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

import OSM from "ol/source/OSM.js";

import Coordinates from "@giro3d/giro3d/core/geographic/Coordinates.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";
import Map from "@giro3d/giro3d/entities/Map.js";
import Inspector from "@giro3d/giro3d/gui/Inspector.js";
import BilFormat from "@giro3d/giro3d/formats/BilFormat.js";
import TiledImageSource from "@giro3d/giro3d/sources/TiledImageSource.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 mainInstance = new Instance({
  target: "view",
  crs: "EPSG:2154",
  backgroundColor: SKY_COLOR,
});

// create a map
const extent = new Extent(
  "EPSG:2154",
  -111629.52,
  1275028.84,
  5976033.79,
  7230161.64,
);
const map = new Map({
  extent,
  backgroundColor: "gray",
  hillshading: {
    enabled: true,
    elevationLayersOnly: true,
  },
  discardNoData: true,
});
mainInstance.add(map);

const noDataValue = -1000;

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

WmtsSource.fromCapabilities(capabilitiesUrl, {
  layer: "ELEVATION.ELEVATIONGRIDCOVERAGE.HIGHRES",
  format: new BilFormat(),
  noDataValue,
})
  .then((elevationWmts) => {
    map.addLayer(
      new ElevationLayer({
        name: "wmts_elevation",
        extent: map.extent,
        // We don't need the full resolution of terrain because we are not using any shading
        resolutionFactor: 0.25,
        minmax: { min: 0, max: 5000 },
        noDataOptions: {
          replaceNoData: false,
        },
        source: elevationWmts,
      }),
    );
  })
  .catch(console.error);

WmtsSource.fromCapabilities(capabilitiesUrl, {
  layer: "HR.ORTHOIMAGERY.ORTHOPHOTOS",
})
  .then((orthophotoWmts) => {
    map.addLayer(
      new ColorLayer({
        name: "wmts_orthophotos",
        extent: map.extent,
        source: orthophotoWmts,
      }),
    );
  })
  .catch(console.error);

mainInstance.view.camera.position.set(
  913349.2364044407,
  6456426.459171033,
  1706.0108044011636,
);
const lookAt = new Vector3(913896, 6459191, 200);
mainInstance.view.camera.lookAt(lookAt);
mainInstance.notifyChange(mainInstance.view.camera);

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

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",
]);

mainInstance.scene.background = cubeTexture;

/////////////////////////////// Minimap configuration //////////////////////////////////////////////

// The minimap is a regular Giro3D instance located in a <div> element in the top right corner
// of the window. Its configuration is very similar to the main view, with some important
// differences related to the camera and navigation.

// Create our minimap instance and attach it to the 'minimap' <div> element.
const minimapInstance = new Instance({
  target: "minimap",
  crs: "EPSG:3857", // Contrary to the main view, this minimap uses the Web mercator projection
});

// Set the minimap camera view width, in meters. This can be changed later when
// the user uses the mouse wheel on to zoom in/out.
const minimapCameraWidth = 2000;
const minimapCamera = new OrthographicCamera(
  -minimapCameraWidth / 2,
  minimapCameraWidth / 2,
  100,
  -100,
);

// We replace the default perspective camera of the minimap view by
// an orthographic camera, which is much more suitable for this kind of view.
minimapInstance.view.camera = minimapCamera;

// Let's create our minimap map with the same extent than the main map.
const minimap = new Map({
  extent: map.extent.as(minimapInstance.referenceCrs),
  // Since the map is flat (no terrain applied), we can use 1 segment per tile.
  segments: 1,
  backgroundColor: "black",
  terrain: false, // We can disable terrain because our map will be flat.
});

minimapInstance.add(minimap);

// We use an OpenStreetMap color layer for the minimap, because it's readable and fast to display.
const osmLayer = new ColorLayer({
  name: "osm",
  preloadImages: true,
  source: new TiledImageSource({ source: new OSM() }),
});

minimap.addLayer(osmLayer);

function synchronizeCameras() {
  const target = controls.target;

  // Since our minimap does not use the same projection as the main view (EPSG:2154),
  // we must convert the camera position into this projection (EPSG:3857).
  const srcProj = mainInstance.referenceCrs;
  const dstProj = minimapInstance.referenceCrs;
  const srcPosition = new Coordinates(srcProj, target.x, target.y);
  const position = srcPosition.as(dstProj);

  // Then we can assign the position to the camera, while still keeping a constant altitude.
  // The minimap camera "altitude" never changes because we are using an orthographic camera.
  // Changing this value will not change the size of objects rendered in this view.
  const MINIMAP_CAMERA_ALTITUDE = 10;
  minimapInstance.view.camera.position.set(
    position.x,
    position.y,
    MINIMAP_CAMERA_ALTITUDE,
  );

  // Instruct the minimap instance to render the view.
  minimