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#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
Mature Cloud Removal (temporal descendant masking)

κ°œμ„  κ°œμš”
- step2의 label/link κ²°κ³Όλ₯Ό 따라가며 초기 ꡬ름 λ˜λŠ” μ„±μˆ™ κ΅¬λ¦„μœΌλ‘œ νŒμ •λœ ν΄λŸ¬μŠ€ν„°μ™€ 미래 ν΄λŸ¬μŠ€ν„°λ₯Ό μ œκ±°ν•œλ‹€.
- 제거 쑰건은 BT, radar κ°’, κ³Όκ±° μ—°κ²° μ—¬λΆ€, ν΄λŸ¬μŠ€ν„° 크기λ₯Ό ν•¨κ»˜ μ‚¬μš©ν•œλ‹€.
- μ΅œμ‹  버전은 μœ„κ²½λ„/λ‚™λ’° λ³΄μ‘°νŒŒμΌμ„ μ‚¬μš©ν•˜μ§€ μ•Šκ³ , BT μž…λ ₯의 ir105 및 RADAR_VAR(hsr)만 μ‚¬μš©ν•œλ‹€.

λ§ˆμŠ€ν‚Ή 쑰건
1. BT <= MATURE_THRESHOLD K이면 ν•΄λ‹Ή μ‹œμ  이후 ν΄λŸ¬μŠ€ν„° 제거
2. RADAR_VAR >= RADAR_THRESHOLD dBZ이면 ν•΄λ‹Ή μ‹œμ  이후 ν΄λŸ¬μŠ€ν„° 제거
3. radar μ˜μ—­ 밖이고 κ³Όκ±° 연결이 μ—†μœΌλ©΄ 전체 생애주기 제거
4. MIN_SIZE_THRESHOLD ν”½μ…€ 이상이고 κ³Όκ±° 연결이 μ—†μœΌλ©΄ 전체 생애주기 제거

* μž…λ ₯
    - step2 label: YYYYMMDDHHMM_label.nc
    - step2 links: YYYYMMDDHHMM_links.pkl
    - BT/RADAR npy: concat_gk2a_radar_YYYYMMDDHHMM.npy (ir105, hsr/cappi)
* κ²°κ³Όλ¬Ό
    - YYYYMMDDHHMM_label.nc (제거 λŒ€μƒ ν΄λŸ¬μŠ€ν„°κ°€ NaN 처리된 μ΅œμ’… label)

경둜 μ„€μ •
- CONCAT_BT_BASE/LABEL_BASE/LINKS_BASE/SAVE_DIRλŠ” import μ‹œμ μ—λŠ” 빈 λ¬Έμžμ—΄μ΄λ‹€.
- mainμ—μ„œ build/run/step3_mature_cloud_masking_config.json을 읽은 λ’€ apply_config()κ°€ μ‹€μ œ 경둜둜 μ±„μš΄λ‹€.
- bt_rootκ°€ data_preprocess/result/res_2km처럼 L1B/L2 폴더이면, μ‹€μ œ labeling μž…λ ₯인 L1B/YYYYMMDDλ₯Ό μžλ™ μ„ νƒν•œλ‹€.
"""
import os
import sys
import argparse
import numpy as np
import xarray as xr
from datetime import datetime, timedelta, timezone
from collections import deque
from tqdm import tqdm
import pickle
import pandas as pd

# ──────────────────────────────────────────────────────────────
# 경둜/νŒŒλΌλ―Έν„°
# ──────────────────────────────────────────────────────────────
try:
    sys.stdout.reconfigure(encoding="utf-8", errors="replace")
    sys.stderr.reconfigure(encoding="utf-8", errors="replace")
except AttributeError:
    pass


CONFIG_NAME = "step3_mature_cloud_masking_config.json"


def _find_package_root(config_name: str) -> str:
    cur = os.path.dirname(os.path.abspath(__file__))
    while True:
        if os.path.exists(os.path.join(cur, "build", "run", config_name)):
            return cur
        parent = os.path.dirname(cur)
        if parent == cur:
            return os.path.abspath(os.getcwd())
        cur = parent


ROOT = _find_package_root(CONFIG_NAME)
RUN_DIR = os.path.join(ROOT, "build", "run")
sys.path.insert(0, ROOT)

from .config_utils import load_config


def _resolve_path(path: str) -> str:
    if os.path.isabs(path):
        return path
    return os.path.abspath(os.path.join(RUN_DIR, path))


def _has_date_dirs(path: str) -> bool:
    if not os.path.isdir(path):
        return False
    return any(
        os.path.isdir(os.path.join(path, name)) and len(name) == 8 and name.isdigit()
        for name in os.listdir(path)
    )


def _resolve_data_root(path: str) -> str:
    if _has_date_dirs(path):
        return path
    for subdir in ("L1B", "l1b"):
        candidate = os.path.join(path, subdir)
        if _has_date_dirs(candidate):
            return candidate
    return path


