import os
import requests
import csv
from datetime import datetime, timedelta

# 1. API 인증키 설정
def get_env_variable(var_name):
    if os.path.exists(".env"):
        with open(".env", "r") as f:
            for line in f:
                if "=" in line:
                    k, v = line.split("=", 1)
                    if k.strip() == var_name:
                        return v.strip()
    return os.getenv(var_name)

API_KEY = get_env_variable("WEATHER_KEY") or get_env_variable("KMA_API_KEY")

# 2. 좌표 설정
TARGET_LAT = 34.92470
TARGET_LON = 127.71207

# 3. 시점 로드
def load_target_times(file_path):
    times = []
    if not os.path.exists(file_path): return []
    with open(file_path, 'r') as f:
        for line in f:
            line = line.strip()
            if not line: continue
            try:
                dt = datetime.strptime(line, "%Y-%m-%d: %H:%M")
                times.append(dt)
            except ValueError: continue
    return times

target_times = load_target_times("visible-times.txt")

# 4. API 설정
BASE_URL = "https://apihub.kma.go.kr/api/typ01/url/sfc_nc_var.php"
OBS_ELEMENTS = "ta,hm,td,wd_10m,ws_10m,uu,vv,rn_ox,vs"
INTERVAL = 5 

def fetch_data(t_time):
    print(f"--- [{t_time.strftime('%Y-%m-%d %H:%M')}] 추출 중 ---")
    start_time = t_time - timedelta(hours=1)
    end_time = t_time + timedelta(hours=1)
    
    queries = [(start_time, t_time), (t_time + timedelta(minutes=INTERVAL), end_time)]
    extracted_data = []
    
    for tm1, tm2 in queries:
        params = {
            "tm1": tm1.strftime("%Y%m%d%H%M"),
            "tm2": tm2.strftime("%Y%m%d%H%M"),
            "obs": OBS_ELEMENTS,
            "itv": INTERVAL,
            "lon": TARGET_LON,
            "lat": TARGET_LAT,
            "help": 0,
            "authKey": API_KEY
        }
        try:
            response = requests.get(BASE_URL, params=params, timeout=30)
            response.raise_for_status()
            
            for line in response.text.strip().split('\n'):
                if line.startswith('#') or not line.strip(): continue
                parts = [p.strip() for p in line.replace(',', ' ').split()]
                if len(parts) >= 10:
                    extracted_data.append({
                        "tm": parts[0],
                        "ta": parts[1],
                        "hm": parts[2],
                        "td": parts[3],
                        "wd_10m": parts[4],
                        "ws_10m": parts[5],
                        "uu": parts[6],
                        "vv": parts[7],
                        "rn_ox": parts[8],
                        "vs": parts[9]
                    })
        except Exception as e: print(f"  Error: {e}")
            
    if extracted_data:
        extracted_data.sort(key=lambda x: x['tm'])
        filename = f"weather_data_{t_time.strftime('%Y%m%d_%H%M')}.csv"
        with open(filename, 'w', newline='', encoding='utf-8-sig') as f:
            writer = csv.DictWriter(f, fieldnames=extracted_data[0].keys())
            writer.writeheader()
            writer.writerows(extracted_data)
        print(f"  >> 저장됨: {filename} ({len(extracted_data)}개)")
    else:
        print(f"  >> 데이터 없음")

if __name__ == "__main__":
    for t in target_times: fetch_data(t)