Agent Loading States

// 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 type { CSSProperties } from "react";

export const TEXT_SHIMMER_KEYFRAMES =
  "@keyframes beui-text-shimmer{from{background-position:200% 0}to{background-position:-200% 0}}";

export const TEXT_SHIMMER_CLASS_NAME =
  "bg-[length:200%_100%] bg-clip-text text-transparent bg-[linear-gradient(110deg,var(--muted-foreground)_30%,var(--foreground)_50%,var(--muted-foreground)_70%)]";

export function textShimmerStyle(duration: number): CSSProperties {
  return {
    animation: `beui-text-shimmer ${duration}s linear infinite`,
  };
}

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

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

"use client";
// beui.dev/components/agents/loading-states

import { AnimatePresence, motion, useReducedMotion } from "motion/react";
import { useEffect, useId, useRef, useState, type ReactNode } from "react";
import { Loader } from "@/components/motion/loader";
import { EASE_OUT, SPRING_SWAP } from "@/lib/ease";
import {
  TEXT_SHIMMER_CLASS_NAME,
  TEXT_SHIMMER_KEYFRAMES,
  textShimmerStyle,
} from "@/lib/text-shimmer";
import { cn } from "@/lib/utils";

const DEFAULT_PHRASES = [
  "Thinking",
  "Reading the context",
  "Connecting the details",
  "Forming a response",
];

const SCRAMBLE_GLYPHS = "ABCDEFGHJKLMNPQRSTUVWXYZ0123456789#%&@$?/";
const CASCADE_STAGGER = 0.025;

export type ReasoningTextVariant = "cascade" | "swap" | "scramble";

export interface ReasoningTextProps {
  /** Phrases cycled through while the agent works. */
  phrases?: string[];
  /** Animation used when the active phrase changes. */
  variant?: ReasoningTextVariant;
  /** Milliseconds each phrase remains visible. */
  interval?: number;
  /** Seconds taken for one shimmer pass. */
  shimmerDuration?: number;
  /** Optional leading visual. Defaults to a terminal-style ASCII loader. */
  indicator?: ReactNode;
  className?: string;
}

type PhraseProps = {
  phrase: string;
  reduce: boolean;
  shimmerDuration: number;
};

function CascadePhrase({
  phrase,
  reduce,
  shimmerDuration,
}: PhraseProps) {
  const text = `${phrase}…`;

  if (reduce) {
    return (
      <span
        className={cn(
          "col-start-1 row-start-1 inline-block justify-self-start whitespace-pre",
          TEXT_SHIMMER_CLASS_NAME,
        )}
        style={textShimmerStyle(shimmerDuration)}
      >
        {text}
      </span>
    );
  }

  return (
    <AnimatePresence initial={false}>
      <motion.span
        key={phrase}
        className="col-start-1 row-start-1 inline-block justify-self-start whitespace-pre"
        initial="initial"
        animate="animate"
        exit="exit"
      >
        {text.split("").map((character, characterIndex) => (
          <motion.span
            // biome-ignore lint/suspicious/noArrayIndexKey: position is the stable cascade slot identity.
            key={characterIndex}
            custom={characterIndex * CASCADE_STAGGER}
            variants={{
              initial: { opacity: 0, y: "100%" },
              animate: (delay: number) => ({
                opacity: 1,
                y: "0%",
                transition: { ...SPRING_SWAP, delay },
              }),
              exit: (delay: number) => ({
                opacity: 0,
                y: "-100%",
                transition: {
                  duration: 0.14,
                  ease: EASE_OUT,
                  delay: delay * 0.45,
                },
              }),
            }}
            className={cn(
              "inline-block whitespace-pre will-change-[opacity,transform]",
              TEXT_SHIMMER_CLASS_NAME,
            )}
            style={textShimmerStyle(shimmerDuration)}
          >
            {character}
          </motion.span>
        ))}
      </motion.span>
    </AnimatePresence>
  );
}

function SwapPhrase({ phrase, reduce, shimmerDuration }: PhraseProps) {
  return (
    <AnimatePresence initial={false}>
      <motion.span
        key={phrase}
        className={cn(
          "col-start-1 row-start-1 inline-block justify-self-start whitespace-nowrap will-change-[opacity,transform]",
          TEXT_SHIMMER_CLASS_NAME,
        )}
        style={textShimmerStyle(shimmerDuration)}
        initial={reduce ? { opacity: 0 } : { opacity: 0, y: 3 }}
        animate={reduce ? { opacity: 1 } : { opacity: 1, y: 0 }}
        exit={reduce ? { opacity: 0 } : { opacity: 0, y: -3 }}
        transition={{
          duration: reduce ? 0.12 : 0.2,
          ease: EASE_OUT,
        }}
      >
        {phrase}…
      </motion.span>
    </AnimatePresence>
  );
}

function ScramblePhrase({
  phrase,
  reduce,
  shimmerDuration,
}: PhraseProps) {
  const target = `${phrase}…`;
  const [display, setDisplay] = useState(target);
  const mounted = useRef(false);

  useEffect(() => {
    if (!mounted.current) {
      mounted.current = true;
      return;
    }

    if (reduce) {
      setDisplay(target);
      return;
    }

    const characters = target.split("");
    const startedAt = performance.now();
    const duration = Math.min(760, Math.max(420, characters.length * 32));
    let frame = 0;
    let lastUpdate = 0;

