// Copyright (c) 未来飞马
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at https://mozilla.org/MPL/2.0/.
//
// Trademark Notice:
// The MPL-2.0 license grants copyright permissions for source code only.
// It does NOT grant any rights to use trademarks including "未来飞马",
// "Harness Loop", "RSI", and associated slogan "让AI进化提前发生，让AI落地快人一步".
// Any use of these trademarks requires separate written permission.

import { readFileSync, existsSync } from 'node:fs';
import { hostname, homedir } from 'node:os';

// 读取 JSON 文件，自动剥 BOM，失败返回 null
function readJson(p) {
  if (!existsSync(p)) return null;
  try {
    const raw = readFileSync(p, 'utf-8').replace(/^/, '');
    return JSON.parse(raw);
  } catch {
    return null;
  }
}

/**
 * 身份解析高兼容链：
 *   userid:        FMODE_USERID → FMODE_AGENT_USERID → /opt/data/fmode-identity.json → $HOME/.fmode/config.json → ./.fmode/config.json
 *   sessionToken:  FMODE_SESSION_TOKEN → $HOME/.fmode/config/user.json → $HOME/.fmode/config.json → ./.fmode/config.json
 *   agentId:       FMODE_AGENT_ID → AGENT_ID → $HOME/.fmode/config.json → hostname()
 *
 * $HOME 容器 hermes 用户 = /opt/data；root 用户 = /root；两处都能命中。
 */
export function resolveIdentity() {
  const home = process.env.HOME || homedir();

  const userid =
    process.env.FMODE_USERID ||
    process.env.FMODE_AGENT_USERID ||
    readJson('/opt/data/fmode-identity.json')?.userid ||
    readJson(`${home}/.fmode/config.json`)?.userid ||
    readJson('./.fmode/config.json')?.userid ||
    null;

  const sessionToken =
    process.env.FMODE_SESSION_TOKEN ||
    readJson(`${home}/.fmode/config/user.json`)?.sessionToken ||
    readJson(`${home}/.fmode/config.json`)?.sessionToken ||
    readJson('./.fmode/config.json')?.sessionToken ||
    null;

  const agentId =
    process.env.FMODE_AGENT_ID ||
    process.env.AGENT_ID ||
    readJson(`${home}/.fmode/config.json`)?.agentId ||
    hostname();

  return { userid, sessionToken, agentId };
}

/** 仅打印身份摘要（不暴露密钥本体）*/
export function identitySummary(identity) {
  const { userid, sessionToken, agentId } = identity;
  return {
    userid: userid || '(未找到)',
    sessionToken: sessionToken
      ? `${sessionToken.slice(0, 8)}... (${sessionToken.length} 字符)`
      : '(未找到)',
    agentId,
  };
}