import os
import sys
import pandas as pd
import shutil
from datetime import datetime
from sqlalchemy import Table, MetaData
from sqlalchemy.dialects.mysql import insert as mysql_insert
from sqlalchemy.exc import SQLAlchemyError

sys.path.append(os.path.abspath(os.path.join(os.path.dirname(__file__), '..')))

from lib.common import get_logger
from conf import db, db_schema  # get_engine, get_session 포함

logger = get_logger("POS_UPS")

DATA_DIR = os.path.abspath(os.path.join(os.path.dirname(__file__), "../data"))
FINISH_DIR = os.path.join(DATA_DIR, "finish")
os.makedirs(FINISH_DIR, exist_ok=True)


def nan_to_none(value):
    import pandas as pd
    if pd.isna(value):
        return None
    return value


def load_excel_data(filepath: str):
    df = pd.read_excel(filepath, header=1)  # 2행이 header, 3행부터 데이터
    # 컬럼명 공백 제거 등 정리
    df.columns = [col.strip() for col in df.columns]
    # 필수 컬럼 체크
    required_cols = ['영수증 번호', '품목명']
    for col in required_cols:
        if col not in df.columns:
            raise ValueError(f"필수 컬럼 누락: {col}")
    df = df.dropna(subset=required_cols)
    return df


def process_file(filepath: str, engine, session, table):
    try:
        df = load_excel_data(filepath)
        logger.info(f"[LOAD] {os.path.basename(filepath)} - {len(df)}건")

        inserted, updated, errors = 0, 0, 0

        for idx, row in df.iterrows():
            data = None  # 미리 초기화
            try:
                data = {
                    "sale_date": pd.to_datetime(row["매출일시"]),
                    "shop_name": str(row["매장명"]).strip(),
                    "pos_no": str(row["포스"]).strip(),
                    "bill_no": str(row["영수증 번호"]).strip(),
                    "product_cd": str(row["품목"]).strip(),
                    "product_name": str(row["품목명"]).strip(),
                    "qty": int(row["수량"]),

                    "ca01": nan_to_none(row.get("대분류", None)),
                    "ca02": nan_to_none(row.get("중분류", None)),
                    "ca03": nan_to_none(row.get("소분류", None)),
                    "barcode": nan_to_none(row.get("바코드", None)),
                    "amt": int(row.get("단가", 0)),
                    "tot_sale_amt": int(row.get("주문 금액", 0)),
                    "dc_amt": int(row.get("할인 금액", 0)),
                    "dcm_sale_amt": int(row.get("공급가액", 0)),
                    "vat_amt": int(row.get("세금", 0)),
                    "net_amt": int(row.get("결제 금액", 0)),
                    "cash_receipt": int(row.get("현금영수증", 0)),
                    "card": int(row.get("카드", 0)),
                }


                stmt = mysql_insert(table).values(**data)
                update_cols = {col.name: stmt.inserted[col.name] for col in table.columns
                               if col.name not in ['sale_date', 'shop_name', 'pos_no', 'bill_no', 'product_cd']}
                upsert_stmt = stmt.on_duplicate_key_update(update_cols)

                result = session.execute(upsert_stmt)

                if result.rowcount == 1:
                    inserted += 1
                elif result.rowcount == 2:
                    updated += 1

            except Exception as e:
                if data is not None:
                    logger.warning(f"[ERROR:ROW] {e} / 데이터: {data}")
                else:
                    logger.warning(f"[ERROR:ROW] {e} / 데이터가 생성되지 않음")
                errors += 1

            if (idx + 1) % 1000 == 0:
                logger.info(f"[PROGRESS] {idx + 1} / {len(df)} 처리 중...")

        session.commit()
        logger.info(f"[DONE] 삽입: {inserted}, 업데이트: {updated}, 오류: {errors}")

        shutil.move(filepath, os.path.join(FINISH_DIR, os.path.basename(filepath)))
        logger.info(f"[MOVE] 완료: {os.path.join(FINISH_DIR, os.path.basename(filepath))}")

    except Exception as e:
        logger.error(f"[FAIL] 파일 처리 중 오류 발생 - {e}")
        session.rollback()


def main():
    engine = db.get_engine()
    session = db.get_session()

    metadata = MetaData()
    table = Table(
        db_schema.get_full_table_name("pos_ups_billdata"),
        metadata,
        autoload_with=engine
    )

    files = [os.path.join(DATA_DIR, f) for f in os.listdir(DATA_DIR)
             if f.endswith(".xlsx") and f.startswith("영수증별 상세매출")]

    logger.info(f"[INFO] 처리할 파일 {len(files)}개")

    for file in sorted(files):
        logger.info(f"[START] {os.path.basename(file)}")
        process_file(file, engine, session, table)


if __name__ == "__main__":
    main()