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


# 협력사 CRUD. 모든 조회/변경은 company_id 로 스코프된다(멀티테넌트).
class ISupplierCRUD(ABC):
    @abstractmethod
    async def search(self, cdb: AsyncSession, company_id, search, skip, limit) -> Tuple[ErrorType, list, int]:
        pass

    @abstractmethod
    async def code_exists(self, cdb: AsyncSession, company_id, code) -> Tuple[ErrorType, bool]:
        pass

    @abstractmethod
    async def existing_codes(self, cdb: AsyncSession, company_id, codes: list) -> Tuple[ErrorType, list]:
        pass

    @abstractmethod
    async def get_by_id(self, cdb: AsyncSession, supplier_id) -> Tuple[ErrorType, suppliers]:
        pass

    @abstractmethod
    async def add_supplier(self, cdb: AsyncSession, supplier: suppliers) -> ErrorType:
        pass

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

    @abstractmethod
    async def soft_delete(self, cdb: AsyncSession, supplier_id) -> ErrorType:
        pass

    @abstractmethod
    async def user_name_map(self, cdb: AsyncSession, user_ids) -> Tuple[ErrorType, dict]:
        pass


class SupplierCRUD(ISupplierCRUD):
    async def search(
        self, cdb: AsyncSession, company_id, search: Optional[str], skip: int, limit: int
    ) -> Tuple[ErrorType, list, int]:
        try:
            conditions = [suppliers.deleted == False, suppliers.company_id == company_id]  # noqa: E712
            if search:
                conditions.append(
                    or_(
                        suppliers.name.ilike(f"%{search}%"),
                        suppliers.code.ilike(f"%{search}%"),
                        suppliers.manager_name.ilike(f"%{search}%"),
                    )
                )
            where = and_(*conditions)

            cnt_err, cnt_rows = await DB_SESSION_MNG.execute(cdb, select(func.count()).select_from(suppliers).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(suppliers).where(where).order_by(suppliers.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 code_exists(self, cdb: AsyncSession, company_id, code) -> Tuple[ErrorType, bool]:
        try:
            query = select(func.count()).select_from(suppliers).where(
                suppliers.company_id == company_id,
                suppliers.code == code,
                suppliers.deleted == False,  # noqa: E712
            )
            err_type, rows = await DB_SESSION_MNG.execute(cdb, query)
            if err_type != ErrorType.SUCCESS:
                return err_type, False
            cnt = int(rows[0] or 0) if rows else 0
            return ErrorType.SUCCESS, cnt > 0
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, False

    async def existing_codes(self, cdb: AsyncSession, company_id, codes: list) -> Tuple[ErrorType, list]:
        try:
            if not codes:
                return ErrorType.SUCCESS, []
            query = select(suppliers.code).where(
                suppliers.company_id == company_id,
                suppliers.code.in_(codes),
                suppliers.deleted == False,  # noqa: E712
            )
            err_type, rows = await DB_SESSION_MNG.execute(cdb, query)
            if err_type != ErrorType.SUCCESS:
                return err_type, []
            return ErrorType.SUCCESS, [c for c in rows if c is not None]
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, []

    async def get_by_id(self, cdb: AsyncSession, supplier_id) -> Tuple[ErrorType, suppliers]:
        try:
            query = select(suppliers).where(suppliers.supplier_id == supplier_id, suppliers.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 add_supplier(self, cdb: AsyncSession, supplier: suppliers) -> ErrorType:
        try:
            return await DB_SESSION_MNG.insert(cdb, supplier)
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED

    async def update_supplier(self, cdb: AsyncSession, supplier_id, data: dict) -> ErrorType:
        try:
            if not data:
                return ErrorType.SUCCESS
            query = update(suppliers).where(suppliers.supplier_id == supplier_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 soft_delete(self, cdb: AsyncSession, supplier_id) -> ErrorType:
        try:
            query = update(suppliers).where(suppliers.supplier_id == supplier_id).values(deleted=True, 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 user_name_map(self, cdb: AsyncSession, user_ids) -> Tuple[ErrorType, dict]:
        """user_id 목록 → {user_id: name}. 협력사 목록/상세 '등록자(작성자)' 표기용(company.users 조인)."""
        try:
            if not user_ids:
                return ErrorType.SUCCESS, {}
            query = select(users.user_id, users.name).where(users.user_id.in_(user_ids))
            err_type, rows = await DB_SESSION_MNG.execute(cdb, query)
            if err_type != ErrorType.SUCCESS:
                return err_type, {}
            return ErrorType.SUCCESS, {uid: name for uid, name in rows}
        except Exception as ex:
            LOG.e_no_callstack(ex)
            return ErrorType.DB_RUN_FAILED, {}