Card

// 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;
}

"use client";
// beui.dev/components/motion/card

import { motion, useReducedMotion } from "motion/react";
import { type ComponentPropsWithRef, createContext, useContext } from "react";
import { SPRING_PRESS } from "@/lib/ease";
import { cn } from "@/lib/utils";

export type CardVariant = "outlined" | "muted";
export type CardSize = "default" | "compact";

const CardSizeContext = createContext<CardSize>("default");

const VARIANT_CLASS: Record<CardVariant, string> = {
  outlined: "border-border bg-background",
  muted: "border-transparent bg-muted",
};

// Each part pads itself on the inline axis, so a part can be left out without
// the others losing their edges. The root owns the block padding and the gap.
const ROOT_SIZE_CLASS: Record<CardSize, string> = {
  default: "gap-6 py-6",
  compact: "gap-4 py-4",
};
const INSET_CLASS: Record<CardSize, string> = {
  default: "px-6",
  compact: "px-4",
};

/**
 * Spread onto the one control that owns a selectable card (a Checkbox or
 * RadioGroupItem root) to stretch its hit area over the whole card. Any other
 * interactive element inside that card needs `relative z-10` to stay on top.
 */
export const CARD_TARGET_CLASS = "after:absolute after:inset-0";

export interface CardProps extends ComponentPropsWithRef<"div"> {
  /** Default "outlined". */
  variant?: CardVariant;
  /** Spacing for every part. Default "default". */
  size?: CardSize;
  /** Hover and press feedback, for a card that is one target as a whole. */
  interactive?: boolean;
  /** Marks a selectable card as chosen. Visual only; the control inside carries the state. */
  selected?: boolean;
}

export function Card({
  variant = "outlined",
  size = "default",
  interactive = false,
  selected = false,
  className,
  children,
  ...props
}: CardProps) {
  const reduce = useReducedMotion();
  return (
    <CardSizeContext.Provider value={size}>
      <motion.div
        {...(props as React.ComponentProps<typeof motion.div>)}
        data-slot="card"
        data-selected={selected || undefined}
        whileTap={interactive && !reduce ? { scale: 0.985 } : undefined}
        transition={SPRING_PRESS}
        className={cn(
          "relative flex flex-col rounded-2xl border text-card-foreground",
          "transition-[border-color,box-shadow,background-color] duration-200",
          VARIANT_CLASS[variant],
          ROOT_SIZE_CLASS[size],
          interactive && "cursor-pointer hover:border-border-strong has-focus-visible:outline-2 has-focus-visible:outline-offset-2 has-focus-visible:outline-foreground",
          selected && "border-primary shadow-[0_0_0_1px_var(--primary)] hover:border-primary",
          className,
        )}
      >
        {children}
      </motion.div>
    </CardSizeContext.Provider>
  );
}

export type CardHeaderProps = ComponentPropsWithRef<"div">;

/** Title and description, with an optional CardAction pinned to the top right. */
export function CardHeader({ className, ...props }: CardHeaderProps) {
  const size = useContext(CardSizeContext);
  return (
    <div
      {...props}
      data-slot="card-header"
      className={cn(
        "grid auto-rows-min grid-rows-[auto_auto] items-start gap-1.5",
        "has-data-[slot=card-action]:grid-cols-[1fr_auto]",
        INSET_CLASS[size],
        className,
      )}
    />
  );
}

export interface CardTitleProps extends ComponentPropsWithRef<"div"> {
  /** Heading level, when the card starts a section. Default "div". */
  as?: "div" | "h2" | "h3" | "h4";
}

export function CardTitle({ as: Tag = "div", className, ...props }: CardTitleProps) {
  return (
    <Tag
      {...props}
      data-slot="card-title"
      className={cn("text-[15px] leading-snug font-semibold text-foreground", className)}
    />
  );
}

export type CardDescriptionProps = ComponentPropsWithRef<"p">;

export function CardDescription({ className, ...props }: CardDescriptionProps) {
  return (
    <p
      {...props}
      data-slot="card-description"
      className={cn("text-sm leading-relaxed text-muted-foreground", className)}
    />
  );
}

export type CardActionProps = ComponentPropsWithRef<"div">;

