File Upload

"use client";

import { useEffect, useRef, useState } from "react";
import {
  AttachmentUpload,
  type AttachmentUploadItem,
} from "@/components/motion/attachment-upload";

const INITIAL_ITEMS: AttachmentUploadItem[] = [
  {
    id: "brief",
    name: "launch-brief.pdf",
    kind: "file",
    size: 32_400_000,
    href: "data:application/pdf,beUI%20launch%20brief",
    status: "failed",
    error: "Upload failed",
  },
  {
    id: "flowers",
    name: "orange-flowers.jpg",
    kind: "image",
    size: 9_800_000,
    previewUrl:
      "https://images.unsplash.com/photo-1490750967868-88aa4486c946?auto=format&fit=crop&w=1200&q=85",
  },
  {
    id: "voice-note",
    name: "launch-note.m4a",
    kind: "audio",
    currentTime: 12,
    duration: 48,
  },
];

export function AttachmentUploadPreview() {
  const [items, setItems] = useState(INITIAL_ITEMS);
  const [playingId, setPlayingId] = useState<string>();
  const retryTimersRef = useRef<number[]>([]);

  useEffect(
    () => () => {
      for (const timer of retryTimersRef.current) {
        window.clearTimeout(timer);
      }
    },
    [],
  );

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

    const timer = window.setInterval(() => {
      setItems((current) =>
        current.map((item) => {
          if (item.id !== playingId || !item.duration) return item;
          const nextTime = Math.min(
            item.duration,
            (item.currentTime ?? 0) + 1,
          );
          return { ...item, currentTime: nextTime };
        }),
      );
    }, 1000);

    return () => window.clearInterval(timer);
  }, [playingId]);

  useEffect(() => {
    if (!playingId) return;
    const playingItem = items.find((item) => item.id === playingId);
    if (
      playingItem?.duration &&
      (playingItem.currentTime ?? 0) >= playingItem.duration
    ) {
      setPlayingId(undefined);
    }
  }, [items, playingId]);

  return (
    <div className="w-full max-w-2xl px-3 py-6 sm:px-6">
      <AttachmentUpload
        value={items}
        onValueChange={setItems}
        onRetry={(retryItem) => {
          setItems((current) =>
            current.map((item) =>
              item.id === retryItem.id
                ? { ...item, status: "uploading", error: undefined }
                : item,
            ),
          );

          const completeTimer = window.setTimeout(() => {
            setItems((current) =>
              current.map((item) =>
                item.id === retryItem.id
                  ? { ...item, status: "complete" }
                  : item,
              ),
            );
          }, 900);
          const readyTimer = window.setTimeout(() => {
            setItems((current) =>
              current.map((item) =>
                item.id === retryItem.id
                  ? { ...item, status: "idle" }
                  : item,
              ),
            );
          }, 1900);
          retryTimersRef.current.push(completeTimer, readyTimer);
        }}
        playingId={playingId}
        onAudioToggle={(item) => {
          setPlayingId((current) =>
            current === item.id ? undefined : item.id,
          );
        }}
        attachmentsLabel="Attachments:"
      />
    </div>
  );
}

"use client";
// beui.dev/components/blocks/file-upload

import {
  AlertCircle,
  Check,
  ExternalLink,
  FileImage,
  Link as LinkIcon,
  LoaderCircle,
  Mic,
  Paperclip,
  Pause,
  Play,
  RotateCcw,
  Upload,
  X,
} from "lucide-react";
import {
  AnimatePresence,
  LayoutGroup,
  motion,
  useReducedMotion,
} from "motion/react";
import {
  useCallback,
  useEffect,
  useId,
  useRef,
  useState,
} from "react";
import { createPortal } from "react-dom";
import { Tooltip } from "@/components/motion/tooltip";
import {
  EASE_OUT,
  SPRING_LAYOUT,
  SPRING_PRESS,
} from "@/lib/ease";
import { cn } from "@/lib/utils";

export type AttachmentUploadKind = "file" | "link" | "image" | "audio";
export type AttachmentRejectReason = "too-large" | "max-files";
export type AttachmentUploadStatus =
  | "idle"
  | "uploading"
  | "complete"
  | "failed";

export type AttachmentUploadItem = {
  id: string;
  name: string;
  kind: AttachmentUploadKind;
  size?: number;
  href?: string;
  previewUrl?: string;
  currentTime?: number;
  duration?: number;
  status?: AttachmentUploadStatus;
  error?: string;
  file?: File;
};

