"use client";

import { useId, type CSSProperties, type ElementType, type ReactNode } from "react";

type HeroOrbitProps = {
  title: string;
  /** Small line above the title. */
  eyebrow?: string;
  subtitle?: string;
  /** Buttons or links under the text. */
  children?: ReactNode;
  /** Small logos, avatars or icons. They are spread over the 3 rings. Decoration: hidden from screen readers. */
  orbiters?: ReactNode[];
  /** Seconds for the inner ring to go round once. Outer rings are slower. */
  duration?: number;
  /** Soft patch behind the text that keeps it readable. Match it to the background. */
  veil?: string;
  /** h1 by default. Use h2 if the page already has an h1. */
  headingAs?: ElementType;
  /** Set the height, background and text colour here. */
  className?: string;
};

const RINGS = [
  { size: 50, min: 290, pace: 1, way: "normal" },
  { size: 72, min: 420, pace: 1.6, way: "reverse" },
  { size: 94, min: 550, pace: 2.3, way: "normal" },
] as const;

const PAUSE = "group-hover/orbit:[animation-play-state:paused] motion-reduce:[animation-play-state:paused]";

// Longhand, not the animation shorthand: inline it would reset play-state and the pause classes would lose.
const spin = (seconds: number, way: "normal" | "reverse"): CSSProperties => ({
  animationName: "hero-orbit-turn",
  animationDuration: `${seconds}s`,
  animationTimingFunction: "linear",
  animationIterationCount: "infinite",
  animationDirection: way,
});

/* HeroOrbit: a centred hero with three rings around the text. Logos or avatars circle on them and stay upright. Hover pauses them. */
export function HeroOrbit({
  title,
  eyebrow,
  subtitle,
  children,
  orbiters = [],
  duration = 28,
  veil = "#0b0a14",
  headingAs: Heading = "h1",
  className = "min-h-[36rem] bg-[#0b0a14] text-white",
}: HeroOrbitProps) {
  const id = useId();

  return (
    <section aria-labelledby={id} className={`group/orbit @container relative isolate grid place-items-center overflow-hidden ${className}`}>
      <style>{`@keyframes hero-orbit-turn { to { transform: rotate(360deg); } }`}</style>
      <div aria-hidden className="absolute top-1/2 left-1/2 -z-10">
        {RINGS.map((ring, r) => {
          const onRing = orbiters.filter((_, i) => i % RINGS.length === r);
          const seconds = duration * ring.pace;
          const size = `max(${ring.size}cqw, ${ring.min}px)`;
          return (
            <div
              key={ring.size}
              className={`absolute rounded-full border border-current/15 ${PAUSE}`}
              style={{ width: size, height: size, left: `calc(${size} / -2)`, top: `calc(${size} / -2)`, ...spin(seconds, ring.way) }}
            >
              {onRing.map((node, i) => {
                const angle = (360 / onRing.length) * i + r * 40;
                return (
                  <div
                    key={i}
                    className="absolute top-1/2 left-1/2 size-0"
                    style={{ transform: `rotate(${angle}deg) translateY(calc(${size} / -2)) rotate(${-angle}deg)` }}
                  >
                    <div className="absolute w-max -translate-x-1/2 -translate-y-1/2">
                      <div className={PAUSE} style={spin(seconds, ring.way === "normal" ? "reverse" : "normal")}>
                        {node}
                      </div>
                    </div>
                  </div>
                );
              })}
            </div>
          );
        })}
      </div>

      <div className="relative flex max-w-2xl flex-col items-center px-5 py-6 text-center">
        <div aria-hidden className="absolute -inset-x-16 -inset-y-10 -z-10" style={{ background: `radial-gradient(closest-side, ${veil} 55%, transparent)` }} />
        {eyebrow && <p className="mb-2 text-xs font-medium tracking-[0.2em] uppercase opacity-70 @2xl:mb-4 @2xl:text-sm">{eyebrow}</p>}
        <Heading id={id} className="text-[clamp(1.6rem,8cqw,4rem)] leading-[1.08] font-semibold tracking-tight text-balance">
          {title}
        </Heading>
        {subtitle && <p className="mt-3 max-w-lg text-sm text-pretty opacity-70 @2xl:mt-5 @2xl:text-lg">{subtitle}</p>}
        {children && <div className="mt-4 flex flex-wrap justify-center gap-3 @2xl:mt-8">{children}</div>}
      </div>
    </section>
  );
}