import pyodbc

# 선호 순서 — 앞쪽일수록 우선. 설치 환경마다 다를 수 있어 자동 탐지 후 선택.
_PREFERRED_DRIVERS = (
    "ODBC Driver 18 for SQL Server",
    "ODBC Driver 17 for SQL Server",
    "ODBC Driver 13 for SQL Server",
    "SQL Server Native Client 11.0",
    "SQL Server",
)


def _pick_driver() -> "str | None":
    """이 PC에 설치된 ODBC 드라이버 중 사용할 SQL Server 드라이버를 선택.
    선호 순서대로 먼저 찾고, 없으면 이름에 'SQL Server'가 포함된 아무 드라이버라도 사용."""
    available = pyodbc.drivers()
    for name in _PREFERRED_DRIVERS:
        if name in available:
            return name
    for name in available:
        if "SQL Server" in name:
            return name
    return None


class SQLClient:
    def __init__(self):
        self.conn   = None
        self.cursor = None

    def connect(self, server: str, database: str,
                username: str, password: str) -> bool:
        driver = _pick_driver()
        if driver is None:
            print("[DB] 연결 실패: 설치된 SQL Server ODBC 드라이버가 없습니다. "
                  "'ODBC Driver 18 for SQL Server'를 설치하세요.")
            self.conn = None
            return False
        try:
            conn_str = (
                f"DRIVER={{{driver}}};"
                f"SERVER={server};"
                f"DATABASE={database};"
                f"UID={username};"
                f"PWD={password};"
                f"TrustServerCertificate=yes;"
                f"Encrypt=optional;"
            )
            self.conn   = pyodbc.connect(conn_str, timeout=10)
            self.cursor = self.conn.cursor()
            print(f"[DB] 연결 성공: {server}/{database}  (드라이버: {driver})")
            return True
        except Exception as e:
            print(f"[DB] 연결 실패: {e}  (드라이버: {driver})")
            self.conn = None
            return False

    def disconnect(self):
        if self.cursor:
            self.cursor.close()
        if self.conn:
            self.conn.close()
        self.conn   = None
        self.cursor = None
        print("[DB] 연결 해제")

    def is_connected(self) -> bool:
        return self.conn is not None

    @staticmethod
    def _norm_id(value) -> str:
        return str(value).strip() if value is not None else ""

    def get_wk_results(self) -> list:
        """
        vi_AI_WK_Result 뷰 조회.
        반환: [{
            "article_id": ..., "machine_id": ..., "machine": ...,
            "work_start_date": ..., "work_start_time": ...,
        }, ...]
        """
        if not self.is_connected():
            return []
        try:
            self.cursor.execute("""
                SELECT ArticleID, MachineID, Machine,
                       WorkStartDate, WorkStartTime
                FROM vi_AI_WK_Result
                WHERE ArticleID IS NOT NULL
                ORDER BY ArticleID
            """)
            rows = self.cursor.fetchall()
            return [self._row_to_wk_result(row) for row in rows]
        except Exception as e:
            print(f"[DB] WK_Result 조회 실패: {e}")
            return []

    def get_wk_result_article_ids(self) -> list:
        """vi_AI_WK_Result에 있는 ArticleID 목록 (중복 제거, 순서 유지)."""
        seen = set()
        ids  = []
        for row in self.get_wk_results():
            norm = self._norm_id(row["article_id"])
            if norm and norm not in seen:
                seen.add(norm)
                ids.append(row["article_id"])
        return ids

    def get_wk_result_map(self) -> dict:
        """ArticleID(정규화) → WK_Result 행. 동일 ID가 여러 행이면 마지막 행 사용."""
        result = {}
        for row in self.get_wk_results():
            norm = self._norm_id(row["article_id"])
            if norm:
                result[norm] = row
        return result

    @staticmethod
    def _row_to_wk_result(row) -> dict:
        return {
            "article_id":      row[0],
            "machine_id":      row[1],
            "machine":         row[2],
            "work_start_date": row[3],
            "work_start_time": row[4],
        }

