import {
  Vector3,
  CubeTextureLoader,
  DirectionalLight,
  AmbientLight,
  Fog,
  Color,
  MathUtils,
  DoubleSide,
} from "three";
import { MapControls } from "three/examples/jsm/controls/MapControls.js";

import GeoJSON from "ol/format/GeoJSON.js";
import VectorSource from "ol/source/Vector.js";
import { createXYZ } from "ol/tilegrid.js";
import { tile } from "ol/loadingstrategy.js";

import Instance from "@giro3d/giro3d/core/Instance.js";
import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import WmtsSource from "@giro3d/giro3d/sources/WmtsSource.js";
import ColorLayer from "@giro3d/giro3d/core/layer/ColorLayer.js";
import ElevationLayer from "@giro3d/giro3d/core/layer/ElevationLayer.js";
// NOTE: changing the imported name because we use the native `Map` object in this example.
import Giro3dMap from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import BilFormat from "@giro3d/giro3d/formats/BilFormat.js";
import FeatureCollection from "@giro3d/giro3d/entities/FeatureCollection.js";

Instance.registerCRS(
  "EPSG:2154",
  "+proj=lcc +lat_0=46.5 +lon_0=3 +lat_1=49 +lat_2=44 +x_0=700000 +y_0=6600000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs +type=crs",
);
Instance.registerCRS(
  "IGNF:WGS84G",
  'GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]]',
);

const SKY_COLOR = new Color(0xf1e9c6);

const instance = new Instance({
  target: "view",
  crs: "EPSG:2154",
  backgroundColor: SKY_COLOR,
});

const extent = new Extent(
  "EPSG:2154",
  -111629.52,
  1275028.84,
  5976033.79,
  7230161.64,
);

// create a map
const map = new Giro3dMap({
  extent,
  backgroundColor: "gray",
  hillshading: {
    enabled: true,
    elevationLayersOnly: true,
  },
  discardNoData: true,
  side: DoubleSide,
});

instance.add(map);

const noDataValue = -1000;

const url =
  "https://data.geopf.fr/wmts?SERVICE=WMTS&VERSION=1.0.0&REQUEST=GetCapabilities";

// Let's build the elevation layer from the WMTS capabilities
WmtsSource.fromCapabilities(url, {
  layer: "ELEVATION.ELEVATIONGRIDCOVERAGE.HIGHRES",
  format: new BilFormat(),
  noDataValue,
})
  .then((elevationWmts) => {
    map.addLayer(
      new ElevationLayer({
        name: "elevation",
        extent: map.extent,
        // We don't need the full resolution of terrain
        // because we are not using any shading. This will save a lot of memory
        // and make the terrain faster to load.
        resolutionFactor: 0.25,
        minmax: { min: 0, max: 5000 },
        noDataOptions: {
          replaceNoData: false,
        },
        source: elevationWmts,
      }),
    );
  })
  .catch(console.error);

// Let's build the color layer from the WMTS capabilities
WmtsSource.fromCapabilities(url, {
  layer: "HR.ORTHOIMAGERY.ORTHOPHOTOS",
})
  .then((orthophotoWmts) => {
    map.addLayer(
      new ColorLayer({
        name: "color",
        extent: map.extent,
        source: orthophotoWmts,
      }),
    );
  })
  .catch(console.error);

const buildingSource = new VectorSource({
  format: new GeoJSON(),
  url: function url(bbox) {
    return `${
      "https://data.geopf.fr/wfs/ows" +
      "?SERVICE=WFS" +
      "&VERSION=2.0.0" +
      "&request=GetFeature" +
      "&typename=BDTOPO_V3:batiment" +
      "&outputFormat=application/json" +
      "&SRSNAME=EPSG:2154" +
      "&startIndex=0" +
      "&bbox="
    }${bbox.join(",")},EPSG:2154`;
  },
  strategy: tile(createXYZ({ tileSize: 512 })),
});

const hoverColor = new Color("yellow");

// This is the style function that will assign a different style depending on a feature's attribute.
// The `feature` argument is an OpenLayers feature.
const buildingStyle = (feature) => {
  const properties = feature.getProperties();
  let fillColor = "#FFFFFF";

  const hovered = properties.hovered ?? false;
  const clicked = properties.clicked ?? false;

  switch (properties.usage_1) {
    case "Industriel":
      fillColor = "#f0bb41";
      break;
    case "Agricole":
      fillColor = "#96ff0d";
      break;
    case "Religieux":
      fillColor = "#41b5f0";
      break;
    case "Sportif":
      fillColor = "#ff0d45";
      break;
    case "Résidentiel":
      fillColor = "#cec8be";
      break;
    case "Commercial et services":
      fillColor = "#d8ffd4";
      break;
  }

  const fill = clicked
    ? "yellow"
    : hovered
      ? new Color(fillColor).lerp(hoverColor, 0.2) // Let's use a slightly brighter color for hover
      : fillColor;

  return {
    fill: {
      color: fill,
    },
    stroke: {
      color: clicked ? "yellow" : hovered ? "white" : "black",
      lineWidth: clicked ? 5 : undefined,
    },
  };
};

