Message Actions

// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.

export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;

/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";

/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
  type: "spring",
  stiffness: 500,
  damping: 30,
  mass: 0.6,
} as const;

/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
  type: "spring",
  stiffness: 460,
  damping: 30,
  mass: 0.55,
} as const;

/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
  type: "spring",
  stiffness: 420,
  damping: 40,
  mass: 0.5,
} as const;

/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
  type: "spring",
  stiffness: 360,
  damping: 32,
  mass: 0.6,
} as const;

/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
  stiffness: 200,
  damping: 15,
  mass: 0.3,
} as const;

/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
 * so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
  stiffness: 700,
  damping: 50,
  mass: 0.5,
} as const;

import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

"use client";

import { type RefObject, useEffect } from "react";

/**
 * What the dismissing gesture does to the control it landed on.
 *
 * `"pass-through"` is the platform norm (native popover light-dismiss): the
 * tap closes the overlay *and* activates whatever was under it. Use
 * `"consume"` where the open overlay sits over or beside controls that would
 * be costly to trigger by accident — the dismissal then swallows the
 * activation too, so the gesture only closes.
 */
export type DismissBehavior = "pass-through" | "consume";

export interface DismissOptions {
  /** Default `"pass-through"`. */
  behavior?: DismissBehavior;
  /** Dismiss on Escape as well. Default true. */
  escape?: boolean;
  /** Return true for an outside target that should *not* dismiss. Must be stable. */
  ignore?: (target: Element) => boolean;
}

/**
 * What every currently open dismiss scope counts as inside itself. A consumed
 * dismissal reads this to tell a stray gesture from one that belongs to an
 * overlay in front of it: overlays have no shared z-order to consult, but the
 * one the gesture landed in has said as much by registering it.
 */
const openScopes = new Set<(target: Element) => boolean>();

function claimedByAnotherScope(
  self: (target: Element) => boolean,
  target: Element,
) {
  for (const scope of openScopes) {
    if (scope !== self && scope(target)) return true;
  }
  return false;
}

// preventDefault on pointerdown does not suppress the click that follows, so
// consuming a gesture means swallowing that click itself. The swallower
// deliberately outlives the effect that installed it — the dismissal it
// belongs to has already unmounted or re-rendered by the time the click lands.
// It releases on that click, or on the next gesture if the pointer is dragged
// away and no click ever arrives, so it can never eat a later one. A keydown
// releases it too: a gesture that ends with neither a click nor a cancel would
// otherwise leave it armed, and the click Enter synthesizes on some focused
// control is not the one this dismissal was owed.
function consumeActivation(source: Event) {
  const swallow = (event: MouseEvent) => {
    event.preventDefault();
    event.stopPropagation();
    release();
  };
  const restart = (event: Event) => {
    if (event !== source) release();
  };
  const release = () => {
    window.removeEventListener("click", swallow, true);
    window.removeEventListener("pointerdown", restart, true);
    window.removeEventListener("pointercancel", restart, true);
    window.removeEventListener("keydown", release, true);
  };
  window.addEventListener("click", swallow, true);
  window.addEventListener("pointerdown", restart, true);
  window.addEventListener("pointercancel", restart, true);
  window.addEventListener("keydown", release, true);
}

/**
 * Close an open overlay on Escape or a pointerdown outside `ref`. Pass `null`
 * for `ref` when what counts as inside isn't one element, and say so with
 * `ignore` instead.
 *
 * The pointerdown listener is capture-phase: a bubble-phase one is blinded by
 * any handler in between that stops propagation, and an overlay cannot know
 * what it is layered over. `onDismiss` and `ignore` must be stable (wrap in
 * useCallback) so the listeners aren't re-bound every render while open.
 */
export function useDismiss(
  open: boolean,
  onDismiss: () => void,
  ref: RefObject<HTMLElement | null> | null,
  {
    behavior = "pass-through",
    escape: dismissOnEscape = true,
    ignore,
  }: DismissOptions = {},
) {
  useEffect(() => {
    if (!open) return;
    const inside = (target: Element) =>
      Boolean(ref?.current?.contains(target)) || Boolean(ignore?.(target));
    const onKey = (event: KeyboardEvent) => {
      if (dismissOnEscape && event.key === "Escape") onDismiss();
    };
    const onPointer = (event: PointerEvent) => {
      const target = event.target as Element | null;
      if (!target || inside(target)) return;
      // Outside this overlay, but inside one that is also open: the gesture is
      // that overlay's to answer, and swallowing its click from behind would
      // cost the user the control they actually aimed at.
      if (behavior === "consume" && !claimedByAnotherScope(inside, target)) {
        consumeActivation(event);
      }
      onDismiss();
    };
    openScopes.add(inside);
    window.addEventListener("keydown", onKey);
    window.addEventListener("pointerdown", onPointer, true);
    return () => {
      openScopes.delete(inside);
      window.removeEventListener("keydown", onKey);
      window.removeEventListener("pointerdown", onPointer, true);
    };
  }, [open, onDismiss, ref, behavior, dismissOnEscape, ignore]);
}

// Shared touch primitives. iOS and iPadOS run their own gestures on top of the
// page — the long-press selection callout and the selection it drags in with
// it — and they win: once the platform claims a touch it cancels ours
// mid-gesture, so a press-and-hold or a drag simply dies. Surfaces that own
// their gesture have to opt out.
//
// What the two classes below cover, precisely:
// - `-webkit-touch-callout: none` stops iOS's long-press callout. WebKit-only:
//   it is not a property other engines have, so it is inert everywhere else.
// - `user-select: none` stops the long-press selection on every engine,
//   Android included, and stops a drag from painting a selection under the
//   cursor. It is inherited, so it reaches every descendant — which is why the
//   two classes differ only in whether they apply it unconditionally.
// What neither covers:
// - Chrome for Android's long-press menu on a link or an image. No CSS
//   suppresses it; a gesture surface that wraps one needs its own
//   `onContextMenu` with `preventDefault()`.
// - The native drag of an `<img>` or `<a>` descendant. `-webkit-user-drag` is
//   not inherited and plain divs and buttons are not drag sources, so setting
//   it on the surface does nothing — the child itself needs `draggable={false}`.

/**
 * Classes for a surface that *is* the control: a thumb, a drum, a stage, a
 * handle, a hold button. Selection is suppressed on every input, because a
 * drag that highlights the control's own label is wrong on a mouse too.
 * Compose with `touch-none` when the surface also owns the scroll axis — leave
 * it off when the page must still scroll from there.
 */
export const TOUCH_GESTURE_CLASS = "select-none [-webkit-touch-callout:none]";

/**
 * The same opt-out for a gesture surface that wraps content the consumer owns:
 * a scroller, a context-menu trigger, a sheet header, a list row. Selection is
 * suppressed only where the platform runs its own press gestures — a coarse
 * pointer — so a mouse user can still select and copy that content. If the
 * gesture itself would paint a selection under the cursor, add `select-none`
 * for the duration of the gesture rather than reaching for
 * `TOUCH_GESTURE_CLASS`.
 *
 * `pointer: coarse` describes the *primary* pointer and nothing else, so a
 * hybrid machine reads it wrong in both directions: a tablet with a mouse
 * plugged in keeps touch as primary and loses mouse selection, and a laptop
 * with a touchscreen keeps the mouse as primary and leaves selection live
 * under a finger. No media query can answer per interaction — the query is
 * about the device, and the question is about the gesture in progress. The
 * default stays here because it is right on the machines that are one thing or
 * the other, and losing a selection is a nuisance; where the miss costs a
 * *gesture* instead, the surface pairs it with `holdSelection` on the press.
 */
export const TOUCH_GESTURE_CONTENT_CLASS =
  "[-webkit-touch-callout:none] pointer-coarse:select-none";

/**
 * Grow a small control's *hit area* to at least 44×44px (WCAG 2.5.5, Apple
 * HIG) on a coarse pointer, without changing what it looks like or the space
 * it takes in layout. An invisible `::after` box, centered on the control and
 * `max(100%, 2.75rem)` on each axis, catches the taps: a 32px icon button
 * reaches 6px past each edge, a wide 40px button only grows vertically, and a
 * control already 44px or larger is left as it is. Hit-testing a pseudo
 * element lands on its owner, so handlers, focus and `:active` all behave.
 *
 * Mouse and trackpad rendering is untouched — nothing here applies outside
 * `pointer: coarse`. Requirements on the element it goes on:
 * - It must be the containing block: add `relative` (and keep it mergeable, so
 *   a consumer's `absolute` still wins through `cn`).
 * - It must not clip itself (`overflow-hidden`), or the overhang is clipped
 *   away along with its hit area.
 * - It must render children: `<input>` and other void elements have no
 *   `::after`. Put it on the wrapper or label instead.
 * - It must not already use `::after` for something visible.
 *
 * Centered 44px means two 32px buttons with a 4px gap overlap by 8px; the
 * later one wins that strip, which still ends well short of the earlier
 * button's visual center. Below a ~32px pitch the later neighbour starts
 * eating into that center — use `TOUCH_TARGET_Y_CLASS` for such dense rows.
 *
 * The overhang is real geometry: inside a scroll container it counts as
 * scrollable overflow, so a control flush against a scroller's edge can add a
 * few pixels of scroll on touch screens. Give such a scroller a little padding
 * on that side.
 */
export const TOUCH_TARGET_CLASS =
  "pointer-coarse:after:absolute pointer-coarse:after:top-1/2 pointer-coarse:after:left-1/2 pointer-coarse:after:size-[max(100%,2.75rem)] pointer-coarse:after:-translate-x-1/2 pointer-coarse:after:-translate-y-1/2 pointer-coarse:after:content-['']";

