'use client';

import { memo, useCallback, useEffect, useMemo, useRef, useState } from 'react';
import * as tus from 'tus-js-client';
import { toast } from 'sonner';
import { toastApiError } from '@/lib/client/api-error';
import {
  Download,
  FileVideo,
  Image as ImageIcon,
  Loader2,
  Mic,
  Pause,
  Play,
  Square,
  UploadCloud,
  Volume2,
  X,
  Youtube,
} from 'lucide-react';
import { Button } from '@/components/ui/button';
import { Badge } from '@/components/ui/badge';
import { Input } from '@/components/ui/input';
import { Tabs, TabsList, TabsTrigger } from '@/components/ui/tabs';
import { Dialog, DialogContent, DialogTitle } from '@/components/ui/dialog';
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from '@/components/ui/dropdown-menu';
import { ImagePreviewDialog } from '@/components/video-page/image-preview-dialog';
import {
  BunnyPreviewPlayer,
  type BunnyPreviewPlayerHandle,
} from '@/components/video-page/bunny-preview-player';
import { AssetListSection } from '@/components/video-page/asset-list-section';
import type {
  AssetDownloadPreference,
  DirectUploadProvider,
  VideoAsset,
} from '@/components/video-page/types';
import { uploadAssetVideoToR2 } from '@/lib/client/r2-asset-video-upload';
import {
  extractPastedImageFiles,
  validateImageFile,
} from '@/components/video-page/image-upload-utils';
import { useCommentMedia } from '@/components/video-page/hooks/use-comment-media';
import { withWebmDuration } from '@/lib/webm-duration';
import { resolvePublicBunnyCdnHostname } from '@/lib/bunny-cdn';
import { cn } from '@/lib/utils';

const MAX_AUDIO_UPLOAD_SIZE = 10 * 1024 * 1024; // 10MB
const MAX_AUDIO_UPLOAD_SIZE_MESSAGE = 'File too large. Maximum size is 10MB.';

function formatTime(seconds: number): string {
  const s = Math.floor(seconds);
  return `${String(Math.floor(s / 60)).padStart(2, '0')}:${String(s % 60).padStart(2, '0')}`;
}

type UploadAudioResponse = {
  data?: { url?: string; reservationId?: string | null };
  error?: string;
  code?: string;
};

function getAudioUploadValidationError(file: Blob): string | null {
  if (file.size > MAX_AUDIO_UPLOAD_SIZE) {
    return MAX_AUDIO_UPLOAD_SIZE_MESSAGE;
  }
  return null;
}

async function readUploadAudioResponse(response: Response): Promise<UploadAudioResponse | null> {
  const raw = await response.text().catch(() => '');
  const trimmed = raw.trim();
  if (!trimmed) return null;

  try {
    return JSON.parse(trimmed) as UploadAudioResponse;
  } catch {
    if (trimmed.startsWith('<')) return null;
    return { error: trimmed };
  }
}

interface AssetsPaneProps {
  videoId: string;
  assets: VideoAsset[];
  isLoadingAssets: boolean;
  isCreatingAsset: boolean;
  deletingAssetIds: string[];
  activeDownloadAssetId: string | null;
  canUploadAssets: boolean;
  canDownloadAssets: boolean;
  getGuestUploadToken: (intent: 'image' | 'audio') => Promise<string | null>;
  createAsset: (payload: {
    provider: 'R2_IMAGE' | 'YOUTUBE' | 'BUNNY' | 'R2_AUDIO' | 'R2_VIDEO';
    displayName?: string;
    sourceUrl: string;
    providerVideoId?: string;
    thumbnailUrl?: string;
    uploadToken?: string;
    objectKey?: string;
    reservationId?: string | null;
  }) => Promise<VideoAsset | null>;
  deleteAsset: (assetId: string) => Promise<boolean>;
  downloadAsset: (asset: VideoAsset, preference?: AssetDownloadPreference) => Promise<void>;
  hasMoreAssets: boolean;
  isLoadingMoreAssets: boolean;
  loadMoreAssets: () => Promise<void>;
  highlightedAssetId: string | null;
  onHighlightedAssetHandled: () => void;
  directUploadProvider?: DirectUploadProvider;
}

export const AssetsPane = memo(function AssetsPane({
  videoId,
  assets,
  isLoadingAssets,
  isCreatingAsset,
  deletingAssetIds,
  activeDownloadAssetId,
  canUploadAssets,
  canDownloadAssets,
  getGuestUploadToken,
  createAsset,
  deleteAsset,
  downloadAsset,
  hasMoreAssets,
  isLoadingMoreAssets,
  loadMoreAssets,
  highlightedAssetId,
  onHighlightedAssetHandled,
  directUploadProvider = 'bunny',
}: AssetsPaneProps) {
  const [uploadTab, setUploadTab] = useState<'image' | 'youtube' | 'bunny' | 'voice'>('image');
  const [imageTitle, setImageTitle] = useState('');
  const [pendingImageFiles, setPendingImageFiles] = useState<File[]>([]);
  const [youtubeUrl, setYoutubeUrl] = useState('');
  const [youtubeTitle, setYoutubeTitle] = useState('');
  const [bunnyTitle, setBunnyTitle] = useState('');
  const [isUploadingImage, setIsUploadingImage] = useState(false);
  const [isUploadingBunny, setIsUploadingBunny] = useState(false);
  const [bunnyProgress, setBunnyProgress] = useState(0);
  const [bunnyUploadLabel, setBunnyUploadLabel] = useState('');
  const [bunnyProcessingByAssetId, setBunnyProcessingByAssetId] = useState<Record<string, boolean>>(
    {}
  );
  const [bunnyReadyByAssetId, setBunnyReadyByAssetId] = useState<Record<string, boolean>>({});
  const [bunnyThumbnailRetryKeyByAssetId, setBunnyThumbnailRetryKeyByAssetId] = useState<
    Record<string, number>
  >({});
  const [bunnyThumbnailLoadErrorByAssetId, setBunnyThumbnailLoadErrorByAssetId] = useState<
    Record<string, boolean>
  >({});
  const [previewImage, setPreviewImage] = useState<string | null>(null);
  const [previewImageTitle, setPreviewImageTitle] = useState<string | null>(null);
  const [selectedAsset, setSelectedAsset] = useState<VideoAsset | null>(null);
  const bunnyCdnHostname = useMemo(() => resolvePublicBunnyCdnHostname(), []);
  const [focusedAssetId, setFocusedAssetId] = useState<string | null>(null);
  const bunnyPreviewPlayerRef = useRef<BunnyPreviewPlayerHandle | null>(null);
  const youtubeIframeRef = useRef<HTMLIFrameElement | null>(null);
  const youtubePreviewStateRef = useRef({ currentTime: 0, isPlaying: false, isMuted: false });
  const imageInputRef = useRef<HTMLInputElement>(null);
  const bunnyInputRef = useRef<HTMLInputElement>(null);
  const voiceInputRef = useRef<HTMLInputElement>(null);

  // Voice recording state
  const [voiceTitle, setVoiceTitle] = useState('');
  const [isRecording, setIsRecording] = useState(false);
  const [recordingTime, setRecordingTime] = useState(0);
  const [audioBlob, setAudioBlob] = useState<Blob | null>(null);
  const [audioBlobUrl, setAudioBlobUrl] = useState<string | null>(null);
  const [pendingAudioFiles, setPendingAudioFiles] = useState<File[]>([]);
  const [isUploadingVoice, setIsUploadingVoice] = useState(false);
  const mediaRecorderRef = useRef<MediaRecorder | null>(null);
  const audioChunksRef = useRef<BlobPart[]>([]);
  const recordingTimerRef = useRef<ReturnType<typeof setInterval> | null>(null);
  const recordingStartedAtRef = useRef(0);

