from typing import Optional
from sqlalchemy.orm import Session

from app.core.security import get_password_hash, verify_password
from app.models.user import User
from app.schemas.user import UserCreate, UserUpdate


class UserService:
    def get(self, db: Session, user_id: int) -> Optional[User]:
        return db.query(User).filter(User.id == user_id).first()

    def get_by_email(self, db: Session, email: str) -> Optional[User]:
        return db.query(User).filter(User.email == email).first()

    def create(self, db: Session, obj_in: UserCreate) -> User:
        db_obj = User(
            email=obj_in.email,
            hashed_password=get_password_hash(obj_in.password),
            full_name=obj_in.full_name,
            company_name=obj_in.company_name,
            is_active=obj_in.is_active,
        )
        db.add(db_obj)
        db.commit()
        db.refresh(db_obj)
        return db_obj

    def update(self, db: Session, db_obj: User, obj_in: UserUpdate) -> User:
        update_data = obj_in.dict(exclude_unset=True)
        if "password" in update_data:
            hashed_password = get_password_hash(update_data["password"])
            del update_data["password"]
            update_data["hashed_password"] = hashed_password
        
        for field, value in update_data.items():
            setattr(db_obj, field, value)
        
        db.add(db_obj)
        db.commit()
        db.refresh(db_obj)
        return db_obj

    def authenticate(self, db: Session, email: str, password: str) -> Optional[User]:
        user = self.get_by_email(db, email=email)
        if not user:
            return None
        if not verify_password(password, user.hashed_password):
            return None
        return user

    def is_active(self, user: User) -> bool:
        return user.is_active


user_service = UserService()