"""Microsoft Teams 密钥输入规范化。

处理用户输入的密钥字符串，去除多余空格、换行，
检测是否已配置合法密钥。
"""

from __future__ import annotations

import logging

logger = logging.getLogger(__name__)


def normalize_secret_input(raw: str) -> str:
    """规范化用户输入的密钥字符串。

    - 去除首尾空白和换行
    - 去除连续的空白行
    - 去除不可见字符（保留 ASCII 可打印字符）
    """
    if not raw:
        return ""

    cleaned = raw.strip()
    lines = cleaned.splitlines()
    cleaned = " ".join(line.strip() for line in lines if line.strip())

    cleaned = "".join(c for c in cleaned if 32 <= ord(c) <= 126 or c in "\t")

    return cleaned


def has_configured_secret(value: str, min_length: int = 8) -> bool:
    """检测密钥是否已配置且合法。

    Returns True 如果密钥长度 >= min_length 且不是占位符。
    """
    if not value or len(value) < min_length:
        return False

    placeholder_lower = value.lower()
    placeholders = {
        "your_app_password_here",
        "replace_with_your_secret",
        "changeme",
        "password",
        "secret",
    }
    if placeholder_lower in placeholders:
        logger.warning("MSTeams: secret appears to be a placeholder value")
        return False

    return True