export type AttachmentUploadClassNames = {
  dropzone?: string;
  list?: string;
  row?: string;
};

export interface AttachmentUploadProps {
  value?: AttachmentUploadItem[];
  defaultValue?: AttachmentUploadItem[];
  onValueChange?: (items: AttachmentUploadItem[]) => void;
  onFilesAdded?: (items: AttachmentUploadItem[], files: File[]) => void;
  onFilesRejected?: (files: File[], reason: AttachmentRejectReason) => void;
  onRemove?: (item: AttachmentUploadItem) => void;
  onRetry?: (item: AttachmentUploadItem) => void;
  playingId?: string;
  onAudioToggle?: (item: AttachmentUploadItem) => void;
  accept?: string;
  multiple?: boolean;
  maxFiles?: number;
  maxFileSize?: number;
  disabled?: boolean;
  title?: string;
  description?: string;
  attachmentsLabel?: string;
  className?: string;
  classNames?: AttachmentUploadClassNames;
}

const ITEM_TRANSITION = { duration: 0.2, ease: EASE_OUT } as const;
const DEFAULT_MAX_FILE_SIZE = 500 * 1024 * 1024;
const UPLOAD_PROGRESS_MS = 900;
const UPLOAD_COMPLETE_HOLD_MS = 1000;
const REMOVE_PENDING_MS = 420;

const WAVEFORM_BARS = [
  18, 31, 24, 39, 30, 43, 27, 18, 9, 29, 38, 24, 34, 18, 26, 37, 21, 14,
  7, 11, 22, 35, 18, 26, 41, 29, 17, 33,
].map((height, index) => ({ id: `wave-${index}-${height}`, height }));

function useControllableList<T>({
  value,
  defaultValue,
  onValueChange,
}: {
  value?: T[];
  defaultValue?: T[];
  onValueChange?: (items: T[]) => void;
}) {
  const [internalValue, setInternalValue] = useState(defaultValue ?? []);
  const controlled = value !== undefined;
  const items = value ?? internalValue;

  const setItems = useCallback(
    (next: T[]) => {
      if (!controlled) setInternalValue(next);
      onValueChange?.(next);
    },
    [controlled, onValueChange],
  );

  return [items, setItems] as const;
}

function formatBytes(bytes: number | undefined) {
  if (bytes === undefined || !Number.isFinite(bytes) || bytes <= 0) {
    return null;
  }

  const units = ["B", "KB", "MB", "GB"];
  const exponent = Math.min(
    Math.floor(Math.log(bytes) / Math.log(1024)),
    units.length - 1,
  );
  const value = bytes / 1024 ** exponent;

  return `${value >= 10 || exponent === 0 ? value.toFixed(0) : value.toFixed(1)} ${units[exponent]}`;
}

function formatDuration(seconds: number | undefined) {
  const safeSeconds = Math.max(0, Math.round(seconds ?? 0));
  const minutes = Math.floor(safeSeconds / 60);
  return `${minutes}:${String(safeSeconds % 60).padStart(2, "0")}`;
}

function formatMaxSize(bytes: number) {
  const megabytes = bytes / (1024 * 1024);
  return `${Number.isInteger(megabytes) ? megabytes : megabytes.toFixed(1)} MB`;
}

function inferKind(file: File): AttachmentUploadKind {
  if (file.type.startsWith("image/")) return "image";
  if (file.type.startsWith("audio/")) return "audio";
  return "file";
}

function AttachmentIcon({ kind }: { kind: AttachmentUploadKind }) {
  if (kind === "link") return <LinkIcon className="size-4" />;
  if (kind === "image") return <FileImage className="size-4" />;
  if (kind === "audio") return <Mic className="size-4" />;
  return <Paperclip className="size-4" />;
}

function imageSource(item: AttachmentUploadItem) {
  if (item.kind !== "image") return undefined;
  return item.previewUrl ?? item.href;
}

type RowActionState =
  | "idle"
  | "uploading"
  | "complete"
  | "failed"
  | "removing";

function RowAction({
  label,
  onClick,
  state,
  retryable = false,
  reduce = false,
}: {
  label: string;
  onClick: () => void;
  state: RowActionState;
  retryable?: boolean;
  reduce?: boolean;
}) {
  if (state === "uploading") {
    return <span aria-hidden="true" className="size-9 shrink-0" />;
  }

