"use client";

import { motion, useMotionValue, useSpring, useTransform } from "motion/react";
import { useEffect, useRef, useState } from "react";

import { cn } from "@/lib/utils";

interface TelemetryMetric {
  label: string;
  value: number;
  unit: string;
  precision?: number;
  min?: number;
  max?: number;
}

const METRICS_CONFIG: TelemetryMetric[] = [
  {
    label: "UPTIME",
    value: 99.97,
    unit: "%",
    precision: 2,
    min: 99.9,
    max: 100,
  },
  {
    label: "INTEGRAÇÕES",
    value: 12,
    unit: " ativas",
    precision: 0,
    min: 8,
    max: 16,
  },
  {
    label: "BUILDS",
    value: 247,
    unit: " /dia",
    precision: 0,
    min: 200,
    max: 300,
  },
  { label: "LATÊNCIA", value: 12, unit: " ms", precision: 0, min: 8, max: 28 },
];

const UPDATE_INTERVAL = 3000;

const springConfigs = [
  { stiffness: 300, damping: 30, mass: 0.8 },
  { stiffness: 200, damping: 25, mass: 1 },
  { stiffness: 150, damping: 20, mass: 1.2 },
  { stiffness: 150, damping: 20, mass: 1.2 },
];

export function TelemetryStrip({
  className,
  reducedMotion = false,
}: {
  className?: string;
  reducedMotion?: boolean;
}) {
  const [_metrics, setMetrics] = useState<TelemetryMetric[]>(METRICS_CONFIG);
  const pointerX = useMotionValue(0);
  const pointerY = useMotionValue(0);
  const isHovering = useRef(false);
  const intervalRef = useRef<ReturnType<typeof setInterval> | null>(null);

  const metricValue0 = useSpring(
    useMotionValue(METRICS_CONFIG[0].value),
    springConfigs[0],
  );
  const metricValue1 = useSpring(
    useMotionValue(METRICS_CONFIG[1].value),
    springConfigs[1],
  );
  const metricValue2 = useSpring(
    useMotionValue(METRICS_CONFIG[2].value),
    springConfigs[2],
  );
  const metricValue3 = useSpring(
    useMotionValue(METRICS_CONFIG[3].value),
    springConfigs[3],
  );
  const metricValues = [metricValue0, metricValue1, metricValue2, metricValue3];

  // Parallax sutil em px, sinal alternado por métrica — assinatura "reage ao ponteiro"
  const pointerShiftX = useTransform(pointerX, [-1, 1], [-8, 8]);
  const pointerShiftY = useTransform(pointerY, [-1, 1], [-5, 5]);
  const pointerShiftXNeg = useTransform(pointerShiftX, (v) => -v);
  const pointerShiftYNeg = useTransform(pointerShiftY, (v) => -v);

  const generateVariation = useRef((metric: TelemetryMetric): number => {
    const range =
      (metric.max ?? metric.value * 1.1) - (metric.min ?? metric.value * 0.9);
    const variation = (Math.random() - 0.5) * range * 0.15;
    const newValue = metric.value + variation;
    return Math.max(
      metric.min ?? -Infinity,
      Math.min(metric.max ?? Infinity, newValue),
    );
  });

  const updateMetrics = useRef(() => {
    setMetrics((prev) =>
      prev.map((metric) => ({
        ...metric,
        value: generateVariation.current(metric),
      })),
    );
  });

  useEffect(() => {
    if (reducedMotion) return;

    intervalRef.current = setInterval(updateMetrics.current, UPDATE_INTERVAL);
    return () => {
      if (intervalRef.current) clearInterval(intervalRef.current);
    };
  }, [reducedMotion]);

  useEffect(() => {
    const handlePointerMove = (e: MouseEvent) => {
      const x = (e.clientX / window.innerWidth) * 2 - 1;
      const y = -(e.clientY / window.innerHeight) * 2 + 1;
      pointerX.set(x);
      pointerY.set(y);
    };

    window.addEventListener("pointermove", handlePointerMove);
    return () => window.removeEventListener("pointermove", handlePointerMove);
  }, [pointerX, pointerY]);

  return (
    <section
      className={cn(
        "cinematic-glass border-[rgba(204,255,0,0.18)] bg-[rgba(10,10,10,0.82)] backdrop-blur-[24px] rounded-[var(--r-lg)] p-sp-4 lg:p-sp-5 grid grid-cols-2 gap-sp-4 lg:gap-sp-6",
        className,
      )}
      aria-label="Telemetria operacional em tempo real"
      onPointerEnter={() => {
        isHovering.current = true;
      }}
      onPointerLeave={() => {
        isHovering.current = false;
      }}
    >
      {METRICS_CONFIG.map((metric, index) => (
        <motion.div
          key={metric.label}
          className="relative flex flex-col items-start gap-1"
          style={
            reducedMotion
              ? undefined
              : {
                  x: index % 2 === 0 ? pointerShiftX : pointerShiftXNeg,
                  y: index % 2 === 0 ? pointerShiftY : pointerShiftYNeg,
                }
          }
        >
          <div className="font-mono text-[11px] uppercase tracking-[0.14em] text-[rgba(244,242,237,.7)]">
            {metric.label}
          </div>
          <div
            className="whitespace-nowrap font-display font-extrabold text-[clamp(1.35rem,2.6vw,1.875rem)] leading-none text-[var(--paper)] tabular-nums"
            aria-hidden="true"
          >
            {reducedMotion
              ? metric.value.toFixed(metric.precision ?? 0)
              : metricValues[index].get().toFixed(metric.precision ?? 0)}
            <span className="font-mono text-[11px] font-normal text-[rgba(244,242,237,.58)]">
              {metric.unit}
            </span>
          </div>
          <div
            className="h-px w-full bg-[linear-gradient(90deg,var(--slash),transparent)] opacity-30"
            style={{
              transformOrigin: "left center",
              transform: reducedMotion
                ? "scaleX(1)"
                : `scaleX(${Math.max(0.15, Math.min(1, metric.value / (metric.max ?? 100)))})`,
            }}
            aria-hidden="true"
          />
        </motion.div>
      ))}
      <span className="sr-only">
        Painel de telemetria operacional: uptime 99,97 por cento, doze
        integrações ativas, duzentos e quarenta e sete builds por dia, latência
        doze milissegundos. Valores decorativos simulando uma sala de controle
        real.
      </span>
    </section>
  );
}