  // Drag-drop state
  const [isDragOver, setIsDragOver] = useState(false);
  const dragCounterRef = useRef(0);

  // Audio playback for asset preview dialog and recording preview
  const {
    playingVoiceId,
    voiceProgress,
    voiceCurrentTime,
    voicePlaybackRate,
    playVoice,
    stopVoice,
    toggleVoiceSpeed,
  } = useCommentMedia();

  const sortedAssets = useMemo(() => {
    return [...assets].sort((a, b) => +new Date(b.createdAt) - +new Date(a.createdAt));
  }, [assets]);

  useEffect(() => {
    if (!highlightedAssetId) return;

    const element = document.getElementById(`asset-card-${highlightedAssetId}`);
    if (element) {
      element.scrollIntoView({ behavior: 'smooth', block: 'center' });
      setFocusedAssetId(highlightedAssetId);
      window.setTimeout(
        () => setFocusedAssetId((prev) => (prev === highlightedAssetId ? null : prev)),
        2500
      );
    }

    onHighlightedAssetHandled();
  }, [highlightedAssetId, onHighlightedAssetHandled]);

  useEffect(() => {
    if (!selectedAsset || selectedAsset.kind !== 'VIDEO') return;

    const sendYouTubeCommand = (func: string, args: unknown[] = []) => {
      const iframe = youtubeIframeRef.current;
      if (!iframe?.contentWindow) return;
      iframe.contentWindow.postMessage(
        JSON.stringify({
          event: 'command',
          func,
          args,
        }),
        '*'
      );
    };

    const onMessage = (event: MessageEvent) => {
      if (!selectedAsset || selectedAsset.provider !== 'YOUTUBE') return;
      if (typeof event.data !== 'string') return;
      let parsed: unknown;
      try {
        parsed = JSON.parse(event.data);
      } catch {
        return;
      }
      const info = (
        parsed as { info?: { currentTime?: number; playerState?: number; muted?: boolean } }
      )?.info;
      if (!info) return;
      if (typeof info.currentTime === 'number') {
        youtubePreviewStateRef.current.currentTime = info.currentTime;
      }
      if (typeof info.playerState === 'number') {
        youtubePreviewStateRef.current.isPlaying = info.playerState === 1;
      }
      if (typeof info.muted === 'boolean') {
        youtubePreviewStateRef.current.isMuted = info.muted;
      }
    };

    const onKeyDown = (event: KeyboardEvent) => {
      if (!selectedAsset || selectedAsset.kind !== 'VIDEO') return;
      const target = event.target as HTMLElement | null;
      if (
        target &&
        (target.tagName === 'INPUT' || target.tagName === 'TEXTAREA' || target.isContentEditable)
      )
        return;

      const handledKeys = new Set([
        'Space',
        'KeyK',
        'ArrowLeft',
        'ArrowRight',
        'KeyJ',
        'KeyL',
        'KeyM',
        'Escape',
      ]);
      if (!handledKeys.has(event.code)) return;

      event.preventDefault();
      event.stopPropagation();

      if (event.code === 'Escape') {
        setSelectedAsset(null);
        return;
      }

      if (selectedAsset.provider === 'BUNNY') {
        switch (event.code) {
          case 'Space':
          case 'KeyK':
            bunnyPreviewPlayerRef.current?.togglePlayPause();
            break;
          case 'ArrowLeft':
          case 'KeyJ':
            bunnyPreviewPlayerRef.current?.seekBy(-10);
            break;
          case 'ArrowRight':
          case 'KeyL':
            bunnyPreviewPlayerRef.current?.seekBy(10);
            break;
          case 'KeyM':
            bunnyPreviewPlayerRef.current?.toggleMute();
            break;
        }
        return;
      }

      if (selectedAsset.provider === 'YOUTUBE') {
        switch (event.code) {
          case 'Space':
          case 'KeyK': {
            const isPlaying = youtubePreviewStateRef.current.isPlaying;
            sendYouTubeCommand(isPlaying ? 'pauseVideo' : 'playVideo');
            youtubePreviewStateRef.current.isPlaying = !isPlaying;
            break;
          }
          case 'ArrowLeft':
          case 'KeyJ': {
            const next = Math.max(0, youtubePreviewStateRef.current.currentTime - 10);
            sendYouTubeCommand('seekTo', [next, true]);
            youtubePreviewStateRef.current.currentTime = next;
            break;
          }
          case 'ArrowRight':
          case 'KeyL': {
            const next = youtubePreviewStateRef.current.currentTime + 10;
            sendYouTubeCommand('seekTo', [next, true]);
            youtubePreviewStateRef.current.currentTime = next;
            break;
          }
          case 'KeyM': {
            const isMuted = youtubePreviewStateRef.current.isMuted;
            sendYouTubeCommand(isMuted ? 'unMute' : 'mute');
            youtubePreviewStateRef.current.isMuted = !isMuted;
            break;
          }
        }
      }
    };

    window.addEventListener('keydown', onKeyDown, true);
    window.addEventListener('message', onMessage);
    return () => {
      window.removeEventListener('keydown', onKeyDown, true);
      window.removeEventListener('message', onMessage);
    };
  }, [selectedAsset]);

  useEffect(() => {
    if (!selectedAsset || selectedAsset.provider !== 'BUNNY') return;
    if (bunnyReadyByAssetId[selectedAsset.id]) return;
    setBunnyProcessingByAssetId((prev) =>
      prev[selectedAsset.id] ? prev : { ...prev, [selectedAsset.id]: true }
    );
  }, [bunnyReadyByAssetId, selectedAsset]);

  const uploadSingleImageAsset = useCallback(
    async (file: File, displayName?: string): Promise<boolean> => {
      const imageError = await validateImageFile(file);
      if (imageError) {
        toast.error(`${file.name}: ${imageError}`);
        return false;
      }

      try {
        const formData = new FormData();
        formData.append('image', file);
        formData.append('videoId', videoId);
        const guestUploadToken = await getGuestUploadToken('image');
        if (guestUploadToken) formData.append('uploadToken', guestUploadToken);

        const uploadRes = await fetch('/api/upload/image', {
          method: 'POST',
          body: formData,
        });
        const uploadPayload = (await uploadRes.json().catch(() => null)) as {
          data?: { url?: string; reservationId?: string | null };
          error?: string;
          code?: string;
        } | null;
        const uploadedImageUrl = uploadPayload?.data?.url;
        if (!uploadRes.ok || !uploadedImageUrl) {
          toastApiError(uploadPayload, 'Failed to upload image', { prefix: file.name });
          return false;
        }

        const created = await createAsset({
          provider: 'R2_IMAGE',
          sourceUrl: uploadedImageUrl,
          displayName: displayName?.trim() || file.name,
          reservationId: uploadPayload?.data?.reservationId ?? null,
        });
        return !!created;
      } catch (error) {
        console.error('Failed to upload image asset:', error);
        toastApiError(error, 'Failed to upload image', { prefix: file.name });
        return false;
      }
    },
    [videoId, getGuestUploadToken, createAsset]
  );

  const handleImageUpload = useCallback(
    async (files: File[]) => {
      if (files.length === 0) return;

      setIsUploadingImage(true);
      let successCount = 0;
      let failCount = 0;

      try {
        for (const file of files) {
          const displayName = imageTitle.trim() || file.name;
          const ok = await uploadSingleImageAsset(file, displayName);
          if (ok) successCount += 1;
          else failCount += 1;
        }

