Popover

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

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

// 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;

"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/popover

import {
  animate,
  type MotionValue,
  useMotionValue,
  useMotionValueEvent,
  useReducedMotion,
} from "motion/react";
import {
  cloneElement,
  createContext,
  isValidElement,
  type ReactElement,
  type ReactNode,
  type Ref,
  useCallback,
  useContext,
  useEffect,
  useId,
  useLayoutEffect,
  useMemo,
  useRef,
  useState,
} from "react";
import { createPortal } from "react-dom";
import { usePopoverPortalPosition } from "@/components/motion/popover-position";
import { cn } from "@/lib/utils";

type Side = "top" | "bottom";
type Align = "start" | "center" | "end";
type TriggerMode = "click" | "hover";

// This morph needs less bounce than layout motion: too much overshoot makes
// the liquid neck balloon past the final panel edges.
const GOO_OPEN_SPRING = {
  type: "spring",
  visualDuration: 0.3,
  bounce: 0.15,
} as const;
const GOO_CLOSE_SPRING = {
  type: "spring",
  visualDuration: 0.21,
  bounce: 0.15,
} as const;
const HOVER_CLOSE_DELAY = 120;
const CIRCLE_KAPPA = 0.5523;

const lerp = (a: number, b: number, t: number) => a + (b - a) * t;

interface Rect {
  x: number;
  y: number;
  w: number;
  h: number;
  r: number;
}
interface Geo {
  layerW: number;
  layerH: number;
  left: number;
  top: number;
  trigger: Rect;
  panel: Rect;
}

// Trigger rect and panel rect in a shared local coordinate box.
function buildGeo(
  tW: number,
  tH: number,
  cW: number,
  cH: number,
  side: Side,
  align: Align,
  gap: number,
  panelRadius: number,
): Geo {
  const py = side === "bottom" ? tH + gap : -(gap + cH);
  const px = align === "start" ? 0 : align === "end" ? tW - cW : (tW - cW) / 2;

  const left = Math.min(0, px);
  const top = Math.min(0, py);
  const layerW = Math.max(tW, px + cW) - left;
  const layerH = Math.max(tH, py + cH) - top;

  const triggerRadius = Math.min(tH / 2, panelRadius);

  return {
    layerW,
    layerH,
    left,
    top,
    trigger: { x: -left, y: -top, w: tW, h: tH, r: triggerRadius },
    panel: { x: px - left, y: py - top, w: cW, h: cH, r: panelRadius },
  };
}

function rectAtProgress(geo: Geo, progress: number): Rect {
  const trigger = geo.trigger;
  const panel = geo.panel;

  return {
    x: lerp(trigger.x, panel.x, progress),
    y: lerp(trigger.y, panel.y, progress),
    w: lerp(trigger.w, panel.w, progress),
    h: lerp(trigger.h, panel.h, progress),
    r: lerp(trigger.r, panel.r, progress),
  };
}

function insetFor(rect: Rect, layerW: number, layerH: number) {
  const top = rect.y;
  const right = layerW - (rect.x + rect.w);
  const bottom = layerH - (rect.y + rect.h);
  const left = rect.x;
  return `inset(${top}px ${right}px ${bottom}px ${left}px round ${rect.r}px)`;
}

function roundedRectShape(rect: Rect) {
  const radius = Math.max(0, Math.min(rect.r, rect.w / 2, rect.h / 2));
  const control = radius * CIRCLE_KAPPA;
  const x1 = rect.x;
  const y1 = rect.y;
  const x2 = rect.x + rect.w;
  const y2 = rect.y + rect.h;
  const px = (value: number) => `${value.toFixed(3)}px`;

