Inline Edit

// 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))
}

// 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";
// karaui.kamisama-v0.my.id/components/motion/inline-edit

import {
  AnimatePresence,
  animate,
  motion,
  useReducedMotion,
} from "motion/react";
import {
  useCallback,
  useEffect,
  useId,
  useRef,
  useState,
  type KeyboardEvent,
} from "react";
import { Loader } from "@/components/motion/loader";
import { EASE_OUT, SPRING_PRESS, SPRING_SWAP } from "@/lib/ease";
import { cn } from "@/lib/utils";

export type InlineEditClassNames = {
  root?: string;
  display?: string;
  input?: string;
  placeholder?: string;
  errorMessage?: string;
};

export interface InlineEditProps {
  /** Accessible name of the field ("Name", "Bio"); also used in the edit hint. */
  label: string;
  value?: string;
  defaultValue?: string;
  /**
   * Commit handler. Return a promise to show a pending spinner; the shown value
   * rolls back (with a shake and the rejection message) if it rejects.
   * Controlled callers update `value` here.
   */
  onSave?: (next: string) => unknown;
  onCancel?: () => void;
  onEditingChange?: (editing: boolean) => void;
  /** Return an error message to block the save and keep the editor open. */
  validate?: (next: string) => string | null | undefined | false;
  /** Edit in an auto-growing textarea; Enter saves, Shift+Enter adds a line. */
  multiline?: boolean;
  placeholder?: string;
  maxLength?: number;
  /** Select the whole text when the editor opens (default) or put the caret at the end. */
  selectOnEdit?: boolean;
  disabled?: boolean;
  className?: string;
  classNames?: InlineEditClassNames;
}

type Status = "idle" | "pending" | "saved";

const SHAKE = { x: [0, -6, 6, -4, 4, -2, 0] };
const SAVED_FLASH_MS = 1400;

function messageOf(reason: unknown) {
  if (reason instanceof Error && reason.message) return reason.message;
  if (typeof reason === "string" && reason) return reason;
  return "Couldn't save. Try again.";
}

function isThenable(value: unknown): value is PromiseLike<unknown> {
  return (
    typeof value === "object" &&
    value !== null &&
    typeof (value as PromiseLike<unknown>).then === "function"
  );
}

export function InlineEdit({
  label,
  value: valueProp,
  defaultValue,
  onSave,
  onCancel,
  onEditingChange,
  validate,
  multiline = false,
  placeholder = "Empty",
  maxLength,
  selectOnEdit = true,
  disabled,
  className,
  classNames,
}: InlineEditProps) {
  const id = useId();
  const reduce = useReducedMotion();

  const controlled = valueProp !== undefined;
  const [internal, setInternal] = useState(defaultValue ?? "");
  const value = controlled ? (valueProp ?? "") : internal;

  const [editing, setEditing] = useState(false);
  const [draft, setDraft] = useState(value);
  const [status, setStatus] = useState<Status>("idle");
  const [pendingValue, setPendingValue] = useState("");
  const [error, setError] = useState<string | null>(null);

  // Refs gate commit/cancel so the blur fired while the editor unmounts can't
  // save a second time.
  const editingRef = useRef(false);
  const restoreFocusRef = useRef(false);
  const saveIdRef = useRef(0);
  const flashTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const mountedRef = useRef(true);

  const boxRef = useRef<HTMLDivElement>(null);
  const displayRef = useRef<HTMLButtonElement>(null);
  const fieldRef = useRef<HTMLInputElement & HTMLTextAreaElement>(null);

  useEffect(() => {
    mountedRef.current = true;
    return () => {
      mountedRef.current = false;
      if (flashTimer.current) clearTimeout(flashTimer.current);
    };
  }, []);

  const shake = useCallback(() => {
    if (!boxRef.current || reduce) return;
    animate(boxRef.current, SHAKE, { duration: 0.45 });
  }, [reduce]);

  const setEditingState = (next: boolean) => {
    editingRef.current = next;
    setEditing(next);
    onEditingChange?.(next);
  };