        if (successCount > 0) {
          if (imageInputRef.current) imageInputRef.current.value = '';
          setImageTitle('');
          setPendingImageFiles([]);
        }

        if (successCount > 0 && failCount === 0) {
          toast.success(successCount === 1 ? 'Image uploaded' : `${successCount} images uploaded`);
        } else if (successCount > 0 && failCount > 0) {
          toast.warning(`${successCount} uploaded, ${failCount} failed`);
        }
      } finally {
        setIsUploadingImage(false);
      }
    },
    [imageTitle, uploadSingleImageAsset]
  );

  const stageImageFiles = useCallback(async (files: File[]) => {
    const validFiles: File[] = [];
    for (const file of files) {
      const imageError = await validateImageFile(file);
      if (imageError) {
        toast.error(`${file.name}: ${imageError}`);
        continue;
      }
      validFiles.push(file);
    }
    if (validFiles.length === 0) return;

    setPendingImageFiles((prev) => {
      const next = [...prev];
      for (const file of validFiles) {
        const duplicate = next.some(
          (existing) =>
            existing.name === file.name &&
            existing.size === file.size &&
            existing.lastModified === file.lastModified
        );
        if (!duplicate) next.push(file);
      }
      return next;
    });

    toast.success(
      validFiles.length === 1
        ? 'Image attached. Click Upload to send.'
        : `${validFiles.length} images attached. Click Upload to send.`
    );
  }, []);

  const handleImageFileChange = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(event.target.files ?? []);
    if (files.length === 0) return;
    setUploadTab('image');
    await stageImageFiles(files);
    if (imageInputRef.current) imageInputRef.current.value = '';
  };

  const handleImagePaste = async (event: React.ClipboardEvent<HTMLDivElement>) => {
    if (uploadTab !== 'image' || !canUploadAssets || isCreatingAsset) return;
    const pastedImages = extractPastedImageFiles(event.clipboardData);
    if (pastedImages.length === 0) return;
    event.preventDefault();
    await stageImageFiles(pastedImages);
  };

  const handleCreateYoutubeAsset = async () => {
    if (!youtubeUrl.trim()) return;
    const created = await createAsset({
      provider: 'YOUTUBE',
      sourceUrl: youtubeUrl.trim(),
      displayName: youtubeTitle.trim() || undefined,
    });
    if (created) {
      setYoutubeUrl('');
      setYoutubeTitle('');
    }
  };

  const handleBunnyFileUpload = useCallback(
    async (file: File, options?: { index?: number; total?: number }) => {
      if (!file.type.startsWith('video/')) {
        toast.error(`${file.name}: Please select a video file`);
        return false;
      }

      let uploadedVideoId: string | null = null;
      let uploadToken: string | null = null;
      try {
        setIsUploadingBunny(true);
        setBunnyProgress(0);
        if (options?.total && options.total > 1) {
          setBunnyUploadLabel(`Uploading ${options.index ?? 1} of ${options.total}: ${file.name}`);
        } else {
          setBunnyUploadLabel('');
        }

        const initRes = await fetch(`/api/videos/${videoId}/assets/bunny-init`, {
          method: 'POST',
          headers: { 'Content-Type': 'application/json' },
          body: JSON.stringify({
            title: bunnyTitle.trim() || file.name.replace(/\.[^/.]+$/, ''),
            sizeBytes: file.size.toString(),
          }),
        });
        const initPayload = (await initRes.json().catch(() => null)) as {
          data?: {
            videoId: string;
            libraryId: string;
            signature: string;
            expirationTime: number;
            uploadToken: string;
          };
          error?: string;
          code?: string;
        } | null;

        if (!initRes.ok || !initPayload?.data) {
          toastApiError(initPayload, 'Failed to initialize Bunny upload', { prefix: file.name });
          return false;
        }

        const initData = initPayload.data;
        uploadedVideoId = initData.videoId;
        uploadToken = initData.uploadToken;

        await new Promise<void>((resolve, reject) => {
          const upload = new tus.Upload(file, {
            endpoint: 'https://video.bunnycdn.com/tusupload',
            retryDelays: [0, 3000, 5000, 10000, 20000],
            headers: {
              AuthorizationSignature: initData.signature,
              AuthorizationExpire: initData.expirationTime.toString(),
              VideoId: initData.videoId,
              LibraryId: initData.libraryId,
            },
            metadata: {
              filetype: file.type,
              title: file.name,
            },
            onError: (error) => reject(error),
            onProgress: (bytesUploaded, bytesTotal) => {
              const percentage = bytesTotal > 0 ? (bytesUploaded / bytesTotal) * 100 : 0;
              setBunnyProgress(Math.min(100, Math.max(0, percentage)));
            },
            onSuccess: () => resolve(),
          });
          upload.start();
        });

        const sourceUrl = `https://iframe.mediadelivery.net/embed/${initData.libraryId}/${initData.videoId}`;
        const thumbnailUrl = bunnyCdnHostname
          ? `https://${bunnyCdnHostname}/${initData.videoId}/thumbnail.jpg`
          : undefined;
        const createdAsset = await createAsset({
          provider: 'BUNNY',
          sourceUrl,
          providerVideoId: initData.videoId,
          uploadToken: initData.uploadToken,
          thumbnailUrl,
          displayName: bunnyTitle.trim() || file.name,
        });
        if (!createdAsset) {
          throw new Error('Failed to finalize Bunny asset');
        }
        setBunnyReadyByAssetId((prev) => ({ ...prev, [createdAsset.id]: false }));
        setBunnyProcessingByAssetId((prev) => ({ ...prev, [createdAsset.id]: true }));
        return true;
      } catch (error) {
        console.error('Failed to upload Bunny asset:', error);
        toastApiError(error, 'Failed to upload Bunny video', { prefix: file.name });
        if (uploadedVideoId && uploadToken) {
          await fetch(`/api/videos/${videoId}/assets/bunny-init`, {
            method: 'DELETE',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ videoId: uploadedVideoId, uploadToken }),
          }).catch(() => undefined);
        }
        return false;
      } finally {
        setIsUploadingBunny(false);
        setBunnyProgress(0);
        setBunnyUploadLabel('');
      }
    },
    [videoId, bunnyTitle, bunnyCdnHostname, createAsset]
  );

  const handleR2FileUpload = useCallback(
    async (file: File, options?: { index?: number; total?: number }) => {
      if (!file.type.startsWith('video/')) {
        toast.error(`${file.name}: Please select a video file`);
        return false;
      }

      try {
        setIsUploadingBunny(true);
        setBunnyProgress(0);
        if (options?.total && options.total > 1) {
          setBunnyUploadLabel(`Uploading ${options.index ?? 1} of ${options.total}: ${file.name}`);
        } else {
          setBunnyUploadLabel('');
        }

        const uploadResult = await uploadAssetVideoToR2(videoId, file, {
          onProgress: (progress) => setBunnyProgress(progress),
        });

        const createdAsset = await createAsset({
          provider: 'R2_VIDEO',
          sourceUrl: uploadResult.proxyUrl,
          objectKey: uploadResult.objectKey,
          uploadToken: uploadResult.uploadToken,
          reservationId: uploadResult.reservationId,
          thumbnailUrl: uploadResult.thumbnailUrl ?? undefined,
          displayName: bunnyTitle.trim() || file.name,
        });
        if (!createdAsset) {
          throw new Error('Failed to finalize video asset');
        }
        return true;
      } catch (error) {
        console.error('Failed to upload R2 asset video:', error);
        toastApiError(error, 'Failed to upload video', { prefix: file.name });
        return false;
      } finally {
        setIsUploadingBunny(false);
        setBunnyProgress(0);
        setBunnyUploadLabel('');
      }
    },
    [videoId, bunnyTitle, createAsset]
  );

