# weatherFileUpdate.py

import os
import csv
import sys
from datetime import datetime
from sqlalchemy import select, and_

# 경로 설정
sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))
from conf import db, db_schema

CSV_FILENAME = 'weather.csv'  # 데이터 파일명
CSV_PATH = os.path.join(os.path.dirname(__file__), '../data', CSV_FILENAME)

weather_table = db_schema.fg_manager_static_weather

STN_ID = 99  # 고정된 stnId

def parse_float(value):
    try:
        f = float(value)
        return f if f == f else 0.0  # NaN 체크, NaN일 경우 0.0
    except (ValueError, TypeError):
        return 0.0

def load_csv(filepath):
    rows = []
    try:
        with open(filepath, newline='', encoding='utf-8') as csvfile:
            reader = csv.DictReader(csvfile)
            for row in reader:
                try:
                    date = datetime.strptime(row['날짜'], '%Y-%m-%d').date()

                    data = {
                        'date': date,
                        'stnId': STN_ID,
                        'minTa': parse_float(row.get('최저기온', 0)),
                        'maxTa': parse_float(row.get('최고기온', 0)),
                        'sumRn': parse_float(row.get('일강수량\n(mm)', 0)),
                        'avgWs': parse_float(row.get('평균풍속\n(m/s)', 0)),
                        'avgRhm': parse_float(row.get('습도', 0)),
                    }

                    rows.append(data)
                except Exception as e:
                    print(f"[WARN] 잘못된 행 건너뜀: {row} / 오류: {e}")
    except FileNotFoundError:
        print(f"[ERROR] 파일이 존재하지 않음: {filepath}")
        sys.exit(1)

    return rows

def row_exists(session, date, stnId):
    stmt = select(weather_table.c.date).where(
        and_(
            weather_table.c.date == date,
            weather_table.c.stnId == stnId
        )
    )
    return session.execute(stmt).scalar() is not None

def insert_rows(rows):
    inserted = 0
    skipped = 0
    session = db.get_session()
    try:
        for row in rows:
            if row_exists(session, row['date'], row['stnId']):
                skipped += 1
                continue
            session.execute(weather_table.insert().values(**row))
            inserted += 1
        session.commit()
    except Exception as e:
        session.rollback()
        print(f"[ERROR] DB 삽입 실패: {e}")
    finally:
        session.close()
    return inserted, skipped

def main():
    print(f"[INFO] CSV 파일 로드: {CSV_PATH}")
    rows = load_csv(CSV_PATH)
    print(f"[INFO] 총 행 수: {len(rows)}")

    if not rows:
        print("[WARN] 삽입할 데이터가 없습니다.")
        return

    inserted, skipped = insert_rows(rows)
    print(f"[DONE] 삽입 완료: {inserted}건, 건너뜀: {skipped}건")

if __name__ == "__main__":
    main()