"""
Security utilities for password hashing and JWT token management.
"""

from datetime import (
    datetime,
    timedelta,
)
import bcrypt
from jose import JWTError, jwt

from config import settings


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


def verify_password(
    plain_password: str,
    hashed_password: str
) -> bool:
    """
    Verify a plain text password against a hashed password
    """
    password_bytes = plain_password.encode('utf-8')
    hashed_bytes = hashed_password.encode('utf-8')
    return bcrypt.checkpw(password_bytes, hashed_bytes)


def create_access_token(
    data: dict[str,
               str],
    expires_delta: timedelta | None = 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.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) -> dict[str, str]:
    """
    Decode and verify a JWT token
    """
    try:
        payload = jwt.decode(
            token,
            settings.SECRET_KEY,
            algorithms = [settings.ALGORITHM]
        )
        return payload
    except JWTError as e:
        raise ValueError(f"Invalid token: {str(e)}") from e