import { randomUUID } from "node:crypto";
import fs from "node:fs/promises";
import { createRequire } from "node:module";
import path from "node:path";
import type { Readable } from "node:stream";
import { ChannelType, type Client, ReadyListener } from "@buape/carbon";
import type { VoicePlugin } from "@buape/carbon/voice";
import {
  AudioPlayerStatus,
  EndBehaviorType,
  VoiceConnectionStatus,
  createAudioPlayer,
  createAudioResource,
  entersState,
  joinVoiceChannel,
  type AudioPlayer,
  type VoiceConnection,
} from "@discordjs/voice";
import { resolveAgentDir } from "../../../../src/agents/agent-scope.js";
import type { MsgContext } from "../../../../src/auto-reply/templating.js";
import { agentCommandFromIngress } from "../../../../src/commands/agent.js";
import type { RemoteClawConfig } from "../../../../src/config/config.js";
import { isDangerousNameMatchingEnabled } from "../../../../src/config/dangerous-name-matching.js";
import type { DiscordAccountConfig, TtsConfig } from "../../../../src/config/types.js";
import { logVerbose, shouldLogVerbose } from "../../../../src/globals.js";
import { formatErrorMessage } from "../../../../src/infra/errors.js";
import { resolvePreferredRemoteClawTmpDir } from "../../../../src/infra/tmp-remoteclaw-dir.js";
import { createSubsystemLogger } from "../../../../src/logging/subsystem.js";
import {
  buildProviderRegistry,
  createMediaAttachmentCache,
  normalizeMediaAttachments,
  runCapability,
} from "../../../../src/media-understanding/runner.js";
import { resolveAgentRoute } from "../../../../src/routing/resolve-route.js";
import type { RuntimeEnv } from "../../../../src/runtime.js";
import { parseTtsDirectives } from "../../../../src/tts/tts-core.js";
import { resolveTtsConfig, textToSpeech, type ResolvedTtsConfig } from "../../../../src/tts/tts.js";
import { formatMention } from "../mentions.js";
import { resolveDiscordOwnerAccess } from "../monitor/allow-list.js";
import { formatDiscordUserTag } from "../monitor/format.js";

const require = createRequire(import.meta.url);

const SAMPLE_RATE = 48_000;
const CHANNELS = 2;
const BIT_DEPTH = 16;
const MIN_SEGMENT_SECONDS = 0.35;
const SILENCE_DURATION_MS = 1_000;
const PLAYBACK_READY_TIMEOUT_MS = 15_000;
const SPEAKING_READY_TIMEOUT_MS = 60_000;
const DECRYPT_FAILURE_WINDOW_MS = 30_000;
const DECRYPT_FAILURE_RECONNECT_THRESHOLD = 3;
const DECRYPT_FAILURE_PATTERN = /DecryptionFailed\(/;
const SPEAKER_CONTEXT_CACHE_TTL_MS = 60_000;

const logger = createSubsystemLogger("discord/voice");

const logVoiceVerbose = (message: string) => {
  logVerbose(`discord voice: ${message}`);
};

type VoiceOperationResult = {
  ok: boolean;
  message: string;
  channelId?: string;
  guildId?: string;
};

type VoiceSessionEntry = {
  guildId: string;
  channelId: string;
  sessionChannelId: string;
  route: ReturnType<typeof resolveAgentRoute>;
  connection: VoiceConnection;
  player: AudioPlayer;
  playbackQueue: Promise<void>;
  processingQueue: Promise<void>;
  activeSpeakers: Set<string>;
  decryptFailureCount: number;
  lastDecryptFailureAt: number;
  decryptRecoveryInFlight: boolean;
  stop: () => void;
};

function mergeTtsConfig(base: TtsConfig, override?: TtsConfig): TtsConfig {
  if (!override) {
    return base;
  }
  return {
    ...base,
    ...override,
    modelOverrides: {
      ...base.modelOverrides,
      ...override.modelOverrides,
    },
    elevenlabs: {
      ...base.elevenlabs,
      ...override.elevenlabs,
      voiceSettings: {
        ...base.elevenlabs?.voiceSettings,
        ...override.elevenlabs?.voiceSettings,
      },
    },
    openai: {
      ...base.openai,
      ...override.openai,
    },
    edge: {
      ...base.edge,
      ...override.edge,
    },
  };
}

