from typing import Optional, Sequence

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

from app.domain.models import ContestFile


class ContestFilesRepository:
    def __init__(self, db: AsyncSession):
        self.db = db

    async def get_by_id(self, file_id: int) -> Optional[ContestFile]:
        stmt = select(ContestFile).filter_by(id=file_id)
        result = await self.db.execute(stmt)
        return result.scalars().first()

    async def get_by_contest_id(self, contest_id: int) -> Sequence[ContestFile]:
        stmt = select(ContestFile).filter_by(contest_id=contest_id)
        result = await self.db.execute(stmt)
        return result.scalars().all()

    async def create(self, contest_file: ContestFile) -> ContestFile:
        self.db.add(contest_file)
        await self.db.commit()
        await self.db.refresh(contest_file)
        return contest_file

    async def delete(self, contest_file: ContestFile) -> ContestFile:
        await self.db.delete(contest_file)
        await self.db.commit()
        return contest_file