Button Background Spotlight

'use client';
import { useRef, useState } from 'react';

const ButtonAnimatedGradient = () => {
  const divRef = useRef<HTMLButtonElement>(null);
  const [isFocused, setIsFocused] = useState(false);
  const [position, setPosition] = useState({ x: 0, y: 0 });
  const [opacity, setOpacity] = useState(0);

  const handleMouseMove = (e: React.MouseEvent<HTMLButtonElement>) => {
    if (!divRef.current || isFocused) return;

    const div = divRef.current;
    const rect = div.getBoundingClientRect();

    setPosition({ x: e.clientX - rect.left, y: e.clientY - rect.top });
  };

  const handleFocus = () => {
    setIsFocused(true);
    setOpacity(1);
  };

  const handleBlur = () => {
    setIsFocused(false);
    setOpacity(0);
  };

  const handleMouseEnter = () => {
    setOpacity(1);
  };

  const handleMouseLeave = () => {
    setOpacity(0);
  };

  return (
    <>
      <button
        ref={divRef}
        onMouseMove={handleMouseMove}
        onFocus={handleFocus}
        onBlur={handleBlur}
        onMouseEnter={handleMouseEnter}
        onMouseLeave={handleMouseLeave}
        className='relative inline-flex h-12 items-center justify-center overflow-hidden rounded-md border border-gray-800 bg-gradient-to-r from-gray-900 to-gray-950 px-6 font-medium text-gray-300 shadow-2xl transition-colors focus:outline-none focus:ring-2 focus:ring-gray-400 focus:ring-offset-2 focus:ring-offset-gray-50'
      >
        <div
          className='pointer-events-none absolute -inset-px opacity-0 transition duration-300'
          style={{
            opacity,
            background: `radial-gradient(300px circle at ${position.x}px ${position.y}px, rgba(255,255,255,.1), #0000000f)`,
          }}
        />
        Click Me
      </button>
    </>
  );
};

export default ButtonAnimatedGradient;