"""cafe24_db PostgreSQL 저장소.

- 드라이버: psycopg 3 (`psycopg[binary,pool]`) — 다른 모듈과 동일 패턴.
- 연결 정보: 환경변수 `CAFE24_DB_URL`
  (예: postgresql://cafe24_app:<pwd>@postgres-db:5432/cafe24_db)
- 스키마는 앱이 만들지 않는다. `scripts/sql/cafe24_db_init.sql` 을 superuser 가
  사전 적용한다. 앱 계정(cafe24_app)은 CRUD 권한만 받는다.
- 연결 풀은 lazy open — 부팅 시 DB 가 잠시 끊겨도 컨테이너가 죽지 않게.

토큰 값은 이 계층에 도달하기 전 이미 Fernet 암호문이다(평문 취급 금지).
API 로그에는 토큰/시크릿을 넣지 않는다.
"""

from __future__ import annotations

import logging
from contextlib import contextmanager
from datetime import date, datetime
from typing import Any, Iterator

from psycopg.rows import dict_row
from psycopg_pool import ConnectionPool

from app.timezone import KST

from . import store

logger = logging.getLogger("cafe24.db")

# save_token_row / TokenLock.save 에서 부분 갱신을 허용하는 컬럼 화이트리스트.
# 여기 없는 키는 무시한다(임의 컬럼 주입 방지).
_TOKEN_FIELDS: tuple[str, ...] = (
    "access_token",
    "refresh_token",
    "access_token_expires_at",
    "refresh_token_expires_at",
    "scopes",
    "last_refreshed_at",
    "last_error",
    "connected_by",
)


class TokenLock:
    """token_lock() 이 넘겨주는 핸들. 잠긴 행 조회 + 같은 트랜잭션 안 저장."""

    def __init__(self, conn: Any, mall_id: str, row: dict[str, Any] | None):
        self._conn = conn
        self._mall_id = mall_id
        self.row = row

    def save(self, **fields: Any) -> None:
        _update_token_row(self._conn, self._mall_id, fields)


def _update_token_row(conn: Any, mall_id: str, fields: dict[str, Any]) -> None:
    """UPSERT. 주어진 컬럼만 갱신한다(부분 갱신)."""
    allowed = {k: v for k, v in fields.items() if k in _TOKEN_FIELDS}
    if not allowed:
        return
    columns = list(allowed.keys())
    placeholders = ", ".join(["%s"] * len(columns))
    assignments = ", ".join(f"{col} = EXCLUDED.{col}" for col in columns)
    conn.execute(
        f"""
        INSERT INTO cafe24_oauth_tokens (mall_id, {", ".join(columns)})
        VALUES (%s, {placeholders})
        ON CONFLICT (mall_id) DO UPDATE SET {assignments}
        """,
        (mall_id, *[allowed[col] for col in columns]),
    )


class Cafe24Store:
    def __init__(self, dsn: str, *, min_size: int = 1, max_size: int = 5):
        self._pool = ConnectionPool(
            conninfo=dsn,
            min_size=min_size,
            max_size=max_size,
            kwargs={"row_factory": dict_row, "autocommit": True},
            open=False,
        )
        self._pool.open(wait=False)

    def close(self) -> None:
        self._pool.close()

    # ════════════════════════════════════════════════════════════
    # OAuth 토큰 — app/integrations/cafe24/tokens.py 가 요구하는 3개 메서드
    # ════════════════════════════════════════════════════════════
    def get_token_row(self, mall_id: str) -> dict[str, Any] | None:
        with self._pool.connection() as conn:
            return conn.execute(
                "SELECT * FROM cafe24_oauth_tokens WHERE mall_id = %s",
                (mall_id,),
            ).fetchone()

    def save_token_row(self, *, mall_id: str, **fields: Any) -> None:
        with self._pool.connection() as conn:
            _update_token_row(conn, mall_id, fields)

    @contextmanager
    def token_lock(self, mall_id: str) -> Iterator[TokenLock]:
        """토큰 행을 FOR UPDATE 로 잠근 채 작업.

        web 컨테이너와 worker 컨테이너가 동시에 refresh 하는 것을 막는다
        (카페24는 refresh token 을 회전시키므로 동시 갱신 시 한쪽이 무효화됨).
        행이 아직 없으면 row=None 으로 넘어간다.
        """
        with self._pool.connection() as conn:
            with conn.transaction():
                row = conn.execute(
                    "SELECT * FROM cafe24_oauth_tokens WHERE mall_id = %s FOR UPDATE",
                    (mall_id,),
                ).fetchone()
                yield TokenLock(conn, mall_id, row)

    def disconnect(self, mall_id: str) -> None:
        """연결 해제 — 토큰만 지운다(이력/예약은 보존)."""
        with self._pool.connection() as conn:
            conn.execute("DELETE FROM cafe24_oauth_tokens WHERE mall_id = %s", (mall_id,))