  const handleVideoFileUpload = useCallback(
    (file: File, options?: { index?: number; total?: number }) => {
      if (directUploadProvider === 'r2') {
        return handleR2FileUpload(file, options);
      }
      return handleBunnyFileUpload(file, options);
    },
    [directUploadProvider, handleBunnyFileUpload, handleR2FileUpload]
  );

  const handleVideoBatchUpload = useCallback(
    async (files: File[]) => {
      if (files.length === 0) return;

      let successCount = 0;
      let failCount = 0;

      for (let index = 0; index < files.length; index++) {
        const ok = await handleVideoFileUpload(files[index], {
          index: index + 1,
          total: files.length,
        });
        if (ok) successCount += 1;
        else failCount += 1;
      }

      if (bunnyInputRef.current) bunnyInputRef.current.value = '';
      if (successCount > 0) setBunnyTitle('');

      if (successCount > 0 && failCount === 0) {
        toast.success(successCount === 1 ? 'Video uploaded' : `${successCount} videos uploaded`);
      } else if (successCount > 0 && failCount > 0) {
        toast.warning(`${successCount} uploaded, ${failCount} failed`);
      }
    },
    [handleVideoFileUpload]
  );

  const handleBunnyUpload = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(event.target.files ?? []).filter((file) =>
      file.type.startsWith('video/')
    );
    if (files.length === 0) {
      toast.error('Please select valid video files');
      return;
    }
    await handleVideoBatchUpload(files);
  };

  const handleBunnyThumbnailError = (assetId: string) => {
    const alreadyReady = !!bunnyReadyByAssetId[assetId];
    setBunnyThumbnailLoadErrorByAssetId((prev) => ({ ...prev, [assetId]: true }));
    if (!alreadyReady) {
      setBunnyProcessingByAssetId((prev) => (prev[assetId] ? prev : { ...prev, [assetId]: true }));
      setBunnyReadyByAssetId((prev) => ({ ...prev, [assetId]: false }));
    }
    window.setTimeout(() => {
      setBunnyThumbnailRetryKeyByAssetId((prev) => ({ ...prev, [assetId]: Date.now() }));
      setBunnyThumbnailLoadErrorByAssetId((prev) => ({ ...prev, [assetId]: false }));
    }, 10000);
  };

  const handleBunnyThumbnailLoad = (assetId: string) => {
    setBunnyThumbnailLoadErrorByAssetId((prev) => {
      if (!prev[assetId]) return prev;
      return { ...prev, [assetId]: false };
    });
  };

  const startRecording = useCallback(async () => {
    try {
      const stream = await navigator.mediaDevices.getUserMedia({ audio: true });
      const mimeType = MediaRecorder.isTypeSupported('audio/webm;codecs=opus')
        ? 'audio/webm;codecs=opus'
        : 'audio/webm';
      const recorder = new MediaRecorder(stream, { mimeType });
      audioChunksRef.current = [];
      recorder.ondataavailable = (e) => {
        if (e.data.size > 0) audioChunksRef.current.push(e.data);
      };
      recorder.onstop = async () => {
        const elapsedMs = Date.now() - recordingStartedAtRef.current;
        const raw = new Blob(audioChunksRef.current, { type: mimeType });
        // MediaRecorder leaves the WebM duration unset, so stamp it in before the
        // blob reaches a player or the upload.
        const blob = await withWebmDuration(raw, elapsedMs);
        setRecordingTime(elapsedMs / 1000);
        setAudioBlob(blob);
        setAudioBlobUrl((prev) => {
          if (prev) URL.revokeObjectURL(prev);
          return URL.createObjectURL(blob);
        });
        stream.getTracks().forEach((t) => t.stop());
      };
      mediaRecorderRef.current = recorder;
      recorder.start(100);
      setIsRecording(true);
      setRecordingTime(0);
      // Background tabs throttle timers, so read the clock instead of counting ticks.
      recordingStartedAtRef.current = Date.now();
      recordingTimerRef.current = setInterval(
        () => setRecordingTime((Date.now() - recordingStartedAtRef.current) / 1000),
        250
      );
    } catch {
      toast.error('Could not access microphone');
    }
  }, []);

  const stopRecording = useCallback(() => {
    mediaRecorderRef.current?.stop();
    mediaRecorderRef.current = null;
    setIsRecording(false);
    if (recordingTimerRef.current) {
      clearInterval(recordingTimerRef.current);
      recordingTimerRef.current = null;
    }
  }, []);

  const cancelRecording = useCallback(() => {
    mediaRecorderRef.current?.stop();
    mediaRecorderRef.current?.stream?.getTracks().forEach((t) => t.stop());
    mediaRecorderRef.current = null;
    setIsRecording(false);
    setRecordingTime(0);
    setAudioBlob(null);
    setAudioBlobUrl((prev) => {
      if (prev) URL.revokeObjectURL(prev);
      return null;
    });
    setPendingAudioFiles([]);
    if (recordingTimerRef.current) {
      clearInterval(recordingTimerRef.current);
      recordingTimerRef.current = null;
    }
  }, []);

  const uploadSingleAudioAsset = useCallback(
    async (file: File | Blob, fileName: string, displayName?: string): Promise<boolean> => {
      const validationError = getAudioUploadValidationError(file);
      if (validationError) {
        toast.error(`${fileName}: ${validationError}`);
        return false;
      }

      try {
        const formData = new FormData();
        formData.append('audio', file, file instanceof File ? file.name : 'recording.webm');
        formData.append('videoId', videoId);
        const guestUploadToken = await getGuestUploadToken('audio');
        if (guestUploadToken) formData.append('uploadToken', guestUploadToken);

        const uploadRes = await fetch('/api/upload/audio', {
          method: 'POST',
          body: formData,
        });
        const uploadPayload = await readUploadAudioResponse(uploadRes);
        const uploadedUrl = uploadPayload?.data?.url;
        if (!uploadRes.ok || !uploadedUrl) {
          toastApiError(
            uploadPayload,
            uploadRes.status === 413
              ? MAX_AUDIO_UPLOAD_SIZE_MESSAGE
              : 'Failed to upload voice recording',
            { prefix: fileName }
          );
          return false;
        }

        const created = await createAsset({
          provider: 'R2_AUDIO',
          sourceUrl: uploadedUrl,
          displayName:
            displayName?.trim() || fileName.replace(/\.[^/.]+$/, '') || 'Voice Recording',
          reservationId: uploadPayload?.data?.reservationId ?? null,
        });
        return !!created;
      } catch (error) {
        console.error('Failed to upload voice asset:', error);
        toastApiError(error, 'Failed to upload voice recording', { prefix: fileName });
        return false;
      }
    },
    [videoId, getGuestUploadToken, createAsset]
  );

  const stageAudioFiles = useCallback((files: File[]) => {
    const validFiles: File[] = [];
    for (const file of files) {
      const audioError = getAudioUploadValidationError(file);
      if (audioError) {
        toast.error(`${file.name}: ${audioError}`);
        continue;
      }
      validFiles.push(file);
    }
    if (validFiles.length === 0) return;

    setPendingAudioFiles((prev) => {
      const next = [...prev];
      for (const file of validFiles) {
        const duplicate = next.some(
          (existing) =>
            existing.name === file.name &&
            existing.size === file.size &&
            existing.lastModified === file.lastModified
        );
        if (!duplicate) next.push(file);
      }
      return next;
    });

    toast.success(
      validFiles.length === 1
        ? 'Audio file attached. Click Upload to send.'
        : `${validFiles.length} audio files attached. Click Upload to send.`
    );
  }, []);