function resolveVoiceTtsConfig(params: { cfg: RemoteClawConfig; override?: TtsConfig }): {
  cfg: RemoteClawConfig;
  resolved: ResolvedTtsConfig;
} {
  if (!params.override) {
    return { cfg: params.cfg, resolved: resolveTtsConfig(params.cfg) };
  }
  const base = params.cfg.messages?.tts ?? {};
  const merged = mergeTtsConfig(base, params.override);
  const messages = params.cfg.messages ?? {};
  const cfg = {
    ...params.cfg,
    messages: {
      ...messages,
      tts: merged,
    },
  };
  return { cfg, resolved: resolveTtsConfig(cfg) };
}

function buildWavBuffer(pcm: Buffer): Buffer {
  const blockAlign = (CHANNELS * BIT_DEPTH) / 8;
  const byteRate = SAMPLE_RATE * blockAlign;
  const header = Buffer.alloc(44);
  header.write("RIFF", 0);
  header.writeUInt32LE(36 + pcm.length, 4);
  header.write("WAVE", 8);
  header.write("fmt ", 12);
  header.writeUInt32LE(16, 16);
  header.writeUInt16LE(1, 20);
  header.writeUInt16LE(CHANNELS, 22);
  header.writeUInt32LE(SAMPLE_RATE, 24);
  header.writeUInt32LE(byteRate, 28);
  header.writeUInt16LE(blockAlign, 32);
  header.writeUInt16LE(BIT_DEPTH, 34);
  header.write("data", 36);
  header.writeUInt32LE(pcm.length, 40);
  return Buffer.concat([header, pcm]);
}

type OpusDecoder = {
  decode: (buffer: Buffer) => Buffer;
};

let warnedOpusMissing = false;

function createOpusDecoder(): { decoder: OpusDecoder; name: string } | null {
  try {
    const OpusScript = require("opusscript") as {
      new (sampleRate: number, channels: number, application: number): OpusDecoder;
      Application: { AUDIO: number };
    };
    const decoder = new OpusScript(SAMPLE_RATE, CHANNELS, OpusScript.Application.AUDIO);
    return { decoder, name: "opusscript" };
  } catch (err) {
    if (!warnedOpusMissing) {
      warnedOpusMissing = true;
      logger.warn(
        `discord voice: opusscript unavailable (${formatErrorMessage(err)}); cannot decode voice audio`,
      );
    }
  }
  return null;
}

async function decodeOpusStream(stream: Readable): Promise<Buffer> {
  const selected = createOpusDecoder();
  if (!selected) {
    return Buffer.alloc(0);
  }
  logVoiceVerbose(`opus decoder: ${selected.name}`);
  const chunks: Buffer[] = [];
  try {
    for await (const chunk of stream) {
      if (!chunk || !(chunk instanceof Buffer) || chunk.length === 0) {
        continue;
      }
      const decoded = selected.decoder.decode(chunk);
      if (decoded && decoded.length > 0) {
        chunks.push(Buffer.from(decoded));
      }
    }
  } catch (err) {
    if (shouldLogVerbose()) {
      logVerbose(`discord voice: opus decode failed: ${formatErrorMessage(err)}`);
    }
  }
  return chunks.length > 0 ? Buffer.concat(chunks) : Buffer.alloc(0);
}

function estimateDurationSeconds(pcm: Buffer): number {
  const bytesPerSample = (BIT_DEPTH / 8) * CHANNELS;
  if (bytesPerSample <= 0) {
    return 0;
  }
  return pcm.length / (bytesPerSample * SAMPLE_RATE);
}

async function writeWavFile(pcm: Buffer): Promise<{ path: string; durationSeconds: number }> {
  const tempDir = await fs.mkdtemp(path.join(resolvePreferredRemoteClawTmpDir(), "discord-voice-"));
  const filePath = path.join(tempDir, `segment-${randomUUID()}.wav`);
  const wav = buildWavBuffer(pcm);
  await fs.writeFile(filePath, wav);
  scheduleTempCleanup(tempDir);
  return { path: filePath, durationSeconds: estimateDurationSeconds(pcm) };
}

function scheduleTempCleanup(tempDir: string, delayMs: number = 30 * 60 * 1000): void {
  const timer = setTimeout(() => {
    fs.rm(tempDir, { recursive: true, force: true }).catch((err) => {
      if (shouldLogVerbose()) {
        logVerbose(`discord voice: temp cleanup failed for ${tempDir}: ${formatErrorMessage(err)}`);
      }
    });
  }, delayMs);
  timer.unref();
}

