CTA Section

// 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 { 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;
}

// 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/blocks/cta-section

import { Check, Send } from "lucide-react";
import { motion, type Transition, useReducedMotion } from "motion/react";
import {
  type ElementType,
  type FormEvent,
  type ReactNode,
  useEffect,
  useId,
  useRef,
  useState,
} from "react";
import {
  Button,
  ButtonLink,
  type ButtonState,
  StatefulButton,
} from "@/components/motion/button";
import { TextReveal } from "@/components/motion/text-reveal";
import { EASE_OUT } from "@/lib/ease";
import { cn } from "@/lib/utils";

export interface CtaAction {
  label: ReactNode;
  href?: string;
  onClick?: () => void;
  /** Trailing icon. */
  icon?: ReactNode;
}

export interface CtaEmailCapture {
  /** Resolve to show success; reject to show the retry state. */
  onSubscribe: (email: string) => Promise<void> | void;
  placeholder?: string;
  buttonLabel?: ReactNode;
  successMessage?: ReactNode;
  /** Small print under the field, e.g. "Unsubscribe any time." */
  note?: ReactNode;
}

export interface CtaSectionProps {
  /** "centered" stacks everything in one card; "split" puts copy left and a visual or email capture right. */
  variant?: "centered" | "split";
  eyebrow?: ReactNode;
  /** Revealed word by word when the section scrolls into view. */
  headline: string | string[];
  description?: ReactNode;
  primaryAction?: CtaAction;
  secondaryAction?: CtaAction;
  /** Short reassurance list ("No credit card", "Cancel any time"). */
  checklist?: ReactNode[];
  /** Email field with a stateful submit button. */
  emailCapture?: CtaEmailCapture;
  /** Right column for `variant="split"` (mock UI, illustration). When omitted, the email capture takes that slot. */
  visual?: ReactNode;
  /** Card decoration: rotating gradient beam on the border, a dotted field, or nothing. Default "beam". */
  background?: "beam" | "dots" | "none";
  /** Heading element for the headline. Default "h2". */
  headingAs?: ElementType;
  className?: string;
  cardClassName?: string;
}

const WORD_STAGGER = 0.05;
const ENTER: Transition = { duration: 0.5, ease: EASE_OUT };

// Beam sweep: decorative and slow so the border never pulls focus from the
// copy; linear so the light travels at a constant speed around the card.
const BEAM_TRANSITION: Transition = {
  duration: 8,
  ease: "linear",
  repeat: Number.POSITIVE_INFINITY,
};

function isEmail(value: string) {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(value.trim());
}

function wordCount(text: string | string[]) {
  return (Array.isArray(text) ? text.join(" ") : text)
    .split(/\s+/)
    .filter(Boolean).length;
}

function ActionButton({
  action,
  variant,
}: {
  action: CtaAction;
  variant: "primary" | "secondary";
}) {
  const content = (
    <>
      {action.label}
      {action.icon ?? null}
    </>
  );
  return action.href ? (
    <ButtonLink href={action.href} onClick={action.onClick} variant={variant}>
      {content}
    </ButtonLink>
  ) : (
    <Button onClick={action.onClick} variant={variant}>
      {content}
    </Button>
  );
}

function EmailCapture({
  capture,
  align,
}: {
  capture: CtaEmailCapture;
  align: "center" | "left";
}) {
  const id = useId();
  const [email, setEmail] = useState("");
  const [state, setState] = useState<ButtonState>("idle");
  const [error, setError] = useState<string | null>(null);
  const timer = useRef<number | undefined>(undefined);

