#!/usr/bin/env python3
"""
加载已训练追踪器，处理新交易日。

用法:
  # 处理单个新日
  python scripts/inference.py --date 20260401 --tracker outputs/tracker_state.pkl --output outputs/new_day/

  # 批量处理
  python scripts/inference.py --date 20260401,20260402,20260403 --tracker outputs/tracker_state.pkl
"""

from __future__ import annotations

import argparse
import os
import sys
from pathlib import Path

import pandas as pd

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from src.data.loader import load_l2_day, BLACKLIST_DATES
from src.features.passive_orders import (
    compute_vwap,
    extract_passive_orders,
    prepare_features,
    select_candidates,
)
from src.clustering.daily_cluster import cluster_candidates
from src.matching.cross_day_match import match_multi_window
from src.tracking.entity_tracker import EntityTracker


def process_new_day(
    tracker: EntityTracker,
    date: int,
    max_cost: float = 3.5,
) -> dict:
    """处理一个新交易日，更新追踪器并返回信号。"""
    if date in BLACKLIST_DATES:
        print(f"[{date}] blacklisted, skip")
        return {"date": date, "score": 0.0, "error": "blacklisted"}

    # 加载数据
    try:
        data = load_l2_day(date)
    except Exception as e:
        print(f"[{date}] load failed: {e}")
        return {"date": date, "score": 0.0, "error": str(e)}

    trades = data["trades"]
    if "is_cancellation" in trades.columns:
        trades = trades[~trades["is_cancellation"]]
    trades = trades[trades["bs_flag_desc"].isin(["active_buy", "active_sell"])]
    if trades.empty:
        return {"date": date, "score": 0.0, "error": "empty trades"}

    # 被动单 + 聚类
    vwap = compute_vwap(trades)
    passive = extract_passive_orders(trades, vwap)
    candidates = select_candidates(passive, top_n=150)
    if candidates.empty or len(candidates) < 5:
        return {"date": date, "score": 0.0, "error": "too few candidates"}

    feats = prepare_features(candidates)
    _, centroids = cluster_candidates(candidates, feats)

    if not centroids:
        return {"date": date, "score": 0.0, "n_clusters": 0}

    # 跨日匹配：往前看最近已处理日
    recent = {}
    for prev_date in sorted(tracker._processed_dates)[-2:]:
        # 收集该日的簇信息（通过 cluster_registry 反查）
        day_clusters = {
            cid: tracker.entities[eid]
            for (d, cid), eid in tracker.cluster_registry.items()
            if d == prev_date and eid in tracker.entities
        }
        if day_clusters:
            # 重建 centroid 信息（用最近一次记录的）
            recent[prev_date] = {}
            for cid, e in day_clusters.items():
                if e.get("centroids"):
                    recent[prev_date][int(cid)] = {
                        "centroid_scaled": e["centroids"][-1][1]
                        if isinstance(e["centroids"][-1], tuple)
                        else e["centroids"][-1],
                        "centroid": e["centroids"][-1][1]
                        if isinstance(e["centroids"][-1], tuple)
                        else e["centroids"][-1],
                        "total_amount": e.get("total_amount_latest", 0),
                        "size": e.get("cluster_count", 1),
                        "dominant_side": e.get("dominant_sides", ["unknown"])[-1],
                        "bid_ratio": e.get("bid_ratio", 0.5),
                    }

    matches = match_multi_window(date, centroids, recent, max_cost=max_cost)

    # 更新追踪器
    tracker.process_day(date, centroids, matches)
    signal = tracker.compute_position_signal(date)
    signal["date"] = date

    print(
        f"[{date}] clusters={len(centroids)}, "
        f"matches={len(matches)}, "
        f"entities={len(tracker.entities)}, "
        f"score={signal['score']:.4f}"
    )

    return signal


def main():
    parser = argparse.ArgumentParser(description="新日推理")
    parser.add_argument("--date", required=True, help="日期 YYYYMMDD，多个用逗号分隔")
    parser.add_argument("--tracker", default="./outputs/tracker_state.pkl", help="追踪器状态文件")
    parser.add_argument("--output", default="./outputs/new_day", help="输出目录")
    parser.add_argument("--save-state", action="store_true", help="推理后保存更新状态")
    args = parser.parse_args()

    # 加载追踪器
    print(f"Loading tracker from {args.tracker}")
    tracker = EntityTracker.load_state(args.tracker)
    print(f"  Loaded: {len(tracker.entities)} entities, {len(tracker._processed_dates)} processed days")
    print(f"  Last processed: {max(tracker._processed_dates) if tracker._processed_dates else 'N/A'}")

    dates = [int(d.strip()) for d in args.date.split(",")]

    os.makedirs(args.output, exist_ok=True)

    signals = []
    for date in sorted(dates):
        sig = process_new_day(tracker, date)
        signals.append(sig)

    signals_df = pd.DataFrame(signals)

    # 合并历史信号
    hist_signals = tracker.get_daily_signals()
    all_signals = pd.concat([hist_signals, signals_df], ignore_index=True)

    sig_path = os.path.join(args.output, "position_signal_daily.parquet")
    all_signals.to_parquet(sig_path)
    print(f"\nSignals saved to {sig_path}")

    if args.save_state:
        state_path = os.path.join(args.output, "tracker_state_updated.pkl")
        tracker.save_state(state_path)

    # 最新信号
    print("\n===== 最新信号 =====")
    for sig in signals:
        print(
            f"  {sig['date']}: score={sig.get('score', 'N/A')}, "
            f"bid={sig.get('bid_entities', 'N/A')}, "
            f"ask={sig.get('ask_entities', 'N/A')}"
        )


if __name__ == "__main__":
    main()