async function transcribeAudio(params: {
  cfg: RemoteClawConfig;
  agentId: string;
  filePath: string;
}): Promise<string | undefined> {
  const ctx: MsgContext = {
    MediaPath: params.filePath,
    MediaType: "audio/wav",
  };
  const attachments = normalizeMediaAttachments(ctx);
  if (attachments.length === 0) {
    return undefined;
  }
  const cache = createMediaAttachmentCache(attachments);
  const providerRegistry = buildProviderRegistry();
  try {
    const result = await runCapability({
      capability: "audio",
      cfg: params.cfg,
      ctx,
      attachments: cache,
      media: attachments,
      agentDir: resolveAgentDir(params.cfg, params.agentId),
      providerRegistry,
      config: params.cfg.tools?.media?.audio,
    });
    const typedResult = result as { outputs: Array<{ kind: string; text?: string }> };
    const output = typedResult.outputs.find(
      (entry: { kind: string }) => entry.kind === "audio.transcription",
    );
    const text = output?.text?.trim();
    return text || undefined;
  } finally {
    await (cache as { cleanup: () => Promise<void> }).cleanup();
  }
}

export class DiscordVoiceManager {
  private sessions = new Map<string, VoiceSessionEntry>();
  private botUserId?: string;
  private readonly voiceEnabled: boolean;
  private autoJoinTask: Promise<void> | null = null;
  private readonly ownerAllowFrom: string[];
  private readonly allowDangerousNameMatching: boolean;
  private readonly speakerContextCache = new Map<
    string,
    {
      label: string;
      senderIsOwner: boolean;
      expiresAt: number;
    }
  >();

  constructor(
    private params: {
      client: Client;
      cfg: RemoteClawConfig;
      discordConfig: DiscordAccountConfig;
      accountId: string;
      runtime: RuntimeEnv;
      botUserId?: string;
    },
  ) {
    this.botUserId = params.botUserId;
    this.voiceEnabled = params.discordConfig.voice?.enabled !== false;
    this.ownerAllowFrom =
      params.discordConfig.allowFrom ?? params.discordConfig.dm?.allowFrom ?? [];
    this.allowDangerousNameMatching = isDangerousNameMatchingEnabled(params.discordConfig);
  }

  setBotUserId(id?: string) {
    if (id) {
      this.botUserId = id;
    }
  }

  isEnabled() {
    return this.voiceEnabled;
  }

  async autoJoin(): Promise<void> {
    if (!this.voiceEnabled) {
      return;
    }
    if (this.autoJoinTask) {
      return this.autoJoinTask;
    }
    this.autoJoinTask = (async () => {
      const entries = this.params.discordConfig.voice?.autoJoin ?? [];
      logVoiceVerbose(`autoJoin: ${entries.length} entries`);
      const seenGuilds = new Set<string>();
      for (const entry of entries) {
        const guildId = entry.guildId.trim();
        if (!guildId) {
          continue;
        }
        if (seenGuilds.has(guildId)) {
          logger.warn(
            `discord voice: autoJoin has multiple entries for guild ${guildId}; skipping`,
          );
          continue;
        }
        seenGuilds.add(guildId);
        logVoiceVerbose(`autoJoin: joining guild ${guildId} channel ${entry.channelId}`);
        await this.join({
          guildId: entry.guildId,
          channelId: entry.channelId,
        });
      }
    })().finally(() => {
      this.autoJoinTask = null;
    });
    return this.autoJoinTask;
  }

  status(): VoiceOperationResult[] {
    return Array.from(this.sessions.values()).map((session) => ({
      ok: true,
      message: `connected: guild ${session.guildId} channel ${session.channelId}`,
      guildId: session.guildId,
      channelId: session.channelId,
    }));
  }

  async join(params: { guildId: string; channelId: string }): Promise<VoiceOperationResult> {
    if (!this.voiceEnabled) {
      return {
        ok: false,
        message: "Discord voice is disabled (channels.discord.voice.enabled).",
      };
    }
    const guildId = params.guildId.trim();
    const channelId = params.channelId.trim();
    if (!guildId || !channelId) {
      return { ok: false, message: "Missing guildId or channelId." };
    }
    logVoiceVerbose(`join requested: guild ${guildId} channel ${channelId}`);