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

  const submit = async (event: FormEvent<HTMLFormElement>) => {
    event.preventDefault();
    if (state === "loading" || state === "success") return;
    if (!isEmail(email)) {
      setError("Enter a valid email address.");
      return;
    }
    setError(null);
    setState("loading");
    try {
      await capture.onSubscribe(email.trim());
      setState("success");
    } catch {
      setState("error");
      setError("Something went wrong. Try again.");
      timer.current = window.setTimeout(() => setState("idle"), 2400);
    }
  };

  const done = state === "success";

  return (
    <form
      noValidate
      onSubmit={submit}
      className={cn(
        "flex w-full max-w-md flex-col gap-2",
        align === "center" && "mx-auto",
      )}
    >
      <div className="flex flex-col gap-2 @sm:flex-row @sm:items-center">
        <label htmlFor={`${id}-email`} className="sr-only">
          Email address
        </label>
        <input
          id={`${id}-email`}
          type="email"
          inputMode="email"
          autoComplete="email"
          value={email}
          disabled={done}
          aria-invalid={error ? true : undefined}
          aria-describedby={`${id}-status`}
          onChange={(event) => {
            setEmail(event.target.value);
            if (error && isEmail(event.target.value)) setError(null);
          }}
          placeholder={capture.placeholder ?? "you@company.com"}
          className={cn(
            "h-10 min-w-0 flex-1 rounded-full border bg-background px-4 text-sm text-foreground outline-none transition-colors placeholder:text-muted-foreground focus-visible:ring-2 disabled:opacity-60",
            error
              ? "border-destructive focus-visible:ring-destructive/30"
              : "border-border focus-visible:border-border-strong focus-visible:ring-ring/40",
          )}
        />
        <StatefulButton
          type="submit"
          state={state}
          loadingText="Sending"
          successText="You're in"
          errorText="Retry"
          icon={<Send aria-hidden className="size-3.5" />}
          className="shrink-0"
        >
          {capture.buttonLabel ?? "Get started"}
        </StatefulButton>
      </div>
      <p
        id={`${id}-status`}
        aria-live="polite"
        className={cn(
          "min-h-5 text-xs",
          align === "center" && "text-center",
          error ? "text-destructive" : "text-muted-foreground",
        )}
      >
        {error ??
          (done
            ? (capture.successMessage ?? "Thanks! Check your inbox.")
            : (capture.note ?? ""))}
      </p>
    </form>
  );
}

function CardBackground({
  background,
  reduce,
}: {
  background: "beam" | "dots" | "none";
  reduce: boolean | null;
}) {
  if (background === "none") return null;
  if (background === "dots") {
    return (
      <div
        aria-hidden
        className="pointer-events-none absolute inset-0 bg-[radial-gradient(var(--border-strong)_1px,transparent_1px)] bg-[size:18px_18px] [mask-image:radial-gradient(ellipse_70%_70%_at_50%_40%,black,transparent)]"
      />
    );
  }
  // Beam: an oversized conic gradient spins behind the card; the card body
  // sits 1px inside it, so only a moving sliver shows along the border.
  return (
    <motion.div
      aria-hidden
      className="pointer-events-none absolute top-1/2 left-1/2 aspect-square w-[max(200%,40rem)] bg-[conic-gradient(from_0deg,transparent_0deg,transparent_250deg,var(--chart-1)_300deg,var(--chart-2)_330deg,transparent_360deg)]"
      style={{ x: "-50%", y: "-50%" }}
      initial={{ rotate: 0 }}
      animate={reduce ? { rotate: 0 } : { rotate: 360 }}
      transition={reduce ? { duration: 0 } : BEAM_TRANSITION}
    />
  );
}

/**
 * Closing call-to-action band. `centered` puts a large headline, supporting
 * copy, two CTAs and an optional reassurance checklist inside one card;
 * `split` sets the copy beside a visual or an email capture. The headline
 * reveals word by word on view and the rest follows. The card can carry a
 * rotating gradient beam along its border or a soft dotted field. Layout
 * reads the section's own container width.
 */
export function CtaSection({
  variant = "centered",
  eyebrow,
  headline,
  description,
  primaryAction,
  secondaryAction,
  checklist,
  emailCapture,
  visual,
  background = "beam",
  headingAs = "h2",
  className,
  cardClassName,
}: CtaSectionProps) {
  const reduce = useReducedMotion();
  const centered = variant === "centered";
  const align = centered ? "center" : "left";
  const after = Math.min(1, 0.15 + wordCount(headline) * WORD_STAGGER);

  const enter = (delay: number) => ({
    initial: reduce ? { opacity: 0 } : { opacity: 0, y: 12 },
    whileInView: reduce ? { opacity: 1 } : { opacity: 1, y: 0 },
    viewport: { once: true, amount: 0.4 },
    transition: { ...ENTER, delay },
  });