    const animate = (now: number) => {
      if (now - lastUpdate >= 40) {
        lastUpdate = now;
        const progress = Math.min((now - startedAt) / duration, 1);
        const settled = Math.floor(progress * characters.length);

        setDisplay(
          characters
            .map((character, characterIndex) => {
              if (characterIndex < settled || character === " ") {
                return character;
              }
              return SCRAMBLE_GLYPHS[
                Math.floor(Math.random() * SCRAMBLE_GLYPHS.length)
              ];
            })
            .join(""),
        );
      }

      if (now - startedAt < duration) {
        frame = requestAnimationFrame(animate);
      } else {
        setDisplay(target);
      }
    };

    frame = requestAnimationFrame(animate);
    return () => cancelAnimationFrame(frame);
  }, [reduce, target]);

  return (
    <span
      className={cn(
        "col-start-1 row-start-1 inline-block justify-self-start whitespace-pre font-mono tabular-nums",
        TEXT_SHIMMER_CLASS_NAME,
      )}
      style={textShimmerStyle(shimmerDuration)}
    >
      {display}
    </span>
  );
}

export function ReasoningText({
  phrases = DEFAULT_PHRASES,
  variant = "cascade",
  interval = 1800,
  shimmerDuration = 2.2,
  indicator,
  className,
}: ReasoningTextProps) {
  const reduce = useReducedMotion() ?? false;
  const [index, setIndex] = useState(0);
  const statusId = useId();
  const safePhrases = phrases.length > 0 ? phrases : DEFAULT_PHRASES;
  const phrase = safePhrases[index % safePhrases.length];
  const longestPhrase = safePhrases.reduce((longest, current) =>
    current.length > longest.length ? current : longest,
  );
  const phraseProps = { phrase, reduce, shimmerDuration };

  useEffect(() => {
    if (safePhrases.length < 2) return;

    const timer = window.setInterval(() => {
      setIndex((current) => (current + 1) % safePhrases.length);
    }, Math.max(600, interval));

    return () => window.clearInterval(timer);
  }, [interval, safePhrases.length]);

  return (
    <>
      <style>{TEXT_SHIMMER_KEYFRAMES}</style>
      <span
        role="status"
        aria-live="polite"
        aria-labelledby={statusId}
        className={cn(
          "inline-flex items-center gap-2 text-sm font-medium text-muted-foreground",
          className,
        )}
      >
        <span aria-hidden="true" className="inline-flex size-3 shrink-0 items-center justify-center">
          {indicator ?? (
            <Loader
              variant="ascii-line"
              size={14}
              speed={0.8}
              label="Reasoning"
            />
          )}
        </span>

        <span aria-hidden="true" className="grid overflow-hidden text-left">
          <span className="invisible col-start-1 row-start-1 whitespace-nowrap">
            {longestPhrase}…
          </span>
          {variant === "cascade" ? (
            <CascadePhrase {...phraseProps} />
          ) : variant === "scramble" ? (
            <ScramblePhrase {...phraseProps} />
          ) : (
            <SwapPhrase {...phraseProps} />
          )}
        </span>

        <span id={statusId} className="sr-only">
          {phrase}
        </span>
      </span>
    </>
  );
}

"use client";

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

import type { CSSProperties } from "react";

export const TEXT_SHIMMER_KEYFRAMES =
  "@keyframes beui-text-shimmer{from{background-position:200% 0}to{background-position:-200% 0}}";

export const TEXT_SHIMMER_CLASS_NAME =
  "bg-[length:200%_100%] bg-clip-text text-transparent bg-[linear-gradient(110deg,var(--muted-foreground)_30%,var(--foreground)_50%,var(--muted-foreground)_70%)]";

export function textShimmerStyle(duration: number): CSSProperties {
  return {
    animation: `beui-text-shimmer ${duration}s linear infinite`,
  };
}

// beui.dev/components/agents/loading-states
import type { ReactNode } from "react";
import { TextShimmer } from "@/components/motion/text-shimmer";
import { cn } from "@/lib/utils";

export interface ThinkingShimmerProps {
  /** Loading message shown to the user. */
  children?: ReactNode;
  /** Seconds taken for one shimmer pass. */
  duration?: number;
  className?: string;
}

export function ThinkingShimmer({
  children = "Thinking…",
  duration = 1.8,
  className,
}: ThinkingShimmerProps) {
  return (
    <TextShimmer
      as="span"
      duration={duration}
      className={cn("font-medium", className)}
    >
      {children}
    </TextShimmer>
  );
}

import { cn } from "@/lib/utils";
import type { ElementType, ReactNode } from "react";
import {
  TEXT_SHIMMER_CLASS_NAME,
  TEXT_SHIMMER_KEYFRAMES,
  textShimmerStyle,
} from "@/lib/text-shimmer";

export interface TextShimmerProps {
  children: ReactNode;
  as?: ElementType;
  duration?: number;
  className?: string;
}

export function TextShimmer({ children, as: Comp = "span", duration = 2.5, className }: TextShimmerProps) {
  return (
    <>
      <style>
        {TEXT_SHIMMER_KEYFRAMES}
      </style>
      <Comp
        style={textShimmerStyle(duration)}
        className={cn(
          "inline-block",
          TEXT_SHIMMER_CLASS_NAME,
          className,
        )}
      >
        {children}
      </Comp>
    </>
  );
}