from abc import ABC, abstractmethod
from typing import Optional, Tuple

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

from common.database.db_session_manager import DB_SESSION_MNG
from common.database.model.models import users, companies
from common.enums import ErrorType, UserRole
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 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_company(self, cdb: AsyncSession, company_id) -> Tuple[ErrorType, companies]:
        pass

    @abstractmethod
    async def update_company_settings(self, cdb: AsyncSession, company_id, settings: dict) -> ErrorType:
        pass

    @abstractmethod
    async def list_by_company(self, cdb: AsyncSession, company_id, search, skip, limit, hide_dev: bool = False) -> Tuple[ErrorType, list, int]:
        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 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_company(self, cdb: AsyncSession, company_id) -> Tuple[ErrorType, companies]:
        try:
            query = select(companies).where(companies.company_id == company_id, companies.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_company_settings(self, cdb: AsyncSession, company_id, settings: dict) -> ErrorType:
        try:
            query = (
                update(companies)
                .where(companies.company_id == company_id, companies.deleted == False)  # noqa: E712
                .values(settings=settings, updated_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 list_by_company(
        self, cdb: AsyncSession, company_id, search: Optional[str], skip: int, limit: int, hide_dev: bool = False
    ) -> Tuple[ErrorType, list, int]:
        try:
            conditions = [users.deleted == False, users.company_id == company_id]  # noqa: E712
            # 개발자(내부 운영) 계정은 고객사에 존재 자체가 보이면 안 된다 — 목록에서 빼고 총계에도 넣지 않는다.
            if hide_dev:
                conditions.append(users.role != UserRole.DEVELOPER.value)
            if search:
                conditions.append(
                    or_(
                        users.id.ilike(f"%{search}%"),
                        users.name.ilike(f"%{search}%"),
                        users.email.ilike(f"%{search}%"),
                    )
                )
            where = and_(*conditions)

            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

            list_err, rows = await DB_SESSION_MNG.execute(
                cdb,
                select(users).where(where).order_by(users.created_at.desc()).offset(skip).limit(limit),
            )
            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

    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