from sqlalchemy import func
from sqlalchemy.orm import joinedload, selectinload

from models import Deal, Board, DealStatusHistory
from modules.fulfillment_base.models import (
    DealService,
    Service,
    DealProductService,
    DealProduct,
)
from repositories.mixins import *
from schemas.base import SortDir
from schemas.deal import UpdateDealSchema, CreateDealSchema
from utils.sorting import apply_sorting


class DealRepository(
    BaseRepository,
    RepDeleteMixin[Deal],
    RepCreateMixin[Deal, CreateDealSchema],
    RepUpdateMixin[Deal, UpdateDealSchema],
    RepGetByIdMixin[Deal],
):
    entity_class = Deal
    entity_not_found_msg = "Сделка не найдена"

    def _get_price_subquery(self):
        deal_services_subquery = (
            select(
                DealService.deal_id,
                func.sum(DealService.quantity * DealService.price).label("total_price"),
            )
            .join(Service)
            .group_by(DealService.deal_id)
        )
        product_services_subquery = select(
            select(
                DealProductService.deal_id,
                func.sum(DealProduct.quantity * DealProductService.price).label(
                    "total_price"
                ),
            )
            .join(DealProduct)
            .group_by(DealProductService.deal_id)
            .subquery()
        )
        union_subqueries = deal_services_subquery.union_all(
            product_services_subquery
        ).subquery()
        final_subquery = (
            select(
                union_subqueries.c.deal_id,
                func.sum(union_subqueries.c.total_price).label("total_price"),
            )
            .group_by(union_subqueries.c.deal_id)
            .subquery()
        )
        return final_subquery

    def _get_products_quantity_subquery(self):
        return (
            select(
                DealProduct.deal_id,
                func.sum(DealProduct.quantity).label("products_quantity"),
            )
            .group_by(DealProduct.deal_id)
            .subquery()
        )

    async def get_all(
        self,
        page: Optional[int],
        items_per_page: Optional[int],
        field: Optional[str],
        direction: Optional[SortDir],
        project_id: Optional[int],
        board_id: Optional[int],
        status_id: Optional[int],
        id: Optional[int],
        name: Optional[str],
    ) -> tuple[list[tuple[Deal, int, int]], int]:
        price_subquery = self._get_price_subquery()
        products_quantity_subquery = self._get_products_quantity_subquery()
        stmt = (
            select(
                Deal,
                func.coalesce(price_subquery.c.total_price, 0),
                func.coalesce(products_quantity_subquery.c.products_quantity, 0),
            )
            .outerjoin(
                price_subquery,
                Deal.id == price_subquery.c.deal_id,
            )
            .outerjoin(
                products_quantity_subquery,
                Deal.id == products_quantity_subquery.c.deal_id,
            )
            .options(
                joinedload(Deal.status),
                joinedload(Deal.board),
                selectinload(Deal.group),
                selectinload(Deal.tags),
            )
            .where(Deal.is_deleted.is_(False))
        )

        if id:
            stmt = stmt.where(Deal.id == id)
        if project_id:
            stmt = stmt.join(Board).where(Board.project_id == project_id)
        if board_id:
            stmt = stmt.where(Deal.board_id == board_id)
        if status_id:
            stmt = stmt.where(Deal.status_id == status_id)
        if name:
            stmt = stmt.where(Deal.name.ilike(f"%{name}%"))

        total_items = len((await self.session.execute(stmt)).all())

        if field and direction is not None:
            stmt = apply_sorting(stmt, Deal, field, direction)
        else:
            stmt = stmt.order_by(Deal.lexorank)

        if page and items_per_page:
            stmt = self._apply_pagination(stmt, page, items_per_page)

        rows: list[tuple[Deal, int, int]] = (await self.session.execute(stmt)).all()
        return rows, total_items

    async def get_by_group_id(self, group_id: int) -> list[Deal]:
        stmt = (
            select(Deal)
            .where(Deal.group_id == group_id, Deal.is_deleted.is_(False))
            .options(joinedload(Deal.status), joinedload(Deal.board))
        )
        result = await self.session.execute(stmt)
        return list(result.scalars().all())

    async def get_by_ids(self, deal_ids: list[int]) -> list[Deal]:
        stmt = (
            select(Deal)
            .where(Deal.id.in_(deal_ids), Deal.is_deleted.is_(False))
            .options(joinedload(Deal.status), joinedload(Deal.board))
        )
        result = await self.session.execute(stmt)
        return list(result.scalars().all())

    def _process_get_by_id_stmt(self, stmt: Select) -> Select:
        return stmt.options(joinedload(Deal.status), joinedload(Deal.board))

    async def update_status(self, deal: Deal, status_id: int):
        if deal.status_id == status_id:
            return

        deal.status_history.append(
            DealStatusHistory(
                from_status_id=deal.status_id,
                to_status_id=status_id,
            )
        )
        deal.status_id = status_id

    async def update(self, deal: Deal, data: UpdateDealSchema) -> Deal:
        fields = ["lexorank", "name", "board_id"]
        deal = await self._apply_update_data_to_model(deal, data, False, fields)

        if data.status_id:
            await self.update_status(deal, data.status_id)

        self.session.add(deal)
        await self.session.commit()
        await self.session.refresh(deal)
        return deal