  if (state === "complete") {
    return (
      <Tooltip content="Upload complete" side="top" delay={100}>
        <motion.span
          role="status"
          aria-label={`Upload complete for ${label}`}
          initial={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.75 }}
          animate={{ opacity: 1, scale: 1 }}
          transition={ITEM_TRANSITION}
          className="grid size-9 shrink-0 place-items-center rounded-xl text-emerald-600 dark:text-emerald-400"
        >
          <Check className="size-4" />
        </motion.span>
      </Tooltip>
    );
  }

  if (state === "removing") {
    return (
      <Tooltip content="Removing attachment" side="top" delay={100}>
        <span
          role="status"
          aria-label={`Removing ${label}`}
          className="grid size-9 shrink-0 place-items-center rounded-xl text-muted-foreground"
        >
          <motion.span
            animate={reduce ? undefined : { rotate: 360 }}
            transition={{
              duration: 0.7,
              ease: "linear",
              repeat: Infinity,
            }}
            className="grid place-items-center"
          >
            <LoaderCircle className="size-4" />
          </motion.span>
        </span>
      </Tooltip>
    );
  }

  if (state === "failed") {
    if (!retryable) {
      return (
        <Tooltip content="Upload failed" side="top" delay={100}>
          <span
            role="status"
            aria-label={`Upload failed for ${label}`}
            className="grid size-9 shrink-0 place-items-center rounded-xl text-destructive"
          >
            <AlertCircle className="size-4" />
          </span>
        </Tooltip>
      );
    }

    return (
      <Tooltip content="Retry upload" side="top" delay={100}>
        <motion.button
          type="button"
          aria-label={`Retry ${label}`}
          onClick={onClick}
          whileTap={reduce ? undefined : { scale: 0.92 }}
          transition={SPRING_PRESS}
          className="grid size-9 shrink-0 place-items-center rounded-xl text-destructive outline-none transition-colors hover:bg-destructive/10 focus-visible:ring-2 focus-visible:ring-ring"
        >
          <RotateCcw className="size-4" />
        </motion.button>
      </Tooltip>
    );
  }

  return (
    <Tooltip content="Remove attachment" side="top" delay={100}>
      <motion.button
        type="button"
        aria-label={`Remove ${label}`}
        onClick={onClick}
        whileTap={reduce ? undefined : { scale: 0.92 }}
        transition={SPRING_PRESS}
        className="grid size-9 shrink-0 place-items-center rounded-xl text-muted-foreground outline-none transition-colors hover:bg-muted hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
      >
        <X className="size-4" />
      </motion.button>
    </Tooltip>
  );
}

function ImageThumbnail({
  item,
  layoutId,
  onPreview,
  reduce,
}: {
  item: AttachmentUploadItem;
  layoutId?: string;
  onPreview: (item: AttachmentUploadItem) => void;
  reduce: boolean;
}) {
  const src = imageSource(item);

  if (!src) {
    return (
      <span
        aria-hidden="true"
        className="grid size-8 shrink-0 place-items-center rounded-lg bg-muted text-muted-foreground"
      >
        <FileImage className="size-4" />
      </span>
    );
  }

  return (
    <Tooltip
      side="top"
      delay={160}
      wrapperClassName="shrink-0"
      className="rounded-xl p-1 shadow-xl"
      content={
        <span className="block w-32">
          {/* biome-ignore lint/performance/noImgElement: Blob and remote previews keep this registry component framework-agnostic. */}
          <img
            src={src}
            alt=""
            className="h-20 w-full rounded-lg object-cover"
          />
          <span className="block px-1 pb-0.5 pt-1 text-center text-[10px] font-medium text-muted-foreground">
            Click to preview
          </span>
        </span>
      }
    >
      <motion.button
        type="button"
        aria-label={`Preview ${item.name}`}
        onClick={(event) => {
          event.currentTarget.blur();
          onPreview(item);
        }}
        whileTap={reduce ? undefined : { scale: 0.94 }}
        transition={SPRING_PRESS}
        className="group/image relative size-9 shrink-0 overflow-hidden rounded-[10px] bg-muted outline-none ring-1 ring-border/70 focus-visible:ring-2 focus-visible:ring-ring"
      >
        {/* biome-ignore lint/performance/noImgElement: Motion layout requires the image element and portable blob URLs. */}
        <motion.img
          layoutId={layoutId}
          src={src}
          alt=""
          className="size-full object-cover"
          transition={{ layout: SPRING_LAYOUT }}
        />
      </motion.button>
    </Tooltip>
  );
}

function ImagePreviewDialog({
  item,
  layoutId,
  onClose,
  reduce,
}: {
  item: AttachmentUploadItem | null;
  layoutId?: string;
  onClose: () => void;
  reduce: boolean;
}) {
  const closeRef = useRef<HTMLButtonElement>(null);

