"""
Structure Flow Swing Strategy v3.1
==================================
波段交易策略 — 基于4H震荡区间，保守参数 v2

v3.1 改动（基于v3.0诊断结果）：
  1. 双边测试 AND→OR：在10根K线内测试过支撑 OR 阻力即可（不需两者都测过）
  2. 区间稳定性 15%→25%：放宽波动容忍度
  3. 入场范围 2%→3%：增加候选信号密度
  4. 冷却期 3根→1根：减少过渡过滤

保留：纯震荡定位、ATR×1.5止损、区间70%止盈、D1趋势过滤

预期：年交易量从9笔 → 50-80笔（约1-2单/周）

版本历史：
  v3.0 (2026-06-10): 初版，基于冯总波段交易新思路
  v3.1 (2026-06-10): 降低条件门槛，提升交易频率
"""

from datetime import datetime
import numpy as np
import pandas as pd
from pandas import DataFrame
from freqtrade.strategy import IStrategy, IntParameter, informative
from freqtrade.persistence import Trade


class StructureFlowSwingV31(IStrategy):
    """
    Structure Flow Swing Strategy v3.1
    4H震荡区间波段交易 — 放宽震荡判定
    """

    can_short = True
    stoploss = -0.20
    use_custom_stoploss = True
    minimal_roi = {"0": 100}
    max_open_trades = 1
    timeframe = "4h"

    # =====================
    # 可优化参数（放宽后默认值）
    # =====================
    swing_lookback = IntParameter(4, 8, default=5, space="buy")
    zone_stability_threshold = IntParameter(15, 40, default=25, space="buy")  # v3.1: 15→25↑
    entry_zone_pct = IntParameter(1, 5, default=3, space="buy")               # v3.1: 2→3↑
    atr_stop_mult = IntParameter(10, 25, default=15, space="buy")
    take_profit_pct = IntParameter(50, 80, default=70, space="sell")

    # 固定参数
    zone_touch_lookback = 10
    breakout_bars = 2

    # =====================
    # 工具：Swing Point 检测
    # =====================

    @staticmethod
    def _detect_swing_points(
        high: pd.Series,
        low: pd.Series,
        window: int = 5,
    ) -> tuple[pd.Series, pd.Series]:
        n = len(high)
        sh = pd.Series(np.nan, index=high.index, dtype=float)
        sl = pd.Series(np.nan, index=low.index, dtype=float)
        for i in range(window, n - window):
            if high.iloc[i] > high.iloc[i - window:i].max() and high.iloc[i] > high.iloc[i + 1:i + window + 1].max():
                sh.iloc[i] = high.iloc[i]
            if low.iloc[i] < low.iloc[i - window:i].min() and low.iloc[i] < low.iloc[i + 1:i + window + 1].min():
                sl.iloc[i] = low.iloc[i]
        return sh, sl

    # =====================
    # 工具：区间震荡检测
    # =====================

    def _detect_range(
        self,
        sh: pd.Series,
        sl: pd.Series,
        high: pd.Series,
        low: pd.Series,
        close: pd.Series,
    ) -> DataFrame:
        n = len(high)
        is_ranging = np.full(n, False)
        support_arr = np.full(n, np.nan)
        resistance_arr = np.full(n, np.nan)
        zone_width_arr = np.full(n, np.nan)

        sh_prices = []
        sl_prices = []

        for i in range(n):
            if pd.notna(sh.iloc[i]):
                sh_prices.append(sh.iloc[i])
                if len(sh_prices) > 5:
                    sh_prices.pop(0)
            if pd.notna(sl.iloc[i]):
                sl_prices.append(sl.iloc[i])
                if len(sl_prices) > 5:
                    sl_prices.pop(0)

            if len(sh_prices) < 3 or len(sl_prices) < 3:
                continue

            current_sh = sh_prices[-1]
            current_sl = sl_prices[-1]

            if current_sh <= current_sl:
                continue

            zone_width = (current_sh - current_sl) / current_sl
            support_arr[i] = current_sl
            resistance_arr[i] = current_sh
            zone_width_arr[i] = zone_width

