(() => {
  "use strict";

  const TARGET_SAMPLE_RATE = 16000;
  const MAX_RECORDING_MS = 28000;
  const IDLE_BUFFER_RESET_MS = 8000;
  const ENDPOINT_SILENCE_MS = 1050;
  const WAKE_FOLLOWUP_TIMEOUT_MS = 6500;
  const PREVIEW_INTERVAL_MS = 850;
  const MIN_PREVIEW_AUDIO_MS = 320;
  const STATUS_RESET_MS = 5000;
  const MICROPHONE_CONNECT_TIMEOUT_MS = 12000;
  const DEFAULT_WAKE_WORD = "你好，小迪";
  const PREFERRED_MICROPHONE = /TAKSTAR\s*V2/i;
  const ACTIVE_PHASES = new Set(["arming", "armed", "capturing", "finalizing"]);
  const DEBUG = new URLSearchParams(window.location.search).get("speechDebug") === "1"
    || window.localStorage.getItem("speechDebug") === "1";

  const speech = {
    phase: "idle",
    backendReady: false,
    wakeWord: DEFAULT_WAKE_WORD,
    inputMode: "wake",
    assistantOpen: false,
    microphonePermissionGranted: false,
    permissionStatus: null,
    wakeRestartTimer: null,
    stream: null,
    context: null,
    contextPromise: null,
    workletReady: false,
    workletFailed: false,
    source: null,
    captureNode: null,
    silentGain: null,
    chunks: [],
    totalSamples: 0,
    sampleRate: 0,
    startedAt: 0,
    speechStartSample: null,
    lastVoiceSample: null,
    consecutiveVoiceSamples: 0,
    noiseFloor: 0.003,
    statusTimer: null,
    statusPollTimer: null,
    generation: 0,
    utteranceId: "",
    finishPromise: null,
    endpointPromise: null,
    endpointing: false,
    previewSequence: 0,
    lastAppliedPreviewSequence: 0,
    lastPreviewAt: 0,
    previewIntervalMs: PREVIEW_INTERVAL_MS,
    previewInFlight: null,
    previewQueued: false,
    previewController: null,
    finalController: null,
    wakeDetected: false,
    wakeDetectedAt: 0,
    lastLiveText: "",
    applyingResult: false,
    lastResult: null,
  };

  const elements = () => ({
    button: document.querySelector("#speechDictationButton"),
    composer: document.querySelector("#speechDictationButton")?.closest(".command-composer"),
    input: document.querySelector("#utterance"),
    status: document.querySelector("#speechDictationStatus"),
    hiddenLabel: document.querySelector("#speechDictationButton .speech-visually-hidden"),
  });

  function debug(stage, details = {}) {
    if (!DEBUG) return;
    console.debug("[speech]", { utteranceId: speech.utteranceId, stage, ...details });
  }

  function announce(message) {
    const notify = window.CognitiveAgentConsole?.notify;
    if (typeof notify === "function") notify(message);
  }

  function phaseLabel(phase) {
    if (phase === "warming") return "语音模型正在后台加载";
    if (phase === "arming") return speech.inputMode === "manual"
      ? "正在开始语音输入"
      : "正在开启语音唤醒";
    if (phase === "armed") return `开始语音输入，后台唤醒词：${speech.wakeWord}`;
    if (phase === "capturing") return "结束本次语音输入";
    if (phase === "finalizing") return "正在整理语音内容";
    return "开始语音输入";
  }

  function configuredWakeWord(status) {
    const primary = status?.wake_word && typeof status.wake_word === "object"
      ? status.wake_word.primary
      : "";
    return String(primary || DEFAULT_WAKE_WORD).trim() || DEFAULT_WAKE_WORD;
  }

  function speechStatusReadiness(status, responseOk = true) {
    const loadState = String(status?.load_state || status?.warmup?.state || "idle");
    return {
      loadState,
      ready: responseOk && status?.enabled === true
        && (status.loaded === true || !["loading", "error"].includes(loadState)),
    };
  }

  function setPhase(phase, message = "") {
    speech.phase = phase;
    const { button, composer, status, hiddenLabel } = elements();
    if (!button || !composer || !status) return;
    window.clearTimeout(speech.statusTimer);
    composer.dataset.speechState = phase;
    status.textContent = message;
    button.classList.toggle("is-armed", phase === "armed");
    button.classList.toggle("is-listening", phase === "capturing");
    button.classList.toggle("is-processing", ["arming", "finalizing"].includes(phase));
    button.disabled = ["warming", "arming", "finalizing"].includes(phase)
      || (!speech.backendReady && !["armed", "capturing"].includes(phase));
    button.setAttribute("aria-pressed", String(["armed", "capturing"].includes(phase)));
    const label = phaseLabel(phase);
    button.setAttribute("aria-label", label);
    button.title = phase === "warming"
      ? "语音模型正在后台加载"
      : phase === "armed"
      ? `正在后台等待“${speech.wakeWord}”，点击立即开始录音`
      : phase === "capturing"
        ? "正在实时转录，点击可结束"
        : speech.backendReady
          ? "开始语音输入"
          : "语音识别模型未就绪";
    if (hiddenLabel) hiddenLabel.textContent = label;
    window.dispatchEvent(new CustomEvent("cognitive-agent:speech-state", {
      detail: { phase, message, input_mode: speech.inputMode, wake_word: speech.wakeWord },
    }));
    if (["success", "error"].includes(phase)) {
      speech.statusTimer = window.setTimeout(() => setPhase("idle"), STATUS_RESET_MS);
    }
  }

