows(rows, move_points=kwargs.get("move_points"))


def move_points_stats(rows: list[dict[str, Any]], move_points: float) -> dict[str, Any]:
    """波动点数达标汇总:开→高/开→低两边."""
    mp = float(move_points)
    if mp <= 0:
        raise ValueError("波动点数须 > 0")
    work = enrich_rows(rows, move_points=mp)
    n = len(work)
    empty = {
        "move_points": round(mp, 4),
        "sample_count": n,
        "up_hit_days": 0,
        "up_hit_ratio": None,
        "down_hit_days": 0,
        "down_hit_ratio": None,
        "either_hit_days": 0,
        "either_hit_ratio": None,
        "both_hit_days": 0,
        "both_hit_ratio": None,
        "amp_hit_days": 0,
        "amp_hit_ratio": None,
        "amp_2d_hit_days": 0,
        "amp_2d_hit_ratio": None,
        "abs_change_hit_days": 0,
        "abs_change_hit_ratio": None,
    }
    if n <= 0:
        return empty
    up_hit = sum(1 for r in work if r.get("hit_up"))
    down_hit = sum(1 for r in work if r.get("hit_down"))
    either = sum(1 for r in work if r.get("hit_either"))
    both = sum(1 for r in work if r.get("hit_both"))
    amp_hit = sum(1 for r in work if r.get("amp_hit"))
    amp2_rows = [r for r in work if r.get("amplitude_2d") is not None]
    amp2_hit = sum(1 for r in work if r.get("amp_hit_2d"))
    n2 = len(amp2_rows)
    abs_hit = sum(1 for r in work if abs(float(r.get("change") or 0)) >= mp)
    empty.update(
        {
            "up_hit_days": up_hit,
            "up_hit_ratio": round(up_hit / n, 4),
            "down_hit_days": down_hit,
            "down_hit_ratio": round(down_hit / n, 4),
            "either_hit_days": either,
            "either_hit_ratio": round(either / n, 4),
            "both_hit_days": both,
            "both_hit_ratio": round(both / n, 4),
            "amp_hit_days": amp_hit,
            "amp_hit_ratio": round(amp_hit / n, 4),
            "amp_2d_hit_days": amp2_hit,
            "amp_2d_hit_ratio": round(amp2_hit / n2, 4) if n2 else None,
            "abs_change_hit_days": abs_hit,
            "abs_change_hit_ratio": round(abs_hit / n, 4),
        }
    )
    return empty


def summarize_rows(
    rows: list[dict[str, Any]],
    *,
    move_points: Any = None,
) -> dict[str, Any]:
    mp = normalize_move_points(move_points)
    empty_2d = {
        "max_amplitude_2d": None,
        "max_amplitude_2d_day": None,
        "avg_amplitude_2d": None,
        "median_amplitude_2d": None,
    }
    if not rows:
        out = {
            "sample_count": 0,
            "max_amplitude": None,
            "max_amplitude_day": None,
            "avg_amplitude": None,
            "median_amplitude": None,
            "max_up_points": None,
            "avg_up_points": None,
            "max_down_points": None,
            "avg_down_points": None,
            "up_day_ratio": None,
            "down_day_ratio": None,
            **empty_2d,
            "move_points_stats": None,
        }
        if mp is not None:
            out["move_points_stats"] = move_points_stats([], mp)
        return out
    amps = [float(r["amplitude"]) for r in rows]
    ups = [float(r["up_points"]) for r in rows]
    downs = [float(r["down_points"]) for r in rows]
    max_amp = max(amps)
    max_amp_day = next(r["settlement_day"] for r in rows if float(r["amplitude"]) == max_amp)
    up_days = sum(1 for r in rows if float(r["change"]) > 0)
    down_days = sum(1 for r in rows if float(r["change"]) < 0)
    n = len(rows)
    amps2 = [float(r["amplitude_2d"]) for r in rows if r.get("amplitude_2d") is not None]
    out: dict[str, Any] = {
        "sample_count": n,
        "max_amplitude": round(max_amp, 4),
        "max_amplitude_day": max_amp_day,
        "avg_amplitude": round(statistics.fmean(amps), 4),
        "median_amplitude": round(statistics.median(amps), 4),
        "max_up_points": round(max(ups), 4),
        "avg_up_points": round(statistics.fmean(ups), 4),
        "max_down_points": round(max(downs), 4),
        "avg_down_points": round(statistics.fmean(downs), 4),
        "up_day_ratio": round(up_days / n, 4),
        "down_day_ratio": round(down_days / n, 4),
        **empty_2d,
        "move_points_stats": None,
    }
    if amps2:
        max_a2 = max(amps2)
        out["max_amplitude_2d"] = round(max_a2, 4)
        out["max_amplitude_2d_day"] = next(
            r["settlement_day"] for r in rows if r.get("amplitude_2d") is not None and float(r["amplitude_2d"]) == max_a2
        )
        out["avg_amplitude_2d"] = round(statistics.fmean(amps2), 4)
        out["median_amplitude_2d"] = round(statistics.median(amps2), 4)
    if mp is not None:
        out["move_points_stats"] = move_points_stats(rows, mp)
    return out