/**
 * `TOUCH_TARGET_CLASS` on the vertical axis only, for controls packed tighter
 * than ~32px apart in a row (pagination dots, dense swatches), where growing
 * sideways would hand most of each control to its neighbour. Same rules.
 */
export const TOUCH_TARGET_Y_CLASS =
  "pointer-coarse:after:absolute pointer-coarse:after:inset-x-0 pointer-coarse:after:top-1/2 pointer-coarse:after:h-[max(100%,2.75rem)] pointer-coarse:after:-translate-y-1/2 pointer-coarse:after:content-['']";

/**
 * Suppress selection on `element` for as long as a gesture is running on it,
 * whatever the primary pointer of the machine happens to be. Returns the
 * release. Inline, so it wins over the class above and is gone again the
 * moment the gesture ends.
 *
 * For the press gestures a native selection would otherwise steal — a
 * long-press that opens a menu. Elsewhere prefer the classes: a surface that
 * takes selection away for the whole session is a surface whose text nobody
 * can copy.
 */
export function holdSelection(element: HTMLElement) {
  element.style.setProperty("user-select", "none");
  element.style.setProperty("-webkit-user-select", "none");
  return () => {
    element.style.removeProperty("user-select");
    element.style.removeProperty("-webkit-user-select");
  };
}

/**
 * Pointer capture, best effort. WebKit throws `NotFoundError` when the pointer
 * is already gone by the time the handler runs — routine on iOS, where the
 * system can claim the touch first — and an uncaught throw takes the rest of
 * the handler, the gesture included, down with it. Touch pointers carry
 * implicit capture anyway, so losing it is never fatal.
 */
export function capturePointer(element: Element, pointerId: number) {
  try {
    element.setPointerCapture(pointerId);
  } catch {
    // Pointer is no longer active — implicit capture still applies on touch.
  }
}

/** Release a capture taken with `capturePointer`, ignoring a stale pointer. */
export function releasePointer(element: Element, pointerId: number) {
  try {
    if (element.hasPointerCapture(pointerId)) {
      element.releasePointerCapture(pointerId);
    }
  } catch {
    // Capture was already dropped by the browser.
  }
}

/**
 * Whether this event came from a pointer that is *hovering*: not a touch, and
 * not currently pressed. Which input the user is holding right now is not
 * something a device capability can answer — a touchscreen laptop hovers and
 * taps, and iPadOS reports a fine hovering pointer for a finger — so both
 * paths stay live and each handler branches on the event it was given.
 *
 * A pen resting on the glass is making contact, not hovering: `buttons` is the
 * tell, and it sends a pen tap down the same route a finger takes.
 *
 * This answers what an *enter* asks. A leave is the other half of a pair and
 * has to be read against the enter that started it — `useHoverGesture` in
 * `lib/hooks/use-hover-gesture` does that, and hover surfaces should use it
 * rather than asking this question twice.
 */
export const isHoveringPointer = (event: {
  pointerType: string;
  buttons: number;
}) => event.pointerType !== "touch" && event.buttons === 0;

"use client";

import { useEffect, useState } from "react";

/**
 * Returns true only on devices that have a true hover (mouse / trackpad).
 * Touch devices fire phantom `:hover` on tap that sticks until tap-elsewhere
 * — gate hover-only effects (scale lifts, magnetic pulls) behind this.
 */
export function useHoverCapable() {
  const [canHover, setCanHover] = useState(false);

  useEffect(() => {
    if (typeof window === "undefined" || !window.matchMedia) return;
    const mq = window.matchMedia("(hover: hover) and (pointer: fine)");
    const update = () => setCanHover(mq.matches);
    update();
    mq.addEventListener?.("change", update);
    return () => mq.removeEventListener?.("change", update);
  }, []);

  return canHover;
}

"use client";

import { useCallback, useState } from "react";
import { getFaviconUrl } from "@/lib/favicon";

/**
 * Resolves a site favicon and drops it once it is known to be unusable, so
 * callers can draw their own glyph instead of a broken image. Plenty of sites
 * answer `/favicon.ico` with a 403 or 404, and `onError` is not enough to catch
 * it: an image the browser starts loading from server-rendered HTML usually
 * fails before React attaches a handler, and that event is never replayed.
 * `decode()` settles on the image's final state instead of relying on an event
 * firing at the right moment.
 */
export function useFavicon(url?: string) {
  const resolved = url ? getFaviconUrl(url) : null;
  const [failedSrc, setFailedSrc] = useState<string | null>(null);
  const src = resolved && resolved !== failedSrc ? resolved : null;

  const ref = useCallback(
    (img: HTMLImageElement | null) => {
      if (!img || !src) return;

      let released = false;
      img.decode().catch(() => {
        if (!released) setFailedSrc(src);
      });

      // The node is going away or the source changed; a late rejection then
      // describes an image we are no longer showing.
      return () => {
        released = true;
      };
    },
    [src],
  );

  return { src, ref };
}

"use client";

import { useMemo, useRef } from "react";
import { isHoveringPointer } from "@/lib/touch";

interface BoundaryEvent {
  pointerId: number;
  pointerType: string;
  buttons: number;
}

export interface HoverGesture {
  /** True when this enter starts a hover: the pointer arrived resting, not pressing. */
  enter: (event: BoundaryEvent) => boolean;
  /** True when this leave ends a hover that entered as one. */
  leave: (event: BoundaryEvent) => boolean;
}

/**
 * Pairs a surface's enter with its leave, per pointer.
 *
 * `isHoveringPointer` answers the question the *enter* asks — is this pointer
 * resting on the surface or pressing it — and both boundary cases go wrong if
 * the leave is asked the same question again:
 *
 * - A pen with no hover never rests. It arrives in contact, taps, and the spec
 *   then requires its boundary events after `pointerup`, so the leave carries
 *   `buttons: 0` and reads as a mouse gliding off. Hover teardown then undid
 *   the tap — the panel the pen had just opened closed under it.
 * - A mouse pressed on the surface and dragged off leaves with `buttons: 1`.
 *   Skipping teardown there strands the surface open: the release happens
 *   outside, and no second leave ever comes.
 *
 * So the state a hover holds is released by the pointer that took it, whatever
 * the buttons say at the boundary, and a pointer that arrived in contact never
 * took it in the first place. Contact is the exception tracked here, not
 * hover: a leave from a pointer this surface never saw enter — mounted under
 * the cursor, say — still counts, since the alternative is state with no way
 * out.
 */
export function useHoverGesture(): HoverGesture {
  const contact = useRef(new Set<number>());

  return useMemo(
    () => ({
      enter: (event) => {
        if (isHoveringPointer(event)) {
          contact.current.delete(event.pointerId);
          return true;
        }
        contact.current.add(event.pointerId);
        return false;
      },
      leave: (event) => {
        const arrivedInContact = contact.current.delete(event.pointerId);
        return !arrivedInContact && event.pointerType !== "touch";
      },
    }),
    [],
  );
}

"use client";

import { useMemo, useRef } from "react";

/** What a pointerdown recorded, read back by the click that ends its gesture. */
export interface TapRecord<S> {
  /** Which input started the gesture. */
  pointerType: string;
  /** What the surface was showing when it started. */
  state: S;
}

export interface TapGesture<S> {
  /** Record the gesture a pointerdown starts, with the state it starts in. */
  start: (event: { pointerType: string }, state: S) => void;
  /** Read the record and clear it. `null` when no pointer is behind this click. */
  take: () => TapRecord<S> | null;
  /** Drop the record: this gesture will never spend it on a click. */
  drop: () => void;
}