  // Focus the editor as it opens; return focus to the text after a
  // keyboard commit or cancel (not after blur — that would steal focus).
  useEffect(() => {
    if (editing) {
      const field = fieldRef.current;
      if (!field) return;
      field.focus();
      if (selectOnEdit) field.select();
      else field.setSelectionRange(field.value.length, field.value.length);
    } else if (restoreFocusRef.current) {
      restoreFocusRef.current = false;
      displayRef.current?.focus();
    }
  }, [editing, selectOnEdit]);

  const startEditing = () => {
    if (disabled || editingRef.current || status === "pending") return;
    if (flashTimer.current) clearTimeout(flashTimer.current);
    setStatus("idle");
    setDraft(value);
    setError(null);
    setEditingState(true);
  };

  const cancel = () => {
    if (!editingRef.current) return;
    restoreFocusRef.current = true;
    setDraft(value);
    setError(null);
    setEditingState(false);
    onCancel?.();
  };

  const flashSaved = () => {
    setStatus("saved");
    if (flashTimer.current) clearTimeout(flashTimer.current);
    flashTimer.current = setTimeout(() => {
      if (mountedRef.current) setStatus("idle");
    }, SAVED_FLASH_MS);
  };

  const commit = (via: "key" | "blur") => {
    if (!editingRef.current) return;
    const next = draft;
    if (next === value) {
      if (via === "key") restoreFocusRef.current = true;
      setError(null);
      setEditingState(false);
      return;
    }
    const invalid = validate?.(next);
    if (invalid) {
      setError(invalid);
      shake();
      return;
    }

    if (via === "key") restoreFocusRef.current = true;
    setError(null);
    setEditingState(false);

    const result = onSave?.(next);
    if (!isThenable(result)) {
      if (!controlled) setInternal(next);
      flashSaved();
      return;
    }

    const saveId = ++saveIdRef.current;
    setPendingValue(next);
    setStatus("pending");
    Promise.resolve(result).then(
      () => {
        if (!mountedRef.current || saveId !== saveIdRef.current) return;
        if (!controlled) setInternal(next);
        flashSaved();
      },
      (reason: unknown) => {
        if (!mountedRef.current || saveId !== saveIdRef.current) return;
        setStatus("idle");
        setError(messageOf(reason));
        shake();
      },
    );
  };

  const onFieldKeyDown = (
    event: KeyboardEvent<HTMLInputElement | HTMLTextAreaElement>,
  ) => {
    if (event.nativeEvent.isComposing) return;
    if (event.key === "Escape") {
      event.preventDefault();
      event.stopPropagation();
      cancel();
    } else if (event.key === "Enter" && !(multiline && event.shiftKey)) {
      event.preventDefault();
      commit("key");
    }
  };

  const shown = status === "pending" ? pendingValue : value;
  const errorId = `${id}-error`;
  // Display and editor share this box model exactly, so swapping them never
  // moves the text. The -mx-2 hangs the padding outside so text aligns with
  // surrounding content.
  const textBox = cn(
    "w-full rounded-lg px-2 py-1 pr-8 text-left",
    multiline ? "whitespace-pre-wrap break-words" : "",
  );
  const iconSlot = cn(
    "pointer-events-none absolute right-2 z-10 flex size-4 items-center justify-center",
    multiline ? "top-[calc(0.25rem+0.5lh)] -translate-y-1/2" : "top-1/2 -translate-y-1/2",
  );

  const motionIn = reduce
    ? { opacity: 1 }
    : { opacity: 1, scale: 1 };
  const motionOut = reduce
    ? { opacity: 0 }
    : { opacity: 0, scale: 0.6 };

  return (
    <div
      data-state={editing ? "editing" : status}
      className={cn("relative -mx-2", className, classNames?.root)}
    >
      <div ref={boxRef} className="group relative">
        {/* Field surface: fades and settles in under the text while editing. */}
        <motion.span
          aria-hidden="true"
          className={cn(
            "pointer-events-none absolute inset-0 rounded-lg border bg-background ring-2",
            error
              ? "border-destructive ring-destructive/25"
              : "border-foreground/30 ring-ring/40",
          )}
          initial={false}
          animate={
            editing
              ? motionIn
              : reduce
                ? { opacity: 0 }
                : { opacity: 0, scale: 0.98 }
          }
          transition={{ duration: editing ? 0.2 : 0.12, ease: EASE_OUT }}
        />