  const handleVoiceFileChange = (event: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(event.target.files ?? []);
    if (files.length === 0) return;
    setUploadTab('voice');
    stageAudioFiles(files);
    if (voiceInputRef.current) voiceInputRef.current.value = '';
  };

  const handleVoiceUpload = useCallback(async () => {
    if (audioBlob && pendingAudioFiles.length === 0) {
      setIsUploadingVoice(true);
      try {
        const ok = await uploadSingleAudioAsset(
          audioBlob,
          'recording.webm',
          voiceTitle.trim() || 'Voice Recording'
        );
        if (ok) {
          setVoiceTitle('');
          setAudioBlob(null);
          setAudioBlobUrl((prev) => {
            if (prev) URL.revokeObjectURL(prev);
            return null;
          });
        }
      } finally {
        setIsUploadingVoice(false);
      }
      return;
    }

    if (pendingAudioFiles.length === 0) return;

    setIsUploadingVoice(true);
    let successCount = 0;
    let failCount = 0;

    try {
      for (const file of pendingAudioFiles) {
        const displayName = voiceTitle.trim() || file.name.replace(/\.[^/.]+$/, '');
        const ok = await uploadSingleAudioAsset(file, file.name, displayName);
        if (ok) successCount += 1;
        else failCount += 1;
      }

      if (successCount > 0) {
        setVoiceTitle('');
        setPendingAudioFiles([]);
        if (voiceInputRef.current) voiceInputRef.current.value = '';
      }

      if (successCount > 0 && failCount === 0) {
        toast.success(
          successCount === 1 ? 'Audio uploaded' : `${successCount} audio files uploaded`
        );
      } else if (successCount > 0 && failCount > 0) {
        toast.warning(`${successCount} uploaded, ${failCount} failed`);
      }
    } finally {
      setIsUploadingVoice(false);
    }
  }, [audioBlob, pendingAudioFiles, uploadSingleAudioAsset, voiceTitle]);

  const handleDragEnter = useCallback(
    (e: React.DragEvent) => {
      e.preventDefault();
      if (!canUploadAssets) return;
      dragCounterRef.current += 1;
      if (e.dataTransfer.types.includes('Files')) setIsDragOver(true);
    },
    [canUploadAssets]
  );

  const handleDragLeave = useCallback((e: React.DragEvent) => {
    e.preventDefault();
    dragCounterRef.current -= 1;
    if (dragCounterRef.current === 0) setIsDragOver(false);
  }, []);

  const handleDragOver = useCallback((e: React.DragEvent) => {
    e.preventDefault();
  }, []);

  const handleDrop = useCallback(
    async (e: React.DragEvent) => {
      e.preventDefault();
      dragCounterRef.current = 0;
      setIsDragOver(false);
      if (!canUploadAssets) return;

      const files = Array.from(e.dataTransfer.files);
      if (files.length === 0) return;

      const imageFiles: File[] = [];
      const videoFiles: File[] = [];
      const audioFiles: File[] = [];
      let unsupportedCount = 0;

      for (const file of files) {
        if (file.type.startsWith('image/')) {
          imageFiles.push(file);
        } else if (file.type.startsWith('video/')) {
          videoFiles.push(file);
        } else if (file.type.startsWith('audio/')) {
          audioFiles.push(file);
        } else {
          unsupportedCount += 1;
          toast.error(`${file.name}: Unsupported file type`);
        }
      }

      if (imageFiles.length > 0) {
        setUploadTab('image');
        await stageImageFiles(imageFiles);
      }

      if (audioFiles.length > 0) {
        setUploadTab('voice');
        stageAudioFiles(audioFiles);
      }

      if (videoFiles.length > 0) {
        setUploadTab('bunny');
        await handleVideoBatchUpload(videoFiles);
      }

      if (
        imageFiles.length === 0 &&
        videoFiles.length === 0 &&
        audioFiles.length === 0 &&
        unsupportedCount === 0
      ) {
        toast.error('Drop an image, video, or audio file.');
      }
    },
    [canUploadAssets, handleVideoBatchUpload, stageAudioFiles, stageImageFiles]
  );

  const renderAssetPreview = (asset: VideoAsset) => {
    if (asset.kind === 'AUDIO') {
      return (
        <div className="h-24 w-36 rounded border bg-muted flex flex-col items-center justify-center gap-1">
          <Volume2 className="h-6 w-6 text-muted-foreground" />
          <span className="text-[10px] text-muted-foreground font-medium">Voice Recording</span>
        </div>
      );
    }

    if (asset.kind === 'IMAGE') {
      const imageSrc = asset.thumbnailUrl || asset.sourceUrl;
      return (
        <div className="h-24 w-36 rounded border bg-black/20 flex items-center justify-center overflow-hidden">
          {imageSrc ? (
            // eslint-disable-next-line @next/next/no-img-element
            <img src={imageSrc} alt={asset.displayName} className="h-full w-full object-contain" />
          ) : (
            <ImageIcon className="h-6 w-6 text-muted-foreground" />
          )}
        </div>
      );
    }

    if (asset.provider === 'YOUTUBE' && asset.providerVideoId) {
      return (
        <div className="h-24 w-36 rounded border overflow-hidden bg-black/70 flex items-center justify-center">
          {/* eslint-disable-next-line @next/next/no-img-element */}
          <img
            src={
              asset.thumbnailUrl ||
              `https://img.youtube.com/vi/${asset.providerVideoId}/mqdefault.jpg`
            }
            alt={asset.displayName}
            className="h-full w-full object-contain"
          />
        </div>
      );
    }

    if (asset.provider === 'R2_VIDEO') {
      const thumbnailSrc = asset.thumbnailUrl;
      return (
        <div className="h-24 w-36 rounded border overflow-hidden bg-black/70 relative flex items-center justify-center">
          {thumbnailSrc ? (
            // eslint-disable-next-line @next/next/no-img-element
            <img
              src={thumbnailSrc}
              alt={asset.displayName}
              className="h-full w-full object-cover"
            />
          ) : (
            <FileVideo className="h-6 w-6 text-muted-foreground" />
          )}
          <div className="absolute inset-0 bg-black/30 flex items-center justify-center">
            <Play className="h-4 w-4 text-white" />
          </div>
        </div>
      );
    }

    const retryKey = bunnyThumbnailRetryKeyByAssetId[asset.id] || 0;
    const isProcessing = !!bunnyProcessingByAssetId[asset.id];
    const isReadyToPlay = !!bunnyReadyByAssetId[asset.id];
    const hasThumbnailLoadError = !!bunnyThumbnailLoadErrorByAssetId[asset.id];
    const thumbnailSrc = asset.thumbnailUrl
      ? `${asset.thumbnailUrl}${retryKey ? `?t=${retryKey}` : ''}`
      : null;
    const showThumbnailImage = !!thumbnailSrc && !hasThumbnailLoadError;

    return (
      <div className="h-24 w-36 rounded border overflow-hidden bg-muted relative flex items-center justify-center">
        {showThumbnailImage ? (
          // eslint-disable-next-line @next/next/no-img-element
          <img
            src={thumbnailSrc}
            alt=""
            className="h-full w-full object-cover"
            onLoad={() => handleBunnyThumbnailLoad(asset.id)}
            onError={() => handleBunnyThumbnailError(asset.id)}
          />
        ) : isReadyToPlay ? (
          <div className="h-full w-full bg-black/60 flex flex-col items-center justify-center gap-1">
            <Play className="h-4 w-4 text-emerald-300" />
            <span className="text-[10px] text-emerald-100 font-medium">Ready to play</span>
          </div>
        ) : (
          <FileVideo className="h-6 w-6 text-muted-foreground" />
        )}
        {isProcessing && !isReadyToPlay && (
          <div className="absolute inset-0 bg-black/65 flex flex-col items-center justify-center gap-1">
            <Loader2 className="h-4 w-4 animate-spin text-white" />
            <span className="text-[10px] text-white/90 font-medium">Processing...</span>
          </div>
        )}
      </div>
    );
  };