# Config 적용 μ „ placeholder. μ‹€μ œ 값은 apply_config()μ—μ„œ μ±„μš΄λ‹€.
CONCAT_BT_BASE = ""
LABEL_BASE = ""
LINKS_BASE = ""
SAVE_DIR = ""

MATURE_THRESHOLD = 233.0  # IR10.5 (K)
RADAR_VAR        = "hsr"  # μ‚¬μš©ν•  λ ˆμ΄λ” λ³€μˆ˜: "hsr" λ˜λŠ” "cappi"
RADAR_THRESHOLD  = 35.0   # dBZ

TIME_STEP         = 10    # λΆ„
MAX_REMOVE_HOURS  = 6     # μ‹œκ°„

# 초기 ꡬ름 필터링 μ„€μ •
MIN_SIZE_THRESHOLD = 156   # ν”½μ…€ 수 μž„κ³„κ°’

START_TIME = "202508010000"  # YYYYMMDDHHMM
END_TIME   = "202510312350"  # YYYYMMDDHHMM


def apply_config(cfg: dict) -> None:
    global CONCAT_BT_BASE, LABEL_BASE, LINKS_BASE, SAVE_DIR
    global MATURE_THRESHOLD, RADAR_VAR, RADAR_THRESHOLD, TIME_STEP
    global MAX_REMOVE_HOURS, MIN_SIZE_THRESHOLD, START_TIME, END_TIME

    CONCAT_BT_BASE = _resolve_data_root(_resolve_path(cfg["bt_root"]))
    LABEL_BASE = _resolve_path(cfg["label_root"])
    LINKS_BASE = _resolve_path(cfg.get("links_root", cfg["label_root"]))
    SAVE_DIR = _resolve_path(cfg["output_dir"])
    os.makedirs(SAVE_DIR, exist_ok=True)

    MATURE_THRESHOLD = float(cfg.get("mature_threshold", MATURE_THRESHOLD))
    RADAR_VAR = cfg.get("radar_var", RADAR_VAR)
    RADAR_THRESHOLD = float(cfg.get("radar_threshold", RADAR_THRESHOLD))
    TIME_STEP = int(cfg.get("time_step_min", TIME_STEP))
    MAX_REMOVE_HOURS = int(cfg.get("max_remove_hours", MAX_REMOVE_HOURS))
    MIN_SIZE_THRESHOLD = int(cfg.get("min_size_threshold", MIN_SIZE_THRESHOLD))
    START_TIME = cfg.get("start_time", START_TIME)
    END_TIME = cfg.get("end_time", END_TIME)

# ──────────────────────────────────────────────────────────────
# μœ ν‹Έ/μΊμ‹œ
# ──────────────────────────────────────────────────────────────
DATA_CACHE  = {}  # dt -> (label, ir105, radar)
LINKS_CACHE = {}  # dt -> { "YYYY..._id": ["YYYY.. ._id", ...] }

def generate_timesteps(start_time, end_time, step_minutes=TIME_STEP):
    s = datetime.strptime(start_time, "%Y%m%d%H%M")
    e = datetime.strptime(end_time, "%Y%m%d%H%M")
    out, cur = [], s
    while cur <= e:
        out.append(cur.strftime("%Y%m%d%H%M"))
        cur += timedelta(minutes=step_minutes)
    return out

def safe_unique_labels(label_arr):
    """λΌλ²¨μ—μ„œ 0/NaN μ œκ±°ν•˜κ³  μ •μˆ˜ λ ˆμ΄λΈ” λ°°μ—΄ λ°˜ν™˜"""
    vals = np.unique(label_arr)
    if vals.dtype.kind == "f":
        vals = vals[np.isfinite(vals)]
    vals = vals[vals != 0]
    return vals.astype(np.int64)

def load_data(dt_str):
    day = dt_str[:8]
    lp  = os.path.join(LABEL_BASE, day, f"{dt_str}_label.nc")
    bp  = os.path.join(CONCAT_BT_BASE, day, f"concat_gk2a_radar_{dt_str}.npy")
    
    label, ir105, radar = None, None, None
    
    # 1. 라벨 데이터 λ‘œλ“œ (λ ˆμ΄λ” μœ λ¬΄μ™€ 관계없이 λ‘œλ“œ μ‹œλ„)
    if os.path.exists(lp):
        try:
            with xr.open_dataset(lp) as lds:
                label = lds["label"].values.copy()
        except Exception:
            pass

