# app/services/item_service.py
from typing import Optional, List
from app.models.item import Item
from app.schemas.item import ItemCreate, ItemUpdate

class ItemService:
    @staticmethod
    async def get_all_items(
        skip: int = 0, 
        limit: int = 100,
        owner_id: Optional[int] = None
    ) -> List[Item]:
        query = Item.all()
        if owner_id:
            query = query.filter(owner_id=owner_id)
        return await query.offset(skip).limit(limit)
    
    @staticmethod
    async def get_item_by_id(item_id: int) -> Optional[Item]:
        return await Item.filter(id=item_id).first().prefetch_related("owner")
    
    @staticmethod
    async def create_item(item_data: ItemCreate, owner_id: Optional[int] = None) -> Item:
        item = await Item.create(
            **item_data.model_dump(),
            owner_id=owner_id
        )
        return item
    
    @staticmethod
    async def update_item(item_id: int, item_data: ItemUpdate) -> Optional[Item]:
        item = await ItemService.get_item_by_id(item_id)
        if not item:
            return None
        
        update_data = item_data.model_dump(exclude_unset=True)
        await item.update_from_dict(update_data)
        await item.save()
        return item
    
    @staticmethod
    async def delete_item(item_id: int) -> bool:
        item = await ItemService.get_item_by_id(item_id)
        if item:
            await item.delete()
            return True
        return False