"""安全模块：密码哈希 + JWT"""

from datetime import datetime, timedelta, timezone
from typing import Optional
import bcrypt
from jose import jwt, JWTError

SECRET_KEY = "douyu-web-secret-change-in-production"
ALGORITHM = "HS256"
ACCESS_TOKEN_EXPIRE_HOURS = 24


def hash_password(password: str) -> str:
    pwd_bytes = password.encode("utf-8")
    # bcrypt 限制72字节，截断
    pwd_bytes = pwd_bytes[:72]
    return bcrypt.hashpw(pwd_bytes, bcrypt.gensalt()).decode("utf-8")


def verify_password(plain: str, hashed: str) -> bool:
    try:
        return bcrypt.checkpw(plain.encode("utf-8")[:72], hashed.encode("utf-8"))
    except Exception:
        return False


def create_access_token(data: dict, expires_hours: int = ACCESS_TOKEN_EXPIRE_HOURS) -> str:
    to_encode = data.copy()
    expire = datetime.now(timezone.utc) + timedelta(hours=expires_hours)
    to_encode.update({"exp": expire})
    return jwt.encode(to_encode, SECRET_KEY, algorithm=ALGORITHM)


def decode_access_token(token: str) -> Optional[dict]:
    try:
        return jwt.decode(token, SECRET_KEY, algorithms=[ALGORITHM])
    except JWTError:
        return None