    # 2. BT/λ ˆμ΄λ”(.npy) 데이터 λ‘œλ“œ (μ—†κ±°λ‚˜ ν‚€κ°€ λˆ„λ½λ˜λ©΄ None μœ μ§€)
    if os.path.exists(bp):
        try:
            data = np.load(bp, allow_pickle=True).item()
            if isinstance(data, dict):
                ir105 = data.get("ir105", None)
                radar = data.get(RADAR_VAR, None)
        except Exception:
            pass

    return label, ir105, radar

def get_data(dt):
    if dt not in DATA_CACHE:
        DATA_CACHE[dt] = load_data(dt)
    return DATA_CACHE[dt]

def load_links(dt_str):
    """엄격 ν˜•μ‹: {"YYYYMMDDHHMM_id": ["YYYYMMDDHHMM_id", ...]}"""
    day = dt_str[:8]
    p   = os.path.join(LINKS_BASE, day, f"{dt_str}_links.pkl")
    if not os.path.exists(p):
        return {}
    try:
        with open(p, "rb") as f:
            d = pickle.load(f)
        return d if isinstance(d, dict) else {}
    except Exception:
        return {}

def get_links(dt):
    if dt not in LINKS_CACHE:
        LINKS_CACHE[dt] = load_links(dt)
    return LINKS_CACHE[dt]

def parse_cid_str(s):
    """'YYYYMMDDHHMM_id' β†’ (dt:str, id:int). ν˜•μ‹ 뢈일치 μ‹œ (None,None)"""
    if not isinstance(s, str) or "_" not in s:
        return (None, None)
    dt, nid = s.split("_", 1)
    try:
        return (dt, int(nid))
    except ValueError:
        return (None, None)

def make_cid(dt, cid_int):
    return f"{dt}_{int(cid_int)}"

# ──────────────────────────────────────────────────────────────
# 초기 ꡬ름 쑰건 체크
# ──────────────────────────────────────────────────────────────
def is_outside_radar_region(dt, cid_int):
    """κ΅¬λ¦„μ˜ λͺ¨λ“  픽셀이 λ ˆμ΄λ” μ˜μ—­ 밖에 μžˆλŠ”μ§€ 확인"""
    label, _, radar_data = get_data(dt)
    if label is None or radar_data is None:
        return False
    
    mask = (label == cid_int)
    if not np.any(mask):
        return False
    
    # ν΄λŸ¬μŠ€ν„° μ˜μ—­μ˜ λ ˆμ΄λ” κ°’ μΆ”μΆœ
    radar_values = radar_data[mask]
    valid_radar = radar_values[np.isfinite(radar_values)]
    
    # μœ νš¨ν•œ λ ˆμ΄λ” 값이 ν•˜λ‚˜λ„ μ—†μœΌλ©΄ λ ˆμ΄λ” μ˜μ—­ λ°–
    return len(valid_radar) == 0

def has_no_past_connection(dt, cid_int):
    """ν•΄λ‹Ή ꡬ름이 과거와 연결이 μ—†λŠ”μ§€ 확인 (졜초 생성 ꡬ름)"""
    links = get_links(dt)
    cid_key = make_cid(dt, cid_int)
    
    if cid_key not in links:
        return True
    
    past_connections = links[cid_key]
    return not past_connections or len(past_connections) == 0

def get_cluster_size(dt, cid_int):
    """ν΄λŸ¬μŠ€ν„°μ˜ ν”½μ…€ 수 λ°˜ν™˜"""
    label, _, _ = get_data(dt)
    if label is None:
        return 0
    
    mask = (label == cid_int)
    return np.sum(mask)

def is_initial_cloud_to_remove(dt, cid_int):
    """제거 λŒ€μƒ 초기 ꡬ름인지 확인"""
    if not has_no_past_connection(dt, cid_int):
        return False
    
    cluster_size = get_cluster_size(dt, cid_int)
    
    if is_outside_radar_region(dt, cid_int):
        return True
    if cluster_size >= MIN_SIZE_THRESHOLD:
        return True
    
    return False

# ──────────────────────────────────────────────────────────────
# μ„±μˆ™ 쑰건 체크
# ──────────────────────────────────────────────────────────────
def is_mature(dt, cid_int):
    """μ„±μˆ™ ꡬ름 쑰건 체크 (λ‹¨μˆœν™”)"""
    label, ir, radar_data = get_data(dt)
    if label is None or ir is None or radar_data is None:
        return False
        
    m = (label == cid_int)
    if not np.any(m):
        return False
    
    # 쑰건 1: BT 쑰건 체크
    v_ir = ir[m]
    v_ir = v_ir[np.isfinite(v_ir)]
    if len(v_ir) > 0 and np.nanmin(v_ir) <= MATURE_THRESHOLD:
        return True
    