  function microphoneErrorMessage(error) {
    switch (error?.name) {
      case "NotAllowedError":
        return "未获得麦克风权限，请在浏览器地址栏允许访问麦克风。";
      case "NotFoundError":
        return "没有找到可用麦克风，请检查 TAKSTAR V2 接收器。";
      case "NotReadableError":
        return "麦克风正被其他程序占用，请关闭占用程序后重试。";
      case "OverconstrainedError":
        return "TAKSTAR V2 当前不可用，请重新连接接收器。";
      case "SecurityError":
        return "当前页面不允许访问麦克风，请使用 HTTPS 或本机地址。";
      case "TimeoutError":
        return "等待麦克风授权超时，请允许访问后重试。";
      default:
        return "无法启动麦克风，请检查设备连接和浏览器权限。";
    }
  }

  function backgroundWakeEligible() {
    return speech.backendReady
      && speech.assistantOpen
      && !document.hidden
      && !ACTIVE_PHASES.has(speech.phase)
      && !speech.stream;
  }

  function handleMicrophonePermissionChange() {
    const state = speech.permissionStatus?.state || "unknown";
    speech.microphonePermissionGranted = state === "granted";
    if (state === "denied" && speech.stream) {
      void cancelDictation("麦克风权限已关闭", { silent: speech.inputMode === "wake" });
      return;
    }
    if (state === "granted") scheduleWakeStandby();
  }

  async function microphonePermissionState() {
    if (speech.permissionStatus) {
      if (speech.permissionStatus.state === "denied") return "denied";
      if (speech.microphonePermissionGranted) return "granted";
      return speech.permissionStatus.state;
    }
    if (!navigator.permissions?.query) {
      return speech.microphonePermissionGranted ? "granted" : "unknown";
    }
    try {
      const status = await navigator.permissions.query({ name: "microphone" });
      speech.permissionStatus = status;
      status.addEventListener?.("change", handleMicrophonePermissionChange);
      return status.state;
    } catch (_error) {
      return speech.microphonePermissionGranted ? "granted" : "unknown";
    }
  }

  async function maybeStartWakeStandby() {
    window.clearTimeout(speech.wakeRestartTimer);
    speech.wakeRestartTimer = null;
    if (!backgroundWakeEligible()) return false;
    const permissionState = await microphonePermissionState();
    if (permissionState !== "granted" || !backgroundWakeEligible()) {
      debug("wake_autostart_skipped", { permissionState });
      return false;
    }
    return startWakeStandby({ automatic: true });
  }

  function scheduleWakeStandby(delay = 0) {
    window.clearTimeout(speech.wakeRestartTimer);
    speech.wakeRestartTimer = window.setTimeout(() => {
      void maybeStartWakeStandby();
    }, delay);
  }

  function setAssistantOpen(open) {
    speech.assistantOpen = Boolean(open);
    window.clearTimeout(speech.wakeRestartTimer);
    speech.wakeRestartTimer = null;
    if (!speech.assistantOpen) {
      const stopping = cancelDictation("AI助手已收起，语音输入已停止", { silent: true });
      void stopping.finally(() => {
        // The drawer can be reopened while AudioContext suspension is still
        // finishing. Re-check the latest UI state so that race does not lose
        // the background wake listener.
        if (speech.assistantOpen) scheduleWakeStandby();
      });
      return stopping;
    }
    scheduleWakeStandby();
    return Promise.resolve();
  }

  async function getUserMediaWithTimeout(constraints) {
    let expired = false;
    let timer = 0;
    const request = navigator.mediaDevices.getUserMedia(constraints);
    const timeout = new Promise((_, reject) => {
      timer = window.setTimeout(() => {
        expired = true;
        reject(new DOMException("microphone permission timed out", "TimeoutError"));
      }, MICROPHONE_CONNECT_TIMEOUT_MS);
    });
    request.then((lateStream) => {
      if (expired) lateStream.getTracks().forEach((track) => track.stop());
    }).catch(() => {});
    try {
      return await Promise.race([request, timeout]);
    } finally {
      window.clearTimeout(timer);
    }
  }

