from datetime import datetime, timedelta, timezone
from typing import Optional

from passlib.context import CryptContext
from jose import JWTError, jwt

from app.config import get_settings

settings = get_settings()

# Password hashing context
pwd_context = CryptContext(
    schemes=["bcrypt"], deprecated="auto", bcrypt__rounds=settings.PASSWORD_COST_FACTOR
)


def verify_password(plain_password: str, hashed_password: str) -> bool:
    """Verify a password against a hash."""
    return pwd_context.verify(plain_password, hashed_password)


def get_password_hash(password: str) -> str:
    """Hash a password."""
    return pwd_context.hash(password)


def create_access_token(data: dict, expires_delta: Optional[timedelta] = None) -> str:
    """Create a JWT access token."""
    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_access_token(token: str) -> Optional[dict]:
    """Decode a JWT access token."""
    try:
        payload = jwt.decode(
            token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM]
        )
        return payload
    except JWTError:
        return None