    # 쑰건 2: λ ˆμ΄λ” μž„κ³„κ°’ 체크
    v_radar = radar_data[m]
    v_radar = v_radar[np.isfinite(v_radar)]
    if len(v_radar) > 0 and np.nanmax(v_radar) >= RADAR_THRESHOLD:
        return True
    
    return False

# ──────────────────────────────────────────────────────────────
# 후속(미래) ꡬ름 μ°ΎκΈ° / μˆ˜μ§‘
# ──────────────────────────────────────────────────────────────
def successors(prev_dt, prev_id, next_dt):
    links_next = get_links(next_dt)
    if not links_next:
        return []
    out = []
    for now_key, prev_list in links_next.items():
        now_dt, now_id = parse_cid_str(now_key)
        if now_dt is None or now_id is None:
            continue
        for pv in (prev_list or []):
            pv_dt, pv_id = parse_cid_str(pv)
            if pv_dt == prev_dt and pv_id == prev_id:
                out.append(now_id)
                break
    return out

def check_mature_cloud(dt, cid_int):
    return is_mature(dt, cid_int)

def collect_descendants_from(dt, cid_int, timesteps, max_minutes):
    out = set([make_cid(dt, cid_int)])
    if dt not in timesteps:
        return out
    start_idx = timesteps.index(dt)
    last_idx  = len(timesteps)-1

    q = deque()
    q.append((start_idx, cid_int))
    visited = set([(start_idx, cid_int)])

    while q:
        idx, cur_id = q.popleft()
        cur_dt = timesteps[idx]
        out.add(make_cid(cur_dt, cur_id))
        if idx == last_idx:
            continue
        next_dt = timesteps[idx+1]
        for nx_id in successors(cur_dt, cur_id, next_dt):
            st = (idx+1, nx_id)
            if st in visited:
                continue
            visited.add(st)
            q.append(st)
    return out

# ──────────────────────────────────────────────────────────────
# 메인
# ──────────────────────────────────────────────────────────────
def process_mature_cloud_masking(start_time=START_TIME, end_time=END_TIME):
    print(f"πŸš€ ꡬ름 λ§ˆμŠ€ν‚Ή (λ‹¨μˆœν™”λœ 쑰건): {start_time}~{end_time}")

    timesteps = generate_timesteps(start_time, end_time, TIME_STEP)
    print(f"\nπŸ” νƒ€μž„μŠ€ν…: {len(timesteps)}개, 제거 λ²”μœ„: {MAX_REMOVE_HOURS}h")
    print(f"πŸ“‹ λ§ˆμŠ€ν‚Ή 쑰건:")
    print(f"   1. BT ≀ {MATURE_THRESHOLD}K (졜초 μ‹œμ λΆ€ν„° 미래 전체)")
    print(f"   2. {RADAR_VAR.upper()} β‰₯ {RADAR_THRESHOLD}dBZ (졜초 μ‹œμ λΆ€ν„° 미래 전체)")
    print(f"   3. {RADAR_VAR.upper()} μ˜μ—­ λ°– + κ³Όκ±° μ—°κ²° μ—†μŒ (전체 생애주기)")
    print(f"   4. {MIN_SIZE_THRESHOLD}ν”½μ…€ 이상 + κ³Όκ±° μ—°κ²° μ—†μŒ (전체 생애주기)")

    remove_cids = set()
    initial_remove_count = 0
    mature_remove_count = 0

    # 1) 톡합 ꡬ름 필터링 (초기 + μ„±μˆ™)
    for dt in tqdm(timesteps, desc="ꡬ름 필터링"):
        label, ir, radar_data = get_data(dt)
        
        # 라벨이 μ•„μ˜ˆ μ—†μœΌλ©΄ κ±΄λ„ˆλœ€
        if label is None:
            continue
            
        # 데이터(IR λ˜λŠ” HSR)κ°€ μ—†μœΌλ©΄ ν•΄λ‹Ή νƒ€μž„μŠ€ν…μ˜ "μƒˆλ‘œμš΄ μ„±μˆ™ ꡬ름 νŒλ³„"은 패슀
        # 단, λ‹€λ₯Έ νƒ€μž„μŠ€ν…μ—μ„œ μˆ˜μ§‘λœ remove_cids μΆ”μ μ—λŠ” 영ν–₯ μ—†μŒ
        if ir is None or radar_data is None:
            continue

        for cid in safe_unique_labels(label):
            start_key = make_cid(dt, cid)
            if start_key in remove_cids:
                continue
                
