from datetime import timedelta
from typing import Optional
from sqlalchemy.orm import Session
from fastapi import HTTPException, status
from app.models.user import User
from app.core.security import verify_password, create_access_token, get_password_hash
from app.core.config import settings

class AuthService:
    @staticmethod
    def authenticate_user(db: Session, email: str, password: str) -> Optional[User]:
        user = db.query(User).filter(User.email == email).first()
        if not user:
            return None
        if not verify_password(password, user.hashed_password):
            return None
        return user

    @staticmethod
    def create_user_token(user: User) -> dict:
        access_token_expires = timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
        access_token = create_access_token(
            subject=user.email, expires_delta=access_token_expires
        )
        return {"access_token": access_token, "token_type": "bearer"}

    @staticmethod
    def hash_password(password: str) -> str:
        return get_password_hash(password)