"""
04-4: EV·리스크 필터로 최종 규칙 선별 및 리포트 생성.
"""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any

import numpy as np
import pandas as pd

from config import (
    MATCH_BEST_EFFORT_PER_SIDE,
    MATCH_GT_TOLERANCE_MIN,
    MATCH_HOLDOUT_RATIO,
    MATCH_KIND_PRIORITY,
    MATCH_LABEL_MODE,
    MATCH_MAX_RULES_PER_SIDE,
    MATCH_MAX_VALID_FIRE_RATE,
    MATCH_MIN_EV_VALID,
    MATCH_MIN_FIRES,
    MATCH_MIN_FIRES_HOLDOUT,
    MATCH_MIN_PROFIT_FACTOR,
    MATCH_MONITOR_MAX_PER_SIDE,
    MATCH_TRAIN_RATIO,
)
from deepcoin.ground_truth.ground_truth import load_ground_truth
from deepcoin.paths import resolve_ground_truth_file


def _split_train_valid_holdout(df: pd.DataFrame, dt_col: str = "dt") -> pd.Series:
    """
    시계열 3분할: train / valid / holdout(최근 MATCH_HOLDOUT_RATIO).

    Args:
        df: fire_outcomes.
        dt_col: 시각 컬럼.

    Returns:
        'train' | 'valid' | 'holdout' Series.
    """
    ts = pd.to_datetime(df[dt_col])
    holdout_start = ts.quantile(1.0 - MATCH_HOLDOUT_RATIO)
    in_sample = ts <= holdout_start
    cutoff = (
        ts[in_sample].quantile(MATCH_TRAIN_RATIO)
        if in_sample.any()
        else ts.quantile(MATCH_TRAIN_RATIO)
    )
    split = np.where(
        in_sample,
        np.where(ts <= cutoff, "train", "valid"),
        "holdout",
    )
    return pd.Series(split, index=df.index)


def _kind_rank(kind: str) -> int:
    """kind 우선순위 (작을수록 우선)."""
    try:
        return MATCH_KIND_PRIORITY.index(kind)
    except ValueError:
        return len(MATCH_KIND_PRIORITY)


def _rule_metrics(sub: pd.DataFrame) -> dict[str, float | int]:
    """
    규칙·구간별 집계 지표.

    Args:
        sub: fire_outcomes 부분집합.

    Returns:
        count, ev, win_rate, profit_factor.
    """
    if sub.empty:
        return {"count": 0, "ev_pct": 0.0, "win_rate": 0.0, "profit_factor": 0.0}
    r = sub["forward_ret_pct"]
    wins = r[r > 0]
    losses = r[r <= 0]
    pf = (
        float(wins.sum() / abs(losses.sum()))
        if len(losses) and losses.sum() != 0
        else float(wins.sum()) if len(wins) else 0.0
    )
    return {
        "count": int(len(sub)),
        "ev_pct": round(float(r.mean()), 4),
        "win_rate": round(float((r > 0).mean()), 4),
        "profit_factor": round(pf, 4),
    }


def gt_overlap_report(
    fires: pd.DataFrame,
    gt_trades: list[dict[str, Any]],
    tolerance_min: int = MATCH_GT_TOLERANCE_MIN,
) -> dict[str, Any]:
    """
    GT 타점이 규칙 발화와 ±tolerance 내 겹치는 비율을 계산합니다.

    Args:
        fires: rule_fires.
        gt_trades: ground truth trades.
        tolerance_min: 분 단위 허용.

    Returns:
        side별 recall dict.
    """
    tol = pd.Timedelta(minutes=tolerance_min)
    report: dict[str, Any] = {}
    for side in ("buy", "sell"):
        gt_side = [t for t in gt_trades if t.get("action") == side]
        f_side = fires[fires["side"] == side] if not fires.empty else pd.DataFrame()
        if not gt_side or f_side.empty:
            report[side] = {"gt_count": len(gt_side), "matched": 0, "recall": 0.0}
            continue
        fire_ts = pd.to_datetime(f_side["dt"]).sort_values()
        matched = 0
        for t in gt_side:
            gts = pd.Timestamp(t["dt"])
            delta = (fire_ts - gts).abs()
            if (delta <= tol).any():
                matched += 1
        report[side] = {
            "gt_count": len(gt_side),
            "matched": matched,
            "recall": round(matched / len(gt_side), 4) if gt_side else 0.0,
        }
    return report


def select_matched_rules(
    outcomes: pd.DataFrame,
    candidates: dict[str, Any],
    gt_path: Path | None = None,
) -> dict[str, Any]:
    """
    valid 구간 EV·PF 기준으로 규칙을 선별합니다.