  // In split mode the email capture fills the right column unless a visual
  // claims it; then it moves under the copy.
  const captureInAside = !centered && !visual && Boolean(emailCapture);

  const copy = (
    <div
      className={cn(
        "relative flex flex-col gap-4",
        centered ? "items-center text-center" : "items-start text-left",
      )}
    >
      {eyebrow ? (
        <motion.p
          {...enter(0)}
          className="text-xs font-medium uppercase tracking-[0.2em] text-muted-foreground"
        >
          {eyebrow}
        </motion.p>
      ) : null}
      <TextReveal
        as={headingAs}
        text={headline}
        whileInView
        stagger={WORD_STAGGER}
        delay={0.05}
        blur={8}
        yOffset="30%"
        className={cn(
          "text-balance font-display font-semibold leading-[1.1] tracking-tight text-foreground",
          centered
            ? "text-3xl @lg:text-4xl @3xl:text-5xl"
            : "text-2xl @lg:text-3xl @3xl:text-4xl",
        )}
      />
      {description ? (
        <motion.p
          {...enter(after)}
          className="max-w-xl text-pretty text-sm leading-6 text-muted-foreground @md:text-base @md:leading-7"
        >
          {description}
        </motion.p>
      ) : null}
      {primaryAction || secondaryAction ? (
        <motion.div
          {...enter(after + 0.08)}
          className={cn(
            "mt-1 flex flex-wrap items-center gap-3",
            centered && "justify-center",
          )}
        >
          {primaryAction ? (
            <ActionButton action={primaryAction} variant="primary" />
          ) : null}
          {secondaryAction ? (
            <ActionButton action={secondaryAction} variant="secondary" />
          ) : null}
        </motion.div>
      ) : null}
      {emailCapture && !captureInAside ? (
        <motion.div {...enter(after + 0.12)} className="mt-1 w-full">
          <EmailCapture capture={emailCapture} align={align} />
        </motion.div>
      ) : null}
      {checklist?.length ? (
        <motion.ul
          initial="hidden"
          whileInView="show"
          viewport={{ once: true, amount: 0.4 }}
          variants={{
            show: {
              transition: { staggerChildren: 0.06, delayChildren: after + 0.16 },
            },
          }}
          className={cn(
            "flex flex-wrap gap-x-5 gap-y-2 text-xs text-muted-foreground @md:text-sm",
            centered && "justify-center",
          )}
        >
          {checklist.map((item, index) => (
            <motion.li
              // biome-ignore lint/suspicious/noArrayIndexKey: checklist is a static positional list.
              key={index}
              variants={{
                hidden: reduce ? { opacity: 0 } : { opacity: 0, y: 6 },
                show: { opacity: 1, y: 0, transition: ENTER },
              }}
              className="inline-flex items-center gap-1.5"
            >
              <span className="grid size-4 place-items-center rounded-full bg-primary/10 text-primary">
                <Check aria-hidden className="size-3" strokeWidth={3} />
              </span>
              {item}
            </motion.li>
          ))}
        </motion.ul>
      ) : null}
    </div>
  );