  async function preferredMicrophoneStream() {
    const constraints = {
      channelCount: 1,
      echoCancellation: true,
      noiseSuppression: true,
      autoGainControl: true,
    };
    let stream = await getUserMediaWithTimeout({ audio: constraints, video: false });
    const currentTrack = stream.getAudioTracks()[0];
    const devices = await navigator.mediaDevices.enumerateDevices();
    const preferred = devices.find(
      (device) => device.kind === "audioinput" && PREFERRED_MICROPHONE.test(device.label),
    );
    if (preferred && preferred.deviceId !== currentTrack?.getSettings?.().deviceId) {
      stream.getTracks().forEach((track) => track.stop());
      stream = await getUserMediaWithTimeout({
        audio: { ...constraints, deviceId: { exact: preferred.deviceId } },
        video: false,
      });
    }
    return stream;
  }

  async function ensureAudioContext() {
    if (speech.context && speech.context.state !== "closed") {
      await speech.context.resume();
      return speech.context;
    }
    if (speech.contextPromise) return speech.contextPromise;
    speech.contextPromise = (async () => {
      const AudioContext = window.AudioContext || window.webkitAudioContext;
      const context = new AudioContext({ latencyHint: "interactive" });
      await context.resume();
      if (context.audioWorklet && window.AudioWorkletNode) {
        try {
          await context.audioWorklet.addModule("/speech-audio-worklet.js?v=sensevoice-5");
          speech.workletReady = true;
        } catch (error) {
          speech.workletFailed = true;
          debug("audio_worklet_fallback", { message: error?.message || String(error) });
        }
      } else {
        speech.workletFailed = true;
      }
      speech.context = context;
      return context;
    })();
    try {
      return await speech.contextPromise;
    } finally {
      speech.contextPromise = null;
    }
  }

  function audioRms(samples) {
    let sum = 0;
    for (let index = 0; index < samples.length; index += 1) sum += samples[index] * samples[index];
    return Math.sqrt(sum / Math.max(1, samples.length));
  }

  function newUtteranceId(generation = speech.generation) {
    return `web-${crypto.randomUUID?.() || `${Date.now()}-${generation}`}`;
  }

  function resetAttempt({ rotateUtterance = true } = {}) {
    if (rotateUtterance) speech.utteranceId = newUtteranceId();
    speech.chunks = [];
    speech.totalSamples = 0;
    speech.startedAt = performance.now();
    speech.speechStartSample = null;
    speech.lastVoiceSample = null;
    speech.consecutiveVoiceSamples = 0;
    speech.noiseFloor = 0.003;
    speech.previewSequence = 0;
    speech.lastAppliedPreviewSequence = 0;
    speech.lastPreviewAt = 0;
    speech.previewQueued = false;
    speech.wakeDetected = false;
    speech.wakeDetectedAt = 0;
    speech.lastLiveText = "";
  }

  function clearLegacySpeechGuard(input) {
    if (!input) return;
    delete input.dataset.speechUncertain;
    delete input.dataset.speechExecutionEligible;
    delete input.dataset.speechSemanticStatus;
    delete input.dataset.speechValue;
  }

  function replaceInput(value, stage) {
    const { input } = elements();
    if (!input) return;
    speech.applyingResult = true;
    clearLegacySpeechGuard(input);
    input.value = String(value || "").slice(0, input.maxLength || 4000);
    input.dataset.speechStage = stage;
    input.dataset.speechUtteranceId = speech.utteranceId;
    input.dispatchEvent(new Event("input", { bubbles: true }));
    speech.applyingResult = false;
    input.focus({ preventScroll: true });
  }

  function concatenateChunks({ trimEnd = false } = {}) {
    const combined = new Float32Array(speech.totalSamples);
    let offset = 0;
    for (const chunk of speech.chunks) {
      combined.set(chunk, offset);
      offset += chunk.length;
    }
    const start = Math.max(0, Math.floor(speech.speechStartSample || 0));
    const end = trimEnd
      ? Math.min(
        combined.length,
        Math.ceil((speech.lastVoiceSample || combined.length) + (speech.sampleRate * 0.45)),
      )
      : combined.length;
    return combined.slice(start, end);
  }

  function downsample(samples, inputRate) {
    if (inputRate === TARGET_SAMPLE_RATE) return samples;
    const ratio = inputRate / TARGET_SAMPLE_RATE;
    const output = new Float32Array(Math.max(1, Math.floor(samples.length / ratio)));
    for (let outputIndex = 0; outputIndex < output.length; outputIndex += 1) {
      const start = Math.floor(outputIndex * ratio);
      const end = Math.max(start + 1, Math.min(samples.length, Math.floor((outputIndex + 1) * ratio)));
      let sum = 0;
      for (let inputIndex = start; inputIndex < end; inputIndex += 1) sum += samples[inputIndex];
      output[outputIndex] = sum / (end - start);
    }
    return output;
  }

