"""Persistence operations for system static data."""

from typing import Any, Dict, List, Optional

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

from app.database import AsyncSessionLocal
from app.models.db import StaticData


class StaticDataService:
    """Create, read, update, and delete static data entries."""

    @staticmethod
    async def get_all_items(
        session: Optional[AsyncSession] = None,
    ) -> List[StaticData]:
        async def query(active_session: AsyncSession) -> List[StaticData]:
            result = await active_session.execute(
                select(StaticData).order_by(StaticData.category, StaticData.name)
            )
            return list(result.scalars().all())

        if session is not None:
            return await query(session)
        async with AsyncSessionLocal() as active_session:
            return await query(active_session)

    @staticmethod
    async def create_static(
        data: Dict[str, Any],
        session: Optional[AsyncSession] = None,
    ) -> StaticData:
        async def create(active_session: AsyncSession) -> StaticData:
            item = StaticData(**data)
            active_session.add(item)
            await active_session.commit()
            await active_session.refresh(item)
            return item

        if session is not None:
            return await create(session)
        async with AsyncSessionLocal() as active_session:
            return await create(active_session)

    @staticmethod
    async def update_static(
        item_id: int,
        update_data: Dict[str, Any],
        session: Optional[AsyncSession] = None,
    ) -> Optional[StaticData]:
        async def update(active_session: AsyncSession) -> Optional[StaticData]:
            result = await active_session.execute(
                select(StaticData).where(StaticData.id == item_id)
            )
            item = result.scalar_one_or_none()
            if item is None:
                return None

            for key, value in update_data.items():
                if hasattr(item, key):
                    setattr(item, key, value)

            await active_session.commit()
            await active_session.refresh(item)
            return item

        if session is not None:
            return await update(session)
        async with AsyncSessionLocal() as active_session:
            return await update(active_session)

    @staticmethod
    async def delete_static(
        item_id: int,
        session: Optional[AsyncSession] = None,
    ) -> bool:
        async def delete(active_session: AsyncSession) -> bool:
            result = await active_session.execute(
                select(StaticData).where(StaticData.id == item_id)
            )
            item = result.scalar_one_or_none()
            if item is None:
                return False

            await active_session.delete(item)
            await active_session.commit()
            return True

        if session is not None:
            return await delete(session)
        async with AsyncSessionLocal() as active_session:
            return await delete(active_session)

    @staticmethod
    async def get_by_category(
        category: str,
        session: Optional[AsyncSession] = None,
    ) -> List[StaticData]:
        async def query(active_session: AsyncSession) -> List[StaticData]:
            result = await active_session.execute(
                select(StaticData)
                .where(StaticData.category == category)
                .order_by(StaticData.name)
            )
            return list(result.scalars().all())

        if session is not None:
            return await query(session)
        async with AsyncSessionLocal() as active_session:
            return await query(active_session)

    @staticmethod
    async def get_all_categories(
        session: Optional[AsyncSession] = None,
    ) -> List[str]:
        async def query(active_session: AsyncSession) -> List[str]:
            result = await active_session.execute(
                select(StaticData.category).distinct()
            )
            return [row[0] for row in result]

        if session is not None:
            return await query(session)
        async with AsyncSessionLocal() as active_session:
            return await query(active_session)


static_data_service = StaticDataService()