/**
 * 在 node 里**完整复刻浏览器那条采集/组帧路径**，打真实网关看能不能出字。
 *
 * 为什么要有它（2026-09-24）：用户报「进了录音状态但不出字」，控制台日志显示
 * 采集在跑（48k/2048 样本一块）、音频也一帧帧推上去了（34 秒），但网关**一条结果都没回**。
 * 前端侧剩下的可疑点就是「按 2048 样本分块 → 各自重采样 → 拼成 3200 字节帧」这条路径
 * （node 的探针推的是**预先压好的 16k 整帧**，走不到这条路径，所以它绿不代表浏览器这条绿）。
 *
 * 这里用同一个 `encodePcm16kMono()`（`src/asr/nls-protocol.ts`，前端同一份代码）：
 *   ① 把 TTS 音频重采样到 **48k**（模拟 48k 设备）
 *   ② 按 **2048 样本**切块，每块过 `encodePcm16kMono(chunk, 48000)` → 约 1366 字节
 *   ③ 按 **42.7ms 一块** 的节奏入队（模拟 ScriptProcessor 的回调节奏）
 *   ④ 每 50ms 把队列里的块拼进 carry，凑够 3200 字节就发一帧（模拟 nls.ts 的 flush）
 *
 * 怎么跑（先打包协议层）：
 *   npx esbuild harness/tools/_entry-nls.ts --bundle --format=esm \
 *     --outfile=harness/tools/_nls.mjs --alias:@=./src --define:import.meta.env='{}'
 *   node harness/tools/verify-nls-browser-path.mjs
 */

import { readAudioAsPcm16kMono, resampleTo16k, synthesizeSpeechToWav } from './nls-test-audio.mjs';
import { NLS_LOCAL_ENV_FILE, readDotEnvFile, readNlsCredentials, resolveNlsToken } from './nls-token.mjs';
import { readFileSync } from 'node:fs';

const { NLS_GATEWAY_URL, buildStartTranscription, buildStopTranscription, createNlsTranscriptState, parseNlsMessage, getNlsEventName, reduceNlsTranscript } = await import(
  './_nls.mjs'
);

const credentials = readNlsCredentials({ ...readDotEnvFile(NLS_LOCAL_ENV_FILE), ...process.env });
if (!credentials.appkey) {
  console.error('缺 appkey（ALIYUN_NLS_APPKEY）');
  process.exit(2);
}

const SPOKEN = process.argv.find((a) => a.startsWith('--say='))?.slice(6) || '青浦区高新技术企业奖励是多少钱';
const DEVICE_RATE = 48000; // 模拟浏览器 AudioContext 的 48k
const CHUNK_SAMPLES = 2048; // 浏览器实际给的 buffer（用户日志里就是 2048）
const CHUNK_MS = (CHUNK_SAMPLES / DEVICE_RATE) * 1000; // ≈42.7ms
const FRAME_BYTES = 3200; // 100ms @16k/16bit/mono

let pass = 0;
let fail = 0;
const check = (name, ok, extra = '') => {
  if (ok) {
    pass++;
    console.log('  ok   ' + name);
  } else {
    fail++;
    console.log('  FAIL ' + name + '  ' + extra);
  }
};

// ① TTS 造语音 → 16k PCM（工具会给 16k，这里再升到 48k 当"设备原始数据"）
const wav = synthesizeSpeechToWav(SPOKEN);
const { pcm: pcm16k } = readAudioAsPcm16kMono(wav);
const samples16k = new Int16Array(pcm16k.buffer, pcm16k.byteOffset, pcm16k.length / 2);
const samples48k = (() => {
  const count = Math.round((samples16k.length * DEVICE_RATE) / 16000);
  const out = new Int16Array(count);
  const step = (samples16k.length - 1) / Math.max(count - 1, 1);
  for (let i = 0; i < count; i++) {
    const pos = i * step;
    const before = Math.floor(pos);
    const after = Math.min(Math.ceil(pos), samples16k.length - 1);
    out[i] = Math.round(samples16k[before] + (samples16k[after] - samples16k[before]) * (pos - before));
  }
  return out;
})();
const float48k = Float32Array.from(samples48k, (v) => v / 32768);