  function encodePcm16Wav(samples) {
    const buffer = new ArrayBuffer(44 + (samples.length * 2));
    const view = new DataView(buffer);
    const writeAscii = (offset, value) => {
      for (let index = 0; index < value.length; index += 1) view.setUint8(offset + index, value.charCodeAt(index));
    };
    writeAscii(0, "RIFF");
    view.setUint32(4, 36 + (samples.length * 2), true);
    writeAscii(8, "WAVE");
    writeAscii(12, "fmt ");
    view.setUint32(16, 16, true);
    view.setUint16(20, 1, true);
    view.setUint16(22, 1, true);
    view.setUint32(24, TARGET_SAMPLE_RATE, true);
    view.setUint32(28, TARGET_SAMPLE_RATE * 2, true);
    view.setUint16(32, 2, true);
    view.setUint16(34, 16, true);
    writeAscii(36, "data");
    view.setUint32(40, samples.length * 2, true);
    for (let index = 0; index < samples.length; index += 1) {
      const sample = Math.max(-1, Math.min(1, samples[index]));
      view.setInt16(44 + (index * 2), sample < 0 ? sample * 32768 : sample * 32767, true);
    }
    return buffer;
  }

  function previewWav() {
    if (speech.speechStartSample === null || !speech.sampleRate) return null;
    const samples = concatenateChunks();
    if ((samples.length / speech.sampleRate) * 1000 < MIN_PREVIEW_AUDIO_MS) return null;
    return encodePcm16Wav(downsample(samples, speech.sampleRate));
  }

  function applyPreview(result, { generation, utteranceId, requestedSequence }) {
    if (generation !== speech.generation || utteranceId !== speech.utteranceId) return false;
    const sequence = Number(result.sequence ?? requestedSequence);
    if (!Number.isFinite(sequence) || result.stale === true
      || sequence <= speech.lastAppliedPreviewSequence) {
      debug("preview_ignored", { sequence, stale: result.stale === true });
      return false;
    }
    speech.lastAppliedPreviewSequence = sequence;
    const wakeWord = result.wake_word && typeof result.wake_word === "object"
      ? result.wake_word
      : {};
    const manualInput = speech.inputMode === "manual";
    const detectedWake = manualInput || wakeWord.detected === true;
    const liveText = String(manualInput
      ? (result.live_text || result.raw_text || result.text || "")
      : (wakeWord.remainder ?? result.live_text ?? "")).trim();

    if (!speech.wakeDetected && detectedWake) {
      speech.wakeDetected = true;
      speech.wakeDetectedAt = performance.now();
      if (wakeWord.configured_word) speech.wakeWord = String(wakeWord.configured_word);
      setPhase("capturing", manualInput
        ? "正在实时转录…"
        : liveText
          ? "已唤醒，正在实时转录…"
          : "已唤醒，请继续说…");
      replaceInput("", "partial");
      if (!manualInput) window.CognitiveAgentAssistant?.open?.();
      debug(manualInput ? "manual_preview_started" : "wake_detected", {
        wakeWord: speech.wakeWord,
        sequence,
      });
    }
    if (speech.wakeDetected && liveText) {
      speech.lastLiveText = liveText;
      replaceInput(liveText, "partial");
      setPhase("capturing", "正在实时转录…");
    }
    window.dispatchEvent(new CustomEvent("cognitive-agent:speech-preview", { detail: result }));
    return true;
  }

  async function requestPreview({ force = false } = {}) {
    if (!["armed", "capturing"].includes(speech.phase)) return null;
    if (speech.previewInFlight) {
      speech.previewQueued = true;
      return speech.previewInFlight;
    }
    const wav = previewWav();
    if (!wav) return null;
    const now = performance.now();
    if (!force && now - speech.lastPreviewAt < speech.previewIntervalMs) return null;
    speech.lastPreviewAt = now;
    const generation = speech.generation;
    const utteranceId = speech.utteranceId;
    const requestedSequence = speech.previewSequence + 1;
    speech.previewSequence = requestedSequence;
    const controller = new AbortController();
    speech.previewController = controller;
    const timeout = window.setTimeout(() => controller.abort("preview_timeout"), 12000);
    speech.previewInFlight = (async () => {
      try {
        const response = await fetch("/api/speech/preview", {
          method: "POST",
          credentials: "same-origin",
          cache: "no-store",
          headers: {
            Accept: "application/json",
            "Content-Type": "audio/wav",
            "X-Speech-Utterance-Id": utteranceId,
            "X-Speech-Preview-Sequence": String(requestedSequence),
            "X-Speech-Input-Mode": speech.inputMode,
          },
          body: wav,
          signal: controller.signal,
        });
        const payload = await response.json().catch(() => ({}));
        if (!response.ok) throw new Error(payload.message || `实时转录失败（HTTP ${response.status}）`);
        applyPreview(payload, { generation, utteranceId, requestedSequence });
        debug("preview_result", { sequence: requestedSequence, payload });
        return payload;
      } catch (error) {
        if (error?.name !== "AbortError" && generation === speech.generation) {
          debug("preview_failed", { sequence: requestedSequence, message: error?.message || String(error) });
        }
        return null;
      } finally {
        window.clearTimeout(timeout);
      }
    })();
    try {
      return await speech.previewInFlight;
    } finally {
      speech.previewInFlight = null;
      if (speech.previewController === controller) speech.previewController = null;
      const queued = speech.previewQueued;
      speech.previewQueued = false;
      // Audio callbacks will schedule the next preview after the cadence has
      // elapsed. Do not immediately replay a queued request: that would turn a
      // warm offline decoder into an unbounded request loop under continuous
      // speech. Endpoint flushing below still forces the newest snapshot.
      if (queued) debug("preview_coalesced", { sequence: requestedSequence });
    }
  }

