from typing import Optional

from passlib.context import CryptContext
from sqlalchemy.orm import Session

from app.models.user import User
from app.schemas.user import UserCreate, UserUpdate

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

def get_password_hash(password: str) -> str:
    return pwd_context.hash(password)

def verify_password(plain_password: str, hashed_password: str) -> bool:
    return pwd_context.verify(plain_password, hashed_password)

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

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

def get_users(db: Session, skip: int = 0, limit: int = 100):
    return db.query(User).offset(skip).limit(limit).all()

def create_user(db: Session, user: UserCreate) -> User:
    hashed_password = get_password_hash(user.password)
    db_user = User(
        email=user.email,
        full_name=user.full_name,
        hashed_password=hashed_password,
        is_active=user.is_active
    )
    db.add(db_user)
    db.commit()
    db.refresh(db_user)
    return db_user

def update_user(db: Session, user_id: int, user_update: UserUpdate) -> Optional[User]:
    db_user = get_user(db, user_id)
    if db_user:
        update_data = user_update.dict(exclude_unset=True)
        for field, value in update_data.items():
            setattr(db_user, field, value)
        db.commit()
        db.refresh(db_user)
    return db_user

def delete_user(db: Session, user_id: int) -> bool:
    db_user = get_user(db, user_id)
    if db_user:
        db.delete(db_user)
        db.commit()
        return True
    return False