// Let's compute the extrusion offset of building polygons to give them walls.
const extrusionOffsetCallback = (feature) => {
  const properties = feature.getProperties();
  const buildingHeight = properties["hauteur"];
  const extrusionOffset = -buildingHeight;

  if (Number.isNaN(extrusionOffset)) {
    return null;
  }
  return extrusionOffset;
};

const featureCollection = new FeatureCollection({
  source: buildingSource,
  extent,
  extrusionOffset: extrusionOffsetCallback,
  style: buildingStyle,
  minLevel: 11,
  maxLevel: 11,
});

instance.add(featureCollection);

// To make sure that the buildings remain correctly displayed whenever
// one entity become transparent (i.e it's opacity is less than 1), we need
// to set the render of the feature collection to be greater than the map's.
map.renderOrder = 0;
featureCollection.renderOrder = 1;

// Add a sunlight
const sun = new DirectionalLight("#ffffff", 2);
sun.position.set(1, 0, 1).normalize();
sun.updateMatrixWorld(true);
instance.scene.add(sun);

// We can look below the floor, so let's light also a bit there
const sun2 = new DirectionalLight("#ffffff", 0.5);
sun2.position.set(0, 1, 1);
sun2.updateMatrixWorld();
instance.scene.add(sun2);

// Add an ambient light
const ambientLight = new AmbientLight(0xffffff, 0.2);
instance.scene.add(ambientLight);

instance.view.camera.position.set(
  913349.2364044407,
  6456426.459171033,
  1706.0108044011636,
);

const lookAt = new Vector3(913896, 6459191, 200);
instance.view.camera.lookAt(lookAt);

const controls = new MapControls(instance.view.camera, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.4;
controls.target.copy(lookAt);
controls.saveState();
instance.view.setControls(controls);

// add a skybox background
const cubeTextureLoader = new CubeTextureLoader();
cubeTextureLoader.setPath("image/skyboxsun25deg_zup/");
const cubeTexture = cubeTextureLoader.load([
  "px.jpg",
  "nx.jpg",
  "py.jpg",
  "ny.jpg",
  "pz.jpg",
  "nz.jpg",
]);

instance.scene.background = cubeTexture;

// information on click
const resultTable = document.getElementById("results");

let lastCameraPosition = new Vector3(0, 0, 0);
const tempVec3 = new Vector3(0, 0, 0);

function truncate(value, length) {
  if (value == null) {
    return null;
  }

  const text = `${value}`;

  if (text.length < length) {
    return text;
  }

  return text.substring(0, length) + "…";
}

// Fill the attribute table with the objects' attributes.
function fillTable(objects) {
  resultTable.innerHTML = "";
  document.getElementById("card").style.display =
    objects.length > 0 ? "block" : "none";

  for (const obj of objects) {
    if (!obj.userData.feature) {
      continue;
    }
    const p = obj.userData.feature.getProperties();

    const entries = [];
    for (const [key, value] of Object.entries(p)) {
      if (key !== "geometry" && key !== "clicked" && key !== "hovered") {
        const entry = `<tr>
                <td title="${key}"><code>${truncate(key, 12)}</code></td>
                <td title="${value}">${truncate(value, 18) ?? "<code>null</code>"}</td>
                </tr>`;
        entries.push(entry);
      }
    }

    resultTable.innerHTML += `
        <table class="table table-sm table-striped">
            <thead>
                <tr>
                    <th scope="col">Name</th>
                    <th scope="col">Value</th>
                </tr>
            </thead>
            <tbody>
                ${entries.join("")}
            </tbody>
        </table>
    `;
  }
}

const previousHovered = [];
const previousClicked = [];
const objectsToUpdate = [];

function pick(e, click) {
  const pickedObjects = instance.pickObjectsAt(e, {
    where: [featureCollection],
  });

  if (click) {
    previousClicked.forEach((obj) =>
      obj.userData.feature.set("clicked", false),
    );
  } else {
    previousHovered.forEach((obj) =>
      obj.userData.feature.set("hovered", false),
    );
  }

  const property = click ? "clicked" : "hovered";

