"""中控行情区：各实例 ccxt OHLCV 拉取（hub_bridge /api/hub/ohlcv 共用）。"""

from __future__ import annotations

import math
import time
from typing import Any, Callable, Optional

CHART_TIMEFRAMES = frozenset({"1m", "5m", "15m", "1h", "4h", "1d", "1w"})
DAILY_PLUS_TIMEFRAMES = frozenset({"1d", "1w"})

TIMEFRAME_MS: dict[str, int] = {
    "1m": 60_000,
    "5m": 5 * 60_000,
    "15m": 15 * 60_000,
    "1h": 60 * 60_000,
    "4h": 4 * 60 * 60_000,
    "1d": 24 * 60 * 60_000,
    "1w": 7 * 24 * 60 * 60_000,
}


def normalize_chart_timeframe(raw: str | None, default: str = "5m") -> str:
    tf = (raw or default).strip().lower()
    return tf if tf in CHART_TIMEFRAMES else default


def bar_limit_for_timeframe(timeframe: str) -> int:
    tf = normalize_chart_timeframe(timeframe)
    return 500 if tf in DAILY_PLUS_TIMEFRAMES else 1000


def last_closed_bar_open_ms(timeframe: str, now_ms: int | None = None) -> int:
    """上一根已收盘 K 的 open_time（毫秒 UTC）。"""
    tf = normalize_chart_timeframe(timeframe)
    period = TIMEFRAME_MS[tf]
    now = int(now_ms if now_ms is not None else time.time() * 1000)
    current_open = (now // period) * period
    return int(current_open - period)


def window_start_ms(timeframe: str, need: int, retention_days: int, now_ms: int | None = None) -> int:
    """本地库清理/读库窗口：不超过 retention_days。"""
    now = int(now_ms if now_ms is not None else time.time() * 1000)
    period = TIMEFRAME_MS[normalize_chart_timeframe(timeframe)]
    retention_cutoff = now - max(1, int(retention_days)) * 86400000
    want = now - max(1, int(need)) * period
    return max(retention_cutoff, want)


def chart_fetch_start_ms(timeframe: str, need: int, now_ms: int | None = None) -> int:
    """行情展示拉取起点：按 need 根回看（日线 500 / 日内 1000），不受 DB 保留天数限制。"""
    now = int(now_ms if now_ms is not None else time.time() * 1000)
    period = TIMEFRAME_MS[normalize_chart_timeframe(timeframe)]
    return max(0, now - max(1, int(need)) * period)


def price_tick_from_market(exchange, exchange_symbol: str) -> Optional[float]:
    try:
        markets = getattr(exchange, "markets", None) or {}
        m = markets.get(exchange_symbol) or {}
        prec = m.get("precision") or {}
        p = prec.get("price")
        if p is not None:
            p = float(p)
            if p > 0:
                return p
        info = m.get("info") or {}
        for key in ("tickSize", "price_increment", "order_price_round"):
            if info.get(key) not in (None, ""):
                try:
                    v = float(info[key])
                    if v > 0:
                        return v
                except (TypeError, ValueError):
                    pass
    except Exception:
        pass
    return None


def format_price_by_tick(value: Any, tick: Optional[float]) -> str:
    if value in (None, ""):
        return "-"
    try:
        v = float(value)
    except (TypeError, ValueError):
        return str(value)
    if v == 0:
        return "0"
    if tick and tick > 0:
        decimals = max(0, min(12, int(round(-math.log10(tick))) if tick < 1 else 0))
        if tick >= 1:
            decimals = 0
        text = f"{v:.{decimals}f}"
        return text.rstrip("0").rstrip(".") if "." in text else text
    av = abs(v)
    if av >= 10000:
        d = 2
    elif av >= 100:
        d = 3
    elif av >= 1:
        d = 4
    elif av >= 0.01:
        d = 6
    else:
        d = 8
    text = f"{v:.{d}f}"
    return text.rstrip("0").rstrip(".") if "." in text else text


def _bars_to_dicts(ohlcv: list) -> list[dict[str, Any]]:
    out: list[dict[str, Any]] = []
    for bar in ohlcv or []:
        if not bar or len(bar) < 6:
            continue
        try:
            out.append(
                {
                    "open_time_ms": int(bar[0]),
                    "open": float(bar[1]),
                    "high": float(bar[2]),
                    "low": float(bar[3]),
                    "close": float(bar[4]),
                    "volume": float(bar[5]),
                }
            )
        except (TypeError, ValueError):
            continue
    return out


def fetch_ohlcv_for_hub(
    *,
    symbol: str,
    timeframe: str,
    since_ms: int | None = None,
    limit: int = 500,
    normalize_symbol_input: Callable[[Any], str],
    normalize_exchange_symbol: Callable[[str], str],
    ensure_markets_loaded: Callable[[], None],
    exchange,
    friendly_error: Callable[[Exception], str] | None = None,
) -> dict[str, Any]:
    """从 ccxt 拉 OHLCV，供 hub_bridge /api/hub/ohlcv 返回。"""
    tf = normalize_chart_timeframe(timeframe)
    sym = normalize_symbol_input(symbol)
    if not sym:
        return {"ok": False, "msg": "symbol 不能为空"}
    try:
        ensure_markets_loaded()
        ex_sym = normalize_exchange_symbol(sym)
        want = max(1, min(int(limit or bar_limit_for_timeframe(tf)), 1500))
        chunk_max = 300
        collected: list = []

        if since_ms is not None and int(since_ms) > 0:
            since = int(since_ms)
            guard = 0
            while len(collected) < want and guard < 20:
                guard += 1
                batch = exchange.fetch_ohlcv(
                    ex_sym, timeframe=tf, since=since, limit=min(chunk_max, want - len(collected))
                )
                if not batch:
                    break
                collected.extend(batch)
                since = int(batch[-1][0]) + 1
                if len(batch) < min(chunk_max, want - len(collected)):
                    break
        else:
            batch = exchange.fetch_ohlcv(ex_sym, timeframe=tf, limit=want)
            collected = list(batch or [])

        bars = _bars_to_dicts(collected)
        if not bars:
            return {"ok": False, "msg": "交易所未返回 K 线"}

        tick = price_tick_from_market(exchange, ex_sym)
        uniq: dict[int, dict] = {}
        for b in bars:
            uniq[int(b["open_time_ms"])] = b
        merged = [uniq[k] for k in sorted(uniq.keys())]
        if len(merged) > want:
            merged = merged[-want:]

        return {
            "ok": True,
            "symbol": sym,
            "exchange_symbol": ex_sym,
            "timeframe": tf,
            "price_tick": tick,
            "bars": merged,
        }
    except Exception as e:
        msg = friendly_error(e) if friendly_error else str(e)
        return {"ok": False, "msg": f"K线加载失败：{msg}"}