"use client";

import { motion } from "framer-motion";
import { useEffect, useRef } from "react";
import * as THREE from "three";
import type { Messages } from "@/messages";

export default function GlassesModelSection({ t }: { t: Messages }) {
  const canvasRef = useRef<HTMLCanvasElement | null>(null);
  const wrapRef = useRef<HTMLDivElement | null>(null);
  const pointerRef = useRef({ x: 0, y: 0 });

  useEffect(() => {
    const canvas = canvasRef.current;
    const wrap = wrapRef.current;
    if (!canvas || !wrap) return;

    let frame = 0;
    let disposed = false;
    const scene = new THREE.Scene();
    const camera = new THREE.PerspectiveCamera(34, 1, 0.1, 100);
    camera.position.set(0, 0.2, 7.2);

    const renderer = new THREE.WebGLRenderer({ canvas, antialias: true, alpha: true, powerPreference: "high-performance" });
    renderer.setClearColor(0x000000, 0);
    renderer.outputColorSpace = THREE.SRGBColorSpace;
    renderer.toneMapping = THREE.ACESFilmicToneMapping;
    renderer.toneMappingExposure = 1.08;

    const group = createGlassesModel();
    scene.add(group);
    scene.add(new THREE.HemisphereLight(0xffffff, 0xaeb9c6, 1.8));

    const key = new THREE.DirectionalLight(0xffffff, 3.8);
    key.position.set(3.4, 4.6, 5.2);
    scene.add(key);

    const rim = new THREE.DirectionalLight(0x9ec7ff, 1.7);
    rim.position.set(-4, 1.8, -2);
    scene.add(rim);

    const resize = () => {
      const { width, height } = wrap.getBoundingClientRect();
      const pixelRatio = Math.min(window.devicePixelRatio || 1, 1.7);
      renderer.setPixelRatio(pixelRatio);
      renderer.setSize(width, height, false);
      camera.aspect = width / Math.max(height, 1);
      camera.updateProjectionMatrix();
    };

    const observer = new ResizeObserver(resize);
    observer.observe(wrap);
    resize();

    const handlePointerMove = (event: PointerEvent) => {
      const bounds = wrap.getBoundingClientRect();
      pointerRef.current.x = ((event.clientX - bounds.left) / bounds.width - 0.5) * 2;
      pointerRef.current.y = ((event.clientY - bounds.top) / bounds.height - 0.5) * 2;
    };

    const handlePointerLeave = () => {
      pointerRef.current.x = 0;
      pointerRef.current.y = 0;
    };

    wrap.addEventListener("pointermove", handlePointerMove);
    wrap.addEventListener("pointerleave", handlePointerLeave);

    const animate = () => {
      if (disposed) return;
      const targetY = pointerRef.current.x * 0.28;
      const targetX = pointerRef.current.y * 0.16;
      group.rotation.y += (targetY + Math.sin(performance.now() * 0.00045) * 0.22 - group.rotation.y) * 0.055;
      group.rotation.x += (-0.08 - targetX - group.rotation.x) * 0.055;
      group.rotation.z = Math.sin(performance.now() * 0.00062) * 0.025;

      renderer.render(scene, camera);
      frame = window.requestAnimationFrame(animate);
    };

    animate();

    return () => {
      disposed = true;
      window.cancelAnimationFrame(frame);
      observer.disconnect();
      wrap.removeEventListener("pointermove", handlePointerMove);
      wrap.removeEventListener("pointerleave", handlePointerLeave);
      scene.traverse((object) => {
        if (!(object instanceof THREE.Mesh)) return;
        object.geometry.dispose();
        const material = object.material;
        if (Array.isArray(material)) material.forEach((item) => item.dispose());
        else material.dispose();
      });
      renderer.dispose();
    };
  }, []);

  return (
    <section id="model" className="relative px-4 py-20 sm:px-6 lg:py-28">
      <div className="mx-auto max-w-7xl">
        <div className="relative z-10 max-w-3xl">
          <p className="mb-4 text-xs font-semibold uppercase tracking-[0.28em] text-optical/75">{t.model.eyebrow}</p>
          <h2 className="text-4xl font-semibold tracking-[-0.055em] text-ink sm:text-6xl">{t.model.title}</h2>
          <p className="mt-5 max-w-2xl text-base leading-8 text-ink/62 sm:text-lg">{t.model.body}</p>
        </div>

        <div ref={wrapRef} className="relative left-1/2 mt-8 min-h-[32rem] w-screen -translate-x-1/2 overflow-hidden lg:min-h-[38rem]" data-testid="glasses-3d-wrap">
          <canvas ref={canvasRef} className="absolute inset-0 h-full w-full touch-pan-y" aria-label={t.model.canvasLabel} data-testid="glasses-3d-canvas" />
          <div className="pointer-events-none absolute inset-0 bg-[radial-gradient(circle_at_50%_45%,rgba(255,255,255,0.58),transparent_34%),radial-gradient(circle_at_50%_72%,rgba(49,95,143,0.15),transparent_28%)]" />