        {editing ? (
          multiline ? (
            <div className="relative grid">
              <span
                aria-hidden="true"
                className={cn(
                  textBox,
                  "invisible [grid-area:1/1]",
                  classNames?.input,
                )}
              >
                {`${draft} `}
              </span>
              <textarea
                ref={fieldRef}
                aria-label={label}
                aria-invalid={error ? true : undefined}
                aria-describedby={error ? errorId : undefined}
                rows={1}
                value={draft}
                maxLength={maxLength}
                placeholder={placeholder}
                onChange={(e) => {
                  setDraft(e.target.value);
                  if (error) setError(null);
                }}
                onKeyDown={onFieldKeyDown}
                onBlur={() => commit("blur")}
                className={cn(
                  textBox,
                  "relative resize-none overflow-hidden bg-transparent text-foreground caret-foreground outline-none [grid-area:1/1] placeholder:text-muted-foreground/60",
                  classNames?.input,
                )}
              />
            </div>
          ) : (
            <input
              ref={fieldRef}
              aria-label={label}
              aria-invalid={error ? true : undefined}
              aria-describedby={error ? errorId : undefined}
              value={draft}
              maxLength={maxLength}
              placeholder={placeholder}
              onChange={(e) => {
                setDraft(e.target.value);
                if (error) setError(null);
              }}
              onKeyDown={onFieldKeyDown}
              onBlur={() => commit("blur")}
              className={cn(
                textBox,
                "relative block bg-transparent text-foreground caret-foreground outline-none placeholder:text-muted-foreground/60",
                classNames?.input,
              )}
            />
          )
        ) : (
          <button
            ref={displayRef}
            type="button"
            disabled={disabled}
            aria-describedby={error ? errorId : undefined}
            onClick={startEditing}
            onKeyDown={(event) => {
              if (event.key === "F2") {
                event.preventDefault();
                startEditing();
              }
            }}
            className={cn(
              textBox,
              "relative block cursor-text transition-[background-color,opacity] duration-150",
              "outline-none hover:bg-muted/70 focus-visible:ring-2 focus-visible:ring-ring/50",
              !multiline && "truncate",
              status === "pending" && "opacity-70",
              disabled && "cursor-not-allowed hover:bg-transparent",
              classNames?.display,
            )}
          >
            {shown ? (
              shown
            ) : (
              <span
                className={cn(
                  "text-muted-foreground/70 italic",
                  classNames?.placeholder,
                )}
              >
                {placeholder}
              </span>
            )}
            <span className="sr-only">, edit {label}</span>
          </button>
        )}

        <span className={iconSlot}>
          <AnimatePresence initial={false} mode="popLayout">
            {status === "pending" ? (
              <motion.span
                key="pending"
                className="flex"
                initial={motionOut}
                animate={motionIn}
                exit={motionOut}
                transition={SPRING_SWAP}
              >
                <Loader
                  variant="spinner"
                  size={14}
                  label="Saving"
                  className="text-muted-foreground"
                />
              </motion.span>
            ) : status === "saved" ? (
              <motion.span
                key="saved"
                className="flex size-4 items-center justify-center rounded-full bg-success text-background"
                initial={motionOut}
                animate={motionIn}
                exit={{ opacity: 0 }}
                transition={SPRING_PRESS}
              >
                <svg viewBox="0 0 24 24" fill="none" className="size-3" aria-hidden="true">
                  <motion.path
                    d="M5 12.5l4.5 4.5L19 7.5"
                    stroke="currentColor"
                    strokeWidth={3}
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    initial={reduce ? { pathLength: 1 } : { pathLength: 0 }}
                    animate={{ pathLength: 1 }}
                    transition={{ duration: 0.3, ease: EASE_OUT, delay: 0.05 }}
                  />
                </svg>
              </motion.span>
            ) : !editing && !disabled ? (
              <motion.span
                key="pencil"
                className="flex text-muted-foreground"
                initial={{ opacity: 0 }}
                animate={{ opacity: 1 }}
                exit={{ opacity: 0 }}
                transition={{ duration: 0.15 }}
              >
                <span className="flex opacity-0 transition-opacity duration-150 group-hover:opacity-100 group-has-[:focus-visible]:opacity-100">
                  <svg
                    viewBox="0 0 24 24"
                    fill="none"
                    stroke="currentColor"
                    strokeWidth={2}
                    strokeLinecap="round"
                    strokeLinejoin="round"
                    className="size-3.5"
                    aria-hidden="true"
                  >
                    <path d="M12 20h9" />
                    <path d="M16.5 3.5a2.12 2.12 0 0 1 3 3L7 19l-4 1 1-4Z" />
                  </svg>
                </span>
              </motion.span>
            ) : null}
          </AnimatePresence>
        </span>
      </div>

      <span className="sr-only" aria-live="polite">
        {status === "pending" ? "Saving" : status === "saved" ? "Saved" : ""}
      </span>

      <AnimatePresence initial={false}>
        {error ? (
          <motion.p
            id={errorId}
            role="alert"
            initial={
              reduce
                ? { opacity: 0 }
                : { opacity: 0, y: -4, filter: "blur(4px)" }
            }
            animate={{ opacity: 1, y: 0, filter: "blur(0px)" }}
            exit={
              reduce
                ? { opacity: 0 }
                : { opacity: 0, y: -4, filter: "blur(4px)" }
            }
            transition={{ duration: 0.2 }}
            className={cn(
              "px-2 pt-1 text-xs text-destructive",
              classNames?.errorMessage,
            )}
          >
            {error}
          </motion.p>
        ) : null}
      </AnimatePresence>
    </div>
  );
}

