"use client";

import { motion, useReducedMotion } from "motion/react";

type PulseCoreProps = {
  className?: string;
  color?: string;
  /** Loader width in pixels. */
  size?: number;
  /** 1 is the default pace; 2 is twice as fast. */
  speed?: number;
  /** Read out by screen readers. */
  label?: string;
};

/* PulseCore: a bright core beats while rings ripple out from it and fade. */
export function PulseCore({
  className = "",
  color = "#a78bfa",
  size = 72,
  speed = 1,
  label = "Loading",
}: PulseCoreProps) {
  const reduce = useReducedMotion();
  const beat = 1.8 / speed;

  return (
    <div role="status" className={`relative inline-block ${className}`} style={{ width: size, height: size }}>
      <span className="sr-only">{label}</span>
      {!reduce &&
        [0, 1, 2].map((i) => (
          <motion.span
            key={i}
            aria-hidden
            className="absolute inset-0 rounded-full border-2"
            style={{ borderColor: color }}
            initial={{ scale: 0.25, opacity: 0.9 }}
            animate={{ scale: 1, opacity: 0 }}
            transition={{ duration: beat, repeat: Infinity, ease: "easeOut", delay: (i * beat) / 3 }}
          />
        ))}
      <motion.span
        aria-hidden
        className="absolute inset-0 m-auto rounded-full"
        style={{
          width: size * 0.3,
          height: size * 0.3,
          background: `radial-gradient(circle at 35% 35%, #fff, ${color} 60%)`,
          boxShadow: `0 0 ${size / 3}px ${color}`,
        }}
        animate={reduce ? { opacity: [0.6, 1, 0.6] } : { scale: [1, 1.18, 0.96, 1] }}
        transition={{ duration: reduce ? 3 : beat / 3, repeat: Infinity, repeatDelay: reduce ? 0 : (beat * 2) / 3, ease: "easeOut" }}
      />
    </div>
  );
}