from passlib.context import CryptContext
from jose import JWTError, jwt
from datetime import datetime, timedelta, timezone
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.orm import Session
from database import get_db
from models import User_Auth  # Changed
from schemas import TokenData
from passlib.context import CryptContext

pwd_context = CryptContext(schemes=["argon2"], deprecated="auto")

SECRET_KEY = "secretkey"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_MINUTES = 60 * 24

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


def verify_password(plain_password, hashed_password):
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password):
    return pwd_context.hash(password)


def authenticate_user(db: Session, username: str, password: str):
    user = db.query(User_Auth).filter(User_Auth.username == username).first()
    if not user:
        return False
    if not verify_password(password, user.hashed_password):
        return False
    return user


def create_access_token(data: dict, expires_delta: timedelta = None):
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.now(timezone.utc) + expires_delta
    else:
        expire = datetime.now(timezone.utc) + timedelta(minutes=ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)
    return encoded_jwt


def get_current_user(token: str = Depends(oauth2_scheme), db: Session = Depends(get_db)):
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )
    
    try:
        payload = jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
        username: str = payload.get("sub")
        if username is None:
            raise credentials_exception
        token_data = TokenData(username=username)
    except JWTError:
        raise credentials_exception
    
    user = db.query(User_Auth).filter(User_Auth.username == token_data.username).first()
    if user is None:
        raise credentials_exception
    
    return user

# def get_current_user(current_user: User_Auth = Depends(get_current_user), db: Session = Depends(get_db)):
#     if not current_user.is_active:
#         raise HTTPException(status_code=400, detail="Inactive user")
#     return current_user