  return (
    <section className={cn("@container w-full", className)}>
      <div
        className={cn(
          "relative isolate overflow-hidden rounded-3xl",
          background === "beam"
            ? "bg-border p-px"
            : "border border-border bg-card",
          cardClassName,
        )}
      >
        <CardBackground background={background} reduce={reduce} />
        <div
          className={cn(
            "relative overflow-hidden",
            background === "beam" && "rounded-[calc(var(--radius-3xl)-1px)] bg-card",
            centered
              ? "px-6 py-12 @3xl:px-12 @3xl:py-16"
              : "grid items-center gap-8 p-6 @2xl:grid-cols-[1.15fr_1fr] @3xl:p-10",
          )}
        >
          {/* Soft top glow so the card reads as lit from the beam side. */}
          <div
            aria-hidden
            className="pointer-events-none absolute inset-x-0 top-0 h-2/3 bg-[radial-gradient(50%_60%_at_50%_0%,color-mix(in_oklab,var(--foreground)_6%,transparent),transparent)]"
          />
          {copy}
          {!centered && (visual || captureInAside) ? (
            <motion.div
              initial={reduce ? { opacity: 0 } : { opacity: 0, y: 16, scale: 0.98 }}
              whileInView={reduce ? { opacity: 1 } : { opacity: 1, y: 0, scale: 1 }}
              viewport={{ once: true, amount: 0.3 }}
              transition={{ ...ENTER, delay: 0.2 }}
              className="relative @container"
            >
              {visual ??
                (emailCapture ? (
                  <div className="rounded-2xl border border-border bg-background/60 p-5 shadow-sm">
                    <EmailCapture capture={emailCapture} align="left" />
                  </div>
                ) : null)}
            </motion.div>
          ) : null}
        </div>
      </div>
    </section>
  );
}

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 { motion, type Transition, useInView, useReducedMotion } from "motion/react";
import { useRef, type ElementType, type ReactNode } from "react";
import { EASE_OUT } from "@/lib/ease";
import { cn } from "@/lib/utils";

type SplitMode = "word" | "char";

export interface TextRevealProps {
  text: string | string[];
  as?: ElementType;
  className?: string;
  split?: SplitMode;
  stagger?: number;
  delay?: number;
  blur?: number;
  yOffset?: string | number;
  spring?: { stiffness?: number; damping?: number; mass?: number };
  once?: boolean;
  whileInView?: boolean;
  children?: ReactNode;
}

const DEFAULT_SPRING = { stiffness: 140, damping: 26, mass: 1.2 };

type WordGroup = { text: string; trailing: string };

/**
 * One tokenizer for both modes: a line becomes the words it is made of, each
 * carrying the whitespace that follows it. Word mode animates a group at a
 * time, char mode the characters inside one — so the two can't drift apart on
 * what counts as a word or where a space belongs. Runs of whitespace and tabs
 * survive as their own group rather than collapsing.
 */
function toWordGroups(line: string): WordGroup[] {
  const chunks = line.match(/\S+\s*|\s+/g) ?? [];
  return chunks.map((chunk) => {
    const text = chunk.replace(/\s+$/, "");
    return { text, trailing: chunk.slice(text.length) };
  });
}

export function TextReveal({
  text,
  as: Comp = "span",
  className,
  split = "word",
  stagger = 0.09,
  delay = 0,
  blur = 12,
  yOffset = "40%",
  spring,
  once = true,
  whileInView = false,
  children,
}: TextRevealProps) {
  const ref = useRef<HTMLElement>(null);
  const inView = useInView(ref, { once, amount: 0.4 });
  const reduce = useReducedMotion();
  const shouldAnimate = whileInView ? inView : true;

  const lines = Array.isArray(text) ? text : [text];
  const s = { ...DEFAULT_SPRING, ...spring };

  let unitIndex = 0;
  const lineCounts = new Map<string, number>();

  return (
    <Comp ref={ref} className={cn("block", className)}>
      {lines.map((line) => {
        const lineCount = lineCounts.get(line) ?? 0;
        lineCounts.set(line, lineCount + 1);
        const lineKey = `${line}-${lineCount}`;
        const unitCounts = new Map<string, number>();

        const renderUnit = (unit: string) => {
          const d = delay + unitIndex * stagger;
          unitIndex += 1;
          const unitCount = unitCounts.get(unit) ?? 0;
          unitCounts.set(unit, unitCount + 1);
          const unitKey = `${unit}-${unitCount}`;
          const initial = reduce
            ? { opacity: 0 }
            : { y: yOffset, opacity: 0, filter: `blur(${blur}px)` };
          const animate = shouldAnimate
            ? reduce
              ? { opacity: 1 }
              : { y: 0, opacity: 1, filter: "blur(0px)" }
            : initial;
          const transition: Transition = reduce
            ? { opacity: { duration: 0.25, ease: EASE_OUT, delay: d * 0.3 } }
            : {
                y: { type: "spring" as const, ...s, delay: d },
                opacity: { duration: 0.7, ease: EASE_OUT, delay: d },
                filter: { duration: 0.9, ease: EASE_OUT, delay: d },
              };
          return (
            <motion.span
              key={unitKey}
              initial={initial}
              animate={animate}
              transition={transition}
              // `whitespace-pre` is load-bearing: a unit's trailing space is
              // inside an inline-block and would otherwise collapse to zero
              // width, running every word together.
              className="inline-block whitespace-pre will-change-transform"
            >
              {unit}
            </motion.span>
          );
        };

