from datetime import datetime, timedelta, timezone

import jwt
from pwdlib import PasswordHash

from app.core.config import get_settings

_password_hash = PasswordHash.recommended()  # argon2id
ALGORITHM = "HS256"


def hash_password(password: str) -> str:
    return _password_hash.hash(password)


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


def create_access_token(
    subject: str,
    expires_delta: timedelta | None = None,
    extra_claims: dict | None = None,
) -> str:
    settings = get_settings()
    expire = datetime.now(timezone.utc) + (
        expires_delta or timedelta(minutes=settings.access_token_expire_minutes)
    )
    payload = {"sub": subject, "exp": expire}
    if extra_claims:
        payload.update(extra_claims)
    return jwt.encode(payload, settings.secret_key, algorithm=ALGORITHM)


def decode_access_token(token: str) -> dict | None:
    settings = get_settings()
    try:
        return jwt.decode(token, settings.secret_key, algorithms=[ALGORITHM])
    except jwt.PyJWTError:
        return None