  return (
    `shape(from ${px(x1 + radius)} ${px(y1)}, ` +
    `line to ${px(x2 - radius)} ${px(y1)}, ` +
    `curve to ${px(x2)} ${px(y1 + radius)} with ${px(x2 - radius + control)} ${px(y1)} / ${px(x2)} ${px(y1 + radius - control)}, ` +
    `line to ${px(x2)} ${px(y2 - radius)}, ` +
    `curve to ${px(x2 - radius)} ${px(y2)} with ${px(x2)} ${px(y2 - radius + control)} / ${px(x2 - radius + control)} ${px(y2)}, ` +
    `line to ${px(x1 + radius)} ${px(y2)}, ` +
    `curve to ${px(x1)} ${px(y2 - radius)} with ${px(x1 + radius - control)} ${px(y2)} / ${px(x1)} ${px(y2 - radius + control)}, ` +
    `line to ${px(x1)} ${px(y1 + radius)}, ` +
    `curve to ${px(x1 + radius)} ${px(y1)} with ${px(x1)} ${px(y1 + radius - control)} / ${px(x1 + radius - control)} ${px(y1)}, ` +
    "close)"
  );
}

function clipForProgress(geo: Geo, progress: number, supportsShape: boolean) {
  const rect = rectAtProgress(geo, progress);
  return supportsShape
    ? roundedRectShape(rect)
    : insetFor(rect, geo.layerW, geo.layerH);
}

interface PopoverContextValue {
  open: boolean;
  setOpen: (open: boolean) => void;
  toggle: () => void;
  openHover: () => void;
  scheduleClose: () => void;
  triggerMode: TriggerMode;
  side: Side;
  align: Align;
  gap: number;
  panelRadius: number;
  gooStrength: number;
  reduce: boolean;
  gooId: string;
  contentId: string;
  progress: MotionValue<number>;
  triggerRef: React.MutableRefObject<HTMLElement | null>;
  contentRef: React.MutableRefObject<HTMLDivElement | null>;
}

const PopoverContext = createContext<PopoverContextValue | null>(null);

function usePopoverContext(component: string) {
  const ctx = useContext(PopoverContext);
  if (!ctx) throw new Error(`${component} must be used within <Popover>`);
  return ctx;
}

export interface PopoverProps {
  children: ReactNode;
  /** Controlled open state. */
  open?: boolean;
  /** Uncontrolled initial open state. */
  defaultOpen?: boolean;
  onOpenChange?: (open: boolean) => void;
  /** How the popover is summoned. Default "click". */
  trigger?: TriggerMode;
  /** Which side of the trigger the panel oozes out of. Default "bottom". */
  side?: Side;
  /** Alignment along the trigger's edge. Default "center". */
  align?: Align;
  /** Gap between trigger and panel, in px — the length of the gooey neck. Default 14. */
  sideOffset?: number;
  /** Corner radius of the open panel, in px. Default 16. */
  panelRadius?: number;
  /** Blur radius feeding the goo filter — higher melts more. Default 8. */
  gooStrength?: number;
  className?: string;
}

export function Popover({
  children,
  open: controlledOpen,
  defaultOpen = false,
  onOpenChange,
  trigger = "click",
  side = "bottom",
  align = "center",
  sideOffset = 14,
  panelRadius = 16,
  gooStrength = 8,
  className,
}: PopoverProps) {
  const reduce = useReducedMotion() ?? false;
  const gooId = useId().replace(/:/g, "");
  const contentId = useId();
  const rootRef = useRef<HTMLDivElement>(null);
  const triggerRef = useRef<HTMLElement | null>(null);
  const contentRef = useRef<HTMLDivElement | null>(null);
  const closeTimer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const progress = useMotionValue(defaultOpen ? 1 : 0);

  const [internalOpen, setInternalOpen] = useState(defaultOpen);
  const controlled = controlledOpen !== undefined;
  const open = controlled ? controlledOpen : internalOpen;

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

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

  const openHover = useCallback(() => {
    cancelClose();
    setOpen(true);
  }, [cancelClose, setOpen]);

  const scheduleClose = useCallback(() => {
    cancelClose();
    closeTimer.current = setTimeout(() => setOpen(false), HOVER_CLOSE_DELAY);
  }, [cancelClose, setOpen]);

  const toggle = useCallback(() => setOpen(!open), [setOpen, open]);