/**
 * The pointer gesture behind a click, recorded where the click cannot report
 * it. A `click` carries no `pointerType` in the engines that matter, so the
 * `pointerdown` before it is the only thing that says which input activated
 * the control — and whether one did at all, since keyboard activation
 * synthesizes a click with no pointer behind it.
 *
 * State goes in with the record because a click reports that no better: a
 * browser that focuses a control on contact can open the very panel the tap
 * was meant to open, and reading "is it open" at click time then undoes it.
 * What the gesture started against is what it acts on.
 *
 * The record is spent by one click and dropped by everything else, because a
 * record that outlives its gesture is worse than none:
 *
 * - A scroll or an OS gesture takes the touch away — `pointercancel`, no click
 *   ever — and the finger would sit in the record until some later click.
 * - That later click is often `Enter` on a keyboard, which arrives with no
 *   pointerdown of its own and would inherit the abandoned finger. A keydown
 *   is the start of a keyboard activation and never part of a tap, so it drops
 *   the record too.
 *
 * Both ends have to be wired by the surface: `drop` on `onPointerCancel` and
 * on `onKeyDown`.
 */
export function useTapGesture<S>(): TapGesture<S> {
  const record = useRef<TapRecord<S> | null>(null);

  return useMemo(
    () => ({
      start: (event, state) => {
        record.current = { pointerType: event.pointerType, state };
      },
      take: () => {
        const spent = record.current;
        record.current = null;
        return spent;
      },
      drop: () => {
        record.current = null;
      },
    }),
    [],
  );
}

/** Resolve a website URL to its conventional root favicon location. */
export function getFaviconUrl(value: string) {
  try {
    return new URL("/favicon.ico", value).toString();
  } catch {
    return null;
  }
}

"use client";
// karaui.kamisama-v0.my.id/components/agents/message-actions

import {
  Copy,
  MoreHorizontal,
  RotateCw,
  Share,
  ThumbsDown,
  ThumbsUp,
} from "lucide-react";
import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import {
  type ComponentPropsWithRef,
  type ReactNode,
  useEffect,
  useRef,
  useState,
} from "react";
import { Button } from "@/components/motion/button";
import {
  DropdownMenu,
  DropdownMenuContent,
  DropdownMenuItem,
  DropdownMenuTrigger,
} from "@/components/motion/dropdown-menu";
import {
  MorphPopover,
  MorphPopoverContent,
} from "@/components/motion/popover-morph";
import { Textarea } from "@/components/motion/textarea";
import { ToggleGroup, ToggleGroupItem } from "@/components/motion/toggle-group";
import { EASE_OUT, SPRING_PRESS, SPRING_SWAP } from "@/lib/ease";
import { cn } from "@/lib/utils";

export type MessageFeedback = "up" | "down" | null;

export interface MessageFeedbackReason {
  value: string;
  label: string;
}

export interface MessageFeedbackDetails {
  reasons: string[];
  comment: string;
}

export interface MessageMoreAction {
  value: string;
  label: string;
  icon?: ReactNode;
  destructive?: boolean;
  disabled?: boolean;
}

export interface MessageActionsProps
  extends Omit<ComponentPropsWithRef<"div">, "children"> {
  /** Plain text copied by the copy action. */
  copyText?: string;
  /** Overrides the built-in clipboard write. */
  onCopy?: () => void | Promise<void>;
  /** Shows the regenerate action. A returned promise keeps the icon spinning. */
  onRegenerate?: () => void | Promise<void>;
  feedback?: MessageFeedback;
  defaultFeedback?: MessageFeedback;
  onFeedbackChange?: (feedback: MessageFeedback) => void;
  /** Reasons offered after a thumbs-down. Pass `[]` to skip the popover. */
  feedbackReasons?: MessageFeedbackReason[];
  onFeedbackSubmit?: (details: MessageFeedbackDetails) => void;
  onShare?: () => void;
  moreActions?: MessageMoreAction[];
  onMoreAction?: (value: string) => void;
  /**
   * `hover` reveals the row while the surrounding `Message` / message group is
   * hovered or focused (always visible on touch); `always` keeps it shown —
   * use it for the last message.
   */
  visibility?: "hover" | "always";
}

export const DEFAULT_FEEDBACK_REASONS: MessageFeedbackReason[] = [
  { value: "incorrect", label: "Incorrect" },
  { value: "unhelpful", label: "Not helpful" },
  { value: "incomplete", label: "Incomplete" },
  { value: "instructions", label: "Ignored instructions" },
  { value: "unsafe", label: "Harmful" },
];

function ActionButton({
  label,
  pressed,
  onClick,
  children,
  className,
}: {
  label: string;
  pressed?: boolean;
  onClick?: () => void;
  children: ReactNode;
  className?: string;
}) {
  const reduce = useReducedMotion() ?? false;
  return (
    <motion.button
      type="button"
      aria-label={label}
      title={label}
      aria-pressed={pressed}
      onClick={onClick}
      whileTap={reduce ? undefined : { scale: 0.88 }}
      transition={SPRING_PRESS}
      className={cn(
        "relative grid size-7 place-items-center rounded-md text-muted-foreground outline-none transition-colors hover:bg-muted hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring",
        pressed && "text-foreground",
        className,
      )}
    >
      {children}
    </motion.button>
  );
}

function DrawnCheck({ reduce }: { reduce: boolean }) {
  return (
    <svg
      aria-hidden="true"
      viewBox="0 0 24 24"
      fill="none"
      stroke="currentColor"
      strokeWidth="2.25"
      strokeLinecap="round"
      strokeLinejoin="round"
      className="size-3.5"
    >
      <motion.path
        d="M5 12.5l4.5 4.5L19 7.5"
        initial={{ pathLength: reduce ? 1 : 0 }}
        animate={{ pathLength: 1 }}
        transition={{ duration: reduce ? 0 : 0.28, ease: EASE_OUT, delay: 0.04 }}
      />
    </svg>
  );
}

/** Outline thumb with a filled twin that pops in over it when active. */
function Thumb({
  direction,
  active,
  reduce,
}: {
  direction: "up" | "down";
  active: boolean;
  reduce: boolean;
}) {
  const Icon = direction === "up" ? ThumbsUp : ThumbsDown;
  return (
    <span className="relative grid size-3.5 place-items-center">
      <Icon aria-hidden="true" className="size-3.5" />
      <AnimatePresence initial={false}>
        {active ? (
          <motion.span
            key="fill"
            aria-hidden="true"
            className="absolute inset-0 grid place-items-center"
            initial={
              reduce ? { opacity: 0 } : { opacity: 0, scale: 0.4, rotate: 0 }
            }
            animate={
              reduce
                ? { opacity: 1 }
                : {
                    opacity: 1,
                    scale: [0.4, 1.28, 1],
                    rotate: [0, direction === "up" ? -14 : 14, 0],
                  }
            }
            exit={{ opacity: 0, scale: reduce ? 1 : 0.6, transition: { duration: 0.12 } }}
            transition={
              reduce ? { duration: 0.12 } : { duration: 0.42, ease: EASE_OUT }
            }
          >
            <Icon className="size-3.5 fill-current" />
          </motion.span>
        ) : null}
      </AnimatePresence>
    </span>
  );
}

export function MessageActions({
  copyText,
  onCopy,
  onRegenerate,
  feedback,
  defaultFeedback = null,
  onFeedbackChange,
  feedbackReasons = DEFAULT_FEEDBACK_REASONS,
  onFeedbackSubmit,
  onShare,
  moreActions = [],
  onMoreAction,
  visibility = "hover",
  className,
  ...props
}: MessageActionsProps) {
  const reduce = useReducedMotion() ?? false;
  const [copied, setCopied] = useState(false);
  const [spins, setSpins] = useState(0);
  const [regenerating, setRegenerating] = useState(false);
  const [internalFeedback, setInternalFeedback] =
    useState<MessageFeedback>(defaultFeedback);
  const [popoverOpen, setPopoverOpen] = useState(false);
  const [menuOpen, setMenuOpen] = useState(false);
  const [reasons, setReasons] = useState<string[]>([]);
  const [comment, setComment] = useState("");
  const [thanked, setThanked] = useState(false);
  const [announcement, setAnnouncement] = useState("");
  const copyTimer = useRef<number | undefined>(undefined);
  const thanksTimer = useRef<number | undefined>(undefined);
  const downRef = useRef<HTMLSpanElement>(null);
  const panelRef = useRef<HTMLDivElement>(null);
  const current = feedback ?? internalFeedback;
  const canCopy = Boolean(copyText || onCopy);

  useEffect(
    () => () => {
      window.clearTimeout(copyTimer.current);
      window.clearTimeout(thanksTimer.current);
    },
    [],
  );

  const copy = async () => {
    try {
      if (onCopy) await onCopy();
      else if (copyText) await navigator.clipboard?.writeText(copyText);
    } catch {
      setAnnouncement("Copy failed");
      return;
    }
    setCopied(true);
    setAnnouncement("Copied to clipboard");
    window.clearTimeout(copyTimer.current);
    copyTimer.current = window.setTimeout(() => setCopied(false), 1600);
  };

  const regenerate = async () => {
    if (!onRegenerate || regenerating) return;
    setSpins((count) => count + 1);
    const result = onRegenerate();
    if (result && typeof result.then === "function") {
      setRegenerating(true);
      try {
        await result;
      } finally {
        setRegenerating(false);
      }
    }
  };

  const setFeedback = (next: MessageFeedback) => {
    if (feedback === undefined) setInternalFeedback(next);
    onFeedbackChange?.(next);
  };

  const openPopover = (next: boolean) => {
    if (!next && panelRef.current?.contains(document.activeElement)) {
      downRef.current?.querySelector("button")?.focus({ preventScroll: true });
    }
    setPopoverOpen(next);
    if (next) {
      setReasons([]);
      setComment("");
      setThanked(false);
    }
  };

  const toggleUp = () => {
    openPopover(false);
    setFeedback(current === "up" ? null : "up");
  };

  const toggleDown = () => {
    if (current === "down") {
      setFeedback(null);
      openPopover(false);
      return;
    }
    setFeedback("down");
    if (feedbackReasons.length) openPopover(true);
  };

  const submit = () => {
    onFeedbackSubmit?.({ reasons, comment: comment.trim() });
    setThanked(true);
    setAnnouncement("Thanks for the feedback");
    window.clearTimeout(thanksTimer.current);
    thanksTimer.current = window.setTimeout(() => openPopover(false), 1100);
  };

