Loading State

1"use client";
2 
3import { useEffect, useState } from "react";
4import { cn } from "@/lib/utils";
5 
6const KEYFRAMES = `
7@keyframes su-pixel-on { 0%, 100% { opacity: 0.15 } 40% { opacity: 1 } }
8@keyframes su-shimmer-text { 0% { background-position: 200% 0 } 100% { background-position: -200% 0 } }
9`;
10 
11const chevron = Array.from({ length: 9 }, (_, i) => {
12  const r = Math.floor(i / 3),
13    c = i % 3;
14  return (c + Math.abs(r - 1)) * 90;
15});
16 
17const ORBIT_ORDER = [0, 1, 2, 5, 8, 7, 6, 3];
18const orbit = Array.from({ length: 9 }, (_, i) => {
19  const k = ORBIT_ORDER.indexOf(i);
20  return k === -1 ? null : k * 110;
21});
22 
23export type LoadingStateVariant = "Drive" | "Dots" | "Orbit";
24 
25const PATTERNS: Record<
26  LoadingStateVariant,
27  { delays: (number | null)[]; dur: number; round: boolean }
28> = {
29  Drive: { delays: chevron, dur: 650, round: false },
30  Dots: { delays: chevron, dur: 650, round: true },
31  Orbit: { delays: orbit, dur: 950, round: false },
32};
33 
34function useElapsed() {
35  const [ds, setDs] = useState(0);
36  useEffect(() => {
37    const t = setInterval(() => setDs((d) => d + 1), 100);
38    return () => clearInterval(t);
39  }, []);
40  const total = ds / 10;
41  if (total < 60) return `${total.toFixed(1)}s`;
42  return `${Math.floor(total / 60)}m ${(total % 60).toFixed(1)}s`;
43}
44 
45export interface LoadingStateProps {
46  label?: string;
47  variant?: LoadingStateVariant;
48  className?: string;
49}
50 
51export function LoadingState({
52  label = "Churning",
53  variant = "Drive",
54  className,
55}: LoadingStateProps) {
56  const elapsed = useElapsed();
57  const { delays, dur, round } = PATTERNS[variant] ?? PATTERNS.Drive;
58 
59  return (
60    <div
61      className={cn(
62        "flex w-fit items-center gap-2.5 text-neutral-900 dark:text-neutral-100",
63        className,
64      )}
65    >
66      <style dangerouslySetInnerHTML={{ __html: KEYFRAMES }} />
67 
68      <span aria-hidden className="grid grid-cols-[repeat(3,4px)] gap-[1.5px]">
69        {delays.map((d, i) => (
70          <span
71            key={i}
72            className={cn(
73              "size-[4px] bg-current motion-reduce:!animate-none",
74              round ? "rounded-full" : "rounded-[1px]",
75            )}
76            style={{
77              opacity: d === null ? 0.07 : 0.15,
78              animation:
79                d === null
80                  ? "none"
81                  : `su-pixel-on ${dur}ms ease-in-out ${d}ms infinite`,
82            }}
83          />
84        ))}
85      </span>
86 
87      <span
88// … truncated