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

    const previousFocus =
      document.activeElement instanceof HTMLElement
        ? document.activeElement
        : null;
    const previousOverflow = document.body.style.overflow;
    document.body.style.overflow = "hidden";
    closeRef.current?.focus();

    const handleKeyDown = (event: KeyboardEvent) => {
      if (event.key === "Escape") onClose();
      if (event.key === "Tab") {
        event.preventDefault();
        closeRef.current?.focus();
      }
    };
    document.addEventListener("keydown", handleKeyDown);

    return () => {
      document.removeEventListener("keydown", handleKeyDown);
      document.body.style.overflow = previousOverflow;
      previousFocus?.focus();
    };
  }, [item, onClose]);

  if (typeof document === "undefined") return null;

  const src = item ? imageSource(item) : undefined;
  const content =
    item && src ? (
      <div className="pointer-events-none fixed inset-0 z-[10000]">
        <motion.button
          type="button"
          aria-label="Close image preview"
          tabIndex={-1}
          className="pointer-events-auto absolute inset-0 size-full cursor-default bg-black/45 backdrop-blur-xl"
          initial={{ opacity: 0 }}
          animate={{ opacity: 1 }}
          exit={reduce ? undefined : { opacity: 0 }}
          transition={{ duration: reduce ? 0.1 : 0.2, ease: EASE_OUT }}
          onClick={onClose}
        />

        <div className="absolute inset-0 flex items-center justify-center p-4 sm:p-8">
          <motion.div
            role="dialog"
            aria-modal="true"
            aria-label={`Preview of ${item.name}`}
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={reduce ? undefined : { opacity: 0 }}
            transition={ITEM_TRANSITION}
            className="pointer-events-auto relative"
          >
            {/* biome-ignore lint/performance/noImgElement: Motion layout requires the image element and portable blob URLs. */}
            <motion.img
              layoutId={reduce ? undefined : layoutId}
              src={src}
              alt={item.name}
              className="max-h-[90vh] max-w-[90vw] rounded-2xl object-contain shadow-2xl"
              transition={{ layout: SPRING_LAYOUT }}
            />
            <motion.button
              ref={closeRef}
              type="button"
              aria-label="Close image preview"
              onClick={onClose}
              initial={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.8 }}
              animate={{ opacity: 1, scale: 1 }}
              exit={
                reduce ? undefined : { opacity: 0, scale: 0.8 }
              }
              whileTap={reduce ? undefined : { scale: 0.92 }}
              transition={SPRING_PRESS}
              className="absolute -right-3 -top-3 grid size-9 place-items-center rounded-full bg-background text-foreground shadow-xl outline-none ring-1 ring-border/70 transition-colors hover:bg-muted focus-visible:ring-2 focus-visible:ring-ring"
            >
              <X className="size-4" />
            </motion.button>
          </motion.div>
        </div>
      </div>
    ) : null;

  return createPortal(
    reduce ? content : <AnimatePresence>{content}</AnimatePresence>,
    document.body,
  );
}