  async function flushPreview() {
    if (speech.previewInFlight) await speech.previewInFlight;
    if (!["armed", "capturing"].includes(speech.phase)) return null;
    speech.previewQueued = false;
    return requestPreview({ force: true });
  }

  async function handleEndpoint(generation) {
    if (speech.endpointPromise || generation !== speech.generation) return;
    speech.endpointPromise = (async () => {
      speech.endpointing = true;
      try {
        if (speech.phase === "armed" && speech.inputMode === "wake") {
          await flushPreview();
          if (generation !== speech.generation) return;
          if (!speech.wakeDetected) {
            resetAttempt();
            setPhase("armed", `未检测到唤醒词，请说“${speech.wakeWord}”`);
            return;
          }
        }
        if (speech.phase !== "capturing") return;
        if (!speech.lastLiveText && speech.inputMode === "wake") {
          speech.lastVoiceSample = null;
          speech.consecutiveVoiceSamples = 0;
          setPhase("capturing", "已唤醒，请继续说…");
          return;
        }
        await finishDictation();
      } finally {
        speech.endpointing = false;
      }
    })();
    try {
      await speech.endpointPromise;
    } finally {
      speech.endpointPromise = null;
    }
  }

  function handleAudio(chunk, generation) {
    if (!["armed", "capturing"].includes(speech.phase) || generation !== speech.generation) return;
    speech.chunks.push(chunk);
    speech.totalSamples += chunk.length;
    const now = performance.now();
    const elapsed = now - speech.startedAt;
    const rms = audioRms(chunk);
    if (speech.speechStartSample === null) {
      speech.noiseFloor = (speech.noiseFloor * 0.92) + (rms * 0.08);
    }
    const voiceThreshold = Math.max(0.009, Math.min(0.035, speech.noiseFloor * 2.8));
    if (rms >= voiceThreshold) {
      speech.consecutiveVoiceSamples += chunk.length;
      if (speech.consecutiveVoiceSamples >= speech.sampleRate * 0.09) {
        if (speech.speechStartSample === null) {
          speech.speechStartSample = Math.max(0, speech.totalSamples - (speech.sampleRate * 0.35));
          setPhase(speech.wakeDetected ? "capturing" : "armed", speech.wakeDetected
            ? "正在实时转录…"
            : `正在确认唤醒词“${speech.wakeWord}”…`);
          debug("speech_started", { sample: speech.speechStartSample, voiceThreshold });
        }
        speech.lastVoiceSample = speech.totalSamples;
      }
    } else {
      speech.consecutiveVoiceSamples = 0;
    }

    if (speech.speechStartSample !== null) {
      void requestPreview();
      const speechDurationMs = ((speech.totalSamples - speech.speechStartSample) / speech.sampleRate) * 1000;
      if (
        speech.lastVoiceSample !== null
        && speech.totalSamples - speech.lastVoiceSample >= speech.sampleRate * (ENDPOINT_SILENCE_MS / 1000)
      ) {
        void handleEndpoint(generation);
      } else if (speechDurationMs >= MAX_RECORDING_MS) {
        if (speech.inputMode === "manual" || (speech.wakeDetected && speech.lastLiveText)) {
          void finishDictation();
        }
        else void cancelDictation(`未检测到完整问题，请重新说“${speech.wakeWord}”`);
      }
    } else if (elapsed >= IDLE_BUFFER_RESET_MS) {
      if (speech.inputMode === "manual") {
        void cancelDictation("未检测到说话声，请重试")
          .then(() => scheduleWakeStandby(1200));
      } else {
        resetAttempt();
        setPhase("armed", `正在等待“${speech.wakeWord}”`);
      }
    }

    if (speech.inputMode === "wake" && speech.phase === "capturing"
      && !speech.lastLiveText && speech.wakeDetectedAt
      && now - speech.wakeDetectedAt >= WAKE_FOLLOWUP_TIMEOUT_MS) {
      void cancelDictation("唤醒后未检测到问题，请重试");
    }
  }