"use client";

import { motion, useReducedMotion } from "motion/react";
import { useEffect, useId, useState } from "react";
import { EASE_IN_OUT } from "@/lib/ease";
import { cn } from "@/lib/utils";

export type LoaderVariant =
  | "spinner"
  | "dots"
  | "bars"
  | "dot-matrix"
  | "dither"
  | "ascii"
  | "ascii-line"
  | "ascii-braille"
  | "ascii-blocks"
  | "ascii-bounce"
  | "morph"
  | "comet"
  | "scramble"
  | "metaballs"
  | "newton"
  | "helix"
  | "percent";

// Terminal-style frame sets — the loaders CLI AI agents cycle through.
const ASCII_SETS: Record<string, string[]> = {
  ascii: ["⠋", "⠙", "⠹", "⠸", "⠼", "⠴", "⠦", "⠧", "⠇", "⠏"],
  "ascii-line": ["|", "/", "-", "\\"],
  "ascii-braille": ["⣾", "⣽", "⣻", "⢿", "⡿", "⣟", "⣯", "⣷"],
  "ascii-blocks": ["▁", "▂", "▃", "▄", "▅", "▆", "▇", "█", "▇", "▆", "▅", "▄", "▃", "▂"],
  "ascii-bounce": ["⠁", "⠂", "⠄", "⡀", "⢀", "⠠", "⠐", "⠈"],
};

export interface LoaderProps {
  /** Which animation to render. */
  variant?: LoaderVariant;
  /** Base square size in px. Everything scales from this. */
  size?: number;
  /** Seconds per animation cycle. */
  speed?: number;
  /** Accessible label announced to screen readers. */
  label?: string;
  className?: string;
}

// Reduced motion keeps a calm opacity pulse and drops every transform.
const REDUCED = {
  animate: { opacity: [1, 0.4, 1] },
  transition: { duration: 1.4, ease: EASE_IN_OUT, repeat: Infinity },
};

export function Loader({
  variant = "spinner",
  size = 32,
  speed = 1,
  label = "Loading",
  className,
}: LoaderProps) {
  const reduce = useReducedMotion() ?? false;

  return (
    <span
      role="status"
      aria-label={label}
      className={cn(
        "inline-flex items-center justify-center text-foreground",
        className,
      )}
    >
      {variant === "spinner" && <Spinner size={size} speed={speed} reduce={reduce} />}
      {variant === "dots" && <Dots size={size} speed={speed} reduce={reduce} />}
      {variant === "bars" && <Bars size={size} speed={speed} reduce={reduce} />}
      {variant === "dot-matrix" && (
        <DotMatrix size={size} speed={speed} reduce={reduce} />
      )}
      {variant === "dither" && <Dither size={size} speed={speed} reduce={reduce} />}
      {ASCII_SETS[variant] && (
        <Ascii frames={ASCII_SETS[variant]} size={size} speed={speed} reduce={reduce} />
      )}
      {variant === "morph" && <Morph size={size} speed={speed} reduce={reduce} />}
      {variant === "comet" && <Comet size={size} speed={speed} reduce={reduce} />}
      {variant === "scramble" && (
        <Scramble size={size} speed={speed} reduce={reduce} />
      )}
      {variant === "metaballs" && (
        <Metaballs size={size} speed={speed} reduce={reduce} />
      )}
      {variant === "newton" && <Newton size={size} speed={speed} reduce={reduce} />}
      {variant === "helix" && <Helix size={size} speed={speed} reduce={reduce} />}
      {variant === "percent" && (
        <Percent size={size} speed={speed} reduce={reduce} />
      )}
      <span className="sr-only">{label}</span>
    </span>
  );
}

interface PartProps {
  size: number;
  speed: number;
  reduce: boolean;
}

function Spinner({ size, speed, reduce }: PartProps) {
  const stroke = Math.max(2, size * 0.09);
  const r = (size - stroke) / 2;
  return (
    <motion.svg
      width={size}
      height={size}
      viewBox={`0 0 ${size} ${size}`}
      animate={reduce ? REDUCED.animate : { rotate: 360 }}
      transition={
        reduce
          ? REDUCED.transition
          : { duration: speed, ease: "linear", repeat: Infinity }
      }
    >
      <circle
        cx={size / 2}
        cy={size / 2}
        r={r}
        fill="none"
        stroke="currentColor"
        strokeOpacity={0.2}
        strokeWidth={stroke}
      />
      <path
        d={`M ${size / 2} ${size / 2 - r} A ${r} ${r} 0 0 1 ${size / 2 + r} ${size / 2}`}
        fill="none"
        stroke="currentColor"
        strokeWidth={stroke}
        strokeLinecap="round"
      />
    </motion.svg>
  );
}

