"use client";

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

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

const W = 760;
const H = 420;

export default function Deterministic({
  className,
  accent = "#00b8db",
  gridStroke = "#2b2a2a",
}: Props) {
  const prefers = useReducedMotion();

  const stages = [
    { x: 180, y: 180, w: 120, h: 80, label: "Build" },
    { x: 330, y: 180, w: 120, h: 80, label: "Package" },
    { x: 480, y: 180, w: 120, h: 80, label: "Deploy" },
  ];

  // Packet path (deterministic flow)
  const packetPath = `M ${stages[0].x + 120} ${stages[0].y + 40}
                      L ${stages[1].x + 0}   ${stages[1].y + 40}
                      L ${stages[1].x + 120} ${stages[1].y + 40}
                      L ${stages[2].x + 0}   ${stages[2].y + 40}`;

  // tiny arrow for each transition
  const arrows = [
    `M ${stages[0].x + 120} ${stages[0].y + 40} L ${stages[1].x + 6} ${stages[1].y + 40}`,
    `M ${stages[1].x + 120} ${stages[1].y + 40} L ${stages[2].x + 6} ${stages[2].y + 40}`
  ];

  return (
    <div
      className={clsx("relative overflow-hidden", className)}
      aria-hidden="true"
      role="img"
      aria-label="Deterministic orchestration: predictable deployments"
      style={{ background: "transparent" }}
    >
      <svg viewBox={`0 0 ${W} ${H}`} className="w-full h-full">

        {/* BACKGROUND GRID */}
        <defs>
          <pattern id="grid-orch" width="28" height="28" patternUnits="userSpaceOnUse">
            <path d="M 28 0 L 0 0 0 28"
              fill="none"
              stroke={gridStroke}
              strokeWidth="1"
              opacity="0.45"
            />
          </pattern>

          {/* Soft glow for highlight */}
          <filter id="orch-glow">
            <feGaussianBlur stdDeviation="4" result="blur" />
            <feMerge>
              <feMergeNode in="blur" />
              <feMergeNode in="SourceGraphic" />
            </feMerge>
          </filter>
        </defs>

        <rect width={W} height={H} fill="url(#grid-orch)" />

        {/* STAGE BOXES */}
        {stages.map((s, i) => (
          <motion.rect
            key={`stage-${i}`}
            x={s.x}
            y={s.y}
            width={s.w}
            height={s.h}
            rx={14}
            fill="#0d0d0d"
            stroke="#1a1a1a"
            strokeWidth={2}
            initial={{ opacity: 0 }}
            animate={{ opacity: 0.9 }}
            transition={{ duration: 0.6 + i * 0.1 }}
          />
        ))}

        {/* Stage labels (subtle, not text-heavy) */}
        {stages.map((s, i) => (
          <motion.text
            key={`label-${i}`}
            x={s.x + s.w / 2}
            y={s.y + s.h / 2 + 6}
            fill="#9ca3af"
            textAnchor="middle"
            fontSize="14"
            fontFamily="Inter, sans-serif"
            initial={{ opacity: 0 }}
            animate={{ opacity: 0.9 }}
            transition={{ delay: 0.1 * i, duration: 0.6 }}
          >
            {s.label}
          </motion.text>
        ))}

        {/* CONSISTENT ORCHESTRATION LINES */}
        {arrows.map((d, i) => (
          <motion.path
            key={`arrow-${i}`}
            d={d}
            stroke="#3a3a3a"
            strokeWidth={4}
            strokeLinecap="round"
            fill="none"
            initial={{ pathLength: 0, opacity: 0 }}
            animate={{ pathLength: 1, opacity: 0.8 }}
            transition={{ delay: 0.15 * i, duration: 0.8, ease: [0.22, 1, 0.36, 1] }}
          />
        ))}

        {/* CYAN ACCENT OVERLAY ON LINES (predictable updates) */}
        {arrows.map((d, i) => (
          <motion.path
            key={`arrow-accent-${i}`}
            d={d}
            stroke={accent}
            strokeWidth={2}
            strokeLinecap="round"
            strokeDasharray="10"
            fill="none"
            initial={{ pathLength: 0, opacity: 0 }}
            animate={{ pathLength: 1, opacity: 1 }}
            transition={{
              delay: 0.25 * i,
              duration: 0.8,
              ease: [0.22, 1, 0.36, 1]
            }}
          />
        ))}

        {/* MOVING PACKET SHOWING DETERMINISTIC FLOW */}
        {!prefers && (
          <motion.circle
            r={6}
            fill={accent}
            filter="url(#orch-glow)"
            style={{
              offsetPath: `path('${packetPath}')`,
            }}
            initial={{ offsetDistance: "0%", opacity: 0 }}
            animate={{
              offsetDistance: ["0%", "100%"],
              opacity: [0.2, 1, 0.2],
            }}
            transition={{
              duration: 2.3,
              repeat: Infinity,
              repeatType: "loop",
              ease: "linear",
            }}
          />
        )}

        {/* FINAL CONFIRMATION PULSE AT DEPLOY STAGE */}
        {!prefers && (
          <motion.circle
            cx={stages[2].x + stages[2].w / 2}
            cy={stages[2].y + stages[2].h / 2}
            r={24}
            fill={accent}
            opacity={0.1}
            initial={{ scale: 0.9, opacity: 0 }}
            animate={{ scale: [1, 1.15, 1], opacity: [0.05, 0.3, 0.05] }}
            transition={{
              duration: 1.8,
              repeat: Infinity,
              repeatType: "mirror",
              ease: [0.22, 1, 0.36, 1],
            }}
            filter="url(#orch-glow)"
          />
        )}
      </svg>
    </div>
  );
}