  function connectCapture(context, generation) {
    speech.source = context.createMediaStreamSource(speech.stream);
    speech.silentGain = context.createGain();
    speech.silentGain.gain.value = 0;
    if (speech.workletReady && !speech.workletFailed) {
      speech.captureNode = new AudioWorkletNode(context, "speech-capture-processor", {
        numberOfInputs: 1,
        numberOfOutputs: 1,
        channelCount: 1,
      });
      speech.captureNode.port.onmessage = (event) => {
        handleAudio(new Float32Array(event.data), generation);
      };
      debug("capture_connected", { implementation: "AudioWorklet" });
    } else {
      speech.captureNode = context.createScriptProcessor(2048, 1, 1);
      speech.captureNode.onaudioprocess = (event) => {
        handleAudio(new Float32Array(event.inputBuffer.getChannelData(0)), generation);
      };
      debug("capture_connected", { implementation: "ScriptProcessor-fallback" });
    }
    speech.source.connect(speech.captureNode);
    speech.captureNode.connect(speech.silentGain);
    speech.silentGain.connect(context.destination);
  }

  async function startCapture(inputMode, { automatic = false } = {}) {
    if (!speech.backendReady) {
      if (!automatic) setPhase("error", "语音识别模型未就绪");
      return false;
    }
    if (!window.isSecureContext || !navigator.mediaDevices?.getUserMedia) {
      if (!automatic) {
        setPhase("error", "请使用 HTTPS 或 127.0.0.1 开启语音输入");
        announce("当前页面不支持安全的麦克风访问");
      }
      return false;
    }
    if (ACTIVE_PHASES.has(speech.phase)) return false;
    if (automatic) {
      const permissionState = await microphonePermissionState();
      if (permissionState !== "granted" || !backgroundWakeEligible()) return false;
    }
    const generation = speech.generation + 1;
    speech.generation = generation;
    speech.inputMode = inputMode;
    resetAttempt();
    if (inputMode === "manual") {
      speech.wakeDetected = true;
      speech.wakeDetectedAt = performance.now();
    }
    try {
      setPhase("arming", inputMode === "manual" ? "正在开始录音…" : "正在连接唤醒监听…");
      const stream = await preferredMicrophoneStream();
      speech.microphonePermissionGranted = true;
      if (generation !== speech.generation || document.hidden
        || (automatic && !speech.assistantOpen)) {
        stream.getTracks().forEach((track) => track.stop());
        return false;
      }
      speech.stream = stream;
      const context = await ensureAudioContext();
      if (generation !== speech.generation) {
        stream.getTracks().forEach((track) => track.stop());
        if (speech.stream === stream) speech.stream = null;
        return false;
      }
      speech.sampleRate = context.sampleRate;
      connectCapture(context, generation);
      const trackLabel = stream.getAudioTracks()[0]?.label || "默认麦克风";
      if (inputMode === "manual") {
        replaceInput("", "partial");
        setPhase("capturing", `正在实时转录 · ${trackLabel}`);
        debug("manual_capture_started", { sampleRate: speech.sampleRate, trackLabel });
      } else {
        setPhase("armed", `后台等待“${speech.wakeWord}” · ${trackLabel}`);
        debug("wake_listener_started", { sampleRate: speech.sampleRate, trackLabel });
      }
      return true;
    } catch (error) {
      if (generation !== speech.generation) return false;
      await releaseMicrophone();
      if (error?.name === "NotAllowedError") speech.microphonePermissionGranted = false;
      const message = microphoneErrorMessage(error);
      if (automatic) {
        setPhase("idle");
        debug("wake_listener_unavailable", { message });
      } else {
        setPhase("error", message);
        announce(message);
      }
      return false;
    }
  }

  async function startManualDictation() {
    window.clearTimeout(speech.wakeRestartTimer);
    speech.wakeRestartTimer = null;
    if (speech.phase === "capturing") return finishDictation();
    if (speech.phase === "armed" && speech.stream) {
      abortRequests("manual_capture_started");
      speech.inputMode = "manual";
      resetAttempt();
      speech.wakeDetected = true;
      speech.wakeDetectedAt = performance.now();
      replaceInput("", "partial");
      setPhase("capturing", "正在实时转录…");
      debug("wake_standby_promoted_to_manual", { sampleRate: speech.sampleRate });
      return true;
    }
    if (ACTIVE_PHASES.has(speech.phase)) return false;
    return startCapture("manual");
  }

  async function startWakeStandby({ automatic = true } = {}) {
    if (speech.phase === "armed" && speech.inputMode === "wake" && speech.stream) return true;
    if (ACTIVE_PHASES.has(speech.phase)) return false;
    return startCapture("wake", { automatic });
  }