/** Sits beside the title and description inside CardHeader. */
export function CardAction({ className, ...props }: CardActionProps) {
  return (
    // Flex, not block: an inline-flex control (Checkbox, Radio) would
    // otherwise sit on a text baseline that moves when its mark appears.
    <div
      {...props}
      data-slot="card-action"
      className={cn(
        "col-start-2 row-span-2 row-start-1 flex items-center self-start justify-self-end",
        className,
      )}
    />
  );
}

export type CardContentProps = ComponentPropsWithRef<"div">;

export function CardContent({ className, ...props }: CardContentProps) {
  const size = useContext(CardSizeContext);
  return <div {...props} data-slot="card-content" className={cn("text-sm", INSET_CLASS[size], className)} />;
}

export type CardFooterProps = ComponentPropsWithRef<"div">;

export function CardFooter({ className, ...props }: CardFooterProps) {
  const size = useContext(CardSizeContext);
  return (
    <div
      {...props}
      data-slot="card-footer"
      className={cn("flex items-center gap-2", INSET_CLASS[size], className)}
    />
  );
}

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

"use client";

import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import { useId } from "react";
import { EASE_OUT, SPRING_PRESS } from "@/lib/ease";
import { cn } from "@/lib/utils";

const CHECK_PATH = "M5 13l4 4L19 7";
const INDETERMINATE_PATH = "M6 12h12";

export interface CheckboxProps {
  checked: boolean;
  onCheckedChange: (checked: boolean) => void;
  disabled?: boolean;
  indeterminate?: boolean;
  label?: string;
  className?: string;
  id?: string;
  "aria-label"?: string;
  /** Associates an external message (e.g. a form error) with the control. */
  "aria-describedby"?: string;
}

export function Checkbox({
  checked,
  onCheckedChange,
  disabled,
  indeterminate,
  label,
  className,
  id: idProp,
  "aria-label": ariaLabel,
  "aria-describedby": ariaDescribedBy,
}: CheckboxProps) {
  const autoId = useId();
  const id = idProp ?? autoId;
  const reduce = useReducedMotion();
  const showMark = checked || indeterminate;
  const path = indeterminate ? INDETERMINATE_PATH : CHECK_PATH;

  return (
    <label
      htmlFor={id}
      className={cn(
        "inline-flex items-center gap-3",
        disabled ? "cursor-not-allowed" : "cursor-pointer",
        className,
      )}
    >
      <motion.button
        id={id}
        type="button"
        role="checkbox"
        aria-checked={indeterminate ? "mixed" : checked}
        aria-label={ariaLabel}
        aria-describedby={ariaDescribedBy}
        disabled={disabled}
        onClick={() => !disabled && onCheckedChange(!checked)}
        whileTap={reduce || disabled ? undefined : { scale: 0.92 }}
        transition={SPRING_PRESS}
        data-state={
          checked ? "checked" : indeterminate ? "indeterminate" : "unchecked"
        }
        className={cn(
          "inline-flex h-5 w-5 shrink-0 items-center justify-center rounded-md border-2 outline-none transition-colors duration-200",
          "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",
          showMark
            ? "border-primary bg-primary text-primary-foreground"
            : "border-muted-foreground/50 bg-background hover:border-muted-foreground",
        )}
      >
        <AnimatePresence initial={false}>
          {showMark ? (
            <motion.svg
              key={indeterminate ? "indeterminate" : "checked"}
              width="12"
              height="12"
              viewBox="0 0 24 24"
              fill="none"
              stroke="currentColor"
              strokeWidth={3}
              strokeLinecap="round"
              strokeLinejoin="round"
              initial={reduce ? { opacity: 1 } : { opacity: 0, scale: 0.5 }}
              animate={reduce ? { opacity: 1 } : { opacity: 1, scale: 1 }}
              exit={
                reduce
                  ? { opacity: 0 }
                  : { opacity: 0, scale: 0.5, filter: "blur(4px)" }
              }
              transition={
                reduce ? { duration: 0 } : { duration: 0.16, ease: EASE_OUT }
              }
              aria-hidden
            >
              <title>{indeterminate ? "Partially selected" : "Selected"}</title>
              <motion.path
                d={path}
                initial={reduce ? { pathLength: 1 } : { pathLength: 0 }}
                animate={{ pathLength: 1 }}
                transition={
                  reduce
                    ? { duration: 0 }
                    : {
                        duration: indeterminate ? 0.2 : 0.3,
                        ease: EASE_OUT,
                        delay: 0.04,
                      }
                }
              />
            </motion.svg>
          ) : null}
        </AnimatePresence>
      </motion.button>
      {label ? (
        <span className={cn("select-none text-sm text-foreground", disabled && "opacity-60")}>
          {label}
        </span>
      ) : null}
    </label>
  );
}

