// 3D 地球效果（首页 banner 右侧）
// 依赖：Three.js（全局 THREE 对象），脚本路径建议：/web/BlackFruit-web/vender/three/three.min.js

(function () {
  function initGlobe() {
    var container = document.getElementById("bannerGlobe");
    if (!container) {
      console.warn("[Globe] bannerGlobe container not found");
      return;
    }
    if (typeof THREE === "undefined") {
      // Three.js 未加载时直接跳过，不影响其它功能
      console.warn("[Globe] THREE is undefined, please ensure three.min.js is loaded");
      return;
    }

    var width = container.clientWidth || 400;
    var height = container.clientHeight || 400;

    var scene = new THREE.Scene();

    var camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 1000);
    var radius = 1.2;
    camera.position.set(0, 0, radius * 3.2);
    camera.lookAt(0, 0, 0);

    var renderer = new THREE.WebGLRenderer({ antialias: true, alpha: true });
    renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, 2));
    renderer.setSize(width, height);
    renderer.setClearColor(0x000000, 0); // 透明背景，融入页面
    container.appendChild(renderer.domElement);

    // 光照：柔和的环境光 + 方向光
    scene.add(new THREE.AmbientLight(0xffffff, 0.5));
    var dirLight = new THREE.DirectionalLight(0xffffff, 0.9);
    dirLight.position.set(5, 3, 5);
    scene.add(dirLight);

    var globeGroup = new THREE.Group();
    scene.add(globeGroup);

    // 地球球体
    var earthGeometry = new THREE.SphereGeometry(radius, 64, 64);

    // 纯色高光材质，若后续有贴图可替换为 MeshPhongMaterial + map
    var earthMaterial = new THREE.MeshPhongMaterial({
      color: 0x163a5f,
      emissive: 0x061727,
      shininess: 35,
      specular: 0x3aaefc,
    });

    var earthMesh = new THREE.Mesh(earthGeometry, earthMaterial);
    globeGroup.add(earthMesh);

    // 大气层发光效果
    var atmosphereGeometry = new THREE.SphereGeometry(radius * 1.06, 64, 64);
    var atmosphereMaterial = new THREE.MeshBasicMaterial({
      color: 0x2b9fff,
      transparent: true,
      opacity: 0.25,
      side: THREE.BackSide,
    });
    var atmosphereMesh = new THREE.Mesh(
      atmosphereGeometry,
      atmosphereMaterial
    );
    globeGroup.add(atmosphereMesh);

    // 将经纬度转换为球面坐标
    function latLngToVector3(lat, lng, r) {
      var phi = (90 - lat) * (Math.PI / 180);
      var theta = (lng + 180) * (Math.PI / 180);
      var x = -r * Math.sin(phi) * Math.cos(theta);
      var z = r * Math.sin(phi) * Math.sin(theta);
      var y = r * Math.cos(phi);
      return new THREE.Vector3(x, y, z);
    }

    // 一些示例节点（可以根据业务改为真实机房经纬度）
    var nodeConfigs = [
      { lat: 39.9, lng: 116.4 }, // 北京
      { lat: 31.2, lng: 121.5 }, // 上海
      { lat: 22.5, lng: 114.1 }, // 香港
      { lat: 1.3, lng: 103.8 }, // 新加坡
      { lat: 37.8, lng: -122.4 }, // 旧金山
      { lat: 52.5, lng: 13.4 }, // 柏林
      { lat: 35.7, lng: 139.7 }, // 东京
    ];

    var nodeGroup = new THREE.Group();
    globeGroup.add(nodeGroup);

    var nodeMaterial = new THREE.MeshBasicMaterial({
      color: 0x5ad8ff,
    });

    var nodes = [];
    var nodeRadius = radius * 0.03;
    nodeConfigs.forEach(function (cfg, index) {
      var pos = latLngToVector3(cfg.lat, cfg.lng, radius * 1.02);
      var geom = new THREE.SphereGeometry(nodeRadius, 16, 16);
      var mesh = new THREE.Mesh(geom, nodeMaterial);
      mesh.position.copy(pos);
      nodeGroup.add(mesh);

      nodes.push({
        mesh: mesh,
        baseScale: 1,
        phase: Math.random() * Math.PI * 2 + index,
      });
    });

    // 通过 Points 实现星空点阵背景
    var starGeometry = new THREE.BufferGeometry();
    var starCount = 600;
    var starPositions = new Float32Array(starCount * 3);
    for (var i = 0; i < starCount; i++) {
      var sr = radius * 4 + Math.random() * radius * 2;
      var theta = Math.random() * Math.PI * 2;
      var phi = Math.acos(2 * Math.random() - 1);
      var sx = sr * Math.sin(phi) * Math.cos(theta);
      var sy = sr * Math.sin(phi) * Math.sin(theta);
      var sz = sr * Math.cos(phi);
      starPositions[i * 3] = sx;
      starPositions[i * 3 + 1] = sy;
      starPositions[i * 3 + 2] = sz;
    }
    starGeometry.setAttribute(
      "position",
      new THREE.BufferAttribute(starPositions, 3)
    );
    var starMaterial = new THREE.PointsMaterial({
      color: 0x3f76ff,
      size: 0.02,
      transparent: true,
      opacity: 0.8,
    });
    var stars = new THREE.Points(starGeometry, starMaterial);
    scene.add(stars);

    // 自适应窗口大小
    function onResize() {
      if (!container) return;
      var w = container.clientWidth || width;
      var h = container.clientHeight || height;
      camera.aspect = w / h;
      camera.updateProjectionMatrix();
      renderer.setSize(w, h);
    }
    window.addEventListener("resize", onResize);

    // 动画循环
    var lastTime = performance.now();

    function animate() {
      requestAnimationFrame(animate);

      var now = performance.now();
      var delta = (now - lastTime) / 1000;
      lastTime = now;

      // 地球缓慢自转
      globeGroup.rotation.y += delta * 0.25;

      // 星辰慢速旋转，增强空间感
      stars.rotation.y -= delta * 0.05;

      // 节点呼吸效果
      var t = now / 1000;
      nodes.forEach(function (n) {
        var s = n.baseScale * (1 + 0.6 * Math.sin(t * 2.5 + n.phase));
        n.mesh.scale.set(s, s, s);
      });

      renderer.render(scene, camera);
    }

    animate();
  }

  if (document.readyState === "loading") {
    document.addEventListener("DOMContentLoaded", initGlobe);
  } else {
    initGlobe();
  }
})();