  // Move focus into the panel once it has mounted and been measured.
  useEffect(() => {
    if (!popoverOpen) return;
    const frame = requestAnimationFrame(() =>
      panelRef.current
        ?.querySelector<HTMLElement>("[aria-pressed], textarea")
        ?.focus({ preventScroll: true }),
    );
    return () => cancelAnimationFrame(frame);
  }, [popoverOpen]);

  const pinned = visibility === "always" || popoverOpen || menuOpen;

  return (
    <div
      data-slot="message-actions"
      data-visible={pinned || undefined}
      className={cn(
        "flex items-center gap-0.5 transition-[opacity,translate] duration-200 ease-out motion-reduce:translate-y-0",
        pinned
          ? "translate-y-0 opacity-100"
          : "translate-y-0.5 opacity-0 focus-within:translate-y-0 focus-within:opacity-100 group-hover/message:translate-y-0 group-hover/message:opacity-100 group-hover/message-group:translate-y-0 group-hover/message-group:opacity-100 [@media(hover:none)]:translate-y-0 [@media(hover:none)]:opacity-100",
        className,
      )}
      {...props}
    >
      {canCopy ? (
        <ActionButton label={copied ? "Copied" : "Copy"} onClick={copy}>
          <AnimatePresence initial={false} mode="popLayout">
            <motion.span
              key={copied ? "check" : "copy"}
              className="grid place-items-center"
              initial={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.6 }}
              animate={{ opacity: 1, scale: 1 }}
              exit={
                reduce
                  ? { opacity: 0, transition: { duration: 0.1 } }
                  : { opacity: 0, scale: 0.6, transition: { duration: 0.1 } }
              }
              transition={reduce ? { duration: 0.12 } : SPRING_SWAP}
            >
              {copied ? (
                <DrawnCheck reduce={reduce} />
              ) : (
                <Copy aria-hidden="true" className="size-3.5" />
              )}
            </motion.span>
          </AnimatePresence>
        </ActionButton>
      ) : null}

      {onRegenerate ? (
        <ActionButton
          label={regenerating ? "Regenerating" : "Regenerate"}
          onClick={regenerate}
        >
          <motion.span
            aria-hidden="true"
            className="grid place-items-center"
            animate={
              reduce
                ? undefined
                : regenerating
                  ? { rotate: [spins * 360, spins * 360 + 360] }
                  : { rotate: spins * 360 }
            }
            transition={
              regenerating
                ? {
                    duration: 0.8,
                    ease: "linear",
                    repeat: Number.POSITIVE_INFINITY,
                  }
                : { duration: 0.55, ease: EASE_OUT }
            }
          >
            <RotateCw className="size-3.5" />
          </motion.span>
        </ActionButton>
      ) : null}

      <ActionButton label="Good response" pressed={current === "up"} onClick={toggleUp}>
        <Thumb direction="up" active={current === "up"} reduce={reduce} />
      </ActionButton>

      <MorphPopover open={popoverOpen} onOpenChange={openPopover}>
        <span ref={downRef} className="inline-flex">
          <ActionButton
            label="Bad response"
            pressed={current === "down"}
            onClick={toggleDown}
          >
            <Thumb direction="down" active={current === "down"} reduce={reduce} />
          </ActionButton>
        </span>
        <MorphPopoverContent side="bottom" align="start" radius={14} className="w-72">
          <div ref={panelRef} className="p-3">
            <AnimatePresence mode="popLayout" initial={false}>
              {thanked ? (
                <motion.div
                  key="thanks"
                  initial={reduce ? { opacity: 0 } : { opacity: 0, y: 6 }}
                  animate={{ opacity: 1, y: 0 }}
                  transition={reduce ? { duration: 0.12 } : SPRING_SWAP}
                  className="flex items-center gap-2 py-6 text-sm text-foreground"
                >
                  <span className="mx-auto flex items-center gap-2">
                    <span className="grid size-6 place-items-center rounded-full bg-muted">
                      <DrawnCheck reduce={reduce} />
                    </span>
                    Thanks for the feedback
                  </span>
                </motion.div>
              ) : (
                <motion.div
                  key="form"
                  exit={{ opacity: 0, transition: { duration: 0.1 } }}
                >
                  <p className="text-sm font-medium text-foreground">
                    What went wrong?
                  </p>
                  <p className="mt-0.5 text-xs text-muted-foreground">
                    Pick any that apply.
                  </p>
                  <ToggleGroup
                    type="multiple"
                    size="sm"
                    variant="default"
                    value={reasons}
                    onValueChange={setReasons}
                    aria-label="Feedback reasons"
                    className="mt-2.5 flex w-full flex-wrap gap-1.5 rounded-none border-0 bg-transparent p-0"
                  >
                    {feedbackReasons.map((reason) => (
                      <ToggleGroupItem
                        key={reason.value}
                        value={reason.value}
                        className="rounded-full border border-border px-2.5"
                      >
                        {reason.label}
                      </ToggleGroupItem>
                    ))}
                  </ToggleGroup>
                  <Textarea
                    value={comment}
                    onChange={setComment}
                    placeholder="Tell us more (optional)"
                    aria-label="Additional feedback"
                    minRows={2}
                    maxRows={4}
                    className="mt-2.5"
                  />
                  <div className="mt-2.5 flex justify-end gap-1.5">
                    <Button
                      type="button"
                      size="sm"
                      variant="ghost"
                      onClick={() => openPopover(false)}
                    >
                      Cancel
                    </Button>
                    <Button
                      type="button"
                      size="sm"
                      disabled={!reasons.length && !comment.trim()}
                      onClick={submit}
                    >
                      Submit
                    </Button>
                  </div>
                </motion.div>
              )}
            </AnimatePresence>
          </div>
        </MorphPopoverContent>
      </MorphPopover>

      {onShare ? (
        <ActionButton label="Share" onClick={onShare}>
          <Share aria-hidden="true" className="size-3.5" />
        </ActionButton>
      ) : null}

      {moreActions.length ? (
        <DropdownMenu open={menuOpen} onOpenChange={setMenuOpen}>
          <DropdownMenuTrigger>
            <button
              type="button"
              aria-label="More actions"
              title="More actions"
              className="grid size-7 place-items-center rounded-md text-muted-foreground outline-none transition-colors hover:bg-muted hover:text-foreground focus-visible:ring-2 focus-visible:ring-ring data-[state=open]:bg-muted data-[state=open]:text-foreground"
            >
              <MoreHorizontal aria-hidden="true" className="size-3.5" />
            </button>
          </DropdownMenuTrigger>
          <DropdownMenuContent align="start" className="w-48">
            {moreActions.map((action) => (
              <DropdownMenuItem
                key={action.value}
                icon={action.icon}
                variant={action.destructive ? "destructive" : "default"}
                disabled={action.disabled}
                onSelect={() => onMoreAction?.(action.value)}
              >
                {action.label}
              </DropdownMenuItem>
            ))}
          </DropdownMenuContent>
        </DropdownMenu>
      ) : null}

      <span aria-live="polite" className="sr-only">
        {announcement}
      </span>
    </div>
  );
}

export type {
  ButtonLinkProps,
  ButtonProps,
  ButtonSize,
  ButtonVariant,
} from "./base";
export { Button, ButtonLink } from "./base";
export type { MagneticButtonProps } from "./magnetic";
export { MagneticButton } from "./magnetic";
export type { ButtonState, StatefulButtonProps } from "./stateful";
export { StatefulButton } from "./stateful";