            # 条件1：区间宽度稳定性
            widths = []
            for j in range(min(len(sh_prices), len(sl_prices)) - 1, -1, -1):
                w = (sh_prices[j] - sl_prices[j]) / sl_prices[j]
                widths.append(w)
                if len(widths) >= 3:
                    break

            if len(widths) >= 3:
                mean_width = np.mean(widths)
                if mean_width > 0:
                    max_dev = max(abs(w - mean_width) / mean_width for w in widths)
                    stability_threshold = self.zone_stability_threshold.value / 100.0
                    is_stable = max_dev <= stability_threshold
                else:
                    is_stable = False
            else:
                is_stable = False

            if not is_stable:
                continue

            # 条件2：价格测试过边界 — v3.1: AND→OR
            # 只需要测试过支撑或阻力之一，不需要两者都测过
            start_idx = max(0, i - self.zone_touch_lookback)
            support_zone_upper = current_sl * 1.01
            touched_support = any(
                low.iloc[j] <= support_zone_upper
                for j in range(start_idx, i + 1)
            )
            resistance_zone_lower = current_sh * 0.99
            touched_resistance = any(
                high.iloc[j] >= resistance_zone_lower
                for j in range(start_idx, i + 1)
            )

            # v3.1: AND → OR
            if not (touched_support or touched_resistance):
                continue

            # 条件3：无突破
            consecutive_outside = 0
            for j in range(i, max(0, i - self.breakout_bars) - 1, -1):
                if close.iloc[j] > current_sh or close.iloc[j] < current_sl:
                    consecutive_outside += 1
                else:
                    break

            if consecutive_outside >= self.breakout_bars:
                continue

            is_ranging[i] = True

        return DataFrame({
            "is_ranging": is_ranging,
            "support": support_arr,
            "resistance": resistance_arr,
            "zone_width": zone_width_arr,
        }, index=high.index)

    # =====================
    # 工具：ATR计算
    # =====================

    @staticmethod
    def _calc_atr(high: pd.Series, low: pd.Series, close: pd.Series, period: int = 14) -> pd.Series:
        tr = pd.DataFrame({
            "hl": high - low,
            "hc": (high - close.shift(1)).abs(),
            "lc": (low - close.shift(1)).abs(),
        }).max(axis=1)
        return tr.rolling(period).mean()

    # ================================================================
    # D1 信息时间框架 — 宏观趋势参考
    # ================================================================

    @informative("1d")
    def populate_indicators_1d(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        sh, sl = self._detect_swing_points(
            dataframe["high"], dataframe["low"], window=5
        )
        sh_vals = sh.dropna()
        sl_vals = sl.dropna()

        is_uptrend = pd.Series(False, index=dataframe.index)
        is_downtrend = pd.Series(False, index=dataframe.index)

        if len(sh_vals) >= 2 and len(sl_vals) >= 2:
            if sh_vals.iloc[-1] > sh_vals.iloc[-2] and sl_vals.iloc[-1] > sl_vals.iloc[-2]:
                is_uptrend[:] = True
            elif sh_vals.iloc[-1] < sh_vals.iloc[-2] and sl_vals.iloc[-1] < sl_vals.iloc[-2]:
                is_downtrend[:] = True

        dataframe["d1_uptrend"] = is_uptrend
        dataframe["d1_downtrend"] = is_downtrend
        return dataframe

    # ================================================================
    # 主时间框架 — 4H 指标
    # ================================================================

    def populate_indicators(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        sh, sl = self._detect_swing_points(
            dataframe["high"], dataframe["low"],
            self.swing_lookback.value,
        )

        range_info = self._detect_range(sh, sl, dataframe["high"], dataframe["low"], dataframe["close"])
        dataframe["is_ranging"] = range_info["is_ranging"]
        dataframe["range_support"] = range_info["support"]
        dataframe["range_resistance"] = range_info["resistance"]
        dataframe["zone_width_pct"] = range_info["zone_width"]

        dataframe["atr"] = self._calc_atr(dataframe["high"], dataframe["low"], dataframe["close"], 14)

        # 价格在区间内的位置
        denom = dataframe["range_resistance"] - dataframe["range_support"]
        dataframe["zone_position"] = np.where(
            denom > 0,
            (dataframe["close"] - dataframe["range_support"]) / denom,
            np.nan,
        )

        # 距离边界百分比
        dataframe["dist_to_support"] = np.where(
            dataframe["range_support"] > 0,
            (dataframe["close"] - dataframe["range_support"]) / dataframe["close"],
            np.nan,
        )
        dataframe["dist_to_resistance"] = np.where(
            dataframe["range_resistance"] > 0,
            (dataframe["range_resistance"] - dataframe["close"]) / dataframe["close"],
            np.nan,
        )

        for col in ["is_ranging", "zone_position", "dist_to_support", "dist_to_resistance"]:
            if col in dataframe.columns:
                dataframe[col] = dataframe[col].fillna(False if col == "is_ranging" else 999)

        return dataframe

    # ================================================================
    # 入场信号 — v3.1: 冷却期 3→1
    # ================================================================

    def populate_entry_trend(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        entry_zone = self.entry_zone_pct.value / 100.0

        d1_downtrend_col = "d1_downtrend_1d"
        d1_uptrend_col = "d1_uptrend_1d"

        for col in ["is_ranging", d1_uptrend_col, d1_downtrend_col]:
            if col in dataframe.columns:
                dataframe[col] = dataframe[col].fillna(False)
            else:
                dataframe[col] = False

