let boundaries = {
  type: "FeatureCollection",
  name: "boundaries",
  crs: { type: "name", properties: { name: "urn:ogc:def:crs:OGC:1.3:CRS84" } },
  features: [
    {
      type: "Feature",
      properties: {},
      geometry: {
        type: "MultiPolygon",
        coordinates: [ [ [ [ 110.763, 41.376 ], [ 110.823, 41.381 ], [ 110.815, 41.357 ], [ 110.944, 41.317 ], [ 110.978, 41.346 ], [ 111.026, 41.299 ], [ 111.085, 41.285 ], [ 111.096, 41.306 ], [ 111.232, 41.238 ], [ 111.273, 41.289 ], [ 111.439, 41.327 ], [ 111.724, 41.309 ], [ 111.833, 41.252 ], [ 111.822, 41.216 ], [ 111.862, 41.204 ], [ 111.874, 41.129 ], [ 112.027, 41.046 ], [ 112.011, 41.003 ], [ 112.035, 40.968 ], [ 112.138, 40.938 ], [ 112.178, 40.818 ], [ 112.144, 40.761 ], [ 112.086, 40.738 ], [ 112.124, 40.697 ], [ 112.108, 40.657 ], [ 112.038, 40.654 ], [ 112.092, 40.587 ], [ 112.046, 40.559 ], [ 112.218, 40.448 ], [ 112.259, 40.391 ], [ 112.229, 40.354 ], [ 112.264, 40.356 ], [ 112.305, 40.253 ], [ 111.964, 39.795 ], [ 111.925, 39.611 ], [ 111.829, 39.619 ], [ 111.777, 39.588 ], [ 111.64, 39.643 ], [ 111.511, 39.663 ], [ 111.43, 39.642 ], [ 111.435, 39.67 ], [ 111.358, 39.721 ], [ 111.366, 39.789 ], [ 111.439, 39.896 ], [ 111.405, 40.044 ], [ 111.308, 40.151 ], [ 111.039, 40.27 ], [ 111.024, 40.31 ], [ 111.108, 40.33 ], [ 111.121, 40.382 ], [ 110.953, 40.495 ], [ 110.895, 40.483 ], [ 110.837, 40.534 ], [ 110.874, 40.585 ], [ 110.796, 40.611 ], [ 110.78, 40.79 ], [ 110.705, 40.805 ], [ 110.739, 40.917 ], [ 110.623, 40.941 ], [ 110.672, 41.053 ], [ 110.639, 41.1 ], [ 110.65, 41.164 ], [ 110.554, 41.224 ], [ 110.559, 41.261 ], [ 110.512, 41.291 ], [ 110.547, 41.288 ], [ 110.569, 41.331 ], [ 110.629, 41.31 ], [ 110.719, 41.385 ], [ 110.763, 41.376 ] ] ] ] } }
  ]
};

let points = turf.randomPoint(30, { bbox: turf.bbox(boundaries) });

turf.featureEach(points, function (currentFeature, featureIndex) {
  currentFeature.properties = { value: (Math.random() * 100).toFixed(2) };
});
console.log(points);

var interpolate_options = {
  gridType: "points",
  property: "value",
  units: "degrees",
  weight: 10
};
let grid = turf.interpolate(points, 0.05, interpolate_options);
grid.features.map((i) => (i.properties.value = i.properties.value.toFixed(2)));

var isobands_options = {
  zProperty: "value",
  commonProperties: {
    "fill-opacity": 0.8
  },
  breaksProperties: [
    {fill: "#e3e3ff"},
    {fill: "#c6c6ff"},
    {fill: "#a9aaff"},
    {fill: "#8e8eff"},
    {fill: "#7171ff"},
    {fill: "#5554ff"},
    {fill: "#3939ff"},
    {fill: "#1b1cff"},
    {fill: "#1500ff"}
  ]
};
let isobands = turf.isobands(
  grid,
  [1, 10, 20, 30, 50, 70, 100],
  isobands_options
);

boundaries = turf.flatten(boundaries);
isobands = turf.flatten(isobands);

let features = [];

isobands.features.forEach(function (layer1) {

  boundaries.features.forEach(function (layer2) {
    let intersection = null;
    try {
      intersection = turf.intersect(layer1, layer2);
    } catch (e) {
      layer1 = turf.buffer(layer1, 0);
      intersection = turf.intersect(layer1, layer2);
    }
    if (intersection != null) {
      intersection.properties = layer1.properties;
      intersection.id = Math.random() * 100000;
      features.push(intersection);
    }
  });
});
let intersection = turf.featureCollection(features);


