// 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(40, width / height, 0.1, 1000);
    // 初始视角，具体距离在 globe 准备好后根据半径自动调整
    camera.position.set(0, 0.2, 8.0);
    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);

    // 节点数据示例（可替换为真实机房经纬度，至少 15 个）
    var nodes = [
      { name: "Beijing", lat: 39.9, lng: 116.4 },
      { name: "Shanghai", lat: 31.2, lng: 121.5 },
      { name: "Guangzhou", lat: 23.1, lng: 113.3 },
      { name: "Shenzhen", lat: 22.5, lng: 114.1 },
      { name: "Hong Kong", lat: 22.3, lng: 114.2 },
      { name: "Singapore", lat: 1.3, lng: 103.8 },
      { name: "Tokyo", lat: 35.7, lng: 139.7 },
      { name: "Osaka", lat: 34.7, lng: 135.5 },
      { name: "Seoul", lat: 37.5, lng: 126.9 },
      { name: "Sydney", lat: -33.9, lng: 151.2 },
      { name: "Mumbai", lat: 19.0, lng: 72.8 },
      { name: "Frankfurt", lat: 50.1, lng: 8.7 },
      { name: "London", lat: 51.5, lng: -0.1 },
      { name: "Paris", lat: 48.9, lng: 2.4 },
      { name: "New York", lat: 40.7, lng: -74.0 },
      { name: "San Francisco", lat: 37.8, lng: -122.4 }
    ];

    // 基于节点构造“飞行轨迹”连接数据（startLat/startLng -> endLat/endLng）
    function buildArcsFromNodes(list) {
      var arcs = [];
      if (!Array.isArray(list) || list.length < 2) {
        return arcs;
      }
      // 简单策略：每个节点连接到后面第 step 个节点，形成环状主干网络
      var step = Math.max(1, Math.floor(list.length / 3));
      list.forEach(function (src, idx) {
        var dst = list[(idx + step) % list.length];
        if (!dst || (dst.lat === src.lat && dst.lng === src.lng)) {
          return;
        }
        arcs.push({
          startLat: src.lat,
          startLng: src.lng,
          endLat: dst.lat,
          endLng: dst.lng,
          // 统一使用偏青色的轨迹，贴合云服务器 / CDN 的科技感
          color: "#38BDF8",
        });
      });
      return arcs;
    }

    // three-globe 实例：使用空心陆地多边形（hollow globe 风格）
    var globe = new ThreeGlobe({
      waitForGlobeReady: true,
      animateIn: true,
    })
      // 不使用 three-globe 内置球体贴图，只保留大气层，陆地轮廓由 polygons 层绘制
      .showGlobe(false)
      .showAtmosphere(false)
      .atmosphereColor("#2b9fff")
      .atmosphereAltitude(0.18)
      .showGraticules(false);

    scene.add(globe);

    // 构造并应用“节点连接 + 飞行轨迹”效果
    var arcs = buildArcsFromNodes(nodes);
    if (typeof globe.arcsData === "function" && arcs.length) {
      globe.arcsData(arcs);
      if (typeof globe.arcColor === "function") {
        globe.arcColor(function (d) {
          return d.color || "#38BDF8";
        });
      }
      if (typeof globe.arcAltitude === "function") {
        globe.arcAltitude(0.2);
      }
      if (typeof globe.arcStroke === "function") {
        globe.arcStroke(0.7);
      }
      // 使用虚线 + 动画时间制造“飞行”感
      if (typeof globe.arcDashLength === "function") {
        globe.arcDashLength(0.35);
      }
      if (typeof globe.arcDashGap === "function") {
        globe.arcDashGap(0.8);
      }
      if (typeof globe.arcDashInitialGap === "function") {
        globe.arcDashInitialGap(function () {
          return Math.random();
        });
      }
      if (typeof globe.arcDashAnimateTime === "function") {
        globe.arcDashAnimateTime(function () {
          // 4~7 秒一圈，避免所有轨迹节奏完全一致
          return 4000 + Math.random() * 3000;
        });
      }
    }

    // 告诉 three-globe 当前渲染器的实际尺寸，避免默认按全窗口大小计算导致比例失真
    if (typeof globe.rendererSize === "function") {
      globe.rendererSize(new THREE.Vector2(width, height));
    }