          <Annotation className="left-4 top-8 sm:left-10 lg:left-16 lg:top-20" align="left" label={t.model.annotations[0].label} body={t.model.annotations[0].body} />
          <Annotation className="right-4 top-36 sm:right-10 lg:right-20 lg:top-24" align="right" label={t.model.annotations[1].label} body={t.model.annotations[1].body} />
          <Annotation className="bottom-8 left-6 sm:left-16 lg:bottom-16 lg:left-[42%]" align="left" label={t.model.annotations[2].label} body={t.model.annotations[2].body} />
        </div>
      </div>
    </section>
  );
}

function Annotation({ label, body, align, className }: { label: string; body: string; align: "left" | "right"; className: string }) {
  return (
    <motion.div
      className={`pointer-events-none absolute z-10 max-w-[14rem] ${className} ${align === "right" ? "text-right" : "text-left"}`}
      initial={{ opacity: 0, y: 14 }}
      whileInView={{ opacity: 1, y: 0 }}
      viewport={{ once: true, amount: 0.6 }}
      transition={{ duration: 0.5, ease: [0.22, 1, 0.36, 1] }}
    >
      <div className={`mb-3 flex items-center gap-3 ${align === "right" ? "justify-end" : ""}`}>
        {align === "right" ? <span className="h-px w-16 bg-ink/18" /> : null}
        <span className="grid size-3 place-items-center rounded-full bg-optical shadow-[0_0_0_7px_rgba(49,95,143,0.12)]" />
        {align === "left" ? <span className="h-px w-16 bg-ink/18" /> : null}
      </div>
      <p className="text-xs font-semibold uppercase tracking-[0.22em] text-optical/80">{label}</p>
      <p className="mt-2 text-sm leading-6 text-ink/60">{body}</p>
    </motion.div>
  );
}

function createGlassesModel() {
  const group = new THREE.Group();
  group.scale.setScalar(1.08);

  const frameMaterial = new THREE.MeshPhysicalMaterial({
    color: 0x161a20,
    roughness: 0.28,
    metalness: 0.55,
    clearcoat: 0.85,
    clearcoatRoughness: 0.18
  });
  const lensMaterial = new THREE.MeshPhysicalMaterial({
    color: 0xbfd7e3,
    roughness: 0.12,
    metalness: 0,
    transmission: 0.48,
    transparent: true,
    opacity: 0.28,
    thickness: 0.12,
    side: THREE.DoubleSide
  });
  const padMaterial = new THREE.MeshPhysicalMaterial({
    color: 0xf8fbff,
    roughness: 0.18,
    transparent: true,
    opacity: 0.52
  });
  const accentMaterial = new THREE.MeshBasicMaterial({ color: 0xffffff, transparent: true, opacity: 0.42 });

  const ringGeometry = new THREE.TorusGeometry(1.04, 0.065, 18, 112);
  const lensGeometry = new THREE.CircleGeometry(0.93, 72);
  const hingeGeometry = new THREE.BoxGeometry(0.22, 0.22, 0.22);
  const padGeometry = new THREE.SphereGeometry(0.16, 24, 16);

  [-1.18, 1.18].forEach((xPosition) => {
    const ring = new THREE.Mesh(ringGeometry, frameMaterial);
    ring.position.x = xPosition;
    ring.scale.y = 0.68;
    group.add(ring);

    const lens = new THREE.Mesh(lensGeometry, lensMaterial);
    lens.position.set(xPosition, 0, -0.03);
    lens.scale.set(1, 0.66, 1);
    group.add(lens);

    const highlight = new THREE.Mesh(new THREE.PlaneGeometry(0.58, 0.045), accentMaterial);
    highlight.position.set(xPosition - 0.2, 0.34, 0.02);
    highlight.rotation.z = -0.22;
    group.add(highlight);

    const hinge = new THREE.Mesh(hingeGeometry, frameMaterial);
    hinge.position.set(xPosition > 0 ? 2.18 : -2.18, 0.03, -0.02);
    hinge.scale.set(0.55, 0.8, 0.62);
    group.add(hinge);
  });

  const bridgeCurve = new THREE.CatmullRomCurve3([
    new THREE.Vector3(-0.3, 0.08, 0),
    new THREE.Vector3(-0.12, 0.25, 0.04),
    new THREE.Vector3(0, 0.3, 0.05),
    new THREE.Vector3(0.12, 0.25, 0.04),
    new THREE.Vector3(0.3, 0.08, 0)
  ]);
  group.add(new THREE.Mesh(new THREE.TubeGeometry(bridgeCurve, 38, 0.052, 14, false), frameMaterial));

  [-0.28, 0.28].forEach((xPosition) => {
    const pad = new THREE.Mesh(padGeometry, padMaterial);
    pad.position.set(xPosition, -0.22, 0.14);
    pad.scale.set(0.55, 0.9, 0.28);
    pad.rotation.z = xPosition > 0 ? -0.22 : 0.22;
    group.add(pad);
  });

  const leftTemple = new THREE.CatmullRomCurve3([
    new THREE.Vector3(-2.18, 0.03, -0.03),
    new THREE.Vector3(-2.75, 0.03, -0.72),
    new THREE.Vector3(-3.1, -0.04, -1.75),
    new THREE.Vector3(-2.84, -0.28, -2.42)
  ]);
  const rightTemple = new THREE.CatmullRomCurve3([
    new THREE.Vector3(2.18, 0.03, -0.03),
    new THREE.Vector3(2.75, 0.03, -0.72),
    new THREE.Vector3(3.1, -0.04, -1.75),
    new THREE.Vector3(2.84, -0.28, -2.42)
  ]);

  group.add(new THREE.Mesh(new THREE.TubeGeometry(leftTemple, 54, 0.055, 14, false), frameMaterial));
  group.add(new THREE.Mesh(new THREE.TubeGeometry(rightTemple, 54, 0.055, 14, false), frameMaterial));

  const shadow = new THREE.Mesh(
    new THREE.CircleGeometry(2.6, 96),
    new THREE.MeshBasicMaterial({ color: 0x315f8f, transparent: true, opacity: 0.08, depthWrite: false })
  );
  shadow.position.set(0, -1.06, -0.92);
  shadow.scale.y = 0.18;
  group.add(shadow);

  group.rotation.set(-0.08, -0.2, 0);
  return group;
}