// 可视化及交互部分

mapboxgl.accessToken =
  "pk.eyJ1Ijoic2hldmF3ZW4iLCJhIjoiY2lwZXN2OGlvMDAwMXR1bmh0aG5vbDFteiJ9.2fsD37adZ1hC2MUU-2xByA";
var map = new mapboxgl.Map({
  container: "map",
  style: "mapbox://styles/mapbox/streets-v11",
  bounds: turf.bbox(boundaries)
});

map.on("load", function () {
  // 逐个添加过程中的数据
  map.addSource("boundaries", {
    type: "geojson",
    data: boundaries
  });
  map.addSource("points", {
    type: "geojson",
    data: points
  });
  map.addSource("grid", {
    type: "geojson",
    data: grid
  });
  map.addSource("isobands", {
    type: "geojson",
    data: isobands
  });
  map.addSource("intersection", {
    type: "geojson",
    data: intersection
  });
  // 逐个添加过程中形成的图层
  map.addLayer({
    id: "points",
    type: "symbol",
    source: "points",
    layout: {
      "text-field": ["get", "value"],
      "text-font": ["Open Sans Semibold", "Arial Unicode MS Bold"],
      "text-offset": [0, 0.6],
      "text-anchor": "top"
    }
  });
  map.addLayer({
    id: "circles",
    type: "circle",
    source: "points",
    'paint': {
      'circle-radius': 2,
      'circle-color': '#007cbf'
    }
  });
  map.addLayer({
    id: "grid",
    type: "symbol",
    source: "grid",
    layout: {
      "text-field": ["get", "value"],
      "visibility": "none"
    },
    paint: {
      "text-color": "#f00"
    }
  });
  
  map.addLayer({
    id: "isobands",
    type: "fill",
    source: "isobands",
    layout: {
      "visibility": "none"
    },
    paint: {
      "fill-color": ["get", "fill"],
      "fill-opacity": 0.8
    }
  })
  map.addLayer({
    id: "boundaries",
    type: "line",
    source: "boundaries",
    layout: {},
    paint: {
      "line-width": 2,
      "line-color": "#4264fb"
    }
  })
  map.addLayer({
    id: "intersection",
    type: "fill",
    source: "intersection",
    layout: {},
    paint: {
      "fill-color": ["get", "fill"],
      "fill-opacity": [
        "case",
        ["boolean", ["feature-state", "hover"], false],
        0.8,
        0.5
      ],
      "fill-outline-color": [
        "case",
        ["boolean", ["feature-state", "hover"], false],
        "#000",
        "#fff"
      ]
    }
  });
  
  // 右上角的导航菜单
  var layers = document.getElementById("menu-ui");
  var toggleableLayerIds = ["points", "grid", "isobands", "intersection"];

  for (var i = 0; i < toggleableLayerIds.length; i++) {
    var id = toggleableLayerIds[i];

    var link = document.createElement("a");
    link.href = "#";
    link.className = map.getLayoutProperty(id, "visibility") === "none" ? "" : "active";
    link.textContent = id;

    link.onclick = function (e) {
      var clickedLayer = this.textContent;
      e.preventDefault();
      e.stopPropagation();

      var visibility = map.getLayoutProperty(clickedLayer, "visibility");
      visibility = visibility || "visible";

      if (visibility === "visible") {
        map.setLayoutProperty(clickedLayer, "visibility", "none");
        this.className = "";
      } else {
        this.className = "active";
        map.setLayoutProperty(clickedLayer, "visibility", "visible");
      }
    };

    layers.appendChild(link);
  }
});
var hoveredStateId = null;
map.on("mousemove", "intersection", function (e) {
  if (e.features.length > 0) {
    if (hoveredStateId) {
      map.setFeatureState(
        { source: "intersection", id: hoveredStateId },
        { hover: false }
      );
    }
    hoveredStateId = e.features[0].id;
    map.setFeatureState(
      { source: "intersection", id: hoveredStateId },
      { hover: true }
    );
  }
});