from lexorank import lexorank
from sqlalchemy import select, insert, update, delete
from sqlalchemy.orm import selectinload

from models import CardService as DealServiceModel, User, Card, CardProduct, Product, GroupBillRequest
from models.card_group import CardGroup, card_relations
from schemas.group import *
from services.base import BaseService
from services.card import CardsService


class CardGroupService(BaseService):
    async def get_cards_by_group_id(self, group_id) -> list[Card]:
        group: CardGroup | None = await self.session.scalar(
            select(CardGroup)
            .where(CardGroup.id == group_id)
            .options(
                selectinload(CardGroup.cards).selectinload(Card.products).selectinload(CardProduct.services),
                selectinload(CardGroup.cards).selectinload(Card.products)
                .selectinload(CardProduct.product).selectinload(Product.barcodes),
                selectinload(CardGroup.cards).selectinload(Card.services).selectinload(DealServiceModel.service),
                selectinload(CardGroup.cards).selectinload(Card.status_history),
                selectinload(CardGroup.cards).selectinload(Card.group).selectinload(CardGroup.cards),
                selectinload(CardGroup.cards).joinedload(Card.client),
                selectinload(CardGroup.cards).joinedload(Card.shipping_warehouse),
            )
        )
        return group.cards if group else []

    async def create_group_model(self) -> CardGroup:
        group = CardGroup(
            name='',
            lexorank=lexorank.middle(lexorank.Bucket.BUCEKT_0).__str__(),
        )
        self.session.add(group)
        await self.session.flush()
        return group

    async def create_group(self, user: User, request: CreateCardGroupRequest) -> CardCreateGroupResponse:
        try:
            group = await self.create_group_model()

            for card_id in [request.dragging_card_id, request.hovered_card_id]:
                insert_stmt = insert(card_relations).values({
                    'card_id': card_id,
                    'group_id': group.id
                })
                await self.session.execute(insert_stmt)
            # changing status if needed on draggable card
            dragging_card = await self.session.scalar(
                select(Card).where(Card.id == request.dragging_card_id)
            )
            dropped_card = await self.session.scalar(
                select(Card).where(Card.id == request.hovered_card_id)
            )
            if dragging_card.current_status_id != dropped_card.current_status_id:
                card_service = CardsService(self.session)
                await card_service.change_status(dragging_card, dropped_card.current_status_id, user)
            await self.session.commit()
            return CardCreateGroupResponse(ok=True, message="Группа успешно создана")
        except Exception as e:
            return CardCreateGroupResponse(ok=False, message=str(e))

    async def update_group(self, request: CardGroupUpdateRequest) -> CardGroupUpdateResponse:
        try:
            group = await self.session.scalar(
                select(CardGroup).where(CardGroup.id == request.data.id)
            )
            if not group:
                return CardGroupUpdateResponse(ok=False, message="Группа не найдена")

            update_stmt = (
                update(CardGroup)
                .where(CardGroup.id == request.data.id)
                .values(name=request.data.name, lexorank=request.data.lexorank)
            )
            await self.session.execute(update_stmt)
            await self.session.commit()
            return CardGroupUpdateResponse(ok=True, message="Группа успешно обновлена")
        except Exception as e:
            print(e)
            await self.session.rollback()
            return CardGroupUpdateResponse(ok=False, message=str(e))

    async def complete_group(self, group_id: int) -> list[Card]:
        cards = await self.get_cards_by_group_id(group_id)
        for card in cards:
            card.is_completed = True
        return cards

    async def delete_group(self, group_id: int) -> None:
        cards = await self.get_cards_by_group_id(group_id)
        for card in cards:
            card.is_deleted = True
        await self.session.commit()

    async def change_group_status(
            self,
            user: User,
            request: CardGroupChangeStatusRequest,
    ) -> CardGroupChangeStatusResponse:
        try:
            # getting all cards in group
            cards = await self.session.scalars(
                select(card_relations.c.card_id)
                .where(card_relations.c.group_id == request.group_id)
            )

            card_service = CardsService(self.session)
            for card_id in cards:
                card = await self.session.scalar(
                    select(Card).where(Card.id == card_id)
                )
                await card_service.change_status(card, request.new_status, user)
            await self.session.commit()
            return CardGroupChangeStatusResponse(ok=True, message="Статус группы успешно изменен")
        except Exception as e:
            await self.session.rollback()
            return CardGroupChangeStatusResponse(ok=False, message=str(e))

    async def add_card(self, user: User, request: CardAddToGroupRequest) -> CardAddToGroupResponse:
        try:
            group_bill_request = await self.session.get(GroupBillRequest, request.group_id)
            if group_bill_request:
                raise Exception("Нельзя добавить сделку, так как на группу выставлен счёт.")

            # changing status if needed
            card_id = await self.session.scalar(
                select(card_relations.c.card_id)
                .where(card_relations.c.group_id == request.group_id)
            )
            group_card_status = await self.session.scalar(
                select(Card.current_status_id)
                .where(Card.id == card_id)
            )
            request_card = await self.session.scalar(
                select(Card).where(Card.id == request.card_id)
            )
            if group_card_status != request_card.current_status_id:
                await CardsService(self.session).change_status(request_card, group_card_status, user)
            insert_stmt = insert(card_relations).values({
                'card_id': request.card_id,
                'group_id': request.group_id
            })
            await self.session.execute(insert_stmt)
            await self.session.commit()

            return CardAddToGroupResponse(ok=True, message="Сделка успешно добавлена в группу")
        except Exception as e:
            await self.session.rollback()
            return CardAddToGroupResponse(ok=False, message=str(e))

    async def remove_card(self, request: CardRemoveFromGroupRequest) -> CardRemoveFromGroupResponse:
        try:
            delete_stmt = (
                delete(card_relations)
                .where(
                    card_relations.c.card_id == request.card_id,
                )
            )
            await self.session.execute(delete_stmt)
            await self.session.commit()
            return CardRemoveFromGroupResponse(ok=True, message="Сделка успешно удалена из группы")
        except Exception as e:
            await self.session.rollback()
            return CardRemoveFromGroupResponse(ok=False, message=str(e))