def _parse_okx_candle_row(row: list) -> Optional[dict[str, Any]]:
    if not row or len(row) < 5:
        return None
    try:
        ts = int(row[0])
        o, h, l, c = float(row[1]), float(row[2]), float(row[3]), float(row[4])
    except (TypeError, ValueError, IndexError):
        return None
    return {"ts": ts, "o": o, "h": h, "l": l, "c": c}


def _okx_get_json(
    client: httpx.Client,
    url: str,
    params: dict[str, str],
    *,
    retries: int = 8,
) -> dict[str, Any]:
    """GET OKX 公共行情;遇 429 指数退避重试."""
    last_err: Optional[BaseException] = None
    for attempt in range(max(1, int(retries))):
        try:
            r = client.get(url, params=params)
            if r.status_code == 429:
                wait = min(12.0, 0.7 * (2**attempt))
                time.sleep(wait)
                last_err = httpx.HTTPStatusError(
                    f"429 Too Many Requests for url '{r.url}'",
                    request=r.request,
                    response=r,
                )
                continue
            r.raise_for_status()
            body = r.json()
            if not isinstance(body, dict):
                raise RuntimeError("OKX 返回非对象 JSON")
            return body
        except httpx.HTTPStatusError as exc:
            status = exc.response.status_code if exc.response is not None else None
            if status == 429 and attempt + 1 < retries:
                wait = min(12.0, 0.7 * (2**attempt))
                time.sleep(wait)
                last_err = exc
                continue
            raise
        except httpx.TransportError as exc:
            if attempt + 1 < retries:
                time.sleep(min(8.0, 0.5 * (2**attempt)))
                last_err = exc
                continue
            raise
    if last_err is not None:
        raise last_err
    raise RuntimeError("OKX 请求失败")


def fetch_okx_candles(
    *,
    url: str,
    inst_id: str,
    since_ms: int,
    until_ms: int,
    bar: str = "1H",
    client: Optional[httpx.Client] = None,
    timeout: float = 30.0,
    history_url: Optional[str] = None,
    max_pages: int = 200,
    page_pause_sec: float = 0.12,
    history_page_pause_sec: float = 0.22,
) -> list[dict[str, Any]]:
    """拉取 [since_ms, until_ms] 覆盖的 K 线(含边界).