    Args:
        outcomes: fire_outcomes.
        candidates: rule_candidates dict.
        gt_path: ground truth JSON.

    Returns:
        matched_rules + summaries.
    """
    if outcomes.empty:
        return {"selected": [], "rejected": [], "note": "발화 없음"}

    outcomes = outcomes.copy()
    outcomes["split"] = _split_train_valid_holdout(outcomes)
    valid_dt = pd.to_datetime(outcomes.loc[outcomes["split"] == "valid", "dt"])
    valid_bars = max(
        int((valid_dt.max() - valid_dt.min()).total_seconds() / 180) + 1, 1
    ) if len(valid_dt) > 1 else 1

    gt_file = gt_path or resolve_ground_truth_file()
    gt_data = load_ground_truth(gt_file) or {}
    gt_trades = gt_data.get("trades") or []

    summaries: list[dict[str, Any]] = []
    for rule in candidates.get("rules", []):
        rid = rule["rule_id"]
        sub = outcomes[outcomes["rule_id"] == rid]
        train = sub[sub["split"] == "train"]
        valid = sub[sub["split"] == "valid"]
        holdout = sub[sub["split"] == "holdout"]
        m_all = _rule_metrics(sub)
        m_train = _rule_metrics(train)
        m_valid = _rule_metrics(valid)
        m_holdout = _rule_metrics(holdout)
        fire_rate = m_valid["count"] / valid_bars if valid_bars else 1.0
        pass_valid = (
            m_valid["count"] >= MATCH_MIN_FIRES
            and m_valid["ev_pct"] >= MATCH_MIN_EV_VALID
            and m_valid["profit_factor"] >= MATCH_MIN_PROFIT_FACTOR
            and fire_rate <= MATCH_MAX_VALID_FIRE_RATE
        )
        pass_holdout = (
            m_holdout["count"] >= MATCH_MIN_FIRES_HOLDOUT
            and m_holdout["ev_pct"] >= MATCH_MIN_EV_VALID
            and m_holdout["profit_factor"] >= MATCH_MIN_PROFIT_FACTOR
        )
        summaries.append(
            {
                "rule_id": rid,
                "side": rule["side"],
                "kind": rule.get("kind", ""),
                "conditions": rule["conditions"],
                "valid_fire_rate": round(fire_rate, 4),
                "metrics": {
                    "all": m_all,
                    "train": m_train,
                    "valid": m_valid,
                    "holdout": m_holdout,
                },
                "pass_valid": pass_valid,
                "pass_holdout": pass_holdout,
            }
        )

    selected: list[dict[str, Any]] = []
    for side in ("buy", "sell"):
        pool = [s for s in summaries if s["side"] == side and s["pass_valid"]]
        pool.sort(
            key=lambda x: (
                x["metrics"]["valid"]["ev_pct"],
                -_kind_rank(x.get("kind", "")),
            ),
            reverse=True,
        )
        selected.extend(pool[:MATCH_MAX_RULES_PER_SIDE])

    best_effort: list[dict[str, Any]] = []
    if not selected:
        for side in ("buy", "sell"):
            pool = [
                s
                for s in summaries
                if s["side"] == side
                and s["metrics"]["valid"]["count"] >= MATCH_MIN_FIRES
                and s.get("valid_fire_rate", 1) <= MATCH_MAX_VALID_FIRE_RATE
            ]
            pool.sort(
                key=lambda x: (
                    x["metrics"]["valid"]["ev_pct"],
                    -_kind_rank(x.get("kind", "")),
                ),
                reverse=True,
            )
            best_effort.extend(pool[:MATCH_BEST_EFFORT_PER_SIDE])

    rejected = [s for s in summaries if s not in selected and s not in best_effort]

    overlap = gt_overlap_report(
        outcomes[["rule_id", "side", "dt"]].drop_duplicates(),
        gt_trades,
    )

    holdout_passed = [s for s in summaries if s["pass_valid"] and s["pass_holdout"]]
    monitor_rules: list[dict[str, Any]] = []
    for side in ("buy", "sell"):
        pool = [s for s in holdout_passed if s["side"] == side]
        pool.sort(
            key=lambda x: (
                x["metrics"]["holdout"]["ev_pct"],
                -_kind_rank(x.get("kind", "")),
            ),
            reverse=True,
        )
        monitor_rules.extend(pool[:MATCH_MONITOR_MAX_PER_SIDE])
    if not monitor_rules:
        for side in ("buy", "sell"):
            pool = [s for s in selected if s["side"] == side] or [
                s for s in best_effort if s["side"] == side
            ]
            pool.sort(
                key=lambda x: (
                    x["metrics"].get("holdout", x["metrics"]["valid"])["ev_pct"],
                    -_kind_rank(x.get("kind", "")),
                ),
                reverse=True,
            )
            monitor_rules.extend(pool[:MATCH_MONITOR_MAX_PER_SIDE])

