Fracture

"use client";

import * as React from "react";

import { cn } from "@/lib/utils";
import { useReducedMotion } from "@/registry/default/hooks/use-reduced-motion/use-reduced-motion";

export interface FractureColors {
  /** Color of the ember-red channel ghost. */
  ember?: string;
  /** Color of the deep-violet channel ghost. */
  violet?: string;
  /** Color of the base (undisplaced) text. */
  base?: string;
  /** Color of the spark-fleck particles fired at each shear line. */
  spark?: string;
}

export interface FractureProps extends Omit<React.ComponentPropsWithoutRef<"span">, "children"> {
  /** The text to render and glitch. */
  children: string;
  /** Element tag rendered. @default "span" */
  as?: "span" | "div" | "p" | "h1" | "h2" | "h3";
  /**
   * What fires the glitch. "always" loops continuously (still bursty, not
   * nonstop noise — `cadence` sets the gap between bursts); "hover" bursts
   * rapidly while the pointer is over the text; "interval" bursts on a timer
   * even without interaction. @default "hover"
   */
  trigger?: "always" | "hover" | "interval";
  /** Channel-split offset and slice strength, 0-1. @default 0.6 */
  intensity?: number;
  /** Seconds between bursts for "always"/"interval" triggers. @default 3.2 */
  cadence?: number;
  /** Seconds a single burst lasts. @default 0.5 */
  burstDuration?: number;
  /** Ghost-layer, base, and spark colors. */
  colors?: FractureColors;
  /** Freeze the animation. */
  paused?: boolean;
}

const DEFAULT_COLORS: Required<FractureColors> = {
  ember: "#c1121f",
  violet: "#5a189a",
  base: "#fdf1e3",
  spark: "#ff6b35",
};

/**
 * Fracture — text shears under stress: ember-red and deep-violet channel
 * ghosts jump apart along clip-path slices, with a spark-fleck particle
 * firing at each shear line. Reads as metal fracturing, not a VHS dropout.
 * Freezes static under reduced motion.
 */
export function Fracture({
  children,
  as = "span",
  trigger = "hover",
  intensity = 0.6,
  cadence = 3.2,
  burstDuration = 0.5,
  colors,
  paused = false,
  className,
  style,
  ...props
}: FractureProps) {
  const reducedMotion = useReducedMotion();
  const c = { ...DEFAULT_COLORS, ...colors };
  const Tag = as;
  const [burst, setBurst] = React.useState(false);

  React.useEffect(() => {
    if (reducedMotion || trigger !== "interval" || paused) return;
    const cadenceMs = Math.max(cadence, 0.2) * 1000;
    const burstMs = Math.max(burstDuration, 0.05) * 1000;
    let timeoutId: ReturnType<typeof setTimeout>;
    const intervalId = setInterval(() => {
      setBurst(true);
      timeoutId = setTimeout(() => setBurst(false), burstMs);
    }, cadenceMs);
    return () => {
      clearInterval(intervalId);
      clearTimeout(timeoutId);
    };
  }, [trigger, cadence, burstDuration, reducedMotion, paused]);

  if (reducedMotion) {
    return (
      <Tag className={cn("inline-block", className)} style={{ color: c.base, ...style }} {...props}>
        {children}
      </Tag>
    );
  }

  return (
    <Tag
      data-crucible="fracture"
      data-trigger={trigger}
      data-burst={burst ? "" : undefined}
      aria-label={children}
      className={cn("relative isolate inline-block", className)}
      style={
        {
          "--fracture-intensity": intensity,
          "--fracture-cadence": `${cadence}s`,
          "--fracture-burst-duration": `${burstDuration}s`,
          ...(paused ? { "--fracture-play": "paused" } : {}),
          color: c.base,
          ...style,
        } as React.CSSProperties
      }
      {...props}
    >
      <style>{`
        /* Ghost layers only: sliced, displaced, and visible solely mid-burst. */
        @keyframes crucible-fracture-glitch {
          0%   { opacity: 0; transform: translate3d(0, 0, 0); clip-path: inset(0 0 0 0); }
          4%   { opacity: 1; transform: translate3d(calc(var(--fracture-intensity) * var(--fracture-sign, 1) * -9px), calc(var(--fracture-intensity) * 2px), 0); clip-path: inset(6% 0 78% 0); }
          8%   { opacity: 1; transform: translate3d(calc(var(--fracture-intensity) * var(--fracture-sign, 1) * 7px), 0, 0); clip-path: inset(42% 0 18% 0); }
          12%  { opacity: 1; transform: translate3d(calc(var(--fracture-intensity) * var(--fracture-sign, 1) * -5px), calc(var(--fracture-intensity) * -2px), 0); clip-path: inset(70% 0 3% 0); }
          17%  { opacity: 0; transform: translate3d(0, 0, 0); clip-path: inset(0 0 0 0); }
          100% { opacity: 0; transform: translate3d(0, 0, 0); clip-path: inset(0 0 0 0); }
        }
        /* Base layer stays whole and legible: a 1-2px stress jitter, no slicing. */
        @keyframes crucible-fracture-jitter {
          0%   { transform: translate3d(0, 0, 0); }
          4%   { transform: translate3d(calc(var(--fracture-intensity) * -1.5px), calc(var(--fracture-intensity) * 1px), 0); }
          8%   { transform: translate3d(calc(var(--fracture-intensity) * 1.5px), 0, 0); }
          12%  { transform: translate3d(calc(var(--fracture-intensity) * -1px), calc(var(--fracture-intensity) * -1px), 0); }
          17%  { transform: translate3d(0, 0, 0); }
          100% { transform: translate3d(0, 0, 0); }
        }
        @keyframes crucible-fracture-spark {
          0%, 5% { opacity: 0; transform: scale(0.4); }
          7%     { opacity: 1; transform: scale(1.2); }
          11%    { opacity: 0; transform: scale(0.6); }
          100%   { opacity: 0; }
        }
        [data-crucible="fracture"] .fracture-layer { will-change: transform, clip-path, opacity; opacity: 0; }
        [data-crucible="fracture"] .fracture-base { will-change: transform; }
        [data-crucible="fracture"] .fracture-ember { --fracture-sign: -1; mix-blend-mode: screen; }
        [data-crucible="fracture"] .fracture-violet { --fracture-sign: 1; mix-blend-mode: screen; }
        [data-crucible="fracture"] .fracture-spark { opacity: 0; }