  function abortRequests(reason = "speech_cancelled") {
    speech.previewController?.abort(reason);
    speech.finalController?.abort(reason);
    speech.previewController = null;
    speech.finalController = null;
  }

  async function releaseMicrophone({ closeContext = false } = {}) {
    if (speech.captureNode?.port) speech.captureNode.port.onmessage = null;
    if (speech.captureNode && "onaudioprocess" in speech.captureNode) {
      speech.captureNode.onaudioprocess = null;
    }
    for (const node of [speech.source, speech.captureNode, speech.silentGain]) {
      try { node?.disconnect(); } catch (_error) { /* already disconnected */ }
    }
    speech.stream?.getTracks().forEach((track) => track.stop());
    speech.stream = null;
    speech.source = null;
    speech.captureNode = null;
    speech.silentGain = null;
    if (closeContext && speech.context && speech.context.state !== "closed") {
      try { await speech.context.close(); } catch (_error) { /* page is closing */ }
      speech.context = null;
      speech.workletReady = false;
      speech.workletFailed = false;
    } else if (speech.context?.state === "running") {
      try { await speech.context.suspend(); } catch (_error) { /* already suspended */ }
    }
  }

  async function transcribe(wav, utteranceId, inputMode = speech.inputMode) {
    const controller = new AbortController();
    speech.finalController = controller;
    const timeout = window.setTimeout(() => controller.abort("final_timeout"), 45000);
    try {
      const response = await fetch("/api/speech/transcribe", {
        method: "POST",
        credentials: "same-origin",
        cache: "no-store",
        headers: {
          Accept: "application/json",
          "Content-Type": "audio/wav",
          "X-Speech-Utterance-Id": utteranceId,
          "X-Speech-Input-Mode": inputMode,
          "X-Speech-Wake-Word-Required": inputMode === "wake" ? "1" : "0",
        },
        body: wav,
        signal: controller.signal,
      });
      const payload = await response.json().catch(() => ({}));
      if (!response.ok) throw new Error(payload.message || `语音转写失败（HTTP ${response.status}）`);
      debug("server_result", payload);
      return payload;
    } finally {
      window.clearTimeout(timeout);
      if (speech.finalController === controller) speech.finalController = null;
    }
  }

  function applyResult(result) {
    const { input } = elements();
    if (!input) throw new Error("没有找到 AI助手输入框");
    const assistantText = String(
      result.assistant_text || result.clean_text || result.live_text || result.raw_text || result.text || "",
    ).trim();
    if (!assistantText) {
      window.dispatchEvent(new CustomEvent("cognitive-agent:speech-result", { detail: result }));
      return false;
    }
    replaceInput(assistantText, "final");
    input.dataset.speechValue = input.value.trim();
    window.dispatchEvent(new CustomEvent("cognitive-agent:speech-result", { detail: result }));
    return true;
  }

  async function finishDictation() {
    if (speech.finishPromise) return speech.finishPromise;
    if (speech.phase !== "capturing"
      || (speech.inputMode === "wake" && !speech.wakeDetected)) return undefined;
    speech.finishPromise = (async () => {
      const generation = speech.generation;
      const inputMode = speech.inputMode;
      const hadSpeech = speech.speechStartSample !== null;
      const samples = hadSpeech ? concatenateChunks({ trimEnd: true }) : null;
      const inputRate = speech.sampleRate;
      const utteranceId = speech.utteranceId;
      setPhase("finalizing", "说话结束，正在整理表达…");
      speech.endpointing = true;
      speech.previewController?.abort("speech_finalizing");
      await releaseMicrophone();
      speech.chunks = [];
      if (!hadSpeech || !samples?.length) {
        setPhase("error", "未检测到有效问题，请重试");
        scheduleWakeStandby(1200);
        return;
      }
      try {
        const wav = encodePcm16Wav(downsample(samples, inputRate));
        const result = await transcribe(wav, utteranceId, inputMode);
        if (generation !== speech.generation) return;
        speech.lastResult = result;
        const applied = applyResult(result);
        const latency = Math.round(result.timings?.total_ms ?? result.inference_ms ?? 0);
        if (!applied) {
          setPhase("error", "没有识别出有效内容，请重试");
          return;
        }
        setPhase("success", latency > 0 ? `语音已整理 · ${latency} ms` : "语音已整理，可以发送");
        announce("语音内容已整理，可以发送给 AI助手");
      } catch (error) {
        if (generation !== speech.generation) return;
        const message = error?.name === "AbortError" ? "语音转写已取消或超时，请重试。" : error.message;
        setPhase("error", message || "语音转写失败，请重试");
        announce(message || "语音转写失败");
      } finally {
        speech.endpointing = false;
        if (generation === speech.generation) scheduleWakeStandby(1200);
      }
    })();
    try {
      return await speech.finishPromise;
    } finally {
      speech.finishPromise = null;
    }
  }