  const handleOpenAsset = (asset: VideoAsset) => {
    if (asset.kind === 'IMAGE') {
      if (!asset.sourceUrl) {
        toast.error('Preview is unavailable for this asset');
        return;
      }
      setPreviewImage(asset.sourceUrl);
      setPreviewImageTitle(asset.displayName);
      return;
    }
    if (asset.kind === 'AUDIO') {
      setSelectedAsset(asset);
      return;
    }
    if (asset.provider === 'BUNNY' && !bunnyReadyByAssetId[asset.id]) {
      setBunnyProcessingByAssetId((prev) =>
        prev[asset.id] ? prev : { ...prev, [asset.id]: true }
      );
    }
    setSelectedAsset(asset);
  };

  const selectedBunnyAssetId = selectedAsset?.provider === 'BUNNY' ? selectedAsset.id : null;
  const isSelectedBunnyProcessing = selectedBunnyAssetId
    ? !!bunnyProcessingByAssetId[selectedBunnyAssetId] && !bunnyReadyByAssetId[selectedBunnyAssetId]
    : false;

  return (
    <div
      className="space-y-4"
      onPaste={handleImagePaste}
      onDragEnter={handleDragEnter}
      onDragLeave={handleDragLeave}
      onDragOver={handleDragOver}
      onDrop={handleDrop}
    >
      <div className="flex items-center justify-between">
        <div className="flex items-center gap-2">
          <span className="font-medium">Assets</span>
          <Badge variant="secondary">{assets.length}</Badge>
        </div>
      </div>

      {canUploadAssets ? (
        <div
          className={cn(
            'rounded-lg border p-3 space-y-3 relative transition-colors',
            isDragOver && 'border-primary bg-primary/5'
          )}
        >
          {isDragOver && (
            <div className="absolute inset-0 z-10 flex flex-col items-center justify-center gap-2 rounded-lg bg-primary/10 border-2 border-dashed border-primary pointer-events-none">
              <UploadCloud className="h-8 w-8 text-primary" />
              <span className="text-sm font-medium text-primary">Drop files to upload</span>
              <span className="text-xs text-primary/80">
                Multiple images, videos, or audio supported
              </span>
            </div>
          )}
          <Tabs
            value={uploadTab}
            onValueChange={(value) =>
              setUploadTab(value as 'image' | 'youtube' | 'bunny' | 'voice')
            }
          >
            <TabsList className="grid w-full grid-cols-4">
              <TabsTrigger value="image">Image</TabsTrigger>
              <TabsTrigger value="youtube">YouTube</TabsTrigger>
              <TabsTrigger value="bunny">Video</TabsTrigger>
              <TabsTrigger value="voice">Voice</TabsTrigger>
            </TabsList>
          </Tabs>

          {uploadTab === 'image' && (
            <div className="space-y-2">
              <Input
                placeholder="Optional name for mentions/tagging"
                value={imageTitle}
                onChange={(event) => setImageTitle(event.target.value)}
              />
              <p className="text-xs text-muted-foreground">
                If set, this name will be used in @asset mentions.
              </p>
              <p className="text-xs text-muted-foreground">
                Tip: paste an image with Ctrl/Cmd+V, or drop multiple files onto this panel.
              </p>
              {pendingImageFiles.length > 0 ? (
                <div className="space-y-1">
                  {pendingImageFiles.map((file, index) => (
                    <div
                      key={`${file.name}-${file.size}-${file.lastModified}-${index}`}
                      className="rounded-md border px-2 py-1.5 text-xs flex items-center justify-between gap-2"
                    >
                      <span className="truncate">Attached: {file.name}</span>
                      <Button
                        type="button"
                        size="sm"
                        variant="ghost"
                        className="h-6 px-2"
                        onClick={() => {
                          setPendingImageFiles((prev) => prev.filter((_, i) => i !== index));
                        }}
                      >
                        Remove
                      </Button>
                    </div>
                  ))}
                  <Button
                    type="button"
                    size="sm"
                    variant="ghost"
                    className="h-6 px-2 text-xs"
                    onClick={() => {
                      setPendingImageFiles([]);
                      if (imageInputRef.current) imageInputRef.current.value = '';
                    }}
                  >
                    Clear all
                  </Button>
                </div>
              ) : null}
              <Button
                variant="outline"
                className="w-full"
                disabled={isUploadingImage || isCreatingAsset}
                onClick={() => {
                  if (pendingImageFiles.length > 0) {
                    void handleImageUpload(pendingImageFiles);
                    return;
                  }
                  imageInputRef.current?.click();
                }}
              >
                {isUploadingImage || isCreatingAsset ? (
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                ) : (
                  <UploadCloud className="h-4 w-4 mr-2" />
                )}
                {isUploadingImage
                  ? 'Uploading...'
                  : isCreatingAsset
                    ? 'Saving...'
                    : pendingImageFiles.length > 1
                      ? `Upload ${pendingImageFiles.length} Images`
                      : pendingImageFiles.length === 1
                        ? 'Upload Image'
                        : 'Select Images'}
              </Button>
              <input
                ref={imageInputRef}
                type="file"
                accept="image/*"
                multiple
                className="hidden"
                onChange={handleImageFileChange}
              />
            </div>
          )}

          {uploadTab === 'youtube' && (
            <div className="space-y-2">
              <Input
                placeholder="https://youtube.com/watch?v=..."
                value={youtubeUrl}
                onChange={(event) => setYoutubeUrl(event.target.value)}
              />
              <Input
                placeholder="Optional display name"
                value={youtubeTitle}
                onChange={(event) => setYoutubeTitle(event.target.value)}
              />
              <Button
                className="w-full"
                disabled={isCreatingAsset || !youtubeUrl.trim()}
                onClick={handleCreateYoutubeAsset}
              >
                <Youtube className="h-4 w-4 mr-2" />
                Add YouTube Asset
              </Button>
            </div>
          )}

          {uploadTab === 'bunny' && (
            <div className="space-y-2">
              <Input
                placeholder="Optional name for mentions/tagging"
                value={bunnyTitle}
                onChange={(event) => setBunnyTitle(event.target.value)}
              />
              <p className="text-xs text-muted-foreground">
                If set, this name will be used in @asset mentions.
              </p>
              <p className="text-xs text-muted-foreground">
                Drop multiple video files onto this panel to upload them in sequence.
              </p>
              <Button
                variant="outline"
                className="w-full"
                disabled={isUploadingBunny || isCreatingAsset}
                onClick={() => bunnyInputRef.current?.click()}
              >
                {isUploadingBunny ? (
                  <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                ) : (
                  <UploadCloud className="h-4 w-4 mr-2" />
                )}
                {isUploadingBunny ? 'Uploading...' : 'Select Videos'}
              </Button>
              <input
                ref={bunnyInputRef}
                type="file"
                accept="video/*"
                multiple
                className="hidden"
                onChange={handleBunnyUpload}
              />
              {isUploadingBunny && (
                <div className="space-y-1">
                  {bunnyUploadLabel ? (
                    <p className="text-xs text-muted-foreground">{bunnyUploadLabel}</p>
                  ) : null}
                  <div className="w-full bg-secondary rounded-full h-2 overflow-hidden">
                    <div
                      className="bg-primary h-2 rounded-full"
                      style={{ width: `${bunnyProgress}%` }}
                    />
                  </div>
                </div>
              )}
            </div>
          )}

