// Mock @langchain/openai 让 fetch hang（永不响应）测真实路径 invokeWithRetry
process.on('SIGTERM', () => process.exit(0));

const Module = require('module');
const origResolve = Module._resolve_filename = Module._resolveFilename;
let hookInstalled = false;

function installFetchHang(MockClass) {
  const origInvoke = MockClass.prototype.invoke;
  let invokeCount = 0;
  let nodeIndex = 0;
  MockClass.prototype.invoke = async function patchedInvoke(messages) {
    invokeCount++;
    console.log(`[hang-mock] invoke #${invokeCount} on instance with model=${this.model} apiKey-end=${(this.apiKey || '').slice(-12)}`);
    // 模拟 HTTP 永不响应 — 返回一个永远不 resolve 的 Promise
    // 但调用 await Promise.race / onTimeout 让超时能 abort
    return new Promise((_, reject) => {
      // 100ms 后抛"timeout"模拟 disconnect-after-start
      setTimeout(() => {
        const err = new Error('Request timed out after 30000ms (fake hang)');
        err.name = 'AbortError';
        reject(err);
      }, 30000);
    });
  };
  return MockClass;
}

const origLoad = Module._load;
Module._load = function (req, parent, ...rest) {
  const exported = origLoad.call(this, req, parent, ...rest);
  if (req === '@langchain/openai' && !hookInstalled) {
    hookInstalled = true;
    if (exported.ChatOpenAI) {
      return { ...exported, ChatOpenAI: installFetchHang(exported.ChatOpenAI) };
    }
  }
  return exported;
};

// 真实入口
const llm = require('/data/ai/audio/server/dist/services/llm');

(async () => {
  const start = Date.now();
  console.log('[t=0] calling callLLMWithMessages (qwen3.5-flash) — should fallback through providers');
  try {
    const r = await llm.callLLMWithMessages(
      [
        { role: 'user', content: '一句话总结' }
      ],
      'qwen3.5-flash',
      100
    );
    console.log(`[t=${(Date.now() - start) / 1000}s] OK: ${r.slice(0, 100)}`);
  } catch (e) {
    console.log(`[t=${(Date.now() - start) / 1000}s] ERR name=${e?.name}: ${e?.message?.slice(0, 200)}`);
    if (e.attempts) {
      console.log('attempts:', JSON.stringify(e.attempts, null, 2));
    }
  }
  process.exit(0);
})();