    const existing = this.sessions.get(guildId);
    if (existing && existing.channelId === channelId) {
      logVoiceVerbose(`join: already connected to guild ${guildId} channel ${channelId}`);
      return {
        ok: true,
        message: `Already connected to ${formatMention({ channelId })}.`,
        guildId,
        channelId,
      };
    }
    if (existing) {
      logVoiceVerbose(`join: replacing existing session for guild ${guildId}`);
      await this.leave({ guildId });
    }

    const channelInfo = await this.params.client.fetchChannel(channelId).catch(() => null);
    if (!channelInfo || ("type" in channelInfo && !isVoiceChannel(channelInfo.type))) {
      return { ok: false, message: `Channel ${channelId} is not a voice channel.` };
    }
    const channelGuildId = "guildId" in channelInfo ? channelInfo.guildId : undefined;
    if (channelGuildId && channelGuildId !== guildId) {
      return { ok: false, message: "Voice channel is not in this guild." };
    }

    const voicePlugin = this.params.client.getPlugin<VoicePlugin>("voice");
    if (!voicePlugin) {
      return { ok: false, message: "Discord voice plugin is not available." };
    }

    const adapterCreator = voicePlugin.getGatewayAdapterCreator(guildId);
    const daveEncryption = this.params.discordConfig.voice?.daveEncryption;
    const decryptionFailureTolerance = this.params.discordConfig.voice?.decryptionFailureTolerance;
    logVoiceVerbose(
      `join: DAVE settings encryption=${daveEncryption === false ? "off" : "on"} tolerance=${
        decryptionFailureTolerance ?? "default"
      }`,
    );
    const connection = joinVoiceChannel({
      channelId,
      guildId,
      adapterCreator,
      selfDeaf: false,
      selfMute: false,
      daveEncryption,
      decryptionFailureTolerance,
    });

    try {
      await entersState(connection, VoiceConnectionStatus.Ready, PLAYBACK_READY_TIMEOUT_MS);
      logVoiceVerbose(`join: connected to guild ${guildId} channel ${channelId}`);
    } catch (err) {
      connection.destroy();
      return { ok: false, message: `Failed to join voice channel: ${formatErrorMessage(err)}` };
    }

    const sessionChannelId = channelInfo?.id ?? channelId;
    // Use the voice channel id as the session channel so text chat in the voice channel
    // shares the same session as spoken audio.
    if (sessionChannelId !== channelId) {
      logVoiceVerbose(
        `join: using session channel ${sessionChannelId} for voice channel ${channelId}`,
      );
    }
    const route = resolveAgentRoute({
      cfg: this.params.cfg,
      channel: "discord",
      accountId: this.params.accountId,
      guildId,
      peer: { kind: "channel", id: sessionChannelId },
    });

    const player = createAudioPlayer();
    connection.subscribe(player);

    let speakingHandler: ((userId: string) => void) | undefined;
    let disconnectedHandler: (() => Promise<void>) | undefined;
    let destroyedHandler: (() => void) | undefined;
    let playerErrorHandler: ((err: Error) => void) | undefined;
    const clearSessionIfCurrent = () => {
      const active = this.sessions.get(guildId);
      if (active?.connection === connection) {
        this.sessions.delete(guildId);
      }
    };

    const entry: VoiceSessionEntry = {
      guildId,
      channelId,
      sessionChannelId,
      route,
      connection,
      player,
      playbackQueue: Promise.resolve(),
      processingQueue: Promise.resolve(),
      activeSpeakers: new Set(),
      decryptFailureCount: 0,
      lastDecryptFailureAt: 0,
      decryptRecoveryInFlight: false,
      stop: () => {
        if (speakingHandler) {
          connection.receiver.speaking.off("start", speakingHandler);
        }
        if (disconnectedHandler) {
          connection.off(VoiceConnectionStatus.Disconnected, disconnectedHandler);
        }
        if (destroyedHandler) {
          connection.off(VoiceConnectionStatus.Destroyed, destroyedHandler);
        }
        if (playerErrorHandler) {
          player.off("error", playerErrorHandler);
        }
        player.stop();
        connection.destroy();
      },
    };

    speakingHandler = (userId: string) => {
      void this.handleSpeakingStart(entry, userId).catch((err) => {
        logger.warn(`discord voice: capture failed: ${formatErrorMessage(err)}`);
      });
    };