function AttachmentRow({
  item,
  playing,
  uploading,
  uploadComplete,
  failed,
  removing,
  arrivalIndex,
  imageLayoutId,
  onAudioToggle,
  onImagePreview,
  onRemove,
  onRetry,
  reduce,
  className,
}: {
  item: AttachmentUploadItem;
  playing: boolean;
  uploading: boolean;
  uploadComplete: boolean;
  failed: boolean;
  removing: boolean;
  arrivalIndex: number;
  imageLayoutId?: string;
  onAudioToggle?: (item: AttachmentUploadItem) => void;
  onImagePreview: (item: AttachmentUploadItem) => void;
  onRemove: (item: AttachmentUploadItem) => void;
  onRetry?: (item: AttachmentUploadItem) => void;
  reduce: boolean;
  className?: string;
}) {
  const size = formatBytes(item.size);
  const progress =
    item.duration && item.duration > 0
      ? Math.min(1, Math.max(0, (item.currentTime ?? 0) / item.duration))
      : 0;
  const actionState: RowActionState = removing
    ? "removing"
    : uploading
      ? "uploading"
      : uploadComplete
        ? "complete"
        : failed
          ? "failed"
          : "idle";
  const arrivalDelay = Math.min(Math.max(arrivalIndex, 0), 5) * 0.055;
  const rowTransition =
    !reduce && arrivalIndex >= 0
      ? {
          ...SPRING_LAYOUT,
          delay: arrivalDelay,
          opacity: {
            duration: 0.16,
            ease: EASE_OUT,
            delay: arrivalDelay,
          },
        }
      : ITEM_TRANSITION;
  const showUploadProgress = uploading || uploadComplete;
  const uploadProgress = (
    <motion.span
      role="progressbar"
      aria-label={`Uploading ${item.name}`}
      className="pointer-events-none absolute inset-0 -z-10 origin-left bg-emerald-400/25 dark:bg-emerald-500/20"
      initial={{ opacity: 1, scaleX: 0 }}
      animate={{ opacity: 1, scaleX: 1 }}
      exit={reduce ? undefined : { opacity: 0 }}
      transition={{
        duration: reduce ? 0.1 : UPLOAD_PROGRESS_MS / 1000,
        ease: EASE_OUT,
      }}
    />
  );

  return (
    <motion.li
      layout={!reduce}
      initial={
        reduce
          ? { opacity: 0 }
          : arrivalIndex >= 0
            ? { opacity: 0, y: -16, scale: 0.985 }
            : { opacity: 0, y: 6 }
      }
      animate={{ opacity: 1, y: 0, scale: 1 }}
      exit={reduce ? undefined : { opacity: 0, y: -4 }}
      transition={rowTransition}
      className={cn(
        "flex min-h-14 items-center gap-1 rounded-2xl bg-muted/70 p-1",
        className,
      )}
    >
      <div className="relative isolate flex min-w-0 flex-1 items-center gap-3 self-stretch overflow-hidden rounded-xl bg-background px-2 py-1">
        {failed ? (
          <span
            aria-hidden="true"
            className="pointer-events-none absolute inset-0 -z-10 bg-destructive/10"
          />
        ) : null}

        {item.kind === "image" ? (
          <ImageThumbnail
            item={item}
            layoutId={imageLayoutId}
            onPreview={onImagePreview}
            reduce={reduce}
          />
        ) : (
          <span
            aria-hidden="true"
            className="grid size-7 shrink-0 place-items-center text-muted-foreground"
          >
            <AttachmentIcon kind={item.kind} />
          </span>
        )}

        {item.kind === "audio" ? (
          <>
            <span className="w-9 shrink-0 text-xs tabular-nums text-muted-foreground">
              {formatDuration(item.currentTime)}
            </span>
            <span
              aria-hidden="true"
              className="flex h-11 min-w-0 flex-1 items-center gap-[3px] overflow-hidden"
            >
              {WAVEFORM_BARS.map((bar, index) => (
                <motion.span
                  key={bar.id}
                  className={cn(
                    "w-[3px] shrink-0 rounded-full",
                    index / WAVEFORM_BARS.length <= progress
                      ? "bg-foreground"
                      : "bg-muted-foreground/35",
                  )}
                  style={{ height: bar.height }}
                  animate={
                    reduce || !playing
                      ? undefined
                      : { scaleY: [0.72, 1, 0.78] }
                  }
                  transition={{
                    duration: 0.55,
                    ease: EASE_OUT,
                    repeat: Infinity,
                    delay: index * 0.018,
                  }}
                />
              ))}
            </span>
            <span className="w-9 shrink-0 text-right text-xs tabular-nums text-muted-foreground">
              {formatDuration(item.duration)}
            </span>
            <motion.button
              type="button"
              aria-label={`${playing ? "Pause" : "Play"} ${item.name}`}
              onClick={() => onAudioToggle?.(item)}
              whileTap={{ scale: 0.94 }}
              transition={SPRING_PRESS}
              className="grid size-9 shrink-0 place-items-center rounded-full bg-foreground text-background outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background"
            >
              <AnimatePresence mode="wait" initial={false}>
                <motion.span
                  key={playing ? "pause" : "play"}
                  initial={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.8 }}
                  animate={{ opacity: 1, scale: 1 }}
                  exit={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.8 }}
                  transition={ITEM_TRANSITION}
                >
                  {playing ? (
                    <Pause className="size-4 fill-current" />
                  ) : (
                    <Play className="size-4 translate-x-px fill-current" />
                  )}
                </motion.span>
              </AnimatePresence>
            </motion.button>
          </>
        ) : (
          <>
            <span className="min-w-0 flex-1">
              <span className="block truncate text-sm font-medium text-foreground">
                {item.name}
              </span>
              {failed ? (
                <span className="block truncate text-[11px] text-destructive">
                  {item.error ?? "Upload failed"}
                </span>
              ) : null}
            </span>
            <span className="shrink-0 text-xs text-muted-foreground">
              {item.kind === "link" ? "Web" : size}
            </span>
            {item.kind === "link" && item.href ? (
              <a
                href={item.href}
                target="_blank"
                rel="noreferrer noopener"
                aria-label={`Open ${item.name}`}
                className="grid size-8 shrink-0 place-items-center rounded-lg text-muted-foreground outline-none transition-colors hover:bg-muted hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring"
              >
                <ExternalLink className="size-4" />
              </a>
            ) : null}
          </>
        )}