// ② 按 2048 样本切块 → 每块独立重采样（与浏览器一模一样）
const { encodePcm16kMono } = await import('./_nls.mjs');
const chunks = [];
for (let i = 0; i < float48k.length; i += CHUNK_SAMPLES) {
  const slice = float48k.subarray(i, Math.min(i + CHUNK_SAMPLES, float48k.length));
  if (slice.length < CHUNK_SAMPLES) break; // 尾部不足一块丢弃（浏览器也不会给半块）
  chunks.push(encodePcm16kMono(slice, DEVICE_RATE));
}
console.log(`\n【准备】设备 ${DEVICE_RATE}Hz / 每块 ${CHUNK_SAMPLES} 采样（≈${CHUNK_MS.toFixed(1)}ms）`);
console.log(`        共 ${chunks.length} 块，每块编码后约 ${chunks[0]?.length} 字节，总时长 ≈ ${((chunks.length * CHUNK_MS) / 1000).toFixed(2)}s`);

const { token, source } = await resolveNlsToken();
console.log(`【连接】token 来源=${source}`);

const startFrame = buildStartTranscription({ appkey: credentials.appkey });
const taskId = JSON.parse(startFrame).header.task_id;
const socket = new WebSocket(`${NLS_GATEWAY_URL}?token=${encodeURIComponent(token)}`);

let state = createNlsTranscriptState();
const seen = { started: false, completed: false, failed: '', mids: 0, fins: 0 };

const done = new Promise((resolve) => {
  let stopSent = false;
  const stop = () => {
    if (stopSent) return;
    stopSent = true;
    socket.send(buildStopTranscription({ appkey: credentials.appkey, taskId }));
  };

  socket.onopen = () => {
    socket.send(startFrame);
    // ③④ 模拟浏览器：块按 42.7ms 的节奏到，flush 每 50ms 拼帧发出去
    let nextChunkAt = Date.now();
    let chunkIndex = 0;
    let carry = new Uint8Array(0);
    const queue = [];

    const pump = setInterval(() => {
      // 到点的块入队（模拟 onaudioprocess 回调）
      while (chunkIndex < chunks.length && Date.now() >= nextChunkAt) {
        queue.push(chunks[chunkIndex]);
        chunkIndex += 1;
        nextChunkAt += CHUNK_MS;
      }
      if (queue.length && socket.readyState === WebSocket.OPEN) {
        const merged = new Uint8Array(carry.length + queue.reduce((n, c) => n + c.length, 0));
        merged.set(carry, 0);
        let offset = carry.length;
        for (const chunk of queue) {
          merged.set(chunk, offset);
          offset += chunk.length;
        }
        carry = merged;
        queue.length = 0;
      }
      let sent = 0;
      while (carry.length >= FRAME_BYTES && sent < 2) {
        socket.send(carry.subarray(0, FRAME_BYTES));
        carry = carry.subarray(FRAME_BYTES);
        sent += 1;
      }
      if (chunkIndex >= chunks.length && queue.length === 0 && carry.length === 0) {
        clearInterval(pump);
        stop();
      }
    }, 50);
  };

  socket.onmessage = (event) => {
    const message = parseNlsMessage(event.data);
    const name = getNlsEventName(message);
    if (name === 'TranscriptionStarted') seen.started = true;
    if (name === 'TranscriptionCompleted') seen.completed = true;
    if (name === 'TaskFailed') seen.failed = String(message?.header?.status_text || message?.payload?.message || '');
    const { state: next, event: payload } = reduceNlsTranscript(state, message);
    state = next;
    if (payload?.type === 'mid') seen.mids += 1;
    if (payload?.type === 'fin') seen.fins += 1;
    if (name === 'TaskFailed') console.warn('[nls] TaskFailed：', seen.failed);
  };
  socket.onerror = () => resolve();
  setTimeout(() => {
    try {
      socket.close();
    } catch {
      /* ignore */
    }
    resolve();
  }, 40000);
});

await done;

console.log('\n【结果】');
check('收到 TranscriptionStarted', seen.started, seen.failed);
// ⚠️ 实测：收尾后会收到一条 `Gateway:IDLE_TIMEOUT`（"the last directive is 'StartTranscription'"）——
// 那是**本脚本推完音频就 stop、会话随即结束**的产物（网关按"最后一条指令是 start"判空闲），
// 不影响识别结果本身，所以只作提示、不算失败。真要长静音时它可能提前掐会话，
// 与「浏览器不出字」是另一回事（那边一条结果都没回，也没报错）。
if (seen.failed) console.log(`  ℹ️  收尾收到 TaskFailed（预期内）：${seen.failed}`);
check('**收到了中间结果（说明这条路径也能出字）**', seen.mids > 0, `mids=${seen.mids}`);
check('收到了定稿 SentenceEnd', seen.fins > 0, `fins=${seen.fins}`);
const text = state.finalText;
console.log(`  （识别结果：${JSON.stringify(text)}）`);
check('识别文本包含关键词（青浦 / 奖励）', text.includes('青浦') && text.includes('奖励'), JSON.stringify(text));

console.log(`\n===== 通过 ${pass} 项，失败 ${fail} 项 =====`);
process.exit(fail ? 1 : 0);