from datetime import datetime, timedelta, timezone
from typing import Optional
from jose import JWTError, jwt
from passlib.context import CryptContext
from fastapi import Cookie, HTTPException, status, Depends
from sqlalchemy.orm import Session
from app.database import get_db, settings
from app import models

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


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


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


def create_access_token(user_id: int) -> str:
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.jwt_expire_minutes)
    return jwt.encode(
        {"sub": str(user_id), "exp": expire},
        settings.jwt_secret_key,
        algorithm=settings.jwt_algorithm,
    )


def get_current_user(
    access_token: Optional[str] = Cookie(default=None),
    db: Session = Depends(get_db),
) -> models.User:
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Not authenticated",
    )
    if not access_token:
        raise credentials_exception
    try:
        payload = jwt.decode(access_token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])
        user_id: str = payload.get("sub")
        if user_id is None:
            raise credentials_exception
    except JWTError:
        raise credentials_exception

    user = db.get(models.User, int(user_id))
    if user is None or not user.is_active:
        raise credentials_exception
    return user