        {reduce ? (
          showUploadProgress ? (
            uploadProgress
          ) : null
        ) : (
          <AnimatePresence>
            {showUploadProgress ? uploadProgress : null}
          </AnimatePresence>
        )}
      </div>

      <RowAction
        label={item.name}
        onClick={() => {
          if (actionState === "failed") {
            onRetry?.(item);
            return;
          }
          onRemove(item);
        }}
        state={actionState}
        retryable={onRetry !== undefined}
        reduce={reduce}
      />
    </motion.li>
  );
}

export function AttachmentUpload({
  value,
  defaultValue,
  onValueChange,
  onFilesAdded,
  onFilesRejected,
  onRemove,
  onRetry,
  playingId,
  onAudioToggle,
  accept,
  multiple = true,
  maxFiles = 12,
  maxFileSize = DEFAULT_MAX_FILE_SIZE,
  disabled = false,
  title = "Drag and drop or browse files",
  description,
  attachmentsLabel = "Attachments",
  className,
  classNames,
}: AttachmentUploadProps) {
  const inputId = useId();
  const inputRef = useRef<HTMLInputElement>(null);
  const dragDepthRef = useRef(0);
  const ownedUrlsRef = useRef(new Set<string>());
  const lifecycleTimersRef = useRef(
    new Set<ReturnType<typeof setTimeout>>(),
  );
  const reduce = useReducedMotion() ?? false;
  const [dragging, setDragging] = useState(false);
  const [previewItem, setPreviewItem] =
    useState<AttachmentUploadItem | null>(null);
  const [uploadingIds, setUploadingIds] = useState<Set<string>>(
    () => new Set(),
  );
  const [uploadCompleteIds, setUploadCompleteIds] = useState<Set<string>>(
    () => new Set(),
  );
  const [removingIds, setRemovingIds] = useState<Set<string>>(
    () => new Set(),
  );
  const [items, setItems] = useControllableList({
    value,
    defaultValue,
    onValueChange,
  });
  const itemsRef = useRef(items);
  itemsRef.current = items;

  useEffect(
    () => () => {
      for (const url of ownedUrlsRef.current) URL.revokeObjectURL(url);
      ownedUrlsRef.current.clear();
      for (const timer of lifecycleTimersRef.current) {
        clearTimeout(timer);
      }
      lifecycleTimersRef.current.clear();
    },
    [],
  );

  const maxReached = items.length >= maxFiles;
  const scheduleLifecycle = useCallback(
    (callback: () => void, delay: number) => {
      const timer = setTimeout(() => {
        lifecycleTimersRef.current.delete(timer);
        callback();
      }, delay);
      lifecycleTimersRef.current.add(timer);
    },
    [],
  );

  const addFiles = useCallback(
    (incomingFiles: File[]) => {
      if (disabled || incomingFiles.length === 0) return;

      const availableSlots = Math.max(0, maxFiles - items.length);
      if (availableSlots === 0) {
        onFilesRejected?.(incomingFiles, "max-files");
        return;
      }

      const selectedFiles = incomingFiles.slice(
        0,
        multiple ? availableSlots : Math.min(1, availableSlots),
      );
      const oversized = selectedFiles.filter(
        (file) => file.size > maxFileSize,
      );
      const accepted = selectedFiles.filter(
        (file) => file.size <= maxFileSize,
      );

