"use client";

import { motion, useReducedMotion } from "framer-motion";
import clsx from "clsx";

type Props = {
  className?: string;
  accent?: string;
  bg?: string;
};

const W = 760;
const H = 420;

/** Node component */
const Node = ({
  x,
  y,
  r = 14,
  accent = "#00b8db",
  pulse = false,
  faded = false,
}: {
  x: number;
  y: number;
  r?: number;
  accent?: string;
  pulse?: boolean;
  faded?: boolean;
}) => {
  const prefers = useReducedMotion();
  return (
    <>
      <motion.circle
        cx={x}
        cy={y}
        r={r + 10}
        stroke="#1F2937"
        strokeWidth={2}
        fill="none"
        initial={{ opacity: 0 }}
        animate={{ opacity: faded ? 0.3 : 0.9 }}
        transition={{ duration: 0.6 }}
      />
      <motion.circle
        cx={x}
        cy={y}
        r={r}
        fill={accent}
        initial={{ opacity: 0, scale: 0.8 }}
        animate={{
          opacity: faded ? 0.3 : 1,
          scale: pulse && !prefers ? [1, 1.12, 1] : 1,
        }}
        transition={{
          duration: pulse && !prefers ? 1.8 : 0.6,
          repeat: pulse && !prefers ? Infinity : 0,
          repeatType: "mirror",
          ease: [0.22, 1, 0.36, 1],
        }}
      />
    </>
  );
};

/** Moving packet along a path */
const Packet = ({
  path,
  delay = 0,
  accent = "#00b8db",
}: {
  path: string;
  delay?: number;
  accent?: string;
}) => {
  const prefers = useReducedMotion();
  return (
    <motion.circle
      r={5}
      fill={accent}
      initial={{ offsetDistance: "0%", opacity: 0 }}
      animate={{
        offsetDistance: ["0%", "100%"],
        opacity: [0, 1, 0],
      }}
      transition={{
        delay,
        duration: 1.6,
        repeat: !prefers ? Infinity : 0,
        repeatType: "loop",
        ease: "linear",
      }}
      style={{
        offsetPath: `path('${path}')`,
      }}
    />
  );
};

export default function NoControl({
  className,
  accent = "#00b8db",
  bg = "#0a0a0a",
}: Props) {
  const center = { x: 380, y: 210 };
  const outer = [
    { x: 160, y: 120 },
    { x: 600, y: 120 },
    { x: 160, y: 300 },
    { x: 600, y: 300 },
  ];

  const link = (a: any, b: any) => `M ${a.x} ${a.y} L ${b.x} ${b.y}`;

  return (
    <div
      className={clsx("relative overflow-hidden", className)}
      aria-hidden="true"
      role="img"
      aria-label="No single point of control illustration"
      style={{ background: bg }}
    >
      <svg viewBox={`0 0 ${W} ${H}`} className="w-full h-full">
        {/* Background grid */}
        <defs>
          <pattern id="grid-dark" width="28" height="28" patternUnits="userSpaceOnUse">
            <path d="M 28 0 L 0 0 0 28" fill="none" stroke="#0f0f0f" strokeWidth="1" />
          </pattern>
        </defs>
        <rect width={W} height={H} fill="url(#grid-dark)" />

        {/* Connections between outer nodes (decentralized ring) */}
        <motion.path
          d={`M ${outer[0].x} ${outer[0].y} 
             L ${outer[1].x} ${outer[1].y} 
             L ${outer[3].x} ${outer[3].y} 
             L ${outer[2].x} ${outer[2].y} Z`}
          stroke="#1F2937"
          strokeWidth={3}
          strokeLinecap="round"
          fill="none"
          initial={{ pathLength: 0, opacity: 0.3 }}
          animate={{ pathLength: 1, opacity: 0.6 }}
          transition={{ duration: 1.2, ease: [0.22, 1, 0.36, 1] }}
        />

        {/* Cyan pulsing signals around the ring */}
        {outer.map((o, i) => {
          const next = outer[(i + 1) % outer.length];
          const p = link(o, next);
          return <Packet key={`p-${i}`} path={p} delay={i * 0.4} accent={accent} />;
        })}

        {/* Faded center node (represents the “former” single point) */}
        <Node x={center.x} y={center.y} r={18} accent={accent} faded pulse={false} />

        {/* Outer sovereign nodes */}
        {outer.map((n, i) => (
          <Node key={i} x={n.x} y={n.y} r={14} accent={accent} pulse />
        ))}

        {/* Cross mark over center node (control denied) */}
        <motion.path
          d={`M ${center.x - 12} ${center.y - 12} L ${center.x + 12} ${center.y + 12} M ${center.x - 12} ${center.y + 12} L ${center.x + 12} ${center.y - 12}`}
          stroke="#FF4D4D"
          strokeWidth={3}
          strokeLinecap="round"
          initial={{ opacity: 0, scale: 0 }}
          animate={{ opacity: 1, scale: 1 }}
          transition={{ delay: 0.8, duration: 0.6 }}
        />
      </svg>
    </div>
  );
}