function Dots({ size, speed, reduce }: PartProps) {
  const dot = size * 0.24;
  return (
    <span className="flex items-center" style={{ gap: size * 0.14 }}>
      {[0, 1, 2].map((i) => (
        <motion.span
          key={i}
          className="rounded-full bg-current"
          style={{ width: dot, height: dot }}
          animate={
            reduce
              ? { opacity: [0.4, 1, 0.4] }
              : { y: [0, -size * 0.3, 0], opacity: [0.5, 1, 0.5] }
          }
          transition={{
            duration: speed,
            ease: EASE_IN_OUT,
            repeat: Infinity,
            delay: i * speed * 0.16,
          }}
        />
      ))}
    </span>
  );
}

function Ascii({
  frames,
  size,
  speed,
  reduce,
}: PartProps & { frames: string[] }) {
  const [frame, setFrame] = useState(0);
  useEffect(() => {
    // Reduced motion slows the cycle rather than stopping it — it's a glyph
    // swap, not on-screen movement.
    const step = ((reduce ? speed * 2.5 : speed) / frames.length) * 1000;
    const id = setInterval(
      () => setFrame((f) => (f + 1) % frames.length),
      step,
    );
    return () => clearInterval(id);
  }, [frames.length, speed, reduce]);

  return (
    <span
      className="font-mono leading-none tabular-nums"
      style={{ fontSize: size, lineHeight: 1 }}
    >
      {frames[frame % frames.length]}
    </span>
  );
}

// Each shape is sampled at the same number of points and emitted as an SVG
// path with identical command structure, so framer tweens the `d` attribute
// point-to-point — a real morph, not a snap. (clip-path polygon strings don't
// interpolate reliably in framer, which left the shapes broken.)
const MORPH_POINTS = 24;

function ngonRadius(ang: number, n: number, phase = 0) {
  const seg = (2 * Math.PI) / n;
  const a = ang - phase;
  const local = (((a % seg) + seg) % seg) - seg / 2;
  return Math.cos(Math.PI / n) / Math.cos(local);
}

function morphPath(radiusAt: (ang: number) => number) {
  const parts: string[] = [];
  for (let i = 0; i < MORPH_POINTS; i++) {
    const ang = (i / MORPH_POINTS) * 2 * Math.PI - Math.PI / 2;
    const r = Math.min(1.05, radiusAt(ang));
    const x = (50 + Math.cos(ang) * 46 * r).toFixed(2);
    const y = (50 + Math.sin(ang) * 46 * r).toFixed(2);
    parts.push(`${i === 0 ? "M" : "L"}${x} ${y}`);
  }
  return `${parts.join(" ")} Z`;
}

const MORPH_PATHS = [
  morphPath(() => 1), // circle
  morphPath((a) => ngonRadius(a, 4, Math.PI / 4)), // square
  morphPath((a) => ngonRadius(a, 3)), // triangle
  morphPath((a) => ngonRadius(a, 6)), // hexagon
  morphPath((a) => ngonRadius(a, 4)), // diamond
];

// Each shape appears twice in a row so it fully forms and HOLDS before the
// next morph. Even keyframe spacing then alternates hold / morph segments.
const MORPH_SEQ = [...MORPH_PATHS.flatMap((p) => [p, p]), MORPH_PATHS[0]];
// Rotation and scale only change across the morph segments, staying put on the
// holds, so a settled shape sits still.
const MORPH_ROT = [0, 0, 72, 72, 144, 144, 216, 216, 288, 288, 360];
const MORPH_SCALE = [1, 1, 0.88, 0.88, 1, 1, 0.88, 0.88, 1, 1, 1];

function Morph({ size, speed, reduce }: PartProps) {
  return (
    <motion.svg
      width={size}
      height={size}
      viewBox="0 0 100 100"
      role="img"
      animate={
        reduce
          ? { opacity: [1, 0.4, 1] }
          : { rotate: MORPH_ROT, scale: MORPH_SCALE }
      }
      transition={
        reduce
          ? { duration: 1.4, ease: EASE_IN_OUT, repeat: Infinity }
          : { duration: speed * 5, ease: EASE_IN_OUT, repeat: Infinity }
      }
    >
      <title>Loading</title>
      <motion.path
        fill="currentColor"
        d={MORPH_PATHS[0]}
        animate={reduce ? undefined : { d: MORPH_SEQ }}
        transition={
          reduce
            ? undefined
            : { duration: speed * 5, ease: EASE_IN_OUT, repeat: Infinity }
        }
      />
    </motion.svg>
  );
}

