"""
Authentication utilities — password hashing and JWT token management.
"""
from datetime import datetime, timedelta, timezone

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

from app.config import settings

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

ALGORITHM = "HS256"


def hash_password(plain: str) -> str:
    return pwd_context.hash(plain)


def verify_password(plain: str, hashed: str) -> bool:
    return pwd_context.verify(plain, hashed)


def create_access_token(user_id: str, role: str) -> str:
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.access_token_expire_minutes)
    payload = {
        "sub": user_id,
        "role": role,
        "exp": expire,
        "type": "access",
    }
    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)


def create_refresh_token(user_id: str) -> str:
    expire = datetime.now(timezone.utc) + timedelta(days=settings.refresh_token_expire_days)
    payload = {
        "sub": user_id,
        "exp": expire,
        "type": "refresh",
    }
    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)


def decode_token(token: str) -> dict:
    """Decode and validate a JWT. Raises JWTError on any problem."""
    return jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])