"use client";

import { Check, ChevronRight } from "lucide-react";
import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import {
  cloneElement,
  createContext,
  isValidElement,
  type MutableRefObject,
  type ReactElement,
  type FocusEvent as ReactFocusEvent,
  type KeyboardEvent as ReactKeyboardEvent,
  type MouseEvent as ReactMouseEvent,
  type ReactNode,
  type PointerEvent as ReactPointerEvent,
  type Ref,
  useCallback,
  useContext,
  useEffect,
  useId,
  useMemo,
  useRef,
  useState,
} from "react";
import { createPortal } from "react-dom";
import {
  type PlacementAlign,
  type PlacementSide,
  resolvePlacement,
} from "@/components/motion/anchored-placement";
import { usePopoverPortalPosition } from "@/components/motion/popover-position";
import { EASE_OUT, SPRING_LAYOUT, SPRING_PANEL } from "@/lib/ease";
import { useDismiss } from "@/lib/hooks/use-dismiss";
import { cn } from "@/lib/utils";

/* -------------------------------------------------------------------------- */
/*                                   Levels                                   */
/* -------------------------------------------------------------------------- */

/** Where focus lands when a panel opens. */
type FocusIntent = "first" | "last" | "content" | "none";

// Hovering a sub trigger waits this long before opening, so a pointer just
// passing over the row on its way down the list doesn't flash a submenu.
const SUB_OPEN_DELAY = 100;
// Leaving the sub trigger (or hovering a sibling) closes the submenu only
// after this grace, so a diagonal move toward the submenu that clips a
// neighbouring row doesn't snap it shut.
const SUB_CLOSE_DELAY = 220;
const TYPEAHEAD_RESET = 500;

/**
 * One open panel: the root menu or a submenu. Items, the active-row
 * highlight and keyboard navigation all read the nearest level, so a submenu
 * is the same machinery one step down.
 */
interface MenuLevel {
  /** Shared by every panel and the trigger of one menu tree (dismissal scope). */
  rootId: string;
  /** Scope for this panel's layoutId highlight. */
  levelId: string;
  open: boolean;
  isSub: boolean;
  triggerId: string;
  contentId: string;
  triggerRef: MutableRefObject<HTMLElement | null>;
  contentRef: MutableRefObject<HTMLDivElement | null>;
  focusIntent: MutableRefObject<FocusIntent>;
  activeId: string | null;
  setActiveId: (id: string | null) => void;
  /** Id of the child submenu currently open from this panel. */
  openSub: string | null;
  setOpenSub: (id: string | null) => void;
  scheduleSubClose: () => void;
  cancelSubClose: () => void;
  /** Close this panel only (root: the whole menu). */
  close: (restoreFocus: boolean) => void;
  /** Close the whole menu tree. */
  closeAll: (restoreFocus: boolean) => void;
  /** Open the root menu (used by the trigger). */
  openRoot: () => void;
  reduce: boolean;
}

const MenuLevelContext = createContext<MenuLevel | null>(null);

function useMenuLevel(component: string) {
  const level = useContext(MenuLevelContext);
  if (!level) throw new Error(`${component} must be used within <DropdownMenu>`);
  return level;
}

/** Per-panel state shared by the root and every submenu. */
function useLevelCore(open: boolean) {
  const [activeId, setActiveId] = useState<string | null>(null);
  const [openSub, setOpenSubState] = useState<string | null>(null);
  const subCloseTimer = useRef<ReturnType<typeof setTimeout> | null>(null);

  const cancelSubClose = useCallback(() => {
    if (subCloseTimer.current) clearTimeout(subCloseTimer.current);
    subCloseTimer.current = null;
  }, []);

  const setOpenSub = useCallback(
    (id: string | null) => {
      cancelSubClose();
      setOpenSubState(id);
    },
    [cancelSubClose],
  );

  const scheduleSubClose = useCallback(() => {
    cancelSubClose();
    subCloseTimer.current = setTimeout(() => {
      subCloseTimer.current = null;
      setOpenSubState(null);
    }, SUB_CLOSE_DELAY);
  }, [cancelSubClose]);

  // Reset the highlight when the panel opens, not when it closes: removing
  // the layoutId highlight while the panel is still animating out leaves
  // motion waiting on it forever, so the closed panel never unmounts.
  useEffect(() => {
    if (open) {
      setActiveId(null);
      return;
    }
    cancelSubClose();
    setOpenSubState(null);
  }, [open, cancelSubClose]);

  useEffect(() => cancelSubClose, [cancelSubClose]);

  return useMemo(
    () => ({
      activeId,
      setActiveId,
      openSub,
      setOpenSub,
      scheduleSubClose,
      cancelSubClose,
    }),
    [activeId, openSub, setOpenSub, scheduleSubClose, cancelSubClose],
  );
}

function getItems(container: HTMLElement | null) {
  if (!container) return [];
  return Array.from(
    container.querySelectorAll<HTMLElement>(
      '[data-dropdown-menu-item]:not([data-disabled="true"])',
    ),
  );
}

function focusByIntent(container: HTMLElement | null, intent: FocusIntent) {
  if (!container || intent === "none") return;
  const items = getItems(container);
  const target =
    intent === "first"
      ? items[0]
      : intent === "last"
        ? items[items.length - 1]
        : container;
  (target ?? container).focus({ preventScroll: true });
}

function assignRef<T>(ref: Ref<T> | undefined, value: T | null) {
  if (typeof ref === "function") ref(value);
  else if (ref) (ref as MutableRefObject<T | null>).current = value;
}

/* -------------------------------------------------------------------------- */
/*                                    Root                                    */
/* -------------------------------------------------------------------------- */

export interface DropdownMenuProps {
  children: ReactNode;
  /** Controlled open state. */
  open?: boolean;
  /** Uncontrolled initial open state. */
  defaultOpen?: boolean;
  onOpenChange?: (open: boolean) => void;
  className?: string;
}

/**
 * Composable dropdown menu following the WAI-ARIA menu button pattern. The
 * panel scales out of the trigger side, an active-row highlight glides
 * between items, and submenus open on hover intent or ArrowRight.
 */
export function DropdownMenu({
  children,
  open: controlledOpen,
  defaultOpen = false,
  onOpenChange,
  className,
}: DropdownMenuProps) {
  const [internalOpen, setInternalOpen] = useState(defaultOpen);
  const controlled = controlledOpen !== undefined;
  const open = controlled ? controlledOpen : internalOpen;
  const baseId = useId();
  const triggerRef = useRef<HTMLElement | null>(null);
  const contentRef = useRef<HTMLDivElement | null>(null);
  const focusIntent = useRef<FocusIntent>("content");
  const reduce = useReducedMotion() ?? false;
  const core = useLevelCore(open);

  const setOpen = useCallback(
    (next: boolean) => {
      if (!controlled) setInternalOpen(next);
      onOpenChange?.(next);
    },
    [controlled, onOpenChange],
  );

  const closeAll = useCallback(
    (restoreFocus: boolean) => {
      setOpen(false);
      if (restoreFocus) triggerRef.current?.focus({ preventScroll: true });
    },
    [setOpen],
  );

  const dismiss = useCallback(() => setOpen(false), [setOpen]);
  const openRoot = useCallback(() => setOpen(true), [setOpen]);
  const insideTree = useCallback(
    (target: Element) =>
      Boolean(target.closest(`[data-dropdown-menu="${baseId}"]`)),
    [baseId],
  );
  // Escape is handled by the focused panel, which knows whether it is a
  // submenu (close one level) or the root (close and refocus the trigger).
  useDismiss(open, dismiss, null, { escape: false, ignore: insideTree });

  // Focus moves into the panel on open: the first/last item for keyboard
  // opens, the panel itself for pointer opens so arrows work immediately.
  useEffect(() => {
    if (!open) return;
    const frame = requestAnimationFrame(() =>
      focusByIntent(contentRef.current, focusIntent.current),
    );
    return () => cancelAnimationFrame(frame);
  }, [open]);

  const level = useMemo<MenuLevel>(
    () => ({
      rootId: baseId,
      levelId: `${baseId}-root`,
      open,
      isSub: false,
      triggerId: `${baseId}-trigger`,
      contentId: `${baseId}-content`,
      triggerRef,
      contentRef,
      focusIntent,
      ...core,
      close: closeAll,
      closeAll,
      openRoot,
      reduce,
    }),
    [baseId, open, core, closeAll, openRoot, reduce],
  );

  return (
    <MenuLevelContext.Provider value={level}>
      <div className={cn("relative inline-flex", className)}>{children}</div>
    </MenuLevelContext.Provider>
  );
}

