"""
安全相关:密码哈希、JWT访问令牌签发与解析。
"""
from datetime import datetime, timedelta, timezone
from typing import Any
from jose import jwt
from passlib.context import CryptContext
from app.core.config import settings

#密码加密
pwd_context = CryptContext(
    schemes=["pbkdf2_sha256", "bcrypt"], deprecated="auto")

#注册时加密密码
def hash_password(password: str) -> str:
    return pwd_context.hash(password)

#登录时验证密码
def verify_password(password: str, password_hash: str) -> bool:
    return pwd_context.verify(password, password_hash)

#登录成功时签发JWT令牌
def create_access_token(subject: str, expires_delta: timedelta | None = None, extra: dict[str, Any] | None = None) -> str:
    now = datetime.now(timezone.utc)
    expire = now + (expires_delta or timedelta(minutes=settings.access_token_exp_minutes))
    payload: dict[str, Any] = {"sub": subject, "iat": int(now.timestamp()), "exp": int(expire.timestamp())}
    if extra:
        payload.update(extra)
    return jwt.encode(payload, settings.jwt_secret_key, algorithm=settings.jwt_algorithm)

#解析JWT令牌并验证
def decode_token(token: str) -> dict[str, Any]:
    return jwt.decode(token, settings.jwt_secret_key, algorithms=[settings.jwt_algorithm])