    active = selected if selected else best_effort
    result = {
        "method": "gt_profile_plus_full_bar_ev_filter",
        "label_mode": MATCH_LABEL_MODE,
        "train_ratio": MATCH_TRAIN_RATIO,
        "holdout_ratio": MATCH_HOLDOUT_RATIO,
        "criteria": {
            "min_fires_valid": MATCH_MIN_FIRES,
            "min_fires_holdout": MATCH_MIN_FIRES_HOLDOUT,
            "min_ev_valid_pct": MATCH_MIN_EV_VALID,
            "min_profit_factor_valid": MATCH_MIN_PROFIT_FACTOR,
            "max_valid_fire_rate": MATCH_MAX_VALID_FIRE_RATE,
        },
        "selected": selected,
        "selected_best_effort": best_effort,
        "holdout_passed": holdout_passed,
        "monitor_rules": monitor_rules,
        "active_rules": active,
        "strict_pass": len(selected) > 0,
        "holdout_pass": len(holdout_passed) > 0,
        "rejected_count": len(rejected),
        "gt_overlap": overlap,
        "valid_bars_approx": valid_bars,
        "all_rule_summaries": summaries,
        "note": (
            "strict EV/PF 통과 규칙 없음 — selected_best_effort는 valid EV 상위(튜닝용)"
            if not selected
            else ""
        ),
    }
    n_out = len(selected) or len(best_effort)
    print(
        f"[04-4] 선별: strict {len(selected)}개, holdout통과 {len(holdout_passed)}개, "
        f"05감시 {len(monitor_rules)}개 / 후보 {len(summaries)}개"
    )
    return result


def write_backtest_summary_html(
    matched: dict[str, Any],
    out_path: Path,
) -> Path:
    """
    backtest_summary.html 생성.

    Args:
        matched: select_matched_rules 결과.
        out_path: HTML 경로.

    Returns:
        out_path.
    """
    rows = []
    show = matched.get("monitor_rules") or matched.get("selected") or []
    title = "05 monitor_rules (holdout 우선)"
    for s in show:
        v = s["metrics"]["valid"]
        h = s["metrics"].get("holdout", {})
        rows.append(
            f"<tr><td>{s['rule_id']}</td><td>{s['side']}</td>"
            f"<td>{v['count']}</td><td>{v['ev_pct']}</td>"
            f"<td>{h.get('count', 0)}</td><td>{h.get('ev_pct', 0)}</td>"
            f"<td>{h.get('profit_factor', 0)}</td></tr>"
        )
    gt = matched.get("gt_overlap", {})
    html = f"""<!DOCTYPE html>
<html lang="ko"><head><meta charset="utf-8"/>
<title>04 Backtest Summary</title>
<style>
body {{ font-family: "Malgun Gothic", Arial, sans-serif; margin: 24px; }}
table {{ border-collapse: collapse; width: 100%; }}
th, td {{ border: 1px solid #ccc; padding: 8px; text-align: left; }}
th {{ background: #e2e8f0; }}
</style></head><body>
<h1>04 매칭 — {title} (valid 구간)</h1>
<p>방법: {matched.get('method','')}</p>
<p>{matched.get('note','')}</p>
<h2>선별 규칙</h2>
<table>
<thead><tr><th>rule_id</th><th>side</th><th>valid_n</th><th>valid_ev</th>
<th>holdout_n</th><th>holdout_ev</th><th>holdout_pf</th></tr></thead>
<tbody>{''.join(rows) if rows else '<tr><td colspan="6">통과 규칙 없음</td></tr>'}</tbody>
</table>
<h2>GT recall (±{MATCH_GT_TOLERANCE_MIN}분, 전체 발화 기준)</h2>
<ul>
<li>매수: {gt.get('buy', {})}</li>
<li>매도: {gt.get('sell', {})}</li>
</ul>
</body></html>"""
    out_path.parent.mkdir(parents=True, exist_ok=True)
    out_path.write_text(html, encoding="utf-8")
    print(f"[04-4] 리포트: {out_path}")
    return out_path