        # ── 做多：震荡市中，价格靠近支撑位 ──
        long_conds = (
            dataframe["is_ranging"]
            & (dataframe["dist_to_support"] <= entry_zone)
            & (dataframe["dist_to_support"] > 0)
            & (~dataframe[d1_downtrend_col])
        )

        cooldown = 1  # v3.1: 3→1
        long_recent = long_conds.rolling(cooldown, min_periods=1).max().shift(1) == 0
        dataframe.loc[long_conds & long_recent, "enter_long"] = 1

        # ── 做空：震荡市中，价格靠近阻力位 ──
        short_conds = (
            dataframe["is_ranging"]
            & (dataframe["dist_to_resistance"] <= entry_zone)
            & (dataframe["dist_to_resistance"] > 0)
            & (~dataframe[d1_uptrend_col])
        )

        short_recent = short_conds.rolling(cooldown, min_periods=1).max().shift(1) == 0
        dataframe.loc[short_conds & short_recent, "enter_short"] = 1

        return dataframe

    # ================================================================
    # 出场信号
    # ================================================================

    def populate_exit_trend(self, dataframe: DataFrame, metadata: dict) -> DataFrame:
        return dataframe

    # ================================================================
    # 自定义止损：支撑/阻力外侧，ATR*1.5 缓冲
    # ================================================================

    def custom_stoploss(
        self,
        pair: str,
        trade: Trade,
        current_time: datetime,
        current_rate: float,
        current_profit: float,
        after_fill: bool,
        **kwargs,
    ) -> float:
        dataframe, _ = self.dp.get_analyzed_dataframe(pair, self.timeframe)
        if dataframe is None or len(dataframe) == 0:
            return -0.02 if not trade.is_short else 0.02

        last = dataframe.iloc[-1]
        atr_mult = self.atr_stop_mult.value / 10.0

        if not trade.is_short:
            support = last.get("range_support", np.nan)
            atr = last.get("atr", np.nan)

            if pd.isna(support) or support <= 0:
                return -0.02

            if pd.notna(atr) and atr > 0:
                sl_price = support - atr * atr_mult
            else:
                sl_price = support * 0.985

            sl_ratio = (sl_price / current_rate) - 1.0
            return max(sl_ratio, -0.20)
        else:
            resistance = last.get("range_resistance", np.nan)
            atr = last.get("atr", np.nan)

            if pd.isna(resistance) or resistance <= 0:
                return 0.02

            if pd.notna(atr) and atr > 0:
                sl_price = resistance + atr * atr_mult
            else:
                sl_price = resistance * 1.015

            sl_ratio = 1.0 - (sl_price / current_rate)
            return min(sl_ratio, 0.20)

    # ================================================================
    # 自定义止盈：区间70%
    # ================================================================

    def custom_exit(
        self,
        pair: str,
        trade: Trade,
        current_time: datetime,
        current_rate: float,
        current_profit: float,
        **kwargs,
    ) -> str | None:
        tp_pct = self.take_profit_pct.value / 100.0

        dataframe, _ = self.dp.get_analyzed_dataframe(pair, self.timeframe)
        if dataframe is None or len(dataframe) == 0:
            return None

        last = dataframe.iloc[-1]

        if not trade.is_short:
            support = last.get("range_support", np.nan)
            resistance = last.get("range_resistance", np.nan)

            if pd.notna(support) and pd.notna(resistance) and resistance > support:
                zone_height = (resistance - support) / support
                tp_target = zone_height * tp_pct
                if current_profit >= tp_target:
                    return "take_profit"
        else:
            support = last.get("range_support", np.nan)
            resistance = last.get("range_resistance", np.nan)

            if pd.notna(support) and pd.notna(resistance) and resistance > support:
                zone_height = (resistance - support) / resistance
                tp_target = zone_height * tp_pct
                if current_profit >= tp_target:
                    return "take_profit"

        return None

    # ================================================================
    # Plot config
    # ================================================================

    @staticmethod
    def plot_config() -> dict:
        return {
            "main_plot": {
                "range_support": {"color": "green", "type": "line"},
                "range_resistance": {"color": "red", "type": "line"},
            },
            "subplots": {
                "range": {
                    "is_ranging": {"color": "blue", "type": "line"},
                    "zone_width_pct": {"color": "purple", "type": "line"},
                },
                "position": {
                    "dist_to_support": {"color": "green", "type": "line"},
                    "dist_to_resistance": {"color": "red", "type": "line"},
                },
            },
        }