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

  useEffect(() => {
    const animation = animate(
      progress,
      open ? 1 : 0,
      reduce
        ? { duration: 0 }
        : open
          ? GOO_OPEN_SPRING
          : GOO_CLOSE_SPRING,
    );
    return () => animation.stop();
  }, [open, progress, reduce]);

  useEffect(() => {
    if (!open) return;
    const onKey = (e: KeyboardEvent) => e.key === "Escape" && setOpen(false);
    // The panel is portalled, so both trees participate in outside detection.
    const onPointer = (e: PointerEvent) => {
      const target = e.target as Node;
      if (
        rootRef.current &&
        !rootRef.current.contains(target) &&
        !contentRef.current?.contains(target)
      )
        setOpen(false);
    };
    window.addEventListener("keydown", onKey);
    if (trigger === "click") window.addEventListener("pointerdown", onPointer);
    return () => {
      window.removeEventListener("keydown", onKey);
      window.removeEventListener("pointerdown", onPointer);
    };
  }, [open, setOpen, trigger]);

  const ctx = useMemo<PopoverContextValue>(
    () => ({
      open,
      setOpen,
      toggle,
      openHover,
      scheduleClose,
      triggerMode: trigger,
      side,
      align,
      gap: sideOffset,
      panelRadius,
      gooStrength,
      reduce,
      gooId,
      contentId,
      progress,
      triggerRef,
      contentRef,
    }),
    [
      open,
      setOpen,
      toggle,
      openHover,
      scheduleClose,
      trigger,
      side,
      align,
      sideOffset,
      panelRadius,
      gooStrength,
      reduce,
      gooId,
      contentId,
      progress,
    ],
  );

  const hoverHandlers =
    trigger === "hover"
      ? { onMouseEnter: openHover, onMouseLeave: scheduleClose }
      : {};

  return (
    <PopoverContext.Provider value={ctx}>
      <div
        ref={rootRef}
        className={cn("relative inline-flex isolate", className)}
        {...hoverHandlers}
      >
        {children}
      </div>
    </PopoverContext.Provider>
  );
}

function mergeRefs<T>(...refs: Array<Ref<T> | undefined>) {
  return (node: T | null) => {
    for (const ref of refs) {
      if (typeof ref === "function") ref(node);
      else if (ref && typeof ref === "object")
        (ref as React.MutableRefObject<T | null>).current = node;
    }
  };
}

export interface PopoverTriggerProps {
  /** A single focusable element (e.g. a Button) that opens the popover. */
  children: ReactElement;
}

export function PopoverTrigger({ children }: PopoverTriggerProps) {
  const ctx = usePopoverContext("PopoverTrigger");

  if (!isValidElement(children)) return children;

  const child = children as ReactElement<Record<string, unknown>>;
  const childProps = child.props;
  const childRef = (childProps as { ref?: Ref<HTMLElement> }).ref;

  const compose =
    (name: string, handler: () => void) =>
    (event: { defaultPrevented?: boolean }) => {
      (childProps[name] as ((e: unknown) => void) | undefined)?.(event);
      if (!event.defaultPrevented) handler();
    };

  const handlers: Record<string, unknown> =
    ctx.triggerMode === "hover"
      ? {
          onFocus: compose("onFocus", ctx.openHover),
          onBlur: compose("onBlur", ctx.scheduleClose),
        }
      : { onClick: compose("onClick", ctx.toggle) };

  return cloneElement(child, {
    ...handlers,
    ref: mergeRefs(childRef, (node: HTMLElement | null) => {
      ctx.triggerRef.current = node;
    }),
    // Above the goo layer (z-[-1]) so the neck reads behind it.
    className: cn("relative z-0", childProps.className as string | undefined),
    "aria-haspopup": "dialog",
    "aria-expanded": ctx.open,
    "aria-controls": ctx.open ? ctx.contentId : undefined,
    "data-state": ctx.open ? "open" : "closed",
  });
}

const ALIGN_ORIGIN: Record<Align, string> = {
  start: "left",
  center: "center",
  end: "right",
};

export interface PopoverContentProps {
  children: ReactNode;
  className?: string;
}