const COMET_TRAIL = [0, 1, 2, 3, 4, 5];

function Comet({ size, speed, reduce }: PartProps) {
  const head = size * 0.2;
  const r = size / 2 - head / 2;
  return (
    <span className="relative" style={{ width: size, height: size }}>
      <motion.span
        className="absolute inset-0"
        animate={reduce ? REDUCED.animate : { rotate: 360 }}
        transition={
          reduce
            ? REDUCED.transition
            : { duration: speed, ease: "linear", repeat: Infinity }
        }
      >
        {COMET_TRAIL.map((i) => {
          const scale = 1 - i * 0.13;
          const sz = head * scale;
          return (
            <span
              key={i}
              className="absolute top-1/2 left-1/2 rounded-full bg-current"
              style={{
                width: sz,
                height: sz,
                marginLeft: -sz / 2,
                marginTop: -sz / 2,
                opacity: 1 - i * 0.16,
                transform: `rotate(${-i * 15}deg) translateY(${-r}px)`,
              }}
            />
          );
        })}
      </motion.span>
    </span>
  );
}

const SCRAMBLE_TARGET = "LOADING";
const SCRAMBLE_GLYPHS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789<>/*#@";

function Scramble({ size, speed, reduce }: PartProps) {
  const [text, setText] = useState(SCRAMBLE_TARGET);
  useEffect(() => {
    if (reduce) {
      setText(SCRAMBLE_TARGET);
      return;
    }
    let tick = 0;
    const total = SCRAMBLE_TARGET.length + 4;
    const id = setInterval(
      () => {
        const reveal = tick % total;
        let s = "";
        for (let i = 0; i < SCRAMBLE_TARGET.length; i++) {
          s +=
            i < reveal
              ? SCRAMBLE_TARGET[i]
              : SCRAMBLE_GLYPHS[
                  Math.floor(Math.random() * SCRAMBLE_GLYPHS.length)
                ];
        }
        setText(s);
        tick++;
      },
      (speed / SCRAMBLE_TARGET.length) * 1000 * 0.55,
    );
    return () => clearInterval(id);
  }, [speed, reduce]);

  return (
    <span
      className="font-mono font-medium tracking-[0.2em] tabular-nums"
      style={{ fontSize: size * 0.42 }}
    >
      {text}
    </span>
  );
}

function Metaballs({ size, speed, reduce }: PartProps) {
  const id = useId().replace(/:/g, "");
  return (
    <svg width={size} height={size} viewBox="0 0 100 100" role="img">
      <title>Loading</title>
      <defs>
        <filter id={id}>
          <feGaussianBlur in="SourceGraphic" stdDeviation="5" result="b" />
          <feColorMatrix
            in="b"
            values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 20 -8"
          />
        </filter>
      </defs>
      <g filter={`url(#${id})`} fill="currentColor">
        <motion.circle
          cy="50"
          r="15"
          animate={reduce ? { opacity: [0.4, 1, 0.4] } : { cx: [30, 70, 30] }}
          transition={{ duration: speed * 1.6, ease: EASE_IN_OUT, repeat: Infinity }}
          cx={reduce ? 40 : 30}
        />
        <motion.circle
          cy="50"
          r="15"
          animate={reduce ? { opacity: [0.4, 1, 0.4] } : { cx: [70, 30, 70] }}
          transition={{ duration: speed * 1.6, ease: EASE_IN_OUT, repeat: Infinity }}
          cx={reduce ? 60 : 70}
        />
      </g>
    </svg>
  );
}

const NEWTON_BALLS = [0, 1, 2, 3, 4];

function Newton({ size, speed, reduce }: PartProps) {
  const d = size * 0.2;
  const out = d * 1.1;
  // Only the end balls move: the left slides out and back on the first half,
  // then the right on the second half — the impact appears to jump the three
  // still middle balls. Pure horizontal slide, no swing, no strings.
  const moves: Record<number, { x: number[]; times: number[] }> = {
    0: { x: [0, -out, 0, 0], times: [0, 0.28, 0.5, 1] },
    4: { x: [0, 0, out, 0], times: [0, 0.5, 0.78, 1] },
  };