"use client";

import { animate, motion, MotionConfig, useReducedMotion } from "motion/react";
import { useEffect, useId, useRef, useState } from "react";
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 inline-flex h-7 w-12 shrink-0 cursor-pointer items-center px-1 rounded-full outline-none transition-colors duration-200",
            "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>
  );
}

"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 { 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-muted/60",
  outline:
    "border border-border bg-transparent text-foreground hover:bg-muted/60",
};

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(
          "inline-flex items-center justify-center font-medium select-none",
          "transition-colors",
          "disabled:pointer-events-none disabled:opacity-50",
          ripple && "relative overflow-hidden",
          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(
          "inline-flex items-center justify-center font-medium select-none",
          "transition-colors",
          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 { motion, useReducedMotion } from "motion/react";
import { forwardRef, useState } from "react";
import { EASE_IN_OUT } from "@/lib/ease";
import { cn } from "@/lib/utils";
import { Button, type ButtonProps } from "./base";

export interface MetallicButtonProps extends Omit<
  ButtonProps,
  "ripple" | "variant"
> {
  /** Stops the traveling reflection while preserving the chrome rim. */
  paused?: boolean;
}

// The rim and highlight drift separately so the material stays quiet and reflective.
const SILVER_DRIFT = {
  duration: 8,
  ease: EASE_IN_OUT,
  repeat: Infinity,
};

const CHROME_SHIMMER = {
  duration: 2.4,
  ease: EASE_IN_OUT,
};

export const MetallicButton = forwardRef<
  HTMLButtonElement,
  MetallicButtonProps
>(function MetallicButton(
  {
    size = "md",
    paused = false,
    className,
    children,
    onHoverStart,
    onHoverEnd,
    ...rest
  },
  ref,
) {
  const reduce = useReducedMotion();
  const still = paused || Boolean(reduce);
  const [hovered, setHovered] = useState(false);

  return (
    <Button
      ref={ref}
      variant="ghost"
      size={size}
      onHoverStart={(event, info) => {
        setHovered(true);
        onHoverStart?.(event, info);
      }}
      onHoverEnd={(event, info) => {
        setHovered(false);
        onHoverEnd?.(event, info);
      }}
      className={cn(
        "group relative isolate overflow-hidden border-0 bg-transparent text-foreground",
        "hover:bg-transparent hover:text-foreground",
        "focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2",
        "shadow-[0_8px_22px_rgba(0,0,0,0.16)]",
        size === "icon" && "rounded-full",
        className,
      )}
      {...rest}
    >
      <motion.span
        aria-hidden="true"
        className="pointer-events-none absolute inset-y-0 left-[-18%] z-0 w-[136%] rounded-[inherit] bg-[linear-gradient(105deg,#111_0%,#737373_14%,#fafafa_26%,#525252_38%,#0a0a0a_50%,#a3a3a3_64%,#fff_75%,#404040_87%,#111_100%)]"
        animate={still ? undefined : { x: ["0%", "13%", "0%"] }}
        transition={still ? undefined : SILVER_DRIFT}
      />

      <motion.span
        aria-hidden="true"
        className="pointer-events-none absolute inset-y-0 left-[-58%] z-[1] w-[52%] -skew-x-12 bg-[linear-gradient(90deg,transparent,rgba(255,255,255,0.5)_48%,transparent)] opacity-50 blur-[3px] mix-blend-screen"
        animate={still ? undefined : { x: hovered ? "310%" : "0%" }}
        transition={still ? undefined : CHROME_SHIMMER}
      />

      <span
        aria-hidden="true"
        className="pointer-events-none absolute inset-[2px] z-[2] rounded-[inherit] bg-background transition-colors group-hover:bg-muted/40"
      />

      <span
        aria-hidden="true"
        className="pointer-events-none absolute inset-[2px] z-[3] rounded-[inherit] shadow-[inset_0_1px_0_rgba(255,255,255,0.28),inset_0_-1px_0_rgba(0,0,0,0.16)]"
      />

      <span className="relative z-10 inline-flex items-center justify-center gap-2">
        {children}
      </span>
    </Button>
  );
});

"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>
  );
}