    // 在 globe 初始化完成后，根据实际半径自动调整相机距离，保证整球落在视野内
    if (typeof globe.onGlobeReady === "function" && typeof globe.getGlobeRadius === "function") {
      globe.onGlobeReady(function () {
        var r = globe.getGlobeRadius(); // three-globe 内部使用的球半径
        // 经验：以半径的约 3 倍距离拍摄，配合 40° 视角，可以完整显示球体并留一定留白
        var dist = r * 3.2;
        camera.position.set(0, 0.2, dist);
        camera.lookAt(0, 0, 0);

        // 在陆地多边形下方放置一个略小的球体作为“海洋”，用白色突出球体轮廓
        // 颜色和透明度可以在这里调整
        var oceanGeom = new THREE.SphereGeometry(r * 0.99, 64, 64);
        var oceanMat = new THREE.MeshPhongMaterial({
          color: "#FFFFFF",      // 海洋/球体底色：白色（可改成其他颜色）
          transparent: true,
          opacity: 1,          // 透明度：越接近 1 越实
          shininess: 40,
          side: THREE.FrontSide,
        });
        var oceanMesh = new THREE.Mesh(oceanGeom, oceanMat);
        globe.add(oceanMesh);

        // 在节点位置放置小型静态“节点点”
        var nodeGeom = new THREE.SphereGeometry(r * 0.02, 16, 16);
        var nodeMat = new THREE.MeshBasicMaterial({
          color: "#38BDF8",
          transparent: true,
          opacity: 0.9,
        });

        // 通知 three-globe 当前视角，用于部分图层的内部计算
        if (typeof globe.setPointOfView === "function") {
          globe.setPointOfView(camera);
        }

        // 使用 globe 的工具方法，将经纬度转换为球面上的 3D 坐标
        var hasGetCoords = typeof globe.getCoords === "function";
        nodes.forEach(function (n) {
          var pos;
          if (hasGetCoords) {
            // altitude 略高于球面，避免被多边形遮挡
            pos = globe.getCoords(n.lat, n.lng, 0.02);
          } else {
            // 兼容降级：简单根据半径和经纬度计算
            var phi = (90 - n.lat) * (Math.PI / 180);
            var theta = (n.lng + 180) * (Math.PI / 180);
            var rr = r * 1.02;
            pos = {
              x: -rr * Math.sin(phi) * Math.cos(theta),
              z: rr * Math.sin(phi) * Math.sin(theta),
              y: rr * Math.cos(phi)
            };
          }

          var nodeMesh = new THREE.Mesh(nodeGeom, nodeMat);
          nodeMesh.position.set(pos.x, pos.y, pos.z);
          globe.add(nodeMesh);
        });
      });
    }

    // 按 hollow-globe 风格加载陆地多边形，绘制空心地球轮廓
    (function loadLandPolygons() {
      if (typeof topojson === "undefined") {
        console.warn(
          "[Globe] topojson-client is undefined, unable to render hollow globe polygons"
        );
        return;
      }

      // 请确保 /web/BlackFruit-web/assets/data/land-110m.json 存在，
      // 内容为你刚才提供的 Topology JSON。
      fetch("/web/BlackFruit-web/assets/data/land-110m.json")
        .then(function (res) {
          return res.json();
        })
        .then(function (landTopo) {
          try {
            var landGeo = topojson.feature(
              landTopo,
              landTopo.objects.land
            ).features;

            globe
              .polygonsData(landGeo)
              .polygonCapMaterial(
                new THREE.MeshLambertMaterial({
                  // 更亮、更偏青的科技蓝陆地，与轨迹/节点颜色统一
                  color: "#38BDF8",
                  transparent: true,
                  opacity: 0.75,
                  side: THREE.DoubleSide,
                })
              )
              .polygonSideColor(function () {
                return "rgba(0,0,0,0)";
              });
          } catch (e) {
            console.warn("[Globe] failed to parse land-110m topology:", e);
          }
        })
        .catch(function (err) {
          console.warn(
            "[Globe] failed to load /web/BlackFruit-web/assets/data/land-110m.json:",
            err
          );
        });
    })();

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

    // 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);
      // 同步 three-globe 对 renderer 尺寸的感知，保证缩放比例一致
      if (typeof globe.rendererSize === "function") {
        globe.rendererSize(new THREE.Vector2(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;

      renderer.render(scene, camera);
    }

    animate();
  }

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