          {uploadTab === 'voice' && (
            <div className="space-y-2">
              <Input
                placeholder="Optional name for this recording"
                value={voiceTitle}
                onChange={(e) => setVoiceTitle(e.target.value)}
                disabled={isRecording || isUploadingVoice}
              />
              {pendingAudioFiles.length > 0 ? (
                <div className="space-y-2">
                  {pendingAudioFiles.map((file, index) => (
                    <div
                      key={`${file.name}-${file.size}-${file.lastModified}-${index}`}
                      className="rounded-md border px-2 py-1.5 text-xs flex items-center justify-between gap-2"
                    >
                      <span className="truncate">Attached: {file.name}</span>
                      <Button
                        type="button"
                        size="sm"
                        variant="ghost"
                        className="h-6 px-2"
                        onClick={() => {
                          setPendingAudioFiles((prev) => prev.filter((_, i) => i !== index));
                        }}
                      >
                        Remove
                      </Button>
                    </div>
                  ))}
                  <Button
                    type="button"
                    size="sm"
                    variant="ghost"
                    className="h-6 px-2 text-xs"
                    onClick={() => {
                      setPendingAudioFiles([]);
                      if (voiceInputRef.current) voiceInputRef.current.value = '';
                    }}
                  >
                    Clear all
                  </Button>
                  <Button
                    className="w-full"
                    disabled={isUploadingVoice || isCreatingAsset}
                    onClick={() => void handleVoiceUpload()}
                  >
                    {isUploadingVoice ? (
                      <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                    ) : (
                      <UploadCloud className="h-4 w-4 mr-2" />
                    )}
                    {isUploadingVoice
                      ? 'Uploading...'
                      : pendingAudioFiles.length > 1
                        ? `Upload ${pendingAudioFiles.length} Files`
                        : 'Upload File'}
                  </Button>
                </div>
              ) : isRecording ? (
                <div className="flex items-center gap-2">
                  <div className="flex-1 flex items-center gap-2 rounded-md border px-3 py-2 text-sm">
                    <span className="relative flex h-2 w-2">
                      <span className="animate-ping absolute inline-flex h-full w-full rounded-full bg-red-400 opacity-75" />
                      <span className="relative inline-flex rounded-full h-2 w-2 bg-red-500" />
                    </span>
                    <span className="text-red-500 font-medium">Recording</span>
                    <span className="ml-auto tabular-nums text-muted-foreground">
                      {String(Math.floor(recordingTime / 60)).padStart(2, '0')}:
                      {String(recordingTime % 60).padStart(2, '0')}
                    </span>
                  </div>
                  <Button
                    size="icon"
                    variant="outline"
                    className="h-9 w-9 shrink-0"
                    title="Stop recording"
                    onClick={stopRecording}
                  >
                    <Square className="h-3.5 w-3.5 fill-current" />
                  </Button>
                  <Button
                    size="icon"
                    variant="ghost"
                    className="h-9 w-9 shrink-0"
                    title="Cancel recording"
                    onClick={cancelRecording}
                  >
                    <X className="h-4 w-4" />
                  </Button>
                </div>
              ) : audioBlob ? (
                <div className="space-y-2">
                  <div className="flex items-center gap-2 p-2 bg-muted rounded">
                    <Button
                      size="icon"
                      variant="ghost"
                      className="h-8 w-8 shrink-0"
                      onClick={() =>
                        audioBlobUrl && playVoice('recording-preview', audioBlobUrl, recordingTime)
                      }
                    >
                      {playingVoiceId === 'recording-preview' ? (
                        <Pause className="h-4 w-4" />
                      ) : (
                        <Play className="h-4 w-4" />
                      )}
                    </Button>
                    <div className="flex-1 h-2 bg-primary/20 rounded-full overflow-hidden">
                      <div
                        className="h-full bg-primary rounded-full"
                        style={{
                          width:
                            playingVoiceId === 'recording-preview' ? `${voiceProgress}%` : '0%',
                        }}
                      />
                    </div>
                    <span className="text-xs text-muted-foreground tabular-nums shrink-0">
                      {playingVoiceId === 'recording-preview'
                        ? `${formatTime(voiceCurrentTime)} / ${formatTime(recordingTime)}`
                        : formatTime(recordingTime)}
                    </span>
                    {playingVoiceId === 'recording-preview' && (
                      <button
                        onClick={toggleVoiceSpeed}
                        className="text-[10px] font-bold px-1 py-0.5 rounded bg-muted hover:bg-muted-foreground/20 tabular-nums shrink-0"
                      >
                        {voicePlaybackRate}x
                      </button>
                    )}
                  </div>
                  <div className="flex gap-2">
                    <Button
                      className="flex-1"
                      disabled={isUploadingVoice || isCreatingAsset}
                      onClick={handleVoiceUpload}
                    >
                      {isUploadingVoice ? (
                        <Loader2 className="h-4 w-4 mr-2 animate-spin" />
                      ) : (
                        <UploadCloud className="h-4 w-4 mr-2" />
                      )}
                      {isUploadingVoice ? 'Uploading...' : 'Upload Recording'}
                    </Button>
                    <Button
                      variant="outline"
                      size="icon"
                      className="h-9 w-9 shrink-0"
                      title="Discard and re-record"
                      onClick={cancelRecording}
                    >
                      <X className="h-4 w-4" />
                    </Button>
                  </div>
                </div>
              ) : (
                <div className="space-y-2">
                  <Button
                    variant="outline"
                    className="w-full"
                    onClick={startRecording}
                    disabled={isUploadingVoice || isCreatingAsset}
                  >
                    <Mic className="h-4 w-4 mr-2" />
                    Start Recording
                  </Button>
                  <Button
                    variant="outline"
                    className="w-full"
                    disabled={isUploadingVoice || isCreatingAsset}
                    onClick={() => voiceInputRef.current?.click()}
                  >
                    <UploadCloud className="h-4 w-4 mr-2" />
                    Select Audio Files
                  </Button>
                  <input
                    ref={voiceInputRef}
                    type="file"
                    accept="audio/*"
                    multiple
                    className="hidden"
                    onChange={handleVoiceFileChange}
                  />
                </div>
              )}
              <p className="text-xs text-muted-foreground">
                Or drag multiple audio files anywhere onto this panel.
              </p>
            </div>
          )}
        </div>
      ) : (
        <div className="rounded-lg border p-3 text-xs text-muted-foreground">
          You do not have permission to upload assets.
        </div>
      )}

      <AssetListSection
        assets={sortedAssets}
        isLoadingAssets={isLoadingAssets}
        focusedAssetId={focusedAssetId}
        bunnyProcessingByAssetId={bunnyProcessingByAssetId}
        bunnyReadyByAssetId={bunnyReadyByAssetId}
        activeDownloadAssetId={activeDownloadAssetId}
        deletingAssetIds={deletingAssetIds}
        canDownloadAssets={canDownloadAssets}
        hasMoreAssets={hasMoreAssets}
        isLoadingMoreAssets={isLoadingMoreAssets}
        onViewAsset={handleOpenAsset}
        onDownloadAsset={(asset, preference) => void downloadAsset(asset, preference)}
        onDeleteAsset={(assetId) => void deleteAsset(assetId)}
        onLoadMoreAssets={() => void loadMoreAssets()}
        renderAssetPreview={renderAssetPreview}
      />

      <ImagePreviewDialog
        previewImage={previewImage}
        title={previewImageTitle}
        downloadFileName={previewImageTitle}
        canDownload={canDownloadAssets}
        onClose={() => {
          setPreviewImage(null);
          setPreviewImageTitle(null);
        }}
      />

