from datetime import datetime, timedelta, timezone
from typing import Optional, Dict, Any
import bcrypt
from jose import jwt, JWTError
from app.core.config import settings

def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Összehasonlítja a sima szöveges jelszót a hash-elt változattal."""
    if not hashed_password:
        return False
    try:
        return bcrypt.checkpw(
            plain_password.encode("utf-8"), 
            hashed_password.encode("utf-8")
        )
    except Exception:
        return False

def get_password_hash(password: str) -> str:
    """Létrehozza a jelszó hash-elt változatát."""
    salt = bcrypt.gensalt()
    return bcrypt.hashpw(password.encode("utf-8"), salt).decode("utf-8")

def create_access_token(data: Dict[str, Any], expires_delta: Optional[timedelta] = None) -> str:
    """Létrehozza a JWT access tokent."""
    to_encode = data.copy()
    if expires_delta:
        expire = datetime.now(timezone.utc) + expires_delta
    else:
        expire = datetime.now(timezone.utc) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    
    to_encode.update({"exp": expire})
    encoded_jwt = jwt.encode(to_encode, settings.SECRET_KEY, algorithm=settings.ALGORITHM)
    return encoded_jwt

def decode_token(token: str) -> Optional[Dict[str, Any]]:
    """JWT token visszafejtése és validálása."""
    try:
        payload = jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])
        return payload
    except JWTError:
        return None