  async function cancelDictation(message = "已关闭语音唤醒", { silent = false } = {}) {
    window.clearTimeout(speech.wakeRestartTimer);
    speech.wakeRestartTimer = null;
    if (!ACTIVE_PHASES.has(speech.phase) && !speech.stream) return;
    speech.generation += 1;
    speech.endpointing = false;
    speech.previewQueued = false;
    abortRequests();
    await releaseMicrophone();
    speech.chunks = [];
    if (silent) setPhase("idle");
    else setPhase("error", message);
  }

  async function loadSpeechStatus() {
    const { button } = elements();
    if (!button) return;
    if (!window.isSecureContext || !navigator.mediaDevices?.getUserMedia) {
      button.disabled = true;
      setPhase("error", "语音唤醒需要 HTTPS 或本机地址");
      return;
    }
    try {
      const response = await fetch("/api/speech/status", {
        credentials: "same-origin",
        cache: "no-store",
        headers: { Accept: "application/json" },
      });
      const status = await response.json();
      const { loadState, ready } = speechStatusReadiness(status, response.ok);
      speech.backendReady = ready;
      speech.wakeWord = configuredWakeWord(status);
      const recommendedPreviewInterval = Number(status.live_preview?.recommended_interval_ms);
      if (Number.isFinite(recommendedPreviewInterval)) {
        speech.previewIntervalMs = Math.max(350, Math.min(2000, recommendedPreviewInterval));
      }
      debug("backend_status", status);
      window.clearTimeout(speech.statusPollTimer);
      if (response.ok && status.enabled === true && loadState === "loading") {
        setPhase("warming", "语音模型正在后台加载，完成后即可唤醒…");
        speech.statusPollTimer = window.setTimeout(loadSpeechStatus, 1000);
      } else {
        setPhase("idle");
        if (speech.backendReady) scheduleWakeStandby();
      }
      if (!speech.backendReady && loadState !== "loading") {
        button.disabled = true;
        button.title = loadState === "error"
          ? "SenseVoiceSmall 模型加载失败"
          : "SenseVoiceSmall 模型未部署";
      }
    } catch (_error) {
      speech.backendReady = false;
      button.disabled = true;
      button.title = "无法连接语音识别服务";
    }
  }

  function clearSpeechGuardOnManualEdit(event) {
    if (speech.applyingResult || !event.isTrusted) return;
    const { input } = elements();
    clearLegacySpeechGuard(input);
    if (input) {
      delete input.dataset.speechStage;
      delete input.dataset.speechUtteranceId;
    }
    const formalCaptureActive = speech.phase === "capturing"
      || speech.phase === "finalizing"
      || (speech.phase === "arming" && speech.inputMode === "manual");
    if (formalCaptureActive) {
      void cancelDictation("已停止语音输入，保留手工编辑内容", { silent: true });
    }
  }

  function initialize() {
    const { button, input } = elements();
    if (!button) return;
    button.addEventListener("click", () => {
      if (speech.phase === "capturing") void finishDictation();
      else void startManualDictation();
    });
    input?.addEventListener("input", clearSpeechGuardOnManualEdit);
    document.addEventListener("keydown", (event) => {
      if (event.key === "Escape" && ACTIVE_PHASES.has(speech.phase)) {
        event.preventDefault();
        void cancelDictation();
      }
    });
    document.addEventListener("visibilitychange", () => {
      if (document.hidden) void cancelDictation("页面已隐藏，语音输入已停止", { silent: true });
      else scheduleWakeStandby();
    });
    window.addEventListener("pagehide", () => {
      window.clearTimeout(speech.statusPollTimer);
      window.clearTimeout(speech.wakeRestartTimer);
      speech.permissionStatus?.removeEventListener?.("change", handleMicrophonePermissionChange);
      speech.generation += 1;
      abortRequests("page_hidden");
      void releaseMicrophone({ closeContext: true });
    });
    void loadSpeechStatus();
  }

  window.CognitiveAgentSpeech = {
    get lastResult() { return speech.lastResult; },
    get phase() { return speech.phase; },
    get wakeWord() { return speech.wakeWord; },
    get inputMode() { return speech.inputMode; },
    get debugEnabled() { return DEBUG; },
    startManualDictation,
    startWakeStandby,
    setAssistantOpen,
    stop(message = "已关闭语音唤醒") {
      return cancelDictation(message, { silent: true });
    },
  };
  if (window.__N7WEB_SPEECH_TEST__ === true) {
    window.CognitiveAgentSpeech.__test = {
      applyPreview,
      applyResult,
      configuredWakeWord,
      speechStatusReadiness,
      startManualDictation,
      startWakeStandby,
      finishDictation,
      handleAudio,
      cancelDictation,
      releaseMicrophone,
      transcribe,
      initialize,
      setAssistantOpen,
      setPhase,
      state: speech,
    };
  }
  document.addEventListener("DOMContentLoaded", initialize);
})();