import { MathUtils } from "three/src/math/MathUtils.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 { Color, Vector3 } from "three";
import { MapControls } from "three/examples/jsm/controls/MapControls.js";

import Instance from "@giro3d/giro3d/core/Instance.js";
import Extent from "@giro3d/giro3d/core/geographic/Extent.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import FeatureCollection from "@giro3d/giro3d/entities/FeatureCollection.js";
import Coordinates from "@giro3d/giro3d/core/geographic/Coordinates";

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",
);

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

const instance = new Instance({
  target: "view",
  crs: extent.crs,
});

// This is a GeoJSON with the default crs EPSG:4326
const arrondissementSource = new VectorSource({
  format: new GeoJSON(),
  url: "./data/paris_arrondissements.geojson",
});

function getHue(area) {
  const minArea = 991153;
  const maxArea = 16372542;
  const hue = MathUtils.mapLinear(area, minArea, maxArea, 0.2, 0.8);

  return MathUtils.clamp(hue, 0, 1);
}

// Creates the entity. The features will automatically be reprojected before being displayed.
const arrondissements = new FeatureCollection({
  source: arrondissementSource,
  extent,
  ignoreZ: true,
  minLevel: 0,
  maxLevel: 0,
  style: (feature) => {
    // The style depends on the polygon's area
    const t = getHue(feature.get("surface"));
    const highlight = feature.get("highlight");
    const brightness = highlight ? 1 : 0.7;
    const color = new Color().setHSL(0, t, brightness * t, "srgb");

    return {
      fill: {
        color,
        depthTest: false,
        renderOrder: 1,
      },
      stroke: highlight
        ? {
            color: "white",
            depthTest: false,
            renderOrder: 2,
          }
        : null,
    };
  },
});
arrondissements.name = "arrondissements";
instance.add(arrondissements);

// Another GeoJSON in EPSG:3857
// Although this is non-standard in recent versions of
// the GeoJSON specification, OpenLayers and Giro3D still
// support GeoJSON files that have a different CRS than EPSG:4326.
const perimeterqaaSource = new VectorSource({
  format: new GeoJSON(),
  url: "./data/perimetreqaa.geojson",
});

const perimeterqaa = new FeatureCollection({
  source: perimeterqaaSource,
  extent,
  ignoreZ: true,
  minLevel: 0,
  maxLevel: 0,
  style: (feature) => {
    const highlight = feature.get("highlight");
    return {
      fill: {
        color: highlight ? "#5d914d" : "#41822d",
        depthTest: false,
        opacity: 0.7,
        renderOrder: 3,
      },
      stroke: {
        color: "#85f516",
        lineWidth: highlight ? 4 : 1,
        depthTest: false,
        renderOrder: 4,
      },
    };
  },
});
perimeterqaa.name = "perimeterqaa";
instance.add(perimeterqaa);

// A WFS source in EPSG:3857
const bdTopoSource = new VectorSource({
  format: new GeoJSON(),
  url: function url(bbox) {
    return `${
      "https://data.geopf.fr/wfs/ows" +
      "?SERVICE=WFS" +
      "&VERSION=2.0.0" +
      "&request=GetFeature" +
      "&typename=BDTOPO_V3:batiment" +
      "&outputFormat=application/json" +
      "&SRSNAME=EPSG:3857" +
      "&startIndex=0" +
      "&bbox="
    }${bbox.join(",")},EPSG:3857`;
  },
  strategy: tile(createXYZ({ tileSize: 512 })),
});
const buildings = new FeatureCollection({
  source: bdTopoSource,
  // we specify that FeatureCollection should reproject the features before displaying them
  dataProjection: "EPSG:3857",
  // We are working on a flat, 2D scene, so we must ignore the Z coordinate of features, if any.
  ignoreZ: true,
  extent,
  style: (feature) => {
    const properties = feature.getProperties();
    const highlighted = properties.highlight;
    let color = "#FFFFFF";

    if (highlighted) {
      color = "cyan";
    } else {
      if (properties.usage_1 === "Résidentiel") {
        color = "#9d9484";
      } else if (properties.usage_1 === "Commercial et services") {
        color = "#b0ffa7";
      }
    }
    return {
      fill: {
        color,
        depthTest: false,
        renderOrder: 5,
      },
      stroke: {
        color: "black",
        renderOrder: 6,
        depthTest: false,
      },
    };
  },
  minLevel: 11,
  maxLevel: 11,
});
buildings.name = "buildings";
instance.add(buildings);

const position = new Coordinates("EPSG:2154", 652212.5, 6860754.1, 27717.3);
const lookAtCoords = new Coordinates("EPSG:2154", 652338.3, 6862087.1, 200);
const lookAt = new Vector3(lookAtCoords.x, lookAtCoords.y, lookAtCoords.z);
instance.view.camera.position.set(position.x, position.y, position.z);
instance.view.camera.lookAt(lookAt);

const controls = new MapControls(instance.view.camera, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.2;
controls.target.copy(lookAt);
controls.saveState();
instance.view.setControls(controls);

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

let previousObjects = [];
const objectsToUpdate = [];

function createResultTable(values) {
  resultTable.innerHTML = "";

  for (const value of values) {
    const child = document.createElement("li");
    // child.classList.add('list-group-item');
    child.innerText = value;
    resultTable.appendChild(child);
  }
}

function pick(e) {
  instance.notifyChange();
  // pick objects
  const pickedObjects = instance.pickObjectsAt(e, {
    radius: 2,
    where: [arrondissements, perimeterqaa],
  });

  // Reset highlights
  previousObjects.forEach((o) => o.userData.feature.set("highlight", false));

  const tableValues = [];

  if (pickedObjects.length !== 0) {
    resultTable.innerHTML = "";

    for (const p of pickedObjects) {
      const obj = p.object;

      const feature = obj.userData.feature;
      const entity = obj.userData.parentEntity;

      objectsToUpdate.push(obj);

      if (entity === arrondissements) {
        tableValues.push(feature.get("l_ar"));
      }
      if (entity === perimeterqaa) {
        tableValues.push("Improved Accessibility Zone");
      }
      // highlight it
      feature.set("highlight", true);
    }
  }

  createResultTable(tableValues);

  instance.notifyChange([...previousObjects, ...objectsToUpdate]);
  previousObjects = [...objectsToUpdate];
  objectsToUpdate.length = 0;
}

instance.domElement.addEventListener("mousemove", pick);

Inspector.attach("inspector", instance);

<!doctype html>
<html lang="en">
  <head>
    <title>Reprojection of features as mesh</title>
    <meta charset="UTF-8" />
    <meta name="name" content="feature_collection_reprojection" />
    <meta
      name="description"
      content="Illustrates the automatic reprojection of vectors to match the instance&#39;s CRS."
    />
    <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/next/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" style="min-height: 9rem">
      <div class="card">
        <h5 class="card-header">Information</h5>

        <!-- tooltip -->
        <span
          class="badge bg-secondary position-absolute top-0 end-0 m-2"
          data-bs-toggle="popover"
          data-bs-content="tooltip"
          >?</span
        >

        <p class="card-text d-none" id="tooltip">
          Some informations embedded in the GeoJSON
        </p>

        <div class="card-body pe-none">
          <!-- Result table -->
          <ul style="width: 12rem" id="results"></ul>
        </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": "feature_collection_reprojection",
    "dependencies": {
        "@giro3d/giro3d": "git+https://gitlab.com/giro3d/giro3d.git"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}