"""
③ SHUTDOWN 절차 학습 (few-shot). startup의 역순.

형제 컬럼 호환: --data, --prefix CLI 인자.
"""
import argparse
import numpy as np
import pandas as pd
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt

BASE = "/home/windpacer/projects/hc900_ax/scripts/analysis/"


def detect_cutoffs(df):
    """★제품 컷오프★ 이벤트: product >100→<50 하강엣지이고 직후 steam도 하강(shutdown)."""
    prod = df["product"].values
    steam_op = df["steam_op"].values
    reb = df["reb_temp"].values
    outs = []
    i = 60
    n = len(df)
    while i < n:
        if prod[i] < 50 and prod[i-1] >= 100 and reb[i] > 60:
            fwd = steam_op[i:min(n, i+60)]
            if np.nanmean(fwd) < np.nanmean(steam_op[max(0, i-60):i]) * 0.8:
                outs.append(i)
                i += 720
                continue
        i += 1
    return outs


def shutdown_milestones(df, co):
    """컷오프 인덱스 co 기준 역방향 절차 추출."""
    tc = df["dtat"].iloc[co]
    n = len(df)

    def mins(i):
        return None if i is None else (df["dtat"].iloc[i] - tc).total_seconds() / 60

    feed_start = None
    feed_vals = df["feed"].values
    for j in range(co, max(0, co - 1200), -1):
        if feed_vals[j] < 100:
            feed_start = j
        if feed_start is not None and j > 0:
            if feed_vals[j] > feed_vals[min(j + 30, co)] * 0.85:
                continue
            if feed_vals[j] > 250 and feed_vals[j] > feed_vals[min(j + 1, co)] * 0.98:
                feed_start = j
                break

    steam_off = None
    for j in range(co, min(n, co + 600)):
        if df["steam_op"].iloc[j] < 5:
            steam_off = j
            break

    vacuum_off = None
    for j in range(co, min(n, co + 1200)):
        if df["vacuum"].iloc[j] > 300:
            vacuum_off = j
            break

    prod_off = None
    for j in range(co, min(n, co + 120)):
        if df["product"].iloc[j] < 10:
            prod_off = j
            break

    cold = None
    for j in range(co, min(n, co + 2400)):
        if df["reb_temp"].iloc[j] < 40:
            cold = j
            break

    r = df.iloc[co]
    return dict(cutoff_time=tc,
                feed_to_cutoff=-(mins(feed_start)) if feed_start is not None else None,
                cutoff_to_steam_off=mins(steam_off) if steam_off else None,
                cutoff_to_vacuum_off=mins(vacuum_off) if vacuum_off else None,
                cutoff_to_prod_off=mins(prod_off) if prod_off else None,
                cutoff_to_cold=mins(cold) if cold else None,
                cutoff_rebA=r["reb_temp"], cutoff_TC=r["T_C"], cutoff_TD=r["T_D"],
                cutoff_dT_AD=r["reb_temp"] - r["T_D"])


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--data", default=BASE + "c6111_data.pkl")
    parser.add_argument("--prefix", default="c6111")
    args = parser.parse_args()
    df = pd.read_pickle(args.data).sort_values("dtat").reset_index(drop=True)
    cutoffs = detect_cutoffs(df)
    print(f"탐지된 ★제품 컷오프★(shutdown 진입) 이벤트: {len(cutoffs)}개")

    if not cutoffs:
        print("  [skip] shutdown 이벤트 없음 — 플롯 생략")
        return
    rows, windows = [], []
    for co in cutoffs:
        w = df.iloc[max(0, co - 360):min(len(df), co + 360)].copy()
        w["rel_min"] = (w["dtat"] - df["dtat"].iloc[co]).dt.total_seconds() / 60
        windows.append(w)
        rows.append(shutdown_milestones(df, co))
    M = pd.DataFrame(rows)
    pd.set_option("display.width", 220)
    print("\n=== 제품컷오프 기준 절차(분) + 셧다운 시점 컬럼상태 ===")
    cols = ["cutoff_time", "feed_to_cutoff", "cutoff_to_steam_off",
            "cutoff_to_vacuum_off", "cutoff_to_prod_off", "cutoff_to_cold",
            "cutoff_rebA", "cutoff_TC", "cutoff_dT_AD"]
    show = M[cols].copy()
    show["cutoff_time"] = show["cutoff_time"].dt.strftime("%m-%d %H:%M")
    print(show.round(1).to_string(index=False))
    print("\n=== 셧다운 레시피(중앙값) ===")
    print(f"  피드감소→컷오프: {M.feed_to_cutoff.median():.0f}분")
    print(f"  컷오프→스팀차단 : {M.cutoff_to_steam_off.median():.0f}분")
    print(f"  컷오프→진공해제 : {M.cutoff_to_vacuum_off.median():.0f}분")
    print(f"  컷오프→제품0   : {M.cutoff_to_prod_off.median():.0f}분")
    print(f"  컷오프→냉각    : {M.cutoff_to_cold.median():.0f}분")
    reb_std = M.cutoff_rebA.std() if len(M) > 1 else 0.0
    tc_std = M.cutoff_TC.std() if len(M) > 1 else 0.0
    print(f"  ★셧다운 트리거: reb-A={M.cutoff_rebA.median():.1f}±{reb_std:.1f}℃, "
          f"T_C={M.cutoff_TC.median():.1f}±{tc_std:.2f}℃, ΔT(A-D)={M.cutoff_dT_AD.median():.1f}℃")

    fig, ax = plt.subplots(4, 1, figsize=(13, 11), sharex=True)
    for k, w in enumerate(windows):
        c = plt.cm.tab10(k)
        ax[0].plot(w.rel_min, w.reb_temp, color=c, lw=.9, label=f"sh{k+1} {w.dtat.iloc[len(w)//2]:%m-%d}")
        ax[0].plot(w.rel_min, w["T_D"], color=c, lw=.6, ls=":")
        ax[1].plot(w.rel_min, w.steam_flow, color=c, lw=.9)
        ax[2].plot(w.rel_min, w.reflux, color=c, lw=.9)
        ax[2].plot(w.rel_min, w["product"], color=c, lw=.9, ls="--")
        ax[3].plot(w.rel_min, w.feed, color=c, lw=.9)
    ax[0].set_ylabel("reb_temp/T_D(:)"); ax[0].legend(fontsize=7)
    ax[0].set_title("SHUTDOWN aligned at PRODUCT CUT-OFF (rel=0)")
    ax[1].set_ylabel("steam flow"); ax[2].set_ylabel("reflux/product(--)")
    ax[3].set_ylabel("feed"); ax[3].set_xlabel("minutes from product cut-off")
    for a in ax:
        a.axvline(0, c="k", lw=.5)
    fig.tight_layout(); fig.savefig(BASE + f"{args.prefix}_shutdown.png", dpi=95)
    print(f"\n플롯 저장: {BASE}{args.prefix}_shutdown.png")


if __name__ == "__main__":
    main()