    @staticmethod
    def format_db_value(value) -> str:
        if value is None:
            return "—"
        if hasattr(value, "strftime"):
            if hasattr(value, "hour"):
                return value.strftime("%H:%M:%S")
            return value.strftime("%Y-%m-%d")
        text = str(value).strip()
        return text if text else "—"

    def get_reflector_list_ordered(self, article_ids: list) -> list:
        """article_ids 순서를 유지한 제품 목록 (PatMax 슬롯 순서용)."""
        if not article_ids:
            return []
        by_norm = {
            self._norm_id(item["article_id"]): item
            for item in self.get_reflector_list(article_ids=article_ids)
        }
        ordered = []
        for article_id in article_ids:
            item = by_norm.get(self._norm_id(article_id))
            if item is not None:
                ordered.append(item)
        return ordered

    def split_articles_by_wk(self, mes_selected_ids: "list | None" = None) -> tuple:
        """
        vi_AI_mt_Article 목록을 WK_Result 작업 대상 / 기타로 분류.
        반환: (active_list, inactive_list)
        """
        if mes_selected_ids is not None:
            if len(mes_selected_ids) == 0:
                return [], []
            all_items = self.get_reflector_list_ordered(mes_selected_ids)
        else:
            all_items = self.get_reflector_list()

        if not all_items:
            return [], []

        wk_norm = set(self.get_wk_result_map().keys())
        active = [
            item for item in all_items
            if self._norm_id(item["article_id"]) in wk_norm
        ]
        inactive = [
            item for item in all_items
            if self._norm_id(item["article_id"]) not in wk_norm
        ]
        return active, inactive

    def get_inspectable_articles(self, mes_selected_ids: "list | None" = None) -> list:
        """
        vi_AI_mt_Article ∩ vi_AI_WK_Result.
        mes_selected_ids 지정 시 관리자 MES 선택과도 교집합.
        """
        wk_ids = self.get_wk_result_article_ids()
        if not wk_ids:
            return []

        wk_by_norm = {self._norm_id(article_id): article_id for article_id in wk_ids}

        if mes_selected_ids is not None:
            if len(mes_selected_ids) == 0:
                return []
            filter_ids = [
                wk_by_norm[self._norm_id(article_id)]
                for article_id in mes_selected_ids
                if self._norm_id(article_id) in wk_by_norm
            ]
        else:
            filter_ids = wk_ids

        if not filter_ids:
            return []
        return self.get_reflector_list(article_ids=filter_ids)

    def get_all_articles(self) -> list:
        """
        vi_AI_mt_Article 뷰 전체 조회 (관리자 MES 제품 선택용).
        반환: [{"article_id": ..., "article": ..., "buyer_article_no": ...}, ...]
        """
        if not self.is_connected():
            return []
        try:
            self.cursor.execute("""
                SELECT ArticleID, Article, BuyerArticleNo
                FROM vi_AI_mt_Article
                ORDER BY ArticleID
            """)
            rows = self.cursor.fetchall()
            return [self._row_to_article(row) for row in rows]
        except Exception as e:
            print(f"[DB] 전체 제품 조회 실패: {e}")
            return []

    def get_reflector_list(self, article_ids: "list | None" = None) -> list:
        """
        vi_AI_mt_Article 뷰에서 제품 목록 조회.
        article_ids 지정 시 해당 ID만, 미지정 시 REF 포함 제품 전체.
        반환: [{"article_id": ..., "article": ..., "buyer_article_no": ...}, ...]
        """
        if not self.is_connected():
            return []
        try:
            if article_ids:
                placeholders = ",".join("?" * len(article_ids))
                self.cursor.execute(f"""
                    SELECT ArticleID, Article, BuyerArticleNo
                    FROM vi_AI_mt_Article
                    WHERE ArticleID IN ({placeholders})
                    ORDER BY ArticleID
                """, article_ids)
            else:
                self.cursor.execute("""
                    SELECT ArticleID, Article, BuyerArticleNo
                    FROM vi_AI_mt_Article
                    WHERE Article LIKE '%REF%'
                    ORDER BY ArticleID
                """)
            rows = self.cursor.fetchall()
            return [self._row_to_article(row) for row in rows]
        except Exception as e:
            print(f"[DB] 조회 실패: {e}")
            return []

    @staticmethod
    def _row_to_article(row) -> dict:
        return {
            "article_id":       row[0],
            "article":          row[1],
            "buyer_article_no": row[2],
        }

    def save_inspection_result(self, article_id: str,
                               result: str, score: float) -> bool:
        """검사 결과 저장 — 테이블 확정 후 구현."""
        # TODO: 결과 저장 테이블 확정 후 쿼리 구현
        print(f"[DB] 검사 결과 저장: {article_id} {result} {score}")
        return True