/**
 * 凭证脱敏的唯一键表与字符串规则(服务端 logger、Agent 模型上下文、适配器错误信息共用)。
 * 覆盖 cookie / passkey / rsskey / torrent_pass / authkey / downhash / c_secure_pass / token / apiKey /
 * authorization / x-api-key 头 / URL 内嵌账号密码。键名先规范化(小写、去掉 - _ 空白)再判断,
 * 所以 PassKey、pass-key、pass_key、X-Api-Key 都能命中。
 * 宁可多遮不可漏遮:误伤只影响可读性,漏遮会把凭证送进日志或外部模型。
 */
export const REDACTED = "[REDACTED]";

/** 规范化后的键名只要包含其中一项即视为敏感 */
export const SENSITIVE_KEY_PARTS: readonly string[] = [
  "cookie",
  "passkey",
  "authkey",
  "torrentpass",
  "securepass",
  "rsskey",
  "downhash",
  "apikey",
  "authorization",
  "secret",
  "password",
  "passwd",
  "credential",
  "privatekey",
];

/** 规范化键名(去掉 - _ 空白并小写)后判断。以 token 结尾算敏感,tokens(用量统计)不算。 */
export function isSensitiveKey(key: string): boolean {
  const k = key.toLowerCase().replace(/[-_\s]/g, "");
  if (k.endsWith("token")) return true;
  if (k === "sign" || k === "signature") return true;
  return SENSITIVE_KEY_PARTS.some((part) => k.includes(part));
}

/** URL 查询参数/片段中视为凭证的参数名(正则片段,大小写不敏感;- _ 可选的写成 [_-]?) */
export const SENSITIVE_QUERY_PARAMS: readonly string[] = [
  "pass[_-]?key",
  "auth[_-]?key",
  "torrent[_-]?pass",
  "rss[_-]?key",
  "c[_-]?secure[_-]?pass",
  "down[_-]?hash",
  "api[_-]?key",
  "access[_-]?token",
  "refresh[_-]?token",
  "token",
  "auth",
  "sign",
  "signature",
  "credential",
  "secret",
  "password",
  "uid[_-]?key",
  "key",
];

const PARAM_NAME_RE = new RegExp(`^(?:${SENSITIVE_QUERY_PARAMS.join("|")})$`, "i");

/**
 * 单个 URL 查询参数名是否为凭证(整名匹配 SENSITIVE_QUERY_PARAMS,或按 isSensitiveKey 的键名规则命中)。
 * rss / browser 等适配器的参数判定都走这里,不再各自维护键表(验收 07 S-4)。
 */
export function isSensitiveQueryParam(name: string): boolean {
  return PARAM_NAME_RE.test(name) || isSensitiveKey(name);
}

const PARAM_RE = new RegExp(`([?&;#]|\\b)(${SENSITIVE_QUERY_PARAMS.join("|")})=([^&;#\\s"'<>]+)`, "gi");
const URL_USERINFO_RE = /\b([a-z][a-z0-9+.-]*:\/\/)([^/\s:@]+):([^/\s@]+)@/gi;
const BEARER_RE = /\b(Bearer|Basic|Token)\s+[A-Za-z0-9._~+/=-]{6,}/g;
const HEADER_RE = /\b(cookie|set-cookie|authorization|x-api-key)\s*:\s*[^\r\n]+/gi;
const KNOWN_KEY_RE = /\b(sk-[A-Za-z0-9_-]{8,}|sk-ant-[A-Za-z0-9_-]{8,}|gh[pousr]_[A-Za-z0-9]{16,})\b/g;

/** 文本脱敏:请求头行、URL userinfo、query 凭证参数、Bearer/Basic、已知格式的密钥 */
export function redactString(input: string): string {
  return input
    .replace(HEADER_RE, (_m, name: string) => `${name}: ${REDACTED}`)
    .replace(URL_USERINFO_RE, (_m, scheme: string) => `${scheme}${REDACTED}@`)
    .replace(PARAM_RE, (_m, lead: string, name: string) => `${lead}${name}=${REDACTED}`)
    .replace(BEARER_RE, (_m, scheme: string) => `${scheme} ${REDACTED}`)
    .replace(KNOWN_KEY_RE, REDACTED);
}

/**
 * URL(或含 URL 的错误信息)脱敏。`secrets` 为调用方已知的明文凭证,出现在任何位置都会被替换
 * (兜底 fetch 实现把 URL 编码后再拼进错误信息之类的情况)。
 */
export function redactUrl(input: string, secrets: readonly (string | undefined | null)[] = []): string {
  let out = redactString(input);
  for (const s of secrets) {
    if (!s || s.length < 4) continue;
    out = out.split(s).join(REDACTED);
    const enc = encodeURIComponent(s);
    if (enc !== s) out = out.split(enc).join(REDACTED);
  }
  return out;
}