    disconnectedHandler = async () => {
      try {
        await Promise.race([
          entersState(connection, VoiceConnectionStatus.Signalling, 5_000),
          entersState(connection, VoiceConnectionStatus.Connecting, 5_000),
        ]);
      } catch {
        clearSessionIfCurrent();
        connection.destroy();
      }
    };
    destroyedHandler = () => {
      clearSessionIfCurrent();
    };
    playerErrorHandler = (err: Error) => {
      logger.warn(`discord voice: playback error: ${formatErrorMessage(err)}`);
    };

    connection.receiver.speaking.on("start", speakingHandler);
    connection.on(VoiceConnectionStatus.Disconnected, disconnectedHandler);
    connection.on(VoiceConnectionStatus.Destroyed, destroyedHandler);
    player.on("error", playerErrorHandler);

    this.sessions.set(guildId, entry);
    return {
      ok: true,
      message: `Joined ${formatMention({ channelId })}.`,
      guildId,
      channelId,
    };
  }

  async leave(params: { guildId: string; channelId?: string }): Promise<VoiceOperationResult> {
    const guildId = params.guildId.trim();
    logVoiceVerbose(`leave requested: guild ${guildId} channel ${params.channelId ?? "current"}`);
    const entry = this.sessions.get(guildId);
    if (!entry) {
      return { ok: false, message: "Not connected to a voice channel." };
    }
    if (params.channelId && params.channelId !== entry.channelId) {
      return { ok: false, message: "Not connected to that voice channel." };
    }
    entry.stop();
    this.sessions.delete(guildId);
    logVoiceVerbose(`leave: disconnected from guild ${guildId} channel ${entry.channelId}`);
    return {
      ok: true,
      message: `Left ${formatMention({ channelId: entry.channelId })}.`,
      guildId,
      channelId: entry.channelId,
    };
  }

  async destroy(): Promise<void> {
    for (const entry of this.sessions.values()) {
      entry.stop();
    }
    this.sessions.clear();
  }

  private enqueueProcessing(entry: VoiceSessionEntry, task: () => Promise<void>) {
    entry.processingQueue = entry.processingQueue
      .then(task)
      .catch((err) => logger.warn(`discord voice: processing failed: ${formatErrorMessage(err)}`));
  }

  private enqueuePlayback(entry: VoiceSessionEntry, task: () => Promise<void>) {
    entry.playbackQueue = entry.playbackQueue
      .then(task)
      .catch((err) => logger.warn(`discord voice: playback failed: ${formatErrorMessage(err)}`));
  }

  private async handleSpeakingStart(entry: VoiceSessionEntry, userId: string) {
    if (!userId || entry.activeSpeakers.has(userId)) {
      return;
    }
    if (this.botUserId && userId === this.botUserId) {
      return;
    }

    entry.activeSpeakers.add(userId);
    logVoiceVerbose(
      `capture start: guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
    );
    if (entry.player.state.status === AudioPlayerStatus.Playing) {
      entry.player.stop(true);
    }

    const stream = entry.connection.receiver.subscribe(userId, {
      end: {
        behavior: EndBehaviorType.AfterSilence,
        duration: SILENCE_DURATION_MS,
      },
    });
    stream.on("error", (err) => {
      this.handleReceiveError(entry, err);
    });

    try {
      const pcm = await decodeOpusStream(stream);
      if (pcm.length === 0) {
        logVoiceVerbose(
          `capture empty: guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
        );
        return;
      }
      this.resetDecryptFailureState(entry);
      const { path: wavPath, durationSeconds } = await writeWavFile(pcm);
      if (durationSeconds < MIN_SEGMENT_SECONDS) {
        logVoiceVerbose(
          `capture too short (${durationSeconds.toFixed(2)}s): guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
        );
        return;
      }
      logVoiceVerbose(
        `capture ready (${durationSeconds.toFixed(2)}s): guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
      );
      this.enqueueProcessing(entry, async () => {
        await this.processSegment({ entry, wavPath, userId, durationSeconds });
      });
    } finally {
      entry.activeSpeakers.delete(userId);
    }
  }

