from abc import ABC, abstractmethod
from typing import Tuple

from sqlalchemy import 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 users
from common.enums import ErrorType
from common.logger import LOG
from common.utils.gtime import GTime


# CRUD 는 인터페이스(I*) 와 구현(*) 으로 분리한다.
# - service 는 인터페이스 타입에 의존하고 Depends 로 구현을 주입받는다 (테스트/교체 용이).
# - 모든 메서드는 (session, ...) 을 받는다. session 은 람다 호출 시 매니저가 넘겨준다.
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


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.
        구글은 이메일 변경을 허용하고, 이메일로 찾으면 그때 같은 사람에게 계정이 하나 더 생긴다."""
        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. "이미 다른 수단으로 가입돼 있다" 판정에만 쓴다.
        이메일에는 유니크 제약이 없다(옛 데이터) — 여러 건이면 가장 먼저 만들어진 것을 본다."""
        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