"""密码哈希与 JWT 签发/校验"""
from datetime import datetime, timedelta, timezone
from typing import Any, Dict, Optional

import bcrypt
from jose import JWTError, jwt

from app.core.config import get_settings


def hash_password(plain: str) -> str:
    return bcrypt.hashpw(plain.encode("utf-8"), bcrypt.gensalt()).decode("utf-8")


def verify_password(plain: str, password_hash: str) -> bool:
    try:
        return bcrypt.checkpw(plain.encode("utf-8"), password_hash.encode("utf-8"))
    except (ValueError, TypeError):
        return False


def create_access_token(sub: str, extra: Optional[Dict[str, Any]] = None) -> str:
    settings = get_settings()
    payload: Dict[str, Any] = {"sub": sub}
    if extra:
        payload.update(extra)
    expire = datetime.now(timezone.utc) + timedelta(minutes=settings.ACCESS_TOKEN_EXPIRE_MINUTES)
    payload["exp"] = expire
    return jwt.encode(payload, settings.SECRET_KEY, algorithm=settings.ALGORITHM)


def decode_token(token: str) -> Dict[str, Any]:
    settings = get_settings()
    return jwt.decode(token, settings.SECRET_KEY, algorithms=[settings.ALGORITHM])


class TokenError(Exception):
    """JWT 无效或过期。"""


def safe_decode_token(token: str) -> Dict[str, Any]:
    try:
        return decode_token(token)
    except JWTError as exc:
        raise TokenError(str(exc)) from exc