      if (oversized.length > 0) onFilesRejected?.(oversized, "too-large");
      if (incomingFiles.length > selectedFiles.length) {
        onFilesRejected?.(incomingFiles.slice(selectedFiles.length), "max-files");
      }

      const added = accepted.map((file, index) => {
        const kind = inferKind(file);
        const objectUrl = URL.createObjectURL(file);
        ownedUrlsRef.current.add(objectUrl);

        return {
          id: `${Date.now()}-${index}-${file.name}`,
          name: file.name,
          kind,
          size: file.size,
          previewUrl: kind === "image" ? objectUrl : undefined,
          href: objectUrl,
          currentTime: kind === "audio" ? 0 : undefined,
          duration: kind === "audio" ? 0 : undefined,
          file,
        };
      });

      if (added.length === 0) return;
      setItems([...items, ...added]);
      const addedIds = added.map((item) => item.id);
      setUploadingIds((current) => new Set([...current, ...addedIds]));
      scheduleLifecycle(
        () => {
          setUploadingIds((current) => {
            const next = new Set(current);
            for (const id of addedIds) next.delete(id);
            return next;
          });
          setUploadCompleteIds(
            (current) => new Set([...current, ...addedIds]),
          );
          scheduleLifecycle(() => {
            setUploadCompleteIds((current) => {
              const next = new Set(current);
              for (const id of addedIds) next.delete(id);
              return next;
            });
          }, UPLOAD_COMPLETE_HOLD_MS);
        },
        reduce ? 140 : UPLOAD_PROGRESS_MS,
      );
      onFilesAdded?.(added, accepted);
    },
    [
      disabled,
      items,
      maxFileSize,
      maxFiles,
      multiple,
      onFilesAdded,
      onFilesRejected,
      reduce,
      scheduleLifecycle,
      setItems,
    ],
  );

  const finalizeRemove = useCallback(
    (item: AttachmentUploadItem) => {
      const ownedUrl = [item.previewUrl, item.href].find(
        (url): url is string =>
          url !== undefined && ownedUrlsRef.current.has(url),
      );
      if (ownedUrl) {
        URL.revokeObjectURL(ownedUrl);
        ownedUrlsRef.current.delete(ownedUrl);
      }
      setPreviewItem((current) =>
        current?.id === item.id ? null : current,
      );
      setUploadingIds((current) => {
        const next = new Set(current);
        next.delete(item.id);
        return next;
      });
      setUploadCompleteIds((current) => {
        const next = new Set(current);
        next.delete(item.id);
        return next;
      });
      setItems(itemsRef.current.filter((entry) => entry.id !== item.id));
      onRemove?.(item);
    },
    [onRemove, setItems],
  );

  const requestRemove = useCallback(
    (item: AttachmentUploadItem) => {
      if (removingIds.has(item.id)) return;

      setRemovingIds((current) => new Set(current).add(item.id));
      scheduleLifecycle(
        () => {
          finalizeRemove(item);
          setRemovingIds((current) => {
            const next = new Set(current);
            next.delete(item.id);
            return next;
          });
        },
        reduce ? 140 : REMOVE_PENDING_MS,
      );
    },
    [
      finalizeRemove,
      reduce,
      removingIds,
      scheduleLifecycle,
    ],
  );

  const resetDrag = useCallback(() => {
    dragDepthRef.current = 0;
    setDragging(false);
  }, []);
  const closePreview = useCallback(() => setPreviewItem(null), []);

  useEffect(() => {
    if (
      previewItem &&
      !items.some((item) => item.id === previewItem.id)
    ) {
      setPreviewItem(null);
    }
  }, [items, previewItem]);

  const uploadOrder = Array.from(uploadingIds);
  const previewLayoutId = previewItem
    ? `attachment-image-${previewItem.id}`
    : undefined;

  return (
    <LayoutGroup id={inputId}>
      <div className={cn("w-full", className)}>
      <input
        ref={inputRef}
        id={inputId}
        type="file"
        aria-label="Upload attachments"
        accept={accept}
        multiple={multiple}
        disabled={disabled || maxReached}
        tabIndex={-1}
        className="sr-only"
        onChange={(event) => {
          addFiles(Array.from(event.currentTarget.files ?? []));
          event.currentTarget.value = "";
        }}
      />

