# app/services/user_service.py
from typing import Optional, List
from app.models.user import User
from app.schemas.user import UserCreate, UserUpdate
from passlib.context import CryptContext

pwd_context = CryptContext(schemes=["bcrypt"], deprecated="auto")

class UserService:
    @staticmethod
    def get_password_hash(password: str) -> str:
        return pwd_context.hash(password)
    
    @staticmethod
    def verify_password(plain_password: str, hashed_password: str) -> bool:
        return pwd_context.verify(plain_password, hashed_password)
    
    @staticmethod
    async def get_all_users(skip: int = 0, limit: int = 100) -> List[User]:
        return await User.all().offset(skip).limit(limit)
    
    @staticmethod
    async def get_user_by_id(user_id: int) -> Optional[User]:
        return await User.filter(id=user_id).first()
    
    @staticmethod
    async def get_user_by_username(username: str) -> Optional[User]:
        return await User.filter(username=username).first()
    
    @staticmethod
    async def get_user_by_email(email: str) -> Optional[User]:
        return await User.filter(email=email).first()
    
    @staticmethod
    async def create_user(user_data: UserCreate) -> User:
        hashed_password = UserService.get_password_hash(user_data.password)
        user = await User.create(
            username=user_data.username,
            email=user_data.email,
            hashed_password=hashed_password
        )
        return user
    
    @staticmethod
    async def update_user(user_id: int, user_data: UserUpdate) -> Optional[User]:
        user = await UserService.get_user_by_id(user_id)
        if not user:
            return None
        
        update_data = user_data.model_dump(exclude_unset=True)
        
        if "password" in update_data:
            update_data["hashed_password"] = UserService.get_password_hash(
                update_data.pop("password")
            )
        
        await user.update_from_dict(update_data)
        await user.save()
        return user
    
    @staticmethod
    async def delete_user(user_id: int) -> bool:
        user = await UserService.get_user_by_id(user_id)
        if user:
            await user.delete()
            return True
        return False


# 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