  objectsToUpdate.length = 0;

  if (pickedObjects.length > 0) {
    const picked = pickedObjects[0];
    const obj = picked.object;
    const { feature } = obj.userData;

    feature.set(property, true);

    objectsToUpdate.push(obj);
  }

  if (click) {
    fillTable(objectsToUpdate);
  }

  // To avoid updating all the objects and lose a lot of performance,
  // we only update the objects that have changed.
  const updatedObjects = [
    ...previousHovered,
    ...previousClicked,
    ...objectsToUpdate,
  ];
  if (click) {
    previousClicked.splice(0, previousClicked.length, ...objectsToUpdate);
  } else {
    previousHovered.splice(0, previousHovered.length, ...objectsToUpdate);
  }

  if (updatedObjects.length > 0) {
    featureCollection.updateStyles(updatedObjects);
  }
}

const hover = (e) => pick(e, false);
const click = (e) => pick(e, true);

instance.domElement.addEventListener("mousemove", hover);
instance.domElement.addEventListener("click", click);

const DOWN_VECTOR = new Vector3(0, 0, -1);
const EARTH_RADIUS = 6_3781_000;
const tmpVec3 = new Vector3();

const fog = new Fog(SKY_COLOR, 1, 2);
instance.scene.fog = fog;

function processFogAndClippingPlanes(camera) {
  // Compute the tilt, in radians, of the camera.
  const tilt = DOWN_VECTOR.angleTo(camera.camera.getWorldDirection(tmpVec3));

  const altitude = MathUtils.clamp(camera.camera.position.z, 20, 100000);

  const maxFarPlane = 9_999_999;
  const actualTilt = MathUtils.clamp(tilt, 0, Math.PI / 3);
  const horizon = Math.sqrt(2 * altitude * EARTH_RADIUS) * 0.2;

  camera.maxFarPlane = MathUtils.mapLinear(
    actualTilt,
    0,
    Math.PI / 3,
    maxFarPlane,
    horizon,
  );
  fog.far = camera.far;
  fog.near = MathUtils.lerp(camera.near, camera.far, 0.2);
}

instance.addEventListener("after-camera-update", (event) =>
  processFogAndClippingPlanes(event.camera),
);

processFogAndClippingPlanes(instance.view);

Inspector.attach("inspector", instance);

<!doctype html>
<html lang="en">
  <head>
    <title>IGN data</title>
    <meta charset="UTF-8" />
    <meta name="name" content="ign_data" />
    <meta
      name="description"
      content="Use data sources provided by the french geographic provider (IGN)."
    />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />

    <link rel="icon" href="https://giro3d.org/images/favicon.svg" />
    <link
      href="https://giro3d.org/assets/bootstrap-custom.css"
      rel="stylesheet"
    />
    <script src="https://giro3d.org/assets/bootstrap.bundle.min.js"></script>
    <link
      rel="stylesheet"
      type="text/css"
      href="https://giro3d.org/latest/examples/css/example.css"
    />
  </head>

  <body>
    <div id="view" class="m-0 p-0 w-100 h-100"></div>
    <div
      id="inspector"
      class="position-absolute top-0 start-0 mh-100 overflow-auto"
    ></div>

    <div
      class="side-pane-with-status-bar pe-none"
      style="display: none"
      id="card"
    >
      <div class="card">
        <h5 class="card-header">Building informations</h5>

        <!-- tooltip -->
        <span
          class="badge bg-secondary position-absolute top-0 end-0 m-2"
          data-bs-toggle="popover"
          data-bs-content="pickingHelper"
          >?</span
        >
        <p class="card-text d-none" id="pickingHelper">
          These informations are the feature properties embedded in the return
          value from the WFS server
        </p>

        <div class="card-body">
          <!-- Result table -->
          <div id="results"></div>
        </div>
      </div>
    </div>

    <script type="module" src="index.js"></script>
    <script>
      /* activate popovers */
      const popoverTriggerList = [].slice.call(
        document.querySelectorAll('[data-bs-toggle="popover"]'),
      );
      popoverTriggerList.map(
        // bootstrap is used as script in the template, disable warning about undef
        // eslint-disable-next-line no-undef
        (popoverTriggerEl) =>
          new bootstrap.Popover(popoverTriggerEl, {
            trigger: "hover",
            placement: "left",
            content: document.getElementById(
              popoverTriggerEl.getAttribute("data-bs-content"),
            ).innerHTML,
            html: true,
          }),
      );
    </script>
  </body>
</html>

{
    "name": "ign_data",
    "dependencies": {
        "@giro3d/giro3d": "0.40.0"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}