  private async processSegment(params: {
    entry: VoiceSessionEntry;
    wavPath: string;
    userId: string;
    durationSeconds: number;
  }) {
    const { entry, wavPath, userId, durationSeconds } = params;
    logVoiceVerbose(
      `segment processing (${durationSeconds.toFixed(2)}s): guild ${entry.guildId} channel ${entry.channelId}`,
    );
    const transcript = await transcribeAudio({
      cfg: this.params.cfg,
      agentId: entry.route.agentId,
      filePath: wavPath,
    });
    if (!transcript) {
      logVoiceVerbose(
        `transcription empty: guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
      );
      return;
    }
    logVoiceVerbose(
      `transcription ok (${transcript.length} chars): guild ${entry.guildId} channel ${entry.channelId}`,
    );

    const speaker = await this.resolveSpeakerContext(entry.guildId, userId);
    const prompt = speaker.label ? `${speaker.label}: ${transcript}` : transcript;

    const result = await agentCommandFromIngress(
      {
        message: prompt,
        sessionKey: entry.route.sessionKey,
        agentId: entry.route.agentId,
        messageChannel: "discord",
        senderIsOwner: speaker.senderIsOwner,
        deliver: false,
      },
      this.params.runtime,
    );

    const replyText = (result.payloads ?? [])
      .map((payload) => payload.text)
      .filter((text) => typeof text === "string" && text.trim())
      .join("\n")
      .trim();

    if (!replyText) {
      logVoiceVerbose(
        `reply empty: guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
      );
      return;
    }
    logVoiceVerbose(
      `reply ok (${replyText.length} chars): guild ${entry.guildId} channel ${entry.channelId}`,
    );

    const { cfg: ttsCfg, resolved: ttsConfig } = resolveVoiceTtsConfig({
      cfg: this.params.cfg,
      override: this.params.discordConfig.voice?.tts,
    });
    const directive = parseTtsDirectives(
      replyText,
      ttsConfig.modelOverrides,
      ttsConfig.openai.baseUrl,
    );
    const speakText = directive.overrides.ttsText ?? directive.cleanedText.trim();
    if (!speakText) {
      logVoiceVerbose(
        `tts skipped (empty): guild ${entry.guildId} channel ${entry.channelId} user ${userId}`,
      );
      return;
    }

    const ttsResult = await textToSpeech({
      text: speakText,
      cfg: ttsCfg,
      channel: "discord",
      overrides: directive.overrides,
    });
    if (!ttsResult.success || !ttsResult.audioPath) {
      logger.warn(`discord voice: TTS failed: ${ttsResult.error ?? "unknown error"}`);
      return;
    }
    const audioPath = ttsResult.audioPath;
    logVoiceVerbose(
      `tts ok (${speakText.length} chars): guild ${entry.guildId} channel ${entry.channelId}`,
    );

    this.enqueuePlayback(entry, async () => {
      logVoiceVerbose(
        `playback start: guild ${entry.guildId} channel ${entry.channelId} file ${path.basename(audioPath)}`,
      );
      const resource = createAudioResource(audioPath);
      entry.player.play(resource);
      await entersState(entry.player, AudioPlayerStatus.Playing, PLAYBACK_READY_TIMEOUT_MS).catch(
        () => undefined,
      );
      await entersState(entry.player, AudioPlayerStatus.Idle, SPEAKING_READY_TIMEOUT_MS).catch(
        () => undefined,
      );
      logVoiceVerbose(`playback done: guild ${entry.guildId} channel ${entry.channelId}`);
    });
  }

  private handleReceiveError(entry: VoiceSessionEntry, err: unknown) {
    const message = formatErrorMessage(err);
    logger.warn(`discord voice: receive error: ${message}`);
    if (!DECRYPT_FAILURE_PATTERN.test(message)) {
      return;
    }
    const now = Date.now();
    if (now - entry.lastDecryptFailureAt > DECRYPT_FAILURE_WINDOW_MS) {
      entry.decryptFailureCount = 0;
    }
    entry.lastDecryptFailureAt = now;
    entry.decryptFailureCount += 1;
    if (entry.decryptFailureCount === 1) {
      logger.warn(
        "discord voice: DAVE decrypt failures detected; voice receive may be unstable (upstream: discordjs/discord.js#11419)",
      );
    }
    if (
      entry.decryptFailureCount < DECRYPT_FAILURE_RECONNECT_THRESHOLD ||
      entry.decryptRecoveryInFlight
    ) {
      return;
    }
    entry.decryptRecoveryInFlight = true;
    this.resetDecryptFailureState(entry);
    void this.recoverFromDecryptFailures(entry)
      .catch((recoverErr) =>
        logger.warn(`discord voice: decrypt recovery failed: ${formatErrorMessage(recoverErr)}`),
      )
      .finally(() => {
        entry.decryptRecoveryInFlight = false;
      });
  }