    OKX 近期接口约仅 1440 根;更早需 history_* 端点续拉.
    分页带间隔,429 自动退避重试.
    """
    own = client is None
    client = client or httpx.Client(
        timeout=timeout,
        trust_env=False,
        headers={"User-Agent": "crypto_monitor-amp-stats/1.0"},
    )
    try:
        out: dict[int, dict[str, Any]] = {}
        after: Optional[str] = None
        active_url = url
        switched_history = False
        for page_i in range(max(20, int(max_pages))):
            if page_i > 0:
                pause = history_page_pause_sec if switched_history or "history" in active_url else page_pause_sec
                if pause > 0:
                    time.sleep(pause)
            params: dict[str, str] = {"instId": inst_id, "bar": bar, "limit": "100"}
            if after:
                params["after"] = after
            body = _okx_get_json(client, active_url, params)
            if str(body.get("code") or "") not in ("0", "0.0", ""):
                raise RuntimeError(body.get("msg") or f"OKX error {body.get('code')}")
            data = body.get("data") or []
            if not data:
                # 近期接口到头 → 切历史端点再试
                if history_url and not switched_history and after is not None:
                    active_url = history_url
                    switched_history = True
                    time.sleep(max(history_page_pause_sec, 0.35))
                    continue
                break
            oldest_ts = None
            for row in data:
                parsed = _parse_okx_candle_row(row)
                if not parsed:
                    continue
                ts = int(parsed["ts"])
                oldest_ts = ts if oldest_ts is None else min(oldest_ts, ts)
                if ts < since_ms - 3600 * 1000:
                    continue
                if ts > until_ms + 3600 * 1000:
                    continue
                out[ts] = parsed
            if oldest_ts is None:
                break
            if oldest_ts <= since_ms:
                break
            # 无新进度时避免死循环
            if after is not None and str(oldest_ts) == after:
                if history_url and not switched_history:
                    active_url = history_url
                    switched_history = True
                    time.sleep(max(history_page_pause_sec, 0.35))
                    continue
                break
            after = str(oldest_ts)
            # 近期接口返回变少且仍未覆盖 since → 切历史
            if (
                history_url
                and not switched_history
                and len(data) < 100
                and oldest_ts > since_ms
            ):
                active_url = history_url
                switched_history = True
                time.sleep(max(history_page_pause_sec, 0.35))
        return [out[k] for k in sorted(out.keys())]
    finally:
        if own:
            client.close()


def fetch_symbol_bars(
    symbol: str,
    *,
    since_ms: int,
    until_ms: int,
    fetch_fn: Optional[Callable[..., list[dict[str, Any]]]] = None,
) -> tuple[list[dict[str, Any]], str, str]:
    """返回 (bars, price_source_label, inst_id)."""
    key = normalize_symbol(symbol)
    meta = SYMBOLS[key]
    if fetch_fn:
        bars = fetch_fn(inst_id=meta["index_inst"], since_ms=since_ms, until_ms=until_ms)
        return bars, f"okx_index:{meta['index_inst']}", meta["index_inst"]

    index_err: Optional[BaseException] = None
    try:
        bars = fetch_okx_candles(
            url=OKX_INDEX_CANDLES,
            history_url=OKX_HISTORY_INDEX_CANDLES,
            inst_id=meta["index_inst"],
            since_ms=since_ms,
            until_ms=until_ms,
        )
        if bars:
            return bars, f"okx_index:{meta['index_inst']}", meta["index_inst"]
    except Exception as exc:
        index_err = exc
        # 指数侧已触发限频时先冷却,再降级永续,避免连环 429
        time.sleep(1.2)

    try:
        bars = fetch_okx_candles(
            url=OKX_SWAP_CANDLES,
            history_url=OKX_HISTORY_SWAP_CANDLES,
            inst_id=meta["swap_inst"],
            since_ms=since_ms,
            until_ms=until_ms,
        )
    except Exception as exc:
        detail = f"index={index_err}; swap={exc}" if index_err else str(exc)
        raise RuntimeError(f"OKX K线拉取失败({detail})") from exc
    if not bars:
        detail = f"index={index_err}" if index_err else "empty"
        raise RuntimeError(f"OKX 指数与永续 K 线均无数据({detail})")
    return bars, f"okx_swap:{meta['swap_inst']}", meta["swap_inst"]