        const groups = toWordGroups(line);
        const groupCounts = new Map<string, number>();

        return (
          <span key={lineKey} className="block">
            {groups.map((group) => {
              const whole = group.text + group.trailing;
              // Characters animate one at a time, but each word (plus the
              // space that follows it) sits in its own inline-block so a long
              // line wraps between words instead of mid-word.
              if (split !== "char") return renderUnit(whole);

              const groupCount = groupCounts.get(whole) ?? 0;
              groupCounts.set(whole, groupCount + 1);
              return (
                <span
                  key={`${whole}-${groupCount}`}
                  className="inline-block whitespace-pre"
                >
                  {Array.from(whole).map((char) => renderUnit(char))}
                </span>
              );
            })}
          </span>
        );
      })}
      {children}
    </Comp>
  );
}

"use client";

import {
  AnimatePresence,
  type HTMLMotionProps,
  motion,
  useReducedMotion,
} from "motion/react";
import {
  forwardRef,
  type PointerEvent,
  type ReactNode,
  useCallback,
  useRef,
  useState,
} from "react";
import { EASE_OUT, SPRING_PRESS } from "@/lib/ease";
import { useHoverCapable } from "@/lib/hooks/use-hover-capable";
import { TOUCH_TARGET_CLASS } from "@/lib/touch";
import { cn } from "@/lib/utils";

export type ButtonVariant = "primary" | "secondary" | "ghost" | "outline";
export type ButtonSize = "sm" | "md" | "lg" | "icon";

export interface ButtonProps extends Omit<
  HTMLMotionProps<"button">,
  "children"
> {
  variant?: ButtonVariant;
  size?: ButtonSize;
  pressScale?: number;
  /** Spawn a Material-style ripple from the press point. Off by default. */
  ripple?: boolean;
  children?: ReactNode;
}

export interface ButtonLinkProps extends Omit<
  HTMLMotionProps<"a">,
  "children"
> {
  variant?: ButtonVariant;
  size?: ButtonSize;
  pressScale?: number;
  children?: ReactNode;
}

type Ripple = { id: number; x: number; y: number; size: number };

const VARIANT_CLASS: Record<ButtonVariant, string> = {
  primary: "bg-primary text-primary-foreground hover:bg-primary/90",
  secondary: "border border-border bg-card text-foreground hover:border-border",
  ghost: "text-muted-foreground hover:text-foreground hover:bg-primary/5",
  outline:
    "border border-border bg-transparent text-foreground hover:bg-primary/5",
};

const SIZE_CLASS: Record<ButtonSize, string> = {
  sm: "h-8 px-3 text-xs gap-1.5 rounded-full",
  md: "h-10 px-5 text-sm gap-2 rounded-full",
  lg: "h-12 px-6 text-base gap-2 rounded-full",
  icon: "h-8 w-8 rounded-lg",
};

export const Button = forwardRef<HTMLButtonElement, ButtonProps>(
  function Button(
    {
      variant = "primary",
      size = "md",
      pressScale = 0.93,
      ripple = false,
      className,
      children,
      onPointerDown,
      ...rest
    },
    ref,
  ) {
    const reduce = useReducedMotion();
    const canHover = useHoverCapable();
    const [ripples, setRipples] = useState<Ripple[]>([]);
    const nextId = useRef(0);

    const handlePointerDown = useCallback(
      (event: PointerEvent<HTMLButtonElement>) => {
        if (ripple && !reduce) {
          const rect = event.currentTarget.getBoundingClientRect();
          const size = Math.max(rect.width, rect.height) * 2;
          const id = nextId.current++;
          setRipples((prev) => [
            ...prev,
            {
              id,
              x: event.clientX - rect.left,
              y: event.clientY - rect.top,
              size,
            },
          ]);
        }
        onPointerDown?.(event);
      },
      [ripple, reduce, onPointerDown],
    );

