"""Security utilities for authentication and authorization."""
from datetime import datetime, timedelta
from typing import Optional, Dict, Any

import bcrypt
from jose import jwt, JWTError

from app.core.config import settings


def get_password_hash(password: str) -> str:
    """Hash a password using bcrypt."""
    salt = bcrypt.gensalt()
    hashed = bcrypt.hashpw(password.encode('utf-8'), salt)
    return hashed.decode('utf-8')


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verify a password against its hash."""
    return bcrypt.checkpw(
        plain_password.encode('utf-8'),
        hashed_password.encode('utf-8')
    )


def create_access_token(
    data: Dict[str, Any],
    expires_delta: Optional[timedelta] = None
) -> str:
    """Create a JWT access token."""
    to_encode = data.copy()

    if expires_delta:
        expire = datetime.utcnow() + expires_delta
    else:
        expire = datetime.utcnow() + timedelta(
            minutes=settings.JWT_ACCESS_TOKEN_EXPIRE_MINUTES
        )

    to_encode.update({"exp": expire})

    encoded_jwt = jwt.encode(
        to_encode,
        settings.JWT_SECRET_KEY,
        algorithm=settings.JWT_ALGORITHM
    )

    return encoded_jwt


def decode_access_token(token: str) -> Optional[Dict[str, Any]]:
    """Decode and validate a JWT access token."""
    try:
        payload = jwt.decode(
            token,
            settings.JWT_SECRET_KEY,
            algorithms=[settings.JWT_ALGORITHM]
        )
        return payload
    except JWTError:
        return None