  return (
    <span className="flex items-center justify-center" style={{ height: d }}>
      {NEWTON_BALLS.map((i) => {
        const move = moves[i];
        return (
          <motion.span
            key={i}
            className="rounded-full bg-current"
            style={{ width: d, height: d }}
            animate={reduce || !move ? undefined : { x: move.x }}
            transition={
              reduce || !move
                ? undefined
                : {
                    duration: speed * 1.5,
                    ease: EASE_IN_OUT,
                    repeat: Infinity,
                    times: move.times,
                  }
            }
          />
        );
      })}
    </span>
  );
}

function Helix({ size, speed, reduce }: PartProps) {
  const rows = 7;
  const dot = size * 0.14;
  const amp = size * 0.32;
  return (
    <span className="relative" style={{ width: size, height: size }}>
      {Array.from({ length: rows }, (_, r) => {
        const top = (r / (rows - 1)) * (size - dot);
        const delay = (r / rows) * speed;
        return (
          <span key={`row-${top}`}>
            <motion.span
              className="absolute rounded-full bg-current"
              style={{ width: dot, height: dot, left: size / 2 - dot / 2, top }}
              animate={
                reduce
                  ? { opacity: [0.4, 1, 0.4] }
                  : {
                      x: [amp, -amp, amp],
                      scale: [1, 0.5, 1],
                      opacity: [1, 0.45, 1],
                    }
              }
              transition={{
                duration: speed,
                ease: EASE_IN_OUT,
                repeat: Infinity,
                delay,
              }}
            />
            <motion.span
              className="absolute rounded-full bg-current"
              style={{ width: dot, height: dot, left: size / 2 - dot / 2, top }}
              animate={
                reduce
                  ? { opacity: [0.4, 1, 0.4] }
                  : {
                      x: [-amp, amp, -amp],
                      scale: [0.5, 1, 0.5],
                      opacity: [0.45, 1, 0.45],
                    }
              }
              transition={{
                duration: speed,
                ease: EASE_IN_OUT,
                repeat: Infinity,
                delay,
              }}
            />
          </span>
        );
      })}
    </span>
  );
}

function Percent({ size, speed, reduce }: PartProps) {
  const [p, setP] = useState(0);
  useEffect(() => {
    const dur = (reduce ? speed * 2 : speed) * 1000;
    const start = { t: 0 };
    const tickMs = 40;
    const id = setInterval(() => {
      start.t += tickMs;
      const next = Math.min(100, Math.round((start.t / dur) * 100));
      setP(next);
      if (next >= 100) start.t = 0;
    }, tickMs);
    return () => clearInterval(id);
  }, [speed, reduce]);

  return (
    <span
      className="flex flex-col items-center"
      style={{ gap: size * 0.14, width: size * 1.4 }}
    >
      <span
        className="font-mono font-medium tabular-nums"
        style={{ fontSize: size * 0.42, lineHeight: 1 }}
      >
        {p}%
      </span>
      <span
        className="w-full overflow-hidden rounded-full bg-current/15"
        style={{ height: Math.max(3, size * 0.1) }}
      >
        <span
          className="block h-full rounded-full bg-current"
          style={{ width: `${p}%` }}
        />
      </span>
    </span>
  );
}

function Bars({ size, speed, reduce }: PartProps) {
  const bar = size * 0.16;
  return (
    <span className="flex items-center" style={{ gap: size * 0.1, height: size }}>
      {[0, 1, 2, 3].map((i) => (
        <motion.span
          key={i}
          className="rounded-full bg-current"
          style={{ width: bar, height: size, originY: 1 }}
          animate={
            reduce ? { opacity: [0.4, 1, 0.4] } : { scaleY: [0.3, 1, 0.3] }
          }
          transition={{
            duration: speed,
            ease: EASE_IN_OUT,
            repeat: Infinity,
            delay: i * speed * 0.12,
          }}
        />
      ))}
    </span>
  );
}

function DotMatrix({ size, speed, reduce }: PartProps) {
  const n = 3;
  const gap = size * 0.14;
  const dot = (size - gap * (n - 1)) / n;
  const cells = Array.from({ length: n * n }, (_, idx) => idx);
  return (
    <span
      className="grid"
      style={{
        gap,
        gridTemplateColumns: `repeat(${n}, ${dot}px)`,
      }}
    >
      {cells.map((idx) => {
        const x = idx % n;
        const y = Math.floor(idx / n);
        // Diagonal wave: cells light in order of their distance from the corner.
        const delay = ((x + y) / (2 * (n - 1))) * speed;
        return (
          <motion.span
            key={idx}
            className="rounded-full bg-current"
            style={{ width: dot, height: dot }}
            animate={
              reduce
                ? { opacity: [0.3, 1, 0.3] }
                : { opacity: [0.2, 1, 0.2], scale: [0.7, 1, 0.7] }
            }
            transition={{
              duration: speed,
              ease: EASE_IN_OUT,
              repeat: Infinity,
              delay,
            }}
          />
        );
      })}
    </span>
  );
}