            # 1) 초기 ꡬ름 체크 (μš°μ„ μˆœμœ„)
            if is_initial_cloud_to_remove(dt, cid):
                descendants = collect_descendants_from(dt, cid, timesteps, MAX_REMOVE_HOURS*60)
                remove_cids |= descendants
                initial_remove_count += len(descendants)
                
                cluster_size = get_cluster_size(dt, cid)
                is_outside_radar = is_outside_radar_region(dt, cid)
                reason = f"{RADAR_VAR.upper()}μ˜μ—­λ°–" if is_outside_radar else f"λŒ€ν˜•κ΅¬λ¦„({cluster_size}ν”½μ…€)"
                # print(f"   πŸ“ 초기 ꡬ름 제거: {dt}_{cid} ({reason}) β†’ {len(descendants)}개 후손")
                continue
                
            # 2) μ„±μˆ™ ꡬ름 체크
            if check_mature_cloud(dt, cid):
                mature_descendants = collect_descendants_from(dt, cid, timesteps, MAX_REMOVE_HOURS*60)
                remove_cids |= mature_descendants
                mature_remove_count += len(mature_descendants)
                
                # print(f"   ⚑ μ„±μˆ™ ꡬ름 제거: {dt}_{cid} (μ„±μˆ™μ‘°κ±΄) β†’ {len(mature_descendants)}개 미래 ν΄λŸ¬μŠ€ν„°")

    print(f"\nπŸ“Š 필터링 κ²°κ³Ό:")
    print(f"   - 초기 ꡬ름 제거: {initial_remove_count}개")
    print(f"   - μ„±μˆ™ ꡬ름 제거: {mature_remove_count}개")
    print(f"   - 총 제거 λŒ€μƒ: {len(remove_cids)}개")

    # 2) 라벨 파일 μ—…λ°μ΄νŠΈ/μ €μž₯
    for dt in tqdm(timesteps, desc="라벨 μ—…λ°μ΄νŠΈ"):
        label, _, _ = get_data(dt)
        
        # HSR 데이터 λˆ„λ½ 여뢀와 상관없이 라벨 파일이 μ‘΄μž¬ν•˜λ©΄ λ§ˆμŠ€ν‚Ή μ§„ν–‰
        if label is None:
            continue

        # 이 μ‹œκ°μ˜ 제거 λŒ€μƒ idλ“€ μΆ”μΆœ
        to_remove = []
        for key in remove_cids:
            kdt, kid = parse_cid_str(key)
            if kdt == dt and kid is not None:
                to_remove.append(kid)

        new_label = label.astype(float, copy=True)
        removed = 0
        for cid in to_remove:
            m = (label == cid)
            if np.any(m):
                new_label[m] = np.nan
                removed += 1

        # λͺ¨λ‘ 제거되면 μ €μž₯ μŠ€ν‚΅
        keep = new_label[np.isfinite(new_label)]
        keep = keep[keep != 0]
        if keep.size == 0:
            continue

        day = dt[:8]
        out_dir = os.path.join(SAVE_DIR, day)
        os.makedirs(out_dir, exist_ok=True)
        out_path = os.path.join(out_dir, f"{dt}_label.nc")
        xr.Dataset({"label": (["y","x"], new_label)}).to_netcdf(out_path)
        # print(f"   βœ… {dt}: {removed}개 제거 β†’ {out_path}")

    print("\nπŸŽ‰ μ™„λ£Œ: λ‹¨μˆœν™”λœ ꡬ름 λ§ˆμŠ€ν‚Ή (μ¦‰μ‹œ 쑰건 + 미래 후손 제거)")

if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Remove mature-cloud objects from CI labels.")
    parser.add_argument("--config", required=True, help="JSON configuration path")
    parser.add_argument("--device", default=None, help="Accepted for a common CLI; this stage runs on CPU")
    parser.add_argument("--output-dir", default=None, help="Override save_dir")
    args = parser.parse_args()
    config_path = os.path.abspath(args.config)
    RUN_DIR = os.path.dirname(config_path)
    cfg = load_config(config_path)
    if args.output_dir:
        cfg["output_dir"] = os.path.abspath(args.output_dir)
    apply_config(cfg)
    process_mature_cloud_masking(START_TIME, END_TIME)