/* -------------------------------------------------------------------------- */
/*                                  Trigger                                   */
/* -------------------------------------------------------------------------- */

type TriggerChildProps = React.HTMLAttributes<HTMLElement> & {
  ref?: Ref<HTMLElement>;
  [key: `data-${string}`]: string | undefined;
};

export interface DropdownMenuTriggerProps {
  /** A single element, normally a `<button>`. Its own handlers still run. */
  children: ReactElement<TriggerChildProps>;
  className?: string;
}

export function DropdownMenuTrigger({
  children,
  className,
}: DropdownMenuTriggerProps) {
  const level = useMenuLevel("DropdownMenuTrigger");
  if (!isValidElement(children)) {
    throw new Error("<DropdownMenuTrigger> requires a single React element");
  }
  const childProps = children.props;
  const childRef = childProps.ref;

  const openWith = (intent: FocusIntent) => {
    level.focusIntent.current = intent;
    if (!level.open) {
      level.openRoot();
    } else {
      focusByIntent(level.contentRef.current, intent);
    }
  };

  return cloneElement(children, {
    ref: (node: HTMLElement | null) => {
      level.triggerRef.current = node;
      assignRef(childRef, node);
    },
    id: level.triggerId,
    "aria-haspopup": "menu",
    "aria-expanded": level.open,
    "aria-controls": level.open ? level.contentId : undefined,
    "data-state": level.open ? "open" : "closed",
    "data-dropdown-menu": level.rootId,
    className: cn(childProps.className, className),
    onClick: (event: ReactMouseEvent<HTMLElement>) => {
      childProps.onClick?.(event);
      if (event.defaultPrevented) return;
      if (level.open) {
        level.closeAll(false);
        return;
      }
      // `detail` is 0 for a click synthesized by the keyboard.
      openWith(event.detail === 0 ? "first" : "content");
    },
    onKeyDown: (event: ReactKeyboardEvent<HTMLElement>) => {
      childProps.onKeyDown?.(event);
      if (event.defaultPrevented) return;
      if (
        event.key === "ArrowDown" ||
        event.key === "Enter" ||
        event.key === " "
      ) {
        event.preventDefault();
        openWith("first");
      } else if (event.key === "ArrowUp") {
        event.preventDefault();
        openWith("last");
      }
    },
  });
}

/* -------------------------------------------------------------------------- */
/*                                   Panel                                    */
/* -------------------------------------------------------------------------- */

interface MenuPanelProps {
  level: MenuLevel;
  children: ReactNode;
  side: PlacementSide;
  align: PlacementAlign;
  sideOffset: number;
  alignOffset: number;
  className?: string;
  ariaLabel?: string;
  onPanelEnter?: () => void;
}

function MenuPanel({
  level,
  children,
  side,
  align,
  sideOffset,
  alignOffset,
  className,
  ariaLabel,
  onPanelEnter,
}: MenuPanelProps) {
  const [portalReady, setPortalReady] = useState(false);
  const typeahead = useRef("");
  const typeaheadTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const layout = usePopoverPortalPosition(
    level.triggerRef,
    level.contentRef,
    portalReady && level.open,
  );

  useEffect(() => setPortalReady(true), []);
  useEffect(
    () => () => {
      if (typeaheadTimer.current) clearTimeout(typeaheadTimer.current);
    },
    [],
  );

  const moveFocus = (direction: 1 | -1) => {
    const items = getItems(level.contentRef.current);
    if (items.length === 0) return;
    const current = items.indexOf(document.activeElement as HTMLElement);
    const next =
      current < 0
        ? direction === 1
          ? 0
          : items.length - 1
        : (current + direction + items.length) % items.length;
    items[next]?.focus();
  };

  const onKeyDown = (event: ReactKeyboardEvent<HTMLDivElement>) => {
    // React bubbles events through portals: a submenu's keys would reach its
    // parent panel too. Only answer keys pressed inside this panel's DOM.
    if (!event.currentTarget.contains(event.target as Node)) return;
    if (event.defaultPrevented) return;
    const { key } = event;

    if (key === "Escape") {
      event.preventDefault();
      level.close(true);
      return;
    }
    if (key === "ArrowLeft" && level.isSub) {
      event.preventDefault();
      level.close(true);
      return;
    }
    if (key === "Tab") {
      event.preventDefault();
      level.closeAll(true);
      return;
    }
    if (key === "ArrowDown" || key === "ArrowUp") {
      event.preventDefault();
      moveFocus(key === "ArrowDown" ? 1 : -1);
      return;
    }
    if (key === "Home" || key === "End") {
      event.preventDefault();
      const items = getItems(level.contentRef.current);
      items[key === "Home" ? 0 : items.length - 1]?.focus();
      return;
    }
    const printable =
      key.length === 1 && !event.ctrlKey && !event.metaKey && !event.altKey;
    // A leading space is activation, not a search character.
    if (!printable || (key === " " && typeahead.current === "")) return;
    event.preventDefault();
    typeahead.current += key.toLocaleLowerCase();
    if (typeaheadTimer.current) clearTimeout(typeaheadTimer.current);
    typeaheadTimer.current = setTimeout(() => {
      typeahead.current = "";
    }, TYPEAHEAD_RESET);
    const items = getItems(level.contentRef.current);
    const start = items.indexOf(document.activeElement as HTMLElement);
    // Search from the row after the current one so repeating a letter cycles.
    const ordered =
      typeahead.current.length === 1 && start >= 0
        ? [...items.slice(start + 1), ...items.slice(0, start + 1)]
        : items;
    const match = ordered.find((item) =>
      (item.dataset.label ?? item.textContent ?? "")
        .trim()
        .toLocaleLowerCase()
        .startsWith(typeahead.current),
    );
    match?.focus();
  };

  if (!portalReady) return null;

  const placement = layout
    ? resolvePlacement(layout, { side, align, sideOffset, alignOffset })
    : null;

  return createPortal(
    <AnimatePresence>
      {level.open ? (
        <motion.div
          ref={level.contentRef}
          id={level.contentId}
          role="menu"
          aria-label={ariaLabel}
          aria-labelledby={ariaLabel ? undefined : level.triggerId}
          aria-orientation="vertical"
          tabIndex={-1}
          data-dropdown-menu={level.rootId}
          data-side={placement?.side ?? side}
          initial={level.reduce ? { opacity: 0 } : { opacity: 0, scale: 0.94 }}
          animate={{ opacity: 1, scale: 1 }}
          // pointerEvents flips at the start of the exit, so a closing panel
          // can never be hovered or clicked through.
          exit={
            level.reduce
              ? { opacity: 0, pointerEvents: "none", transition: { duration: 0.1 } }
              : {
                  opacity: 0,
                  scale: 0.96,
                  pointerEvents: "none",
                  transition: { duration: 0.12, ease: EASE_OUT },
                }
          }
          transition={
            level.reduce
              ? { duration: 0.12, ease: EASE_OUT }
              : { ...SPRING_PANEL, opacity: { duration: 0.16, ease: EASE_OUT } }
          }
          style={{
            left: placement?.left ?? 0,
            top: placement?.top ?? 0,
            // The panel grows out of the trigger's side — transform-origin on
            // an HTML element is safe for motion's scale.
            transformOrigin: placement?.origin ?? "50% 0%",
            visibility: placement ? "visible" : "hidden",
          }}
          onKeyDown={onKeyDown}
          onFocus={(event: ReactFocusEvent<HTMLDivElement>) => {
            if (event.target === event.currentTarget) level.setActiveId(null);
            else onPanelEnter?.();
          }}
          onPointerEnter={onPanelEnter}
          className={cn(
            "fixed z-[100] min-w-52 rounded-xl border border-border bg-card p-1.5 text-foreground shadow-[0_18px_40px_-12px_rgba(0,0,0,0.28)] outline-none",
            className,
          )}
        >
          {children}
        </motion.div>
      ) : null}
    </AnimatePresence>,
    document.body,
  );
}

export interface DropdownMenuContentProps {
  children: ReactNode;
  /** Preferred side; flips when the viewport lacks room. Default "bottom". */
  side?: "bottom" | "top";
  /** Alignment against the trigger. Default "start". */
  align?: PlacementAlign;
  /** Gap between trigger and panel, in px. Default 6. */
  sideOffset?: number;
  alignOffset?: number;
  /** Accessible name; defaults to the trigger's text via aria-labelledby. */
  ariaLabel?: string;
  className?: string;
}

export function DropdownMenuContent({
  children,
  side = "bottom",
  align = "start",
  sideOffset = 6,
  alignOffset = 0,
  ariaLabel,
  className,
}: DropdownMenuContentProps) {
  const level = useMenuLevel("DropdownMenuContent");
  return (
    <MenuPanel
      level={level}
      side={side}
      align={align}
      sideOffset={sideOffset}
      alignOffset={alignOffset}
      ariaLabel={ariaLabel}
      className={className}
    >
      {children}
    </MenuPanel>
  );
}

