import uuid
from typing import Optional

from sqlalchemy import select, func
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.competitor import Competitor


class CompetitorRepository:
    def __init__(self, session: AsyncSession):
        self.session = session

    async def get_by_id(self, id: uuid.UUID) -> Optional[Competitor]:
        result = await self.session.execute(
            select(Competitor).where(Competitor.id == id)
        )
        return result.scalar_one_or_none()

    async def list_by_brand(
        self, brand_id: uuid.UUID, *, skip: int = 0, limit: int = 100
    ) -> list[Competitor]:
        result = await self.session.execute(
            select(Competitor)
            .where(Competitor.brand_id == brand_id)
            .order_by(Competitor.created_at.desc())
            .offset(skip)
            .limit(limit)
        )
        return list(result.scalars().all())

    async def count_by_brand(self, brand_id: uuid.UUID) -> int:
        result = await self.session.execute(
            select(func.count()).select_from(Competitor).where(
                Competitor.brand_id == brand_id
            )
        )
        return result.scalar_one()

    async def get_by_brand(self, brand_name: str) -> list[Competitor]:
        from app.models.brand import Brand
        result = await self.session.execute(
            select(Competitor)
            .join(Brand, Competitor.brand_id == Brand.id)
            .where(Brand.name == brand_name)
        )
        return list(result.scalars().all())

    async def create(self, **kwargs) -> Competitor:
        instance = Competitor(**kwargs)
        self.session.add(instance)
        await self.session.flush()
        return instance

    async def update(self, id: uuid.UUID, **kwargs) -> Optional[Competitor]:
        instance = await self.get_by_id(id)
        if instance is None:
            return None
        for key, value in kwargs.items():
            if hasattr(instance, key):
                setattr(instance, key, value)
        await self.session.flush()
        return instance

    async def delete(self, id: uuid.UUID) -> bool:
        instance = await self.get_by_id(id)
        if instance is None:
            return False
        await self.session.delete(instance)
        await self.session.flush()
        return True