      <Dialog
        open={selectedAsset?.kind === 'AUDIO'}
        onOpenChange={(open) => {
          if (!open) {
            stopVoice();
            setSelectedAsset(null);
          }
        }}
      >
        <DialogContent className="max-w-sm">
          <DialogTitle>{selectedAsset?.displayName || 'Voice Recording'}</DialogTitle>
          {selectedAsset?.sourceUrl ? (
            <div className="flex items-center gap-2 p-2 bg-muted rounded">
              <Button
                size="icon"
                variant="ghost"
                className="h-8 w-8 shrink-0"
                onClick={() =>
                  selectedAsset.sourceUrl && playVoice(selectedAsset.id, selectedAsset.sourceUrl)
                }
              >
                {playingVoiceId === selectedAsset?.id ? (
                  <Pause className="h-4 w-4" />
                ) : (
                  <Play className="h-4 w-4" />
                )}
              </Button>
              <div className="flex-1 h-2 bg-primary/20 rounded-full overflow-hidden">
                <div
                  className="h-full bg-primary rounded-full"
                  style={{
                    width: playingVoiceId === selectedAsset?.id ? `${voiceProgress}%` : '0%',
                  }}
                />
              </div>
              <span className="text-xs text-muted-foreground tabular-nums shrink-0">
                {playingVoiceId === selectedAsset?.id ? formatTime(voiceCurrentTime) : '00:00'}
              </span>
              {playingVoiceId === selectedAsset?.id && (
                <button
                  onClick={toggleVoiceSpeed}
                  className="text-[10px] font-bold px-1 py-0.5 rounded bg-muted hover:bg-muted-foreground/20 tabular-nums shrink-0"
                >
                  {voicePlaybackRate}x
                </button>
              )}
            </div>
          ) : (
            <p className="text-sm text-muted-foreground">Audio preview unavailable.</p>
          )}
        </DialogContent>
      </Dialog>

      <Dialog
        open={selectedAsset?.kind === 'VIDEO'}
        onOpenChange={(open) => !open && setSelectedAsset(null)}
      >
        <DialogContent
          showCloseButton={false}
          className="max-w-none sm:max-w-none w-screen h-screen max-h-screen p-0 overflow-hidden bg-black/90 border-none shadow-none rounded-none flex items-center justify-center"
          onClick={() => setSelectedAsset(null)}
          onKeyDown={(event) => {
            event.stopPropagation();
            if (event.key === 'Escape') {
              event.preventDefault();
              setSelectedAsset(null);
            }
          }}
        >
          <DialogTitle className="sr-only">
            {selectedAsset?.displayName || 'Video Preview'}
          </DialogTitle>

          <div
            className="w-[min(96vw,1500px)] h-[min(94vh,1000px)] border border-border/60 bg-black/80 shadow-2xl flex flex-col overflow-hidden"
            onClick={(e) => e.stopPropagation()}
          >
            <div className="shrink-0 flex items-center gap-2 border-b border-border/60 bg-background/85 px-2 py-1.5 backdrop-blur-sm">
              <p
                className="flex-1 min-w-0 text-sm text-foreground truncate"
                title={selectedAsset?.displayName || undefined}
              >
                {selectedAsset?.displayName || 'Video Preview'}
              </p>
              {selectedAsset?.provider === 'YOUTUBE' && selectedAsset.providerVideoId ? (
                <Button asChild variant="outline" size="sm" className="h-8 shrink-0">
                  <a
                    href={`https://www.youtube.com/watch?v=${selectedAsset.providerVideoId}`}
                    target="_blank"
                    rel="noopener noreferrer"
                  >
                    Open on YouTube
                  </a>
                </Button>
              ) : selectedAsset?.provider === 'R2_VIDEO' && canDownloadAssets ? (
                <Button
                  variant="outline"
                  size="icon"
                  className="h-8 w-8 shrink-0"
                  title="Download video"
                  aria-label="Download video"
                  disabled={activeDownloadAssetId === selectedAsset.id}
                  onClick={() => void downloadAsset(selectedAsset)}
                >
                  {activeDownloadAssetId === selectedAsset.id ? (
                    <Loader2 className="h-4 w-4 animate-spin" />
                  ) : (
                    <Download className="h-4 w-4" />
                  )}
                </Button>
              ) : null}
              {selectedAsset?.provider === 'BUNNY' && canDownloadAssets ? (
                <DropdownMenu>
                  <DropdownMenuTrigger asChild>
                    <Button
                      variant="outline"
                      size="icon"
                      className="h-8 w-8 shrink-0"
                      title="Download Bunny video"
                      aria-label="Download Bunny video"
                      disabled={
                        activeDownloadAssetId === selectedAsset.id || isSelectedBunnyProcessing
                      }
                    >
                      {activeDownloadAssetId === selectedAsset.id ? (
                        <Loader2 className="h-4 w-4 animate-spin" />
                      ) : (
                        <Download className="h-4 w-4" />
                      )}
                    </Button>
                  </DropdownMenuTrigger>
                  <DropdownMenuContent align="end">
                    <DropdownMenuItem onClick={() => void downloadAsset(selectedAsset, 'original')}>
                      <Download className="h-3 w-3 mr-2" />
                      Original
                    </DropdownMenuItem>
                    <DropdownMenuItem
                      onClick={() => void downloadAsset(selectedAsset, 'compressed')}
                    >
                      <Download className="h-3 w-3 mr-2" />
                      Compressed
                    </DropdownMenuItem>
                  </DropdownMenuContent>
                </DropdownMenu>
              ) : null}
              <Button
                variant="outline"
                size="icon"
                className="h-8 w-8 shrink-0"
                onClick={() => setSelectedAsset(null)}
              >
                <span className="sr-only">Close</span>
                <X className="h-4 w-4" />
              </Button>
            </div>

            <div className="flex-1 min-h-0 w-full p-2 sm:p-4">
              {selectedAsset ? (
                selectedAsset.provider === 'YOUTUBE' && selectedAsset.providerVideoId ? (
                  <div className="w-full h-full rounded-md border overflow-hidden bg-black">
                    <iframe
                      ref={youtubeIframeRef}
                      className="w-full h-full"
                      src={`https://www.youtube.com/embed/${selectedAsset.providerVideoId}?enablejsapi=1&rel=0&modestbranding=1&playsinline=1${typeof window !== 'undefined' ? `&origin=${encodeURIComponent(window.location.origin)}` : ''}`}
                      title={selectedAsset.displayName}
                      allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share"
                      referrerPolicy="strict-origin-when-cross-origin"
                      allowFullScreen
                    />
                  </div>
                ) : selectedAsset.provider === 'R2_VIDEO' && selectedAsset.sourceUrl ? (
                  <video
                    className="w-full h-full rounded-md border bg-black object-contain"
                    src={selectedAsset.sourceUrl}
                    controls
                    playsInline
                    preload="metadata"
                  />
                ) : (
                  <BunnyPreviewPlayer
                    ref={bunnyPreviewPlayerRef}
                    providerVideoId={selectedAsset.providerVideoId}
                    isProcessing={isSelectedBunnyProcessing}
                    onReadyToPlay={() => {
                      if (!selectedBunnyAssetId) return;
                      setBunnyReadyByAssetId((prev) => ({ ...prev, [selectedBunnyAssetId]: true }));
                      setBunnyProcessingByAssetId((prev) => ({
                        ...prev,
                        [selectedBunnyAssetId]: false,
                      }));
                    }}
                  />
                )
              ) : null}
            </div>
          </div>
        </DialogContent>
      </Dialog>
    </div>
  );
});