makima/frontend/src/hooks/useTextScramble.ts


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import { useState, useCallback, useRef } from "react";

const GLYPHS = "▒▓░█#@*+:-/[]{}<>_";

export function useTextScramble(originalText: string) {
  const [displayText, setDisplayText] = useState(originalText);
  const timerRef = useRef<ReturnType<typeof setInterval> | null>(null);
  const iterationRef = useRef(0);

  const scramble = useCallback(() => {
    // Clear any existing animation
    if (timerRef.current) {
      clearInterval(timerRef.current);
    }

    iterationRef.current = 0;

    timerRef.current = setInterval(() => {
      const text = originalText;
      const iteration = iterationRef.current;

      const display = text
        .split("")
        .map((char, index) => {
          if (index < iteration) return char;
          return GLYPHS.charAt(Math.floor(Math.random() * GLYPHS.length));
        })
        .join("");

      setDisplayText(display);
      iterationRef.current += 1;

      if (iteration > text.length + 2) {
        if (timerRef.current) {
          clearInterval(timerRef.current);
          timerRef.current = null;
        }
        setDisplayText(originalText);
      }
    }, 26);
  }, [originalText]);

  const reset = useCallback(() => {
    if (timerRef.current) {
      clearInterval(timerRef.current);
      timerRef.current = null;
    }
    setDisplayText(originalText);
  }, [originalText]);

  return { displayText, scramble, reset };
}