    return (
      <motion.button
        ref={ref}
        type="button"
        whileTap={reduce ? undefined : { scale: pressScale }}
        whileHover={reduce || !canHover ? undefined : { scale: 1.02 }}
        transition={SPRING_PRESS}
        onPointerDown={handlePointerDown}
        className={cn(
          "relative inline-flex items-center justify-center font-medium select-none",
          "transition-colors",
          "disabled:pointer-events-none disabled:opacity-50",
          // The ripple layer clips itself, so on a touch screen the button can
          // stop clipping and let its enlarged hit area overhang.
          ripple && "overflow-hidden pointer-coarse:overflow-visible",
          TOUCH_TARGET_CLASS,
          VARIANT_CLASS[variant],
          SIZE_CLASS[size],
          className,
        )}
        {...rest}
      >
        {ripple && !reduce ? (
          <span className="pointer-events-none absolute inset-0 overflow-hidden rounded-[inherit]">
            <AnimatePresence>
              {ripples.map((r) => (
                <motion.span
                  key={r.id}
                  className="absolute rounded-full bg-current"
                  style={{
                    left: r.x,
                    top: r.y,
                    width: r.size,
                    height: r.size,
                    x: "-50%",
                    y: "-50%",
                  }}
                  initial={{ scale: 0.05, opacity: 0.3 }}
                  animate={{ scale: 1, opacity: 0 }}
                  exit={{ opacity: 0 }}
                  transition={{ duration: 1.6, ease: EASE_OUT }}
                  onAnimationComplete={() =>
                    setRipples((prev) => prev.filter((x) => x.id !== r.id))
                  }
                />
              ))}
            </AnimatePresence>
          </span>
        ) : null}
        {children}
      </motion.button>
    );
  },
);

export const ButtonLink = forwardRef<HTMLAnchorElement, ButtonLinkProps>(
  function ButtonLink(
    {
      variant = "primary",
      size = "md",
      pressScale = 0.93,
      className,
      children,
      ...rest
    },
    ref,
  ) {
    const reduce = useReducedMotion();
    const canHover = useHoverCapable();

    return (
      <motion.a
        ref={ref}
        whileTap={reduce ? undefined : { scale: pressScale }}
        whileHover={reduce || !canHover ? undefined : { scale: 1.02 }}
        transition={SPRING_PRESS}
        className={cn(
          "relative inline-flex items-center justify-center font-medium select-none",
          "transition-colors",
          TOUCH_TARGET_CLASS,
          VARIANT_CLASS[variant],
          SIZE_CLASS[size],
          className,
        )}
        {...rest}
      >
        {children}
      </motion.a>
    );
  },
);

"use client";

import { forwardRef } from "react";
import { Magnetic } from "../magnetic";
import { Button, type ButtonProps } from "./base";

export interface MagneticButtonProps extends ButtonProps {
  /** Magnetic pull strength. Default 0.25. */
  strength?: number;
  /** Class applied to the magnetic wrapper. */
  magneticClassName?: string;
}

export const MagneticButton = forwardRef<HTMLButtonElement, MagneticButtonProps>(function MagneticButton(
  { strength = 0.25, magneticClassName, children, ...rest },
  ref,
) {
  return (
    <Magnetic strength={strength} className={magneticClassName}>
      <Button ref={ref} {...rest}>
        {children}
      </Button>
    </Magnetic>
  );
});

