from uuid import UUID

import jwt
from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
from sqlalchemy.orm import Session

from app.core.security import decode_access_token
from app.db.session import get_db
from app.models.user import User


bearer_scheme = HTTPBearer()


def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(bearer_scheme),
    db: Session = Depends(get_db),
) -> User:
    try:
        payload = decode_access_token(credentials.credentials)
        user_id = UUID(payload["sub"])
    except (jwt.InvalidTokenError, KeyError, ValueError):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Invalid or expired access token.",
        )

    user = db.get(User, user_id)

    if user is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="User not found.",
        )

    if not user.is_active:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="This account is inactive.",
        )
    if payload.get("sv", 0) != user.platform_session_version:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="This session was revoked. Please sign in again.")

    return user