        [data-crucible="fracture"][data-trigger="always"] .fracture-layer {
          animation: crucible-fracture-glitch var(--fracture-cadence) steps(1, jump-end) infinite;
          animation-play-state: var(--fracture-play, running);
        }
        [data-crucible="fracture"][data-trigger="always"] .fracture-base {
          animation: crucible-fracture-jitter var(--fracture-cadence) steps(1, jump-end) infinite;
          animation-play-state: var(--fracture-play, running);
        }
        [data-crucible="fracture"][data-trigger="always"] .fracture-spark {
          animation: crucible-fracture-spark var(--fracture-cadence) steps(1, jump-end) infinite;
          animation-play-state: var(--fracture-play, running);
        }

        [data-crucible="fracture"][data-trigger="hover"] .fracture-layer,
        [data-crucible="fracture"][data-trigger="hover"] .fracture-base,
        [data-crucible="fracture"][data-trigger="hover"] .fracture-spark {
          animation: none;
        }
        [data-crucible="fracture"][data-trigger="hover"]:hover .fracture-layer {
          animation: crucible-fracture-glitch var(--fracture-burst-duration) steps(1, jump-end) infinite;
          animation-play-state: var(--fracture-play, running);
        }
        [data-crucible="fracture"][data-trigger="hover"]:hover .fracture-base {
          animation: crucible-fracture-jitter var(--fracture-burst-duration) steps(1, jump-end) infinite;
          animation-play-state: var(--fracture-play, running);
        }
        [data-crucible="fracture"][data-trigger="hover"]:hover .fracture-spark {
          animation: crucible-fracture-spark var(--fracture-burst-duration) steps(1, jump-end) infinite;
          animation-play-state: var(--fracture-play, running);
        }

        [data-crucible="fracture"][data-trigger="interval"] .fracture-layer,
        [data-crucible="fracture"][data-trigger="interval"] .fracture-base,
        [data-crucible="fracture"][data-trigger="interval"] .fracture-spark {
          animation: none;
        }
        [data-crucible="fracture"][data-trigger="interval"][data-burst] .fracture-layer {
          animation: crucible-fracture-glitch var(--fracture-burst-duration) steps(1, jump-end) 1;
        }
        [data-crucible="fracture"][data-trigger="interval"][data-burst] .fracture-base {
          animation: crucible-fracture-jitter var(--fracture-burst-duration) steps(1, jump-end) 1;
        }
        [data-crucible="fracture"][data-trigger="interval"][data-burst] .fracture-spark {
          animation: crucible-fracture-spark var(--fracture-burst-duration) steps(1, jump-end) 1;
        }

        @media (prefers-reduced-motion: reduce) {
          [data-crucible="fracture"] .fracture-layer,
          [data-crucible="fracture"] .fracture-base,
          [data-crucible="fracture"] .fracture-spark {
            animation: none !important;
          }
        }
      `}</style>
      <span aria-hidden className="fracture-base relative z-10">
        {children}
      </span>
      <span
        aria-hidden
        className="fracture-layer fracture-ember pointer-events-none absolute inset-0 select-none"
        style={{ color: c.ember }}
      >
        {children}
      </span>
      <span
        aria-hidden
        className="fracture-layer fracture-violet pointer-events-none absolute inset-0 select-none"
        style={{ color: c.violet }}
      >
        {children}
      </span>
      <span
        aria-hidden
        className="fracture-spark pointer-events-none absolute rounded-full"
        style={{ top: "28%", left: "18%", width: 4, height: 4, background: c.spark, boxShadow: `0 0 8px 2px ${c.spark}` }}
      />
      <span
        aria-hidden
        className="fracture-spark pointer-events-none absolute rounded-full"
        style={{ top: "62%", left: "78%", width: 3, height: 3, background: c.spark, boxShadow: `0 0 6px 2px ${c.spark}` }}
      />
    </Tag>
  );
}