export function PopoverContent({ children, className }: PopoverContentProps) {
  const ctx = usePopoverContext("PopoverContent");
  const [portalReady, setPortalReady] = useState(false);
  const {
    side,
    align,
    gap,
    panelRadius,
    gooStrength,
    reduce,
    gooId,
    contentId,
    progress,
    triggerRef,
    contentRef,
    open,
    triggerMode,
    openHover,
    scheduleClose,
  } = ctx;

  const measureRef = contentRef;
  const blobRef = useRef<HTMLDivElement>(null);
  const clipRef = useRef<HTMLDivElement>(null);
  const geoRef = useRef<Geo | null>(null);
  const supportsShapeRef = useRef(false);
  const layout = usePopoverPortalPosition(
    triggerRef,
    measureRef,
    portalReady,
  );

  useEffect(() => setPortalReady(true), []);

  const geo = useMemo(
    () =>
      buildGeo(
        layout?.trigger.width ?? 0,
        layout?.trigger.height ?? 0,
        layout?.content.width ?? 0,
        layout?.content.height ?? 0,
        side,
        align,
        gap,
        panelRadius,
      ),
    [layout, side, align, gap, panelRadius],
  );

  // Morph the same clip on the goo body and the content, so the whole popover
  // oozes as one and the text reveals with it.
  const render = useCallback((g: Geo | null, p: number) => {
    if (!g || g.layerW === 0) return;
    const clip = clipForProgress(g, p, supportsShapeRef.current);
    if (blobRef.current) blobRef.current.style.clipPath = clip;
    if (clipRef.current) clipRef.current.style.clipPath = clip;
  }, []);

  useLayoutEffect(() => {
    supportsShapeRef.current =
      typeof CSS !== "undefined" &&
      typeof CSS.supports === "function" &&
      CSS.supports(
        "clip-path",
        "shape(from 0px 0px, line to 1px 1px, close)",
      );
    geoRef.current = geo;
    render(geo, progress.get());
  }, [geo, progress, render]);

  useMotionValueEvent(progress, "change", (p) => render(geoRef.current, p));

  const hoverHandlers =
    triggerMode === "hover"
      ? { onMouseEnter: openHover, onMouseLeave: scheduleClose }
      : {};
  const maskId = `${gooId}-trigger-cutout`;

  // Match the server and first client render, then attach the portal after
  // hydration. This preserves SSR without regenerating the page on the client.
  if (!portalReady) return null;

  return createPortal(
    <div
      data-popover-portal=""
      className="pointer-events-none fixed left-0 top-0 z-[9999] isolate size-0"
      style={{
        visibility: layout ? "visible" : "hidden",
        transform: `translate3d(${layout?.trigger.left ?? 0}px, ${layout?.trigger.top ?? 0}px, 0)`,
      }}
    >
      {/* Goo filter: blur, sharpen the alpha back into solid shapes, then lay
          the crisp original on top so blobs merge with liquid edges. The mask
          removes the real trigger area so this top-layer copy never covers its
          label or focus ring. */}
      <svg aria-hidden width="0" height="0" className="absolute">
        <title>Popover visual effects</title>
        <defs>
          <filter id={gooId} x="-50%" y="-50%" width="200%" height="200%">
            <feGaussianBlur
              in="SourceGraphic"
              stdDeviation={gooStrength}
              result="blur"
            />
            <feColorMatrix
              in="blur"
              mode="matrix"
              values="1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 22 -10"
              result="goo"
            />
            <feComposite in="SourceGraphic" in2="goo" operator="atop" />
          </filter>
          <mask
            id={maskId}
            maskUnits="userSpaceOnUse"
            maskContentUnits="userSpaceOnUse"
            x={0}
            y={0}
            width={geo.layerW}
            height={geo.layerH}
          >
            <rect width={geo.layerW} height={geo.layerH} fill="white" />
            <rect
              x={geo.trigger.x}
              y={geo.trigger.y}
              width={geo.trigger.w}
              height={geo.trigger.h}
              rx={geo.trigger.r}
              fill="black"
            />
          </mask>
        </defs>
      </svg>

