from abc import ABC, abstractmethod
from typing import Tuple

from sqlalchemy import and_, select, func, update
from sqlalchemy.ext.asyncio import AsyncSession

from common.database.db_session_manager import DB_SESSION_MNG
from common.database.model.models import places, users
from common.enums import ErrorType
from common.logger import LOG
from common.utils.gtime import GTime


def _place_count_subquery():
    """계정 하나가 가진 사업장 수 — users 에 상관 서브쿼리로 얹는다(N+1 회피)."""
    return (
        select(func.count())
        .select_from(places)
        .where(places.owner_user_id == users.user_id, places.deleted == False)  # noqa: E712
        .correlate(users)
        .scalar_subquery()
    )


# CRUD 는 인터페이스(I*) 와 구현(*) 으로 분리한다.
class IUserCRUD(ABC):
    @abstractmethod
    async def get_user_by_login_id(self, cdb: AsyncSession, login_id: str) -> Tuple[ErrorType, users]:
        pass

    @abstractmethod
    async def get_user_by_provider_uid(self, cdb: AsyncSession, provider: int, provider_uid: str) -> Tuple[ErrorType, users]:
        pass

    @abstractmethod
    async def get_user_by_email(self, cdb: AsyncSession, email: str) -> Tuple[ErrorType, users]:
        pass

    @abstractmethod
    async def is_user(self, cdb: AsyncSession, login_id: str) -> ErrorType:
        pass

    @abstractmethod
    async def add_user(self, cdb: AsyncSession, user: users) -> ErrorType:
        pass

    @abstractmethod
    async def update_last_accessed(self, cdb: AsyncSession, user_id) -> ErrorType:
        pass

    @abstractmethod
    async def get_by_user_id(self, cdb: AsyncSession, user_id) -> Tuple[ErrorType, users]:
        pass

    @abstractmethod
    async def update_user(self, cdb: AsyncSession, user_id, data: dict) -> ErrorType:
        pass

    @abstractmethod
    async def list_users(
        self, cdb: AsyncSession, roles: list, skip: int, limit: int, search: str | None = None
    ) -> Tuple[ErrorType, list, int]:
        """내부 운영(DEVELOPER) 전용 전체 계정 목록."""
        pass


class UserCRUD(IUserCRUD):
    async def get_user_by_login_id(self, cdb: AsyncSession, login_id: str) -> Tuple[ErrorType, users]:
        try:
            query = select(users).where(users.id == login_id, users.deleted == False).limit(1)  # noqa: E712
            err_type, row_list = await DB_SESSION_MNG.execute(cdb, query, f"get_user_by_login_id(ID:{login_id}) failed.")
            if err_type != ErrorType.SUCCESS:
                return err_type, None
            if len(row_list) != 1:
                return ErrorType.DB_INVALID_KEY, None
            return ErrorType.SUCCESS, row_list[0]
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, None

    async def get_user_by_provider_uid(self, cdb: AsyncSession, provider: int, provider_uid: str) -> Tuple[ErrorType, users]:
        """소셜 계정 조회 키는 provider_uid(구글 sub) 다 — 이메일이 아니다."""
        try:
            query = (
                select(users)
                .where(users.provider == provider, users.provider_uid == provider_uid, users.deleted == False)  # noqa: E712
                .limit(1)
            )
            err_type, row_list = await DB_SESSION_MNG.execute(cdb, query, "get_user_by_provider_uid failed.")
            if err_type != ErrorType.SUCCESS:
                return err_type, None
            if len(row_list) != 1:
                return ErrorType.DB_INVALID_KEY, None
            return ErrorType.SUCCESS, row_list[0]
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, None

    async def get_user_by_email(self, cdb: AsyncSession, email: str) -> Tuple[ErrorType, users]:
        """이메일로 1건."""
        try:
            query = (
                select(users)
                .where(func.lower(users.email) == email.strip().lower(), users.deleted == False)  # noqa: E712
                .order_by(users.created_at.asc())
                .limit(1)
            )
            err_type, row_list = await DB_SESSION_MNG.execute(cdb, query, "get_user_by_email failed.")
            if err_type != ErrorType.SUCCESS:
                return err_type, None
            if len(row_list) != 1:
                return ErrorType.DB_INVALID_KEY, None
            return ErrorType.SUCCESS, row_list[0]
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, None

    async def is_user(self, cdb: AsyncSession, login_id: str) -> ErrorType:
        try:
            query = select(users).where(users.id == login_id, users.deleted == False).limit(1)  # noqa: E712
            err_type, row_list = await DB_SESSION_MNG.execute(cdb, query)
            if err_type != ErrorType.SUCCESS:
                return err_type
            if row_list:
                return ErrorType.DB_ALREADY_SAME_KEY
            return ErrorType.SUCCESS
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED

    async def add_user(self, cdb: AsyncSession, user: users) -> ErrorType:
        try:
            return await DB_SESSION_MNG.insert(cdb, user)
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED

    async def update_last_accessed(self, cdb: AsyncSession, user_id) -> ErrorType:
        try:
            query = update(users).where(users.user_id == user_id).values(last_accessed_at=GTime.UTC())
            return await DB_SESSION_MNG.add(cdb, query)
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED

    async def get_by_user_id(self, cdb: AsyncSession, user_id) -> Tuple[ErrorType, users]:
        try:
            query = select(users).where(users.user_id == user_id, users.deleted == False).limit(1)  # noqa: E712
            err_type, row_list = await DB_SESSION_MNG.execute(cdb, query)
            if err_type != ErrorType.SUCCESS:
                return err_type, None
            if len(row_list) != 1:
                return ErrorType.DB_INVALID_KEY, None
            return ErrorType.SUCCESS, row_list[0]
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, None

    async def update_user(self, cdb: AsyncSession, user_id, data: dict) -> ErrorType:
        try:
            if not data:
                return ErrorType.SUCCESS
            query = update(users).where(users.user_id == user_id).values(**data)
            return await DB_SESSION_MNG.add(cdb, query)
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED

    async def list_users(
        self, cdb: AsyncSession, roles: list, skip: int, limit: int, search: str | None = None
    ) -> Tuple[ErrorType, list, int]:
        """role 이 roles 안에 있는 계정만 본다 — 개발자 계정은 호출측이 roles 에서 뺀다 (UserRole 주석: "개발자 계정은 고객사에 존재를 노출하지 않는다" 원칙을 내부 화면에서도 지킨다)."""
        try:
            where = and_(users.deleted == False, users.role.in_(roles))  # noqa: E712
            if search:
                like = f"%{search.strip()}%"
                where = and_(where, (users.email.ilike(like) | users.name.ilike(like) | users.id.ilike(like)))

            cnt_err, cnt_rows = await DB_SESSION_MNG.execute(cdb, select(func.count()).select_from(users).where(where))
            if cnt_err != ErrorType.SUCCESS:
                return cnt_err, [], 0
            total = int(cnt_rows[0] or 0) if cnt_rows else 0

            query = (
                select(users, _place_count_subquery())
                .where(where)
                .order_by(users.created_at.desc())
                .offset(skip)
                .limit(limit)
            )
            list_err, rows = await DB_SESSION_MNG.execute(cdb, query)
            if list_err != ErrorType.SUCCESS:
                return list_err, [], 0
            return ErrorType.SUCCESS, list(rows), total
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, [], 0