/* -------------------------------------------------------------------------- */
/*                                   Items                                    */
/* -------------------------------------------------------------------------- */

type ItemVariant = "default" | "destructive";

interface ItemBaseProps {
  children: ReactNode;
  itemId?: string;
  role?: "menuitem" | "menuitemcheckbox" | "menuitemradio";
  ariaChecked?: boolean;
  disabled?: boolean;
  variant?: ItemVariant;
  inset?: boolean;
  textValue?: string;
  className?: string;
  closeOnSelect: boolean;
  onActivate?: (event: ReactMouseEvent<HTMLButtonElement>) => void;
  isSubTrigger?: boolean;
  extraProps?: React.ButtonHTMLAttributes<HTMLButtonElement> & {
    ref?: Ref<HTMLButtonElement>;
    [key: `data-${string}`]: string | undefined;
  };
}

function ItemBase({
  children,
  itemId,
  role = "menuitem",
  ariaChecked,
  disabled = false,
  variant = "default",
  inset = false,
  textValue,
  className,
  closeOnSelect,
  onActivate,
  isSubTrigger = false,
  extraProps,
}: ItemBaseProps) {
  const level = useMenuLevel("DropdownMenuItem");
  const autoId = useId();
  const id = itemId ?? autoId;
  const highlighted = level.activeId === id;
  const checkedProps =
    role === "menuitem" ? {} : { "aria-checked": ariaChecked ?? false };
  const { onPointerEnter, onPointerLeave, onKeyDown, ref, ...rest } =
    extraProps ?? {};

  return (
    <button
      {...rest}
      ref={ref}
      type="button"
      id={id}
      role={role}
      {...checkedProps}
      disabled={disabled}
      tabIndex={-1}
      data-dropdown-menu-item=""
      data-disabled={disabled ? "true" : undefined}
      data-highlighted={highlighted ? "" : undefined}
      data-label={textValue}
      onFocus={() => level.setActiveId(id)}
      onPointerEnter={(event: ReactPointerEvent<HTMLButtonElement>) => {
        onPointerEnter?.(event);
        if (!isSubTrigger && event.pointerType !== "touch") {
          level.scheduleSubClose();
        }
      }}
      onPointerMove={(event: ReactPointerEvent<HTMLButtonElement>) => {
        if (disabled || event.pointerType === "touch") return;
        if (document.activeElement !== event.currentTarget) {
          event.currentTarget.focus({ preventScroll: true });
        }
      }}
      onPointerLeave={(event: ReactPointerEvent<HTMLButtonElement>) => {
        onPointerLeave?.(event);
        if (event.pointerType === "touch" || isSubTrigger) return;
        // Clearing focus to the panel drops the highlight when the pointer
        // leaves the rows, the way native menus behave.
        if (document.activeElement === event.currentTarget) {
          level.contentRef.current?.focus({ preventScroll: true });
        }
      }}
      onKeyDown={onKeyDown}
      onClick={(event) => {
        if (disabled) return;
        onActivate?.(event);
        if (closeOnSelect && !event.defaultPrevented) level.closeAll(true);
      }}
      className={cn(
        "relative isolate flex w-full select-none items-center gap-2.5 rounded-lg px-2.5 py-1.5 text-left text-[13px] outline-none",
        "disabled:pointer-events-none disabled:opacity-40",
        "[&_svg]:size-4 [&_svg]:shrink-0",
        inset && "pl-8",
        variant === "destructive"
          ? "text-destructive [&_svg]:text-destructive"
          : "text-foreground [&_svg]:text-muted-foreground",
        className,
      )}
    >
      {/* Its own presence boundary: a layoutId element registers with the
          nearest AnimatePresence, and the panel's exit would otherwise wait
          on the highlight's layout animation and never unmount. */}
      <AnimatePresence initial={false}>
        {highlighted ? (
          <motion.span
            aria-hidden="true"
            layoutId={`${level.levelId}-highlight`}
            className={cn(
              "absolute inset-0 -z-10 rounded-lg",
              variant === "destructive"
                ? "bg-destructive/10"
                : "bg-foreground/[0.07]",
            )}
            transition={level.reduce ? { duration: 0 } : SPRING_LAYOUT}
          />
        ) : null}
      </AnimatePresence>
      {children}
    </button>
  );
}

function Shortcut({ children }: { children: ReactNode }) {
  return (
    <span
      aria-hidden="true"
      className="ml-auto pl-4 font-mono text-[11px] tracking-wide text-muted-foreground"
    >
      {children}
    </span>
  );
}

export interface DropdownMenuItemProps {
  children: ReactNode;
  /** Leading icon (sized to 16px). */
  icon?: ReactNode;
  /** Trailing shortcut hint, e.g. "⌘K" or a `KbdCombo`. Decorative. */
  shortcut?: ReactNode;
  variant?: ItemVariant;
  disabled?: boolean;
  /** Indent to line up with checkbox/radio rows. */
  inset?: boolean;
  /** Text used by typeahead when children aren't plain text. */
  textValue?: string;
  /** Call `event.preventDefault()` to keep the menu open. */
  onSelect?: (event: ReactMouseEvent<HTMLButtonElement>) => void;
  /** Default true. */
  closeOnSelect?: boolean;
  className?: string;
}

export function DropdownMenuItem({
  children,
  icon,
  shortcut,
  onSelect,
  closeOnSelect = true,
  ...props
}: DropdownMenuItemProps) {
  return (
    <ItemBase {...props} closeOnSelect={closeOnSelect} onActivate={onSelect}>
      {icon}
      <span className="min-w-0 flex-1 truncate">{children}</span>
      {shortcut ? <Shortcut>{shortcut}</Shortcut> : null}
    </ItemBase>
  );
}

function Indicator({
  checked,
  kind,
  reduce,
}: {
  checked: boolean;
  kind: "check" | "dot";
  reduce: boolean;
}) {
  return (
    <span
      aria-hidden="true"
      className="absolute left-2.5 flex size-4 items-center justify-center"
    >
      <AnimatePresence initial={false}>
        {checked ? (
          <motion.span
            key={kind}
            initial={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.6 }}
            animate={{ opacity: 1, scale: 1 }}
            exit={reduce ? { opacity: 0 } : { opacity: 0, scale: 0.6 }}
            transition={reduce ? { duration: 0.08 } : SPRING_PANEL}
            className="flex items-center justify-center text-foreground"
          >
            {kind === "check" ? (
              <Check className="size-3.5! text-foreground!" strokeWidth={2.6} />
            ) : (
              <span className="size-1.5 rounded-full bg-current" />
            )}
          </motion.span>
        ) : null}
      </AnimatePresence>
    </span>
  );
}

export interface DropdownMenuCheckboxItemProps
  extends Omit<DropdownMenuItemProps, "onSelect" | "inset" | "icon"> {
  checked?: boolean;
  defaultChecked?: boolean;
  onCheckedChange?: (checked: boolean) => void;
}

/** A toggle row. Stays open on select by default so several can be flipped. */
export function DropdownMenuCheckboxItem({
  children,
  checked: controlledChecked,
  defaultChecked = false,
  onCheckedChange,
  shortcut,
  closeOnSelect = false,
  ...props
}: DropdownMenuCheckboxItemProps) {
  const level = useMenuLevel("DropdownMenuCheckboxItem");
  const [internal, setInternal] = useState(defaultChecked);
  const checked = controlledChecked ?? internal;
  return (
    <ItemBase
      {...props}
      inset
      role="menuitemcheckbox"
      ariaChecked={checked}
      closeOnSelect={closeOnSelect}
      onActivate={() => {
        if (controlledChecked === undefined) setInternal(!checked);
        onCheckedChange?.(!checked);
      }}
    >
      <Indicator checked={checked} kind="check" reduce={level.reduce} />
      <span className="min-w-0 flex-1 truncate">{children}</span>
      {shortcut ? <Shortcut>{shortcut}</Shortcut> : null}
    </ItemBase>
  );
}

interface RadioGroupContextValue {
  value: string | undefined;
  select: (value: string) => void;
}

const RadioGroupContext = createContext<RadioGroupContextValue | null>(null);

export interface DropdownMenuRadioGroupProps {
  children: ReactNode;
  value?: string;
  defaultValue?: string;
  onValueChange?: (value: string) => void;
  /** Accessible name for the group. */
  ariaLabel?: string;
  className?: string;
}

export function DropdownMenuRadioGroup({
  children,
  value: controlledValue,
  defaultValue,
  onValueChange,
  ariaLabel,
  className,
}: DropdownMenuRadioGroupProps) {
  const [internal, setInternal] = useState(defaultValue);
  const value = controlledValue ?? internal;
  const ctx = useMemo<RadioGroupContextValue>(
    () => ({
      value,
      select: (next) => {
        if (controlledValue === undefined) setInternal(next);
        onValueChange?.(next);
      },
    }),
    [value, controlledValue, onValueChange],
  );
  return (
    <RadioGroupContext.Provider value={ctx}>
      <fieldset
        aria-label={ariaLabel}
        className={cn("m-0 min-w-0 border-0 p-0", className)}
      >
        {children}
      </fieldset>
    </RadioGroupContext.Provider>
  );
}