      <motion.button
        type="button"
        disabled={disabled || maxReached}
        data-dragging={dragging}
        animate={
          reduce
            ? undefined
            : { scale: dragging ? 1.006 : 1 }
        }
        whileTap={reduce ? undefined : { scale: 0.995 }}
        transition={SPRING_PRESS}
        onClick={() => inputRef.current?.click()}
        onDragEnter={(event) => {
          if (disabled || maxReached) return;
          event.preventDefault();
          dragDepthRef.current += 1;
          setDragging(true);
        }}
        onDragOver={(event) => {
          if (disabled || maxReached) return;
          event.preventDefault();
          event.dataTransfer.dropEffect = "copy";
          setDragging(true);
        }}
        onDragLeave={(event) => {
          if (disabled || maxReached) return;
          event.preventDefault();
          dragDepthRef.current = Math.max(0, dragDepthRef.current - 1);
          if (dragDepthRef.current === 0) setDragging(false);
        }}
        onDrop={(event) => {
          if (disabled || maxReached) return;
          event.preventDefault();
          resetDrag();
          addFiles(Array.from(event.dataTransfer.files));
        }}
        className={cn(
          "group relative isolate flex min-h-52 w-full flex-col items-center justify-center overflow-hidden rounded-[2rem] bg-muted/65 p-2 text-center outline-none",
          "transition-colors duration-200 hover:bg-muted/85",
          "focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background",
          "data-[dragging=true]:bg-muted",
          "disabled:pointer-events-none disabled:opacity-55",
          classNames?.dropzone,
        )}
      >
        <span
          aria-hidden="true"
          className="absolute inset-2 -z-10 rounded-[1.5rem] border border-dashed border-muted-foreground/25 bg-background transition-[border-color,background-color] duration-200 group-hover:border-muted-foreground/45 group-data-[dragging=true]:border-foreground/65 group-data-[dragging=true]:bg-muted/20"
        />
        <motion.span
          aria-hidden="true"
          animate={
            reduce
              ? undefined
              : {
                  y: dragging ? -4 : 0,
                  scale: dragging ? 1.08 : 1,
                }
          }
          transition={ITEM_TRANSITION}
          className="mb-3 grid size-11 place-items-center rounded-2xl bg-muted text-foreground transition-colors duration-200 group-hover:bg-muted/80 group-data-[dragging=true]:bg-foreground group-data-[dragging=true]:text-background"
        >
          <Upload className="size-[18px]" />
        </motion.span>
        <span className="text-sm font-semibold tracking-[-0.01em] text-foreground">
          {maxReached ? "Attachment limit reached" : title}
        </span>
        <span className="mt-1 text-xs leading-5 text-muted-foreground">
          {maxReached
            ? `${items.length} of ${maxFiles} attachments added`
            : description ?? `Maximum ${formatMaxSize(maxFileSize)} file size`}
        </span>
      </motion.button>

      {items.length > 0 ? (
        <section className="mt-8" aria-labelledby={`${inputId}-attachments`}>
          <h3
            id={`${inputId}-attachments`}
            className="text-sm font-semibold text-foreground"
          >
            {attachmentsLabel}
          </h3>

          {items.length > 0 ? (
            <ul className={cn("mt-3 space-y-2", classNames?.list)}>
              <AnimatePresence initial={uploadOrder.length > 0}>
                {items.map((item) => (
                  <AttachmentRow
                    key={item.id}
                    item={item}
                    playing={playingId === item.id}
                    uploading={
                      uploadingIds.has(item.id) ||
                      item.status === "uploading"
                    }
                    uploadComplete={
                      uploadCompleteIds.has(item.id) ||
                      item.status === "complete"
                    }
                    failed={item.status === "failed"}
                    removing={removingIds.has(item.id)}
                    arrivalIndex={uploadOrder.indexOf(item.id)}
                    imageLayoutId={
                      reduce ? undefined : `attachment-image-${item.id}`
                    }
                    onAudioToggle={onAudioToggle}
                    onImagePreview={setPreviewItem}
                    onRemove={requestRemove}
                    onRetry={onRetry}
                    reduce={reduce}
                    className={classNames?.row}
                  />
                ))}
              </AnimatePresence>
            </ul>
          ) : null}
        </section>
      ) : null}

      <ImagePreviewDialog
        item={previewItem}
        layoutId={reduce ? undefined : previewLayoutId}
        onClose={closePreview}
        reduce={reduce}
      />
      </div>
    </LayoutGroup>
  );
}