"use client";

import { Check, Loader2, X } from "lucide-react";
import {
  AnimatePresence,
  motion,
  useReducedMotion,
  type Variants,
} from "motion/react";
import {
  forwardRef,
  type ReactNode,
  useLayoutEffect,
  useRef,
  useState,
} from "react";
import { EASE_OUT, SPRING_SWAP } from "@/lib/ease";
import { Button, type ButtonProps } from "./base";

export type ButtonState = "idle" | "loading" | "success" | "error";

export interface StatefulButtonProps extends Omit<ButtonProps, "children"> {
  state?: ButtonState;
  children: ReactNode;
  loadingText?: ReactNode;
  successText?: ReactNode;
  errorText?: ReactNode;
  icon?: ReactNode;
}

const CASCADE_STAGGER = 0.025;
const ROLL_BLUR = "blur(6px)";

const CASCADE_LETTER_VARIANTS: Variants = {
  initial: { opacity: 0, y: "105%", filter: ROLL_BLUR },
  animate: (delay: number = 0) => ({
    opacity: 1,
    y: "0%",
    filter: "blur(0px)",
    transition: { ...SPRING_SWAP, delay },
  }),
  exit: (delay: number = 0) => ({
    opacity: 0,
    y: "-105%",
    filter: ROLL_BLUR,
    transition: { duration: 0.16, ease: EASE_OUT, delay: delay * 0.5 },
  }),
};

const ICON_VARIANTS: Variants = {
  // Width collapses too, so the icon adds/removes its own space smoothly
  // instead of popping the row width in a single frame.
  initial: { opacity: 0, width: 0, scale: 0.7, filter: ROLL_BLUR },
  animate: {
    opacity: 1,
    width: "1.5rem",
    scale: 1,
    filter: "blur(0px)",
    transition: SPRING_SWAP,
  },
  exit: {
    opacity: 0,
    width: 0,
    scale: 0.7,
    filter: ROLL_BLUR,
    transition: { duration: 0.16, ease: EASE_OUT },
  },
};

function IconSlot({ keyId, children }: { keyId: string; children: ReactNode }) {
  const reduce = useReducedMotion();
  return (
    <motion.span
      key={keyId}
      variants={ICON_VARIANTS}
      initial={reduce ? { opacity: 0 } : "initial"}
      animate={reduce ? { opacity: 1 } : "animate"}
      exit={reduce ? { opacity: 0 } : "exit"}
      transition={reduce ? { duration: 0.15 } : undefined}
      className="inline-grid shrink-0 place-items-center overflow-hidden"
    >
      {children}
    </motion.span>
  );
}

function TextSlot({
  value,
  children,
}: {
  value: string;
  children: ReactNode;
}) {
  const reduce = useReducedMotion();
  const measureRef = useRef<HTMLSpanElement>(null);
  const [width, setWidth] = useState<number>();
  const label = typeof children === "string" ? children : null;
  const cascade = label !== null && !reduce;

  // Measure strings with the same per-letter layout as the cascade. Measuring
  // the whole string preserves kerning, which can make it narrower than the
  // inline-block letters and clip the final glyph during the width animation.
  useLayoutEffect(() => {
    const nextWidth = measureRef.current?.offsetWidth;
    if (!nextWidth) return;
    setWidth((current) => (current === nextWidth ? current : nextWidth));
  });

  return (
    <motion.span
      initial={false}
      animate={{ width }}
      transition={reduce ? { duration: 0 } : SPRING_SWAP}
      className="relative inline-block overflow-hidden whitespace-nowrap align-bottom"
    >
      <span
        ref={measureRef}
        aria-hidden
        className="invisible inline-block whitespace-nowrap"
      >
        {cascade
          ? label.split("").map((char, index) => (
              <span
                // biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity.
                key={index}
                className="inline-block whitespace-pre"
              >
                {char}
              </span>
            ))
          : children}
      </span>

