// 3D 地球效果（首页 banner 右侧）基于 three-globe
// 依赖：全局 THREE 和 ThreeGlobe（在 index.html 中通过 CDN 引入）

(function () {
  function initGlobe() {
    var container = document.getElementById("bannerGlobe");
    if (!container) {
      console.warn("[Globe] bannerGlobe container not found");
      return;
    }
    if (typeof THREE === "undefined") {
      console.warn(
        "[Globe] THREE is undefined, please ensure three.min.js is loaded"
      );
      return;
    }
    if (typeof ThreeGlobe === "undefined") {
      console.warn(
        "[Globe] ThreeGlobe is undefined, please ensure three-globe.min.js is loaded"
      );
      return;
    }

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

    // 基础 Three.js 场景
    var scene = new THREE.Scene();

    var camera = new THREE.PerspectiveCamera(45, width / height, 0.1, 1000);
    // 稍微偏右俯视一点
    camera.position.set(0, 0.4, 4.0);
    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
    container.appendChild(renderer.domElement);

    // 柔和光照
    var ambient = new THREE.AmbientLight(0xffffff, 0.65);
    scene.add(ambient);
    var dirLight = new THREE.DirectionalLight(0xffffff, 0.9);
    dirLight.position.set(5, 3, 5);
    scene.add(dirLight);

    // 示例节点数据（可后续替换为真实机房经纬度）
    var nodes = [
      { name: "Beijing", lat: 39.9, lng: 116.4 },
      { name: "Shanghai", lat: 31.2, lng: 121.5 },
      { name: "Hong Kong", lat: 22.5, lng: 114.1 },
      { name: "Singapore", lat: 1.3, lng: 103.8 },
      { name: "San Francisco", lat: 37.8, lng: -122.4 },
      { name: "Berlin", lat: 52.5, lng: 13.4 },
      { name: "Tokyo", lat: 35.7, lng: 139.7 },
    ];

    // 示例 arcs：从北京发出到其他节点
    var arcs = nodes
      .filter(function (n) {
        return n.name !== "Beijing";
      })
      .map(function (n) {
        return {
          startLat: 39.9,
          startLng: 116.4,
          endLat: n.lat,
          endLng: n.lng,
        };
      });

    // three-globe 实例（仅使用其数据层，大气层和坐标系）
    var globe = new ThreeGlobe({
      waitForGlobeReady: true,
      animateIn: true,
    })
      // 隐藏 three-globe 默认球体，我们自己画一个实心地球
      .showGlobe(false)
      .showAtmosphere(true)
      .atmosphereColor("#2b9fff")
      .atmosphereAltitude(0.18)
      .showGraticules(false)
      // 节点柱状体
      .pointsData(nodes)
      .pointColor(function () {
        return "#5ad8ff";
      })
      .pointAltitude(0.06)
      .pointRadius(0.32)
      .pointsTransitionDuration(1000)
      // 弧线
      .arcsData(arcs)
      .arcColor(function () {
        return ["#5ad8ff", "#ffffff"];
      })
      .arcAltitude(0.35)
      .arcStroke(0.45)
      .arcDashLength(0.6)
      .arcDashGap(0.25)
      .arcDashAnimateTime(2600);

    scene.add(globe);

    // 自绘一个实心地球球体，避免默认球体材质透明或贴图问题
    try {
      var earthRadius = 1; // three-globe 使用的半径单位
      var earthGeometry = new THREE.SphereGeometry(earthRadius, 64, 64);
      var earthMaterial = new THREE.MeshPhongMaterial({
        color: new THREE.Color("#163a5f"),    // 基础色：深蓝
        emissive: new THREE.Color("#040915"), // 自发光：微亮
        specular: new THREE.Color("#3aaefc"), // 高光：亮蓝
        shininess: 40,
        transparent: false,
        opacity: 1,
      });
      var earthMesh = new THREE.Mesh(earthGeometry, earthMaterial);
      // 将地球球体挂到 three-globe 对象上，保证与节点/弧线共用坐标系
      globe.add(earthMesh);
    } catch (e) {
      console.warn("[Globe] failed to create custom earth sphere:", e);
    }

    // 暴露给调试用
    if (typeof window !== "undefined") {
      window.__globe = globe;
    }

    // 星辰背景（简单加一点点空间感）
    var starGeometry = new THREE.BufferGeometry();
    var starCount = 600;
    var starPositions = new Float32Array(starCount * 3);
    for (var i = 0; i < starCount; i++) {
      var sr = 10 + Math.random() * 5;
      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: 0.08,
      transparent: true,
      opacity: 0.7,
    });
    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;

      // 地球自转
      globe.rotation.y += delta * 0.25;
      // 星空轻微旋转
      stars.rotation.y -= delta * 0.03;

      renderer.render(scene, camera);
    }

    animate();
  }

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