from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from jose import JWTError, jwt
from pydantic import ValidationError
from sqlalchemy.orm import Session

from app.core.security import ALGORITHM, SECRET_KEY
from app.db.session import get_db
from app.models.user import User
from app.schemas.token import TokenPayload
from app.services import user as user_service

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")


def get_current_user(
    db: Session = Depends(get_db), token: str = Depends(oauth2_scheme)
) -> User:
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        token_data = TokenPayload(**payload)
    except (JWTError, ValidationError):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Could not validate credentials",
            headers={"WWW-Authenticate": "Bearer"},
        )
    user = user_service.get(db, user_id=token_data.sub)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND, detail="User not found"
        )
    return user


def get_current_active_user(current_user: User = Depends(get_current_user)) -> User:
    if not user_service.is_active(current_user):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail="Inactive user"
        )
    return current_user


def get_current_superuser(current_user: User = Depends(get_current_active_user)) -> User:
    if not user_service.is_superuser(current_user):
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN, detail="Not enough permissions"
        )
    return current_user