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

const GLYPHS = "▒▓░█#@*+:-/[]{}<>_";

interface JapaneseHoverTextProps {
  japanese: string;
  english: string;
  className?: string;
}

/**
 * Displays Japanese text, transitions to English on hover with scramble effect
 */
export function JapaneseHoverText({
  japanese,
  english,
  className = "",
}: JapaneseHoverTextProps) {
  const [isHovered, setIsHovered] = useState(false);
  const [displayText, setDisplayText] = useState(english);
  const timerRef = useRef<ReturnType<typeof setInterval> | null>(null);
  const iterationRef = useRef(0);

  const scrambleToEnglish = useCallback(() => {
    setIsHovered(true);

    // Clear any existing animation
    if (timerRef.current) {
      clearInterval(timerRef.current);
    }

    iterationRef.current = 0;

    timerRef.current = setInterval(() => {
      const text = english;
      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(english);
      }
    }, 26);
  }, [english]);

  const resetToJapanese = useCallback(() => {
    if (timerRef.current) {
      clearInterval(timerRef.current);
      timerRef.current = null;
    }
    setIsHovered(false);
    setDisplayText(english);
  }, [english]);

  return (
    <span
      className={`cursor-default ${className}`}
      onMouseEnter={scrambleToEnglish}
      onMouseLeave={resetToJapanese}
    >
      {isHovered ? displayText : japanese}
    </span>
  );
}