export interface DropdownMenuRadioItemProps
  extends Omit<DropdownMenuItemProps, "onSelect" | "inset" | "icon"> {
  value: string;
}

export function DropdownMenuRadioItem({
  children,
  value,
  shortcut,
  closeOnSelect = false,
  ...props
}: DropdownMenuRadioItemProps) {
  const level = useMenuLevel("DropdownMenuRadioItem");
  const group = useContext(RadioGroupContext);
  if (!group) {
    throw new Error(
      "DropdownMenuRadioItem must be used within <DropdownMenuRadioGroup>",
    );
  }
  const checked = group.value === value;
  return (
    <ItemBase
      {...props}
      inset
      role="menuitemradio"
      ariaChecked={checked}
      closeOnSelect={closeOnSelect}
      onActivate={() => group.select(value)}
    >
      <Indicator checked={checked} kind="dot" reduce={level.reduce} />
      <span className="min-w-0 flex-1 truncate">{children}</span>
      {shortcut ? <Shortcut>{shortcut}</Shortcut> : null}
    </ItemBase>
  );
}

export interface DropdownMenuLabelProps {
  children: ReactNode;
  inset?: boolean;
  className?: string;
}

export function DropdownMenuLabel({
  children,
  inset = false,
  className,
}: DropdownMenuLabelProps) {
  return (
    <div
      className={cn(
        "px-2.5 pb-1 pt-1.5 text-[11px] font-medium text-muted-foreground",
        inset && "pl-8",
        className,
      )}
    >
      {children}
    </div>
  );
}

export interface DropdownMenuGroupProps {
  children: ReactNode;
  ariaLabel?: string;
  className?: string;
}

export function DropdownMenuGroup({
  children,
  ariaLabel,
  className,
}: DropdownMenuGroupProps) {
  return (
    <fieldset
        aria-label={ariaLabel}
        className={cn("m-0 min-w-0 border-0 p-0", className)}
      >
      {children}
    </fieldset>
  );
}

export function DropdownMenuSeparator({ className }: { className?: string }) {
  return <hr className={cn("-mx-1.5 my-1.5 h-px border-0 bg-border", className)} />;
}

/* -------------------------------------------------------------------------- */
/*                                  Submenus                                  */
/* -------------------------------------------------------------------------- */

interface SubContextValue {
  level: MenuLevel;
  parent: MenuLevel;
  triggerItemId: string;
  openTimer: MutableRefObject<ReturnType<typeof setTimeout> | null>;
  openWith: (intent: FocusIntent) => void;
}

const SubContext = createContext<SubContextValue | null>(null);

function useSub(component: string) {
  const sub = useContext(SubContext);
  if (!sub) throw new Error(`${component} must be used within <DropdownMenuSub>`);
  return sub;
}

export interface DropdownMenuSubProps {
  children: ReactNode;
}

/** A nested menu opened from a `DropdownMenuSubTrigger` row. */
export function DropdownMenuSub({ children }: DropdownMenuSubProps) {
  const parent = useMenuLevel("DropdownMenuSub");
  const subId = useId();
  const open = parent.open && parent.openSub === subId;
  const triggerRef = useRef<HTMLElement | null>(null);
  const contentRef = useRef<HTMLDivElement | null>(null);
  const focusIntent = useRef<FocusIntent>("none");
  const openTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const core = useLevelCore(open);
  const triggerItemId = `${subId}-trigger`;

  useEffect(
    () => () => {
      if (openTimer.current) clearTimeout(openTimer.current);
    },
    [],
  );

  // Open submenus take focus only when asked to (keyboard); a hover open
  // leaves it on the trigger row.
  useEffect(() => {
    if (!open) return;
    const frame = requestAnimationFrame(() =>
      focusByIntent(contentRef.current, focusIntent.current),
    );
    return () => cancelAnimationFrame(frame);
  }, [open]);

  const { setOpenSub } = parent;
  const close = useCallback(
    (restoreFocus: boolean) => {
      setOpenSub(null);
      if (restoreFocus) triggerRef.current?.focus({ preventScroll: true });
    },
    [setOpenSub],
  );

  const openWith = useCallback(
    (intent: FocusIntent) => {
      if (openTimer.current) clearTimeout(openTimer.current);
      openTimer.current = null;
      focusIntent.current = intent;
      if (open) focusByIntent(contentRef.current, intent);
      else setOpenSub(subId);
    },
    [open, setOpenSub, subId],
  );

  const level = useMemo<MenuLevel>(
    () => ({
      rootId: parent.rootId,
      levelId: `${subId}-level`,
      open,
      isSub: true,
      triggerId: triggerItemId,
      contentId: `${subId}-content`,
      triggerRef,
      contentRef,
      focusIntent,
      ...core,
      close,
      closeAll: parent.closeAll,
      openRoot: parent.openRoot,
      reduce: parent.reduce,
    }),
    [
      parent.rootId,
      parent.closeAll,
      parent.openRoot,
      parent.reduce,
      subId,
      open,
      triggerItemId,
      core,
      close,
    ],
  );

  const ctx = useMemo<SubContextValue>(
    () => ({ level, parent, triggerItemId, openTimer, openWith }),
    [level, parent, triggerItemId, openWith],
  );

  return <SubContext.Provider value={ctx}>{children}</SubContext.Provider>;
}

export interface DropdownMenuSubTriggerProps {
  children: ReactNode;
  icon?: ReactNode;
  disabled?: boolean;
  inset?: boolean;
  textValue?: string;
  className?: string;
}

export function DropdownMenuSubTrigger({
  children,
  icon,
  ...props
}: DropdownMenuSubTriggerProps) {
  const { level, parent, triggerItemId, openTimer, openWith } = useSub(
    "DropdownMenuSubTrigger",
  );

  const clearOpenTimer = () => {
    if (openTimer.current) clearTimeout(openTimer.current);
    openTimer.current = null;
  };

  return (
    <ItemBase
      {...props}
      itemId={triggerItemId}
      isSubTrigger
      closeOnSelect={false}
      onActivate={(event) => openWith(event.detail === 0 ? "first" : "none")}
      extraProps={{
        ref: (node: HTMLButtonElement | null) => {
          level.triggerRef.current = node;
        },
        "aria-haspopup": "menu",
        "aria-expanded": level.open,
        "aria-controls": level.open ? level.contentId : undefined,
        "data-state": level.open ? "open" : "closed",
        onPointerEnter: (event) => {
          if (event.pointerType === "touch" || props.disabled) return;
          parent.cancelSubClose();
          if (level.open) return;
          clearOpenTimer();
          openTimer.current = setTimeout(() => {
            openTimer.current = null;
            openWith("none");
          }, SUB_OPEN_DELAY);
        },
        onPointerLeave: (event) => {
          if (event.pointerType === "touch") return;
          clearOpenTimer();
          parent.scheduleSubClose();
        },
        onKeyDown: (event) => {
          if (event.key === "ArrowRight") {
            event.preventDefault();
            openWith("first");
          }
        },
      }}
    >
      {icon}
      <span className="min-w-0 flex-1 truncate">{children}</span>
      <ChevronRight
        aria-hidden="true"
        className="-mr-1 ml-auto size-3.5! text-muted-foreground"
      />
    </ItemBase>
  );
}

export interface DropdownMenuSubContentProps {
  children: ReactNode;
  /** Preferred side; flips when the viewport lacks room. Default "right". */
  side?: "right" | "left";
  /** Gap from the parent panel, in px. Default 8. */
  sideOffset?: number;
  /** Shift so the first row lines up with the trigger row. Default -7. */
  alignOffset?: number;
  ariaLabel?: string;
  className?: string;
}

export function DropdownMenuSubContent({
  children,
  side = "right",
  sideOffset = 8,
  alignOffset = -7,
  ariaLabel,
  className,
}: DropdownMenuSubContentProps) {
  const { level, parent, triggerItemId } = useSub("DropdownMenuSubContent");
  const { cancelSubClose, setActiveId } = parent;
  // While the pointer or focus is in the submenu, its trigger row keeps the
  // parent's highlight and the pending close is called off.
  const onPanelEnter = useCallback(() => {
    cancelSubClose();
    setActiveId(triggerItemId);
  }, [cancelSubClose, setActiveId, triggerItemId]);

  return (
    <MenuLevelContext.Provider value={level}>
      <MenuPanel
        level={level}
        side={side}
        align="start"
        sideOffset={sideOffset}
        alignOffset={alignOffset}
        ariaLabel={ariaLabel}
        className={cn("min-w-44", className)}
        onPanelEnter={onPanelEnter}
      >
        {children}
      </MenuPanel>
    </MenuLevelContext.Provider>
  );
}