// Ordered Bayer 4x4 matrix — the classic dithering threshold pattern. Cells
// light in this order, so the fill shimmers like a dissolving halftone.
const BAYER_4 = [
  0, 8, 2, 10, 12, 4, 14, 6, 3, 11, 1, 9, 15, 7, 13, 5,
];

function Dither({ size, speed, reduce }: PartProps) {
  const n = 4;
  const gap = Math.max(1, size * 0.05);
  const cell = (size - gap * (n - 1)) / n;
  return (
    <span
      className="grid"
      style={{ gap, gridTemplateColumns: `repeat(${n}, ${cell}px)` }}
    >
      {BAYER_4.map((order, idx) => (
        <motion.span
          // biome-ignore lint/suspicious/noArrayIndexKey: fixed matrix cells, order never changes
          key={idx}
          className="bg-current"
          style={{ width: cell, height: cell }}
          animate={reduce ? { opacity: [0.3, 1, 0.3] } : { opacity: [0.1, 1, 0.1] }}
          transition={{
            duration: speed,
            ease: EASE_IN_OUT,
            repeat: Infinity,
            delay: (order / BAYER_4.length) * speed,
          }}
        />
      ))}
    </span>
  );
}

"use client";

import { animate, motion, MotionConfig, useReducedMotion } from "motion/react";
import { useEffect, useId, useRef, useState } from "react";
import { TOUCH_TARGET_CLASS } from "@/lib/touch";
import { cn } from "@/lib/utils";

// Heavy, deliberate thumb — high mass keeps the travel weighty without wobble.
const THUMB_SPRING = { type: "spring", stiffness: 800, damping: 80, mass: 4 } as const;

export interface SwitchProps {
  checked: boolean;
  onCheckedChange: (checked: boolean) => void;
  disabled?: boolean;
  label?: string;
  ariaLabel?: string;
  className?: string;
}

export function Switch({
  checked,
  onCheckedChange,
  disabled,
  label,
  ariaLabel,
  className,
}: SwitchProps) {
  const id = useId();
  const thumbRef = useRef<HTMLDivElement>(null);
  const reduce = useReducedMotion();
  const [isPressed, setIsPressed] = useState(false);
  const [isPointer, setIsPointer] = useState(false);

  // Disabled shake feedback when pressed.
  useEffect(() => {
    if (!thumbRef.current || reduce) return;
    if (disabled && isPressed) {
      animate(
        thumbRef.current,
        { x: [0, -2, 2, -1, 0] },
        { delay: 0.2, duration: 0.6 },
      );
    }
  }, [disabled, isPressed, reduce]);

  const squish = !disabled && isPointer && isPressed && !reduce;

  return (
    <MotionConfig transition={reduce ? { duration: 0 } : THUMB_SPRING}>
      <span className={cn("inline-flex items-center gap-3", className)}>
        <motion.button
          id={id}
          type="button"
          role="switch"
          aria-checked={checked}
          aria-label={ariaLabel}
          disabled={disabled}
          onClick={() => !disabled && onCheckedChange(!checked)}
          onPointerDown={(e) => {
            setIsPressed(true);
            setIsPointer(e.type.startsWith("pointer"));
          }}
          onPointerUp={() => setIsPressed(false)}
          onPointerLeave={() => setIsPressed(false)}
          initial={false}
          data-state={checked ? "checked" : "unchecked"}
          className={cn(
            "group peer relative inline-flex h-7 w-12 shrink-0 cursor-pointer items-center px-1 rounded-full outline-none transition-colors duration-200",
            TOUCH_TARGET_CLASS,
            "focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2 focus-visible:ring-offset-background",
            "disabled:cursor-not-allowed disabled:opacity-60",
            checked ? "justify-end bg-primary" : "justify-start bg-muted-foreground/60",
          )}
        >
          <motion.div
            ref={thumbRef}
            layout
            animate={{ scale: squish ? 0.9 : 1 }}
            className="pointer-events-none block h-5 w-5 rounded-full bg-background shadow-md"
          >
            {/* Stretch toward the destination while active. */}
            <div
              className={cn(
                "size-5",
                squish && (checked ? "ml-1" : "mr-1"),
              )}
            />
          </motion.div>
        </motion.button>
        {label ? (
          <label htmlFor={id} className="cursor-pointer text-sm text-foreground">
            {label}
          </label>
        ) : null}
      </span>
    </MotionConfig>
  );
}