  private resetDecryptFailureState(entry: VoiceSessionEntry) {
    entry.decryptFailureCount = 0;
    entry.lastDecryptFailureAt = 0;
  }

  private async recoverFromDecryptFailures(entry: VoiceSessionEntry) {
    const active = this.sessions.get(entry.guildId);
    if (!active || active.connection !== entry.connection) {
      return;
    }
    logger.warn(
      `discord voice: repeated decrypt failures; attempting rejoin for guild ${entry.guildId} channel ${entry.channelId}`,
    );
    const leaveResult = await this.leave({ guildId: entry.guildId });
    if (!leaveResult.ok) {
      logger.warn(`discord voice: decrypt recovery leave failed: ${leaveResult.message}`);
      return;
    }
    const result = await this.join({ guildId: entry.guildId, channelId: entry.channelId });
    if (!result.ok) {
      logger.warn(`discord voice: rejoin after decrypt failures failed: ${result.message}`);
    }
  }

  private resolveSpeakerIsOwner(params: { id: string; name?: string; tag?: string }): boolean {
    return resolveDiscordOwnerAccess({
      allowFrom: this.ownerAllowFrom,
      sender: {
        id: params.id,
        name: params.name,
        tag: params.tag,
      },
      allowNameMatching: this.allowDangerousNameMatching,
    }).ownerAllowed;
  }

  private resolveSpeakerContextCacheKey(guildId: string, userId: string): string {
    return `${guildId}:${userId}`;
  }

  private getCachedSpeakerContext(
    guildId: string,
    userId: string,
  ):
    | {
        label: string;
        senderIsOwner: boolean;
      }
    | undefined {
    const key = this.resolveSpeakerContextCacheKey(guildId, userId);
    const cached = this.speakerContextCache.get(key);
    if (!cached) {
      return undefined;
    }
    if (cached.expiresAt <= Date.now()) {
      this.speakerContextCache.delete(key);
      return undefined;
    }
    return {
      label: cached.label,
      senderIsOwner: cached.senderIsOwner,
    };
  }

  private setCachedSpeakerContext(
    guildId: string,
    userId: string,
    context: { label: string; senderIsOwner: boolean },
  ): void {
    const key = this.resolveSpeakerContextCacheKey(guildId, userId);
    this.speakerContextCache.set(key, {
      label: context.label,
      senderIsOwner: context.senderIsOwner,
      expiresAt: Date.now() + SPEAKER_CONTEXT_CACHE_TTL_MS,
    });
  }

  private async resolveSpeakerContext(
    guildId: string,
    userId: string,
  ): Promise<{
    label: string;
    senderIsOwner: boolean;
  }> {
    const cached = this.getCachedSpeakerContext(guildId, userId);
    if (cached) {
      return cached;
    }
    const identity = await this.resolveSpeakerIdentity(guildId, userId);
    const context = {
      label: identity.label,
      senderIsOwner: this.resolveSpeakerIsOwner({
        id: identity.id,
        name: identity.name,
        tag: identity.tag,
      }),
    };
    this.setCachedSpeakerContext(guildId, userId, context);
    return context;
  }

  private async resolveSpeakerIdentity(
    guildId: string,
    userId: string,
  ): Promise<{
    id: string;
    label: string;
    name?: string;
    tag?: string;
  }> {
    try {
      const member = await this.params.client.fetchMember(guildId, userId);
      const username = member.user?.username ?? undefined;
      return {
        id: userId,
        label: member.nickname ?? member.user?.globalName ?? username ?? userId,
        name: username,
        tag: member.user ? formatDiscordUserTag(member.user) : undefined,
      };
    } catch {
      try {
        const user = await this.params.client.fetchUser(userId);
        const username = user.username ?? undefined;
        return {
          id: userId,
          label: user.globalName ?? username ?? userId,
          name: username,
          tag: formatDiscordUserTag(user),
        };
      } catch {
        return { id: userId, label: userId };
      }
    }
  }
}

export class DiscordVoiceReadyListener extends ReadyListener {
  constructor(private manager: DiscordVoiceManager) {
    super();
  }

  async handle() {
    await this.manager.autoJoin();
  }
}

function isVoiceChannel(type: ChannelType) {
  return type === ChannelType.GuildVoice || type === ChannelType.GuildStageVoice;
}