    # ════════════════════════════════════════════════════════════
    # API 호출 로그 (Cafe24Client 가 주입받아 호출)
    # ⚠️ Authorization/토큰/시크릿은 절대 기록하지 않는다.
    # ════════════════════════════════════════════════════════════
    def log_api_call(
        self,
        *,
        endpoint: str,
        method: str,
        product_no: int | None,
        http_status: int | None,
        result: str,
        error_message: str,
        duration_ms: int,
    ) -> None:
        with self._pool.connection() as conn:
            conn.execute(
                """
                INSERT INTO cafe24_api_logs
                    (endpoint, method, product_no, http_status, result, error_message, duration_ms)
                VALUES (%s,%s,%s,%s,%s,%s,%s)
                """,
                (endpoint, method, product_no, http_status, result, error_message, duration_ms),
            )

    def list_api_logs(self, *, limit: int = 100) -> list[dict[str, Any]]:
        with self._pool.connection() as conn:
            rows = conn.execute(
                """
                SELECT * FROM cafe24_api_logs
                ORDER BY created_at DESC, id DESC
                LIMIT %s
                """,
                (max(1, min(int(limit), 500)),),
            ).fetchall()
        return [self._serialize(r) for r in rows]

    # ════════════════════════════════════════════════════════════
    # 작업 감사 로그
    # ════════════════════════════════════════════════════════════
    def log_audit(
        self,
        *,
        actor: str,
        action: str,
        product_no: int | None = None,
        revision_id: int | None = None,
        schedule_id: int | None = None,
        result: str = "",
        detail: str = "",
    ) -> None:
        with self._pool.connection() as conn:
            self._insert_audit(
                conn,
                actor=actor,
                action=action,
                product_no=product_no,
                revision_id=revision_id,
                schedule_id=schedule_id,
                result=result,
                detail=detail,
            )

    @staticmethod
    def _insert_audit(
        conn: Any,
        *,
        actor: str,
        action: str,
        product_no: int | None = None,
        revision_id: int | None = None,
        schedule_id: int | None = None,
        result: str = "",
        detail: str = "",
    ) -> None:
        """호출자의 트랜잭션에 합류시키기 위해 conn 을 받는 정적 헬퍼."""
        conn.execute(
            """
            INSERT INTO cafe24_audit_logs
                (actor, action, product_no, revision_id, schedule_id, result, detail)
            VALUES (%s,%s,%s,%s,%s,%s,%s)
            """,
            (actor, action, product_no, revision_id, schedule_id, result, detail[:1000]),
        )

    def list_audit_logs(self, *, limit: int = 100) -> list[dict[str, Any]]:
        with self._pool.connection() as conn:
            rows = conn.execute(
                """
                SELECT * FROM cafe24_audit_logs
                ORDER BY created_at DESC, id DESC
                LIMIT %s
                """,
                (max(1, min(int(limit), 500)),),
            ).fetchall()
        return [self._serialize(r) for r in rows]

    # ════════════════════════════════════════════════════════════
    # 상품 캐시
    # source of truth 는 언제나 카페24다. 이 표는 목록 조회 결과를 담아두는
    # 곳이며, 예약·로그 화면에서 API 호출 없이 상품명을 보여줄 때 쓴다.
    # 상세설명(HTML)은 여기 넣지 않는다(cafe24_product_revisions 담당).
    # ════════════════════════════════════════════════════════════
    def upsert_products(self, rows: list[dict[str, Any]]) -> int:
        """정규화된 상품 dict 목록(products.normalize_product 결과)을 UPSERT."""
        valid = [r for r in rows if int(r.get("product_no") or 0) > 0]
        if not valid:
            return 0
        with self._pool.connection() as conn:
            with conn.cursor() as cur:
                cur.executemany(
                    """
                    INSERT INTO cafe24_products
                        (product_no, product_code, product_name, display, selling, last_synced_at)
                    VALUES (%s,%s,%s,%s,%s, now())
                    ON CONFLICT (product_no) DO UPDATE SET
                        product_code   = EXCLUDED.product_code,
                        product_name   = EXCLUDED.product_name,
                        display        = EXCLUDED.display,
                        selling        = EXCLUDED.selling,
                        last_synced_at = now()
                    """,
                    [
                        (
                            int(r["product_no"]),
                            str(r.get("product_code") or ""),
                            str(r.get("product_name") or ""),
                            bool(r.get("display", True)),
                            bool(r.get("selling", True)),
                        )
                        for r in valid
                    ],
                )
        return len(valid)

    def get_cached_product(self, product_no: int) -> dict[str, Any]:
        with self._pool.connection() as conn:
            row = conn.execute(
                "SELECT * FROM cafe24_products WHERE product_no = %s",
                (int(product_no),),
            ).fetchone()
        return self._serialize(row)

    # ════════════════════════════════════════════════════════════
    # 직렬화 — datetime → KST ISO, date → ISO (다른 모듈과 동일)
    # ════════════════════════════════════════════════════════════
    @staticmethod
    def _serialize(row: dict[str, Any] | None) -> dict[str, Any]:
        if not row:
            return {}
        out = dict(row)
        for key, value in list(out.items()):
            if isinstance(value, datetime):
                aware = value if value.tzinfo else value.replace(tzinfo=KST)
                out[key] = aware.astimezone(KST).isoformat(timespec="seconds")
            elif isinstance(value, date):
                out[key] = value.isoformat()
        return out


__all__ = ["Cafe24Store", "TokenLock", "store"]