def compute_amp_stats(
    *,
    symbol: str = "eth",
    start_hour: int = 16,
    period: str = "2m",
    custom_days: Any = None,
    move_points: Any = None,
    weekend_filter: Any = "all",
    now: Optional[datetime] = None,
    fetch_fn: Optional[Callable[..., list[dict[str, Any]]]] = None,
) -> dict[str, Any]:
    key = normalize_symbol(symbol)
    sh = int(start_hour)
    if sh < 0 or sh > 23:
        raise ValueError("起点须为 0-23 整点")
    mp = normalize_move_points(move_points)
    we_mode = normalize_weekend_filter(weekend_filter)
    sample_days = resolve_sample_days(period, custom_days)
    settlements = list_settlement_dates(sample_days=sample_days, now=now)
    if not settlements:
        raise RuntimeError("无可用结算日")
    # 最远窗起点(含两日振幅,多拉 1 天)
    oldest = settlements[-1]
    newest = settlements[0]
    start0, _ = window_bounds_for_settlement(oldest, sh, span_days=2)
    _, end1 = window_bounds_for_settlement(newest, sh, span_days=1)
    since_ms = int(start0.timestamp() * 1000)
    until_ms = int(end1.timestamp() * 1000)
    bars, price_source, inst_id = fetch_symbol_bars(
        key, since_ms=since_ms, until_ms=until_ms, fetch_fn=fetch_fn
    )
    bar_map = bars_to_map(bars)
    rows_all: list[dict[str, Any]] = []
    missing: list[str] = []
    for d in settlements:
        row = compute_day_row(d, sh, bar_map)
        if row is None:
            missing.append(d.isoformat())
            continue
        rows_all.append(row)
    return build_amp_result(
        rows_all=rows_all,
        symbol_key=key,
        start_hour=sh,
        period=period,
        sample_days=sample_days,
        move_points=mp,
        weekend_filter=we_mode,
        price_source=price_source,
        inst_id=inst_id,
        missing=missing,
    )


def build_amp_result(
    *,
    rows_all: list[dict[str, Any]],
    symbol_key: str,
    start_hour: int,
    period: str,
    sample_days: int,
    move_points: Any = None,
    weekend_filter: Any = "all",
    price_source: str = "",
    inst_id: str = "",
    missing: Optional[list[str]] = None,
) -> dict[str, Any]:
    mp = normalize_move_points(move_points)
    we_mode = normalize_weekend_filter(weekend_filter)
    filtered = filter_weekend_rows(rows_all, we_mode)
    rows = enrich_rows(filtered, move_points=mp)
    summary = summarize_rows(rows, move_points=mp)
    if period == "custom" or str(period).startswith("custom:"):
        period_label = period if str(period).startswith("custom:") else f"custom:{sample_days}"
    else:
        period_label = str(period)
    miss = missing or []
    return {
        "ok": True,
        "exchange": EXCHANGE,
        "symbol": symbol_key,
        "symbol_label": SYMBOLS[symbol_key]["label"],
        "start_hour": start_hour,
        "end_hour": END_HOUR,
        "period": period_label,
        "sample_days_requested": sample_days,
        "move_points": mp,
        "weekend_filter": we_mode,
        "timeframe": TIMEFRAME,
        "price_source": price_source,
        "inst_id": inst_id,
        "timezone": "Asia/Shanghai",
        "rows_all": rows_all,
        "rows": rows,
        "summary": summary,
        "missing_days": miss[:30],
        "missing_count": len(miss),
    }


def reframe_amp_stats(
    *,
    rows_all: list[dict[str, Any]],
    symbol: str = "eth",
    start_hour: int = 16,
    period: str = "2m",
    sample_days: int = 60,
    move_points: Any = None,
    weekend_filter: Any = "all",
    price_source: str = "",
    inst_id: str = "",
    missing: Optional[list[str]] = None,
) -> dict[str, Any]:
    """已有日表上改周末/波动点数,不拉 K 线."""
    key = normalize_symbol(symbol)
    return build_amp_result(
        rows_all=list(rows_all or []),
        symbol_key=key,
        start_hour=int(start_hour),
        period=period,
        sample_days=int(sample_days or 60),
        move_points=move_points,
        weekend_filter=weekend_filter,
        price_source=price_source,
        inst_id=inst_id,
        missing=missing,
    )


def rows_page(rows: list[dict[str, Any]], *, page: int = 1, page_size: int = 20) -> dict[str, Any]:
    page = max(1, int(page or 1))
    page_size = max(5, min(100, int(page_size or 20)))
    total = len(rows)
    start = (page - 1) * page_size
    chunk = rows[start : start + page_size]
    return {
        "page": page,
        "page_size": page_size,
        "total": total,
        "total_pages": max(1, (total + page_size - 1) // page_size) if total else 1,
        "rows": chunk,
    }


