LOGIN_COOKIE_KEYS = frozenset({
    "sessionid", "sessionid_ss", "sid_guard", "uid_tt", "uid_tt_ss",
    "sso_uid_tt", "sso_uid_tt_ss", "passport_sso_user_id",
    "sid_ucp_sso", "sid_guard_ee", "uid_tt_ee",
    "passport_auth_status", "login_time", "multi_sids",
    "is_login", "douyin_tt",
})


def match_login_cookies(cookie_names):
    name_set = set(cookie_names)
    return [k for k in LOGIN_COOKIE_KEYS if k in name_set]


def is_logged_in(cookies, cookie_names):
    matched = match_login_cookies(cookie_names)
    name_set = set(cookie_names)
    if len(matched) >= 2:
        return True
    has_session = bool(name_set & {"sessionid", "sessionid_ss", "sid_guard", "sid_tt"})
    has_uid = bool(name_set & {"uid_tt", "uid_tt_ss", "passport_sso_user_id"})
    if has_session and has_uid:
        return True
    if has_session and len(cookies) >= 30:
        return True
    for c in cookies:
        if c["name"] == "passport_auth_status":
            val = str(c.get("value", "")).lower()
            if val in ("1", "true", "yes", "2") and has_session:
                return True
        if c["name"] == "login_time" and c.get("value"):
            return True
    return False


def extract_nickname(cookies):
    for c in cookies:
        if c["name"] in ("passport_sso_user_name", "nickname", "user_name", "user_nickname"):
            return c["value"]
    for c in cookies:
        if c["name"] == "uid_tt" and c.get("value"):
            return f"用户{c['value'][:8]}"
    return "用户"


def cookies_to_json(cookie_jar) -> list[dict]:
    """将 requests CookieJar 转为前端 JSON 列表"""
    items = []
    for c in cookie_jar:
        items.append({
            "name": c.name,
            "value": c.value,
            "domain": c.domain or ".douyin.com",
            "path": c.path or "/",
            "expires": c.expires,
            "httpOnly": bool(getattr(c, "_rest", {}).get("HttpOnly") or False),
            "secure": bool(c.secure),
        })
    return items