      {/* Goo body: static trigger pill + morphing blob. */}
      <div
        aria-hidden
        className="pointer-events-none absolute z-[-1]"
        style={{
          left: geo.left,
          top: geo.top,
          width: geo.layerW,
          height: geo.layerH,
          filter: reduce ? undefined : `url(#${gooId})`,
          mask: `url(#${maskId})`,
          WebkitMask: `url(#${maskId})`,
        }}
      >
        <div
          className="absolute bg-popover"
          style={{
            left: geo.trigger.x,
            top: geo.trigger.y,
            width: geo.trigger.w,
            height: geo.trigger.h,
            borderRadius: geo.trigger.r,
          }}
        />
        <div
          ref={blobRef}
          className="absolute inset-0 bg-popover"
          style={{
            clipPath: clipForProgress(geo, progress.get(), false),
          }}
        />
      </div>

      {/* Content is clipped by the same morph. The portal wrapper stays
          pointer-transparent; only the fully open panel accepts interaction. */}
      <div
        className="pointer-events-none absolute z-10"
        style={{
          left: geo.left,
          top: geo.top,
          width: geo.layerW,
          height: geo.layerH,
        }}
      >
        <div
          ref={clipRef}
          inert={!open}
          className="absolute inset-0"
          style={{
            clipPath: clipForProgress(geo, progress.get(), false),
            pointerEvents: open ? "auto" : "none",
          }}
        >
          <div
            ref={measureRef}
            id={contentId}
            role="dialog"
            {...hoverHandlers}
            style={{
              position: "absolute",
              left: geo.panel.x,
              top: geo.panel.y,
              transformOrigin: `${ALIGN_ORIGIN[align]} ${side === "bottom" ? "top" : "bottom"}`,
            }}
            className={cn(
              "w-max max-w-[min(92vw,20rem)] p-4 text-popover-foreground outline-none",
              className,
            )}
          >
            {children}
          </div>
        </div>
      </div>
    </div>,
    document.body,
  );
}

"use client";

import {
  type MutableRefObject,
  useCallback,
  useLayoutEffect,
  useState,
} from "react";

export type PortalLayout = {
  trigger: {
    left: number;
    top: number;
    width: number;
    height: number;
  };
  content: {
    width: number;
    height: number;
  };
};

function sameLayout(a: PortalLayout | null, b: PortalLayout) {
  return (
    a?.trigger.left === b.trigger.left &&
    a.trigger.top === b.trigger.top &&
    a.trigger.width === b.trigger.width &&
    a.trigger.height === b.trigger.height &&
    a.content.width === b.content.width &&
    a.content.height === b.content.height
  );
}

/** Measures a trigger and portalled panel in viewport coordinates. */
export function usePopoverPortalPosition<
  TriggerElement extends HTMLElement,
  ContentElement extends HTMLElement,
>(
  triggerRef: MutableRefObject<TriggerElement | null>,
  contentRef: MutableRefObject<ContentElement | null>,
  active: boolean,
) {
  const [layout, setLayout] = useState<PortalLayout | null>(null);

  const update = useCallback(() => {
    const trigger = triggerRef.current;
    const content = contentRef.current;
    if (!trigger || !content) return;

    const rect = trigger.getBoundingClientRect();
    const next: PortalLayout = {
      trigger: {
        left: rect.left,
        top: rect.top,
        width: rect.width,
        height: rect.height,
      },
      content: {
        width: content.offsetWidth,
        height: content.offsetHeight,
      },
    };
    setLayout((current) => (sameLayout(current, next) ? current : next));
  }, [contentRef, triggerRef]);

  useLayoutEffect(() => {
    update();
    if (!active) return;

    const trigger = triggerRef.current;
    const content = contentRef.current;
    const observer = new ResizeObserver(update);
    if (trigger) observer.observe(trigger);
    if (content) observer.observe(content);

    window.addEventListener("scroll", update, true);
    window.addEventListener("resize", update);
    return () => {
      observer.disconnect();
      window.removeEventListener("scroll", update, true);
      window.removeEventListener("resize", update);
    };
  }, [active, contentRef, triggerRef, update]);

  return layout;
}

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 {
  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-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(
          "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>
    );
  },
);