def build_export_csv(payload: dict[str, Any]) -> str:
    buf = io.StringIO()
    # Excel 友好 BOM
    buf.write("\ufeff")
    w = csv.writer(buf)
    s = payload.get("summary") or {}
    w.writerow(["【统计摘要】"])
    w.writerow(["交易所", payload.get("exchange")])
    w.writerow(["标的", payload.get("symbol_label")])
    w.writerow(["价源", payload.get("price_source")])
    w.writerow(["起点整点", f"{payload.get('start_hour')}:00"])
    w.writerow(["终点", f"{payload.get('end_hour')}:00"])
    w.writerow(["周期", payload.get("period")])
    w.writerow(["周末筛选", payload.get("weekend_filter")])
    w.writerow(["样本数", s.get("sample_count")])
    w.writerow(["最大振幅", s.get("max_amplitude"), "日期", s.get("max_amplitude_day")])
    w.writerow(["振幅均值", s.get("avg_amplitude"), "中位数", s.get("median_amplitude")])
    w.writerow(["两日最大振幅", s.get("max_amplitude_2d"), "日期", s.get("max_amplitude_2d_day")])
    w.writerow(["两日振幅均值", s.get("avg_amplitude_2d"), "中位数", s.get("median_amplitude_2d")])
    w.writerow(["开→高最大", s.get("max_up_points"), "均值", s.get("avg_up_points")])
    w.writerow(["开→低最大", s.get("max_down_points"), "均值", s.get("avg_down_points")])
    w.writerow(["上涨窗占比", s.get("up_day_ratio"), "下跌窗占比", s.get("down_day_ratio")])
    mp = s.get("move_points_stats") or {}
    if mp:
        w.writerow([])
        w.writerow(["【波动点数·振幅占比】", mp.get("move_points")])
        w.writerow(["振幅≥点数天数", mp.get("amp_hit_days"), "占比", mp.get("amp_hit_ratio")])
        w.writerow(["两日振幅≥点数天数", mp.get("amp_2d_hit_days"), "占比", mp.get("amp_2d_hit_ratio")])
        w.writerow(["开→高≥点数天数", mp.get("up_hit_days"), "占比", mp.get("up_hit_ratio")])
        w.writerow(["开→低≥点数天数", mp.get("down_hit_days"), "占比", mp.get("down_hit_ratio")])
        w.writerow(["|涨跌|≥点数天数", mp.get("abs_change_hit_days"), "占比", mp.get("abs_change_hit_ratio")])
    w.writerow([])
    w.writerow(["【日表明细】"])
    w.writerow(
        [
            "结算日",
            "星期",
            "周末",
            "窗起点",
            "窗终点",
            "开盘",
            "最高",
            "最低",
            "收盘",
            "开→高",
            "开→低",
            "振幅",
            "涨跌值",
            "两日窗起点",
            "两日窗终点",
            "两日振幅",
            "两日开→高",
            "两日开→低",
            "对照点数",
            "振幅达标",
            "两日振幅达标",
        ]
    )
    for r in payload.get("rows") or []:
        w.writerow(
            [
                r.get("settlement_day"),
                r.get("weekday_label") or "",
                "是" if r.get("is_weekend") else "否",
                r.get("window_start"),
                r.get("window_end"),
                r.get("open"),
                r.get("high"),
                r.get("low"),
                r.get("close"),
                r.get("up_points"),
                r.get("down_points"),
                r.get("amplitude"),
                r.get("change"),
                r.get("window2_start"),
                r.get("window2_end"),
                r.get("amplitude_2d"),
                r.get("up_points_2d"),
                r.get("down_points_2d"),
                r.get("move_points") if r.get("move_points") is not None else "",
                "是" if r.get("amp_hit") else ("否" if r.get("move_points") is not None else ""),
                "是" if r.get("amp_hit_2d") else ("否" if r.get("move_points") is not None and r.get("amplitude_2d") is not None else ""),
            ]
        )
    return buf.getvalue()


def export_filename(payload: dict[str, Any]) -> str:
    sym = (payload.get("symbol") or "eth").lower()
    sh = int(payload.get("start_hour") or 16)
    period = str(payload.get("period") or "2m").replace(":", "")
    day = datetime.now(APP_TZ).strftime("%Y%m%d")
    return f"okx_{sym}_amp_{sh}to16_{period}_{day}.csv"