      {cascade ? (
        <>
          <span className="sr-only">{label}</span>
          <AnimatePresence initial={false}>
            <motion.span
              key={`cascade-${value}`}
              aria-hidden
              initial="initial"
              animate="animate"
              exit="exit"
              className="absolute left-0 top-0 inline-block whitespace-pre"
            >
              {label.split("").map((char, index) => (
                <motion.span
                  // biome-ignore lint/suspicious/noArrayIndexKey: position is the slot identity.
                  key={index}
                  custom={index * CASCADE_STAGGER}
                  variants={CASCADE_LETTER_VARIANTS}
                  className="inline-block whitespace-pre will-change-[opacity,filter,transform]"
                >
                  {char}
                </motion.span>
              ))}
            </motion.span>
          </AnimatePresence>
        </>
      ) : (
        <AnimatePresence initial={false}>
          <motion.span
            key={`text-${value}`}
            initial={reduce ? { opacity: 0 } : { opacity: 0, y: 14, filter: ROLL_BLUR }}
            animate={reduce ? { opacity: 1 } : { opacity: 1, y: 0, filter: "blur(0px)" }}
            exit={reduce ? { opacity: 0 } : { opacity: 0, y: -14, filter: ROLL_BLUR }}
            transition={reduce ? { duration: 0.15 } : SPRING_SWAP}
            className="absolute left-0 top-0 inline-block will-change-[opacity,filter,transform]"
          >
            {children}
          </motion.span>
        </AnimatePresence>
      )}
    </motion.span>
  );
}

export const StatefulButton = forwardRef<HTMLButtonElement, StatefulButtonProps>(function StatefulButton(
  {
    state = "idle",
    children,
    loadingText = "Loading",
    successText = "Done",
    errorText = "Try again",
    icon,
    disabled,
    ...rest
  },
  ref,
) {
  const isBusy = state === "loading";
  const stateText =
    state === "loading"
      ? loadingText
      : state === "success"
        ? successText
        : state === "error"
        ? errorText
        : children;
  const textKey =
    typeof stateText === "string" ? `${state}-${stateText}` : state;

  return (
    <Button ref={ref} disabled={disabled || isBusy} aria-busy={isBusy} whileHover={undefined} {...rest}>
      <span
        aria-live="polite"
        className="relative inline-flex items-center justify-center overflow-hidden"
      >
        <AnimatePresence initial={false}>
          {state === "loading" ? (
            <IconSlot keyId="loading-icon">
              <Loader2 className="h-4 w-4 animate-spin" />
            </IconSlot>
          ) : null}
          {state === "success" ? (
            <IconSlot keyId="success-icon">
              <Check className="h-4 w-4" />
            </IconSlot>
          ) : null}
          {state === "error" ? (
            <IconSlot keyId="error-icon">
              <X className="h-4 w-4" />
            </IconSlot>
          ) : null}
        </AnimatePresence>

        <TextSlot value={textKey}>{stateText}</TextSlot>

        <AnimatePresence initial={false}>
          {state === "idle" && icon ? (
            <IconSlot keyId="idle-icon">{icon}</IconSlot>
          ) : null}
        </AnimatePresence>
      </span>
    </Button>
  );
});

"use client";

import { motion, useMotionValue, useReducedMotion, useSpring } from "motion/react";
import { useRef, type ReactNode } from "react";
import { SPRING_MOUSE } from "@/lib/ease";
import { useHoverCapable } from "@/lib/hooks/use-hover-capable";
import { cn } from "@/lib/utils";

export interface MagneticProps {
  children: ReactNode;
  strength?: number;
  className?: string;
}

export function Magnetic({ children, strength = 0.35, className }: MagneticProps) {
  const ref = useRef<HTMLDivElement>(null);
  const reduce = useReducedMotion();
  const canHover = useHoverCapable();
  // Decorative cursor-follow: skip on touch (phantom hover) and reduced motion.
  const enabled = !reduce && canHover;
  const x = useMotionValue(0);
  const y = useMotionValue(0);
  const sx = useSpring(x, SPRING_MOUSE);
  const sy = useSpring(y, SPRING_MOUSE);

  const onMove = (e: React.MouseEvent<HTMLDivElement>) => {
    const el = ref.current;
    if (!el || !enabled) return;
    const rect = el.getBoundingClientRect();
    x.set((e.clientX - rect.left - rect.width / 2) * strength);
    y.set((e.clientY - rect.top - rect.height / 2) * strength);
  };

  const onLeave = () => {
    x.set(0);
    y.set(0);
  };

  return (
    <motion.div
      ref={ref}
      onMouseMove={onMove}
      onMouseLeave={onLeave}
      style={{ x: sx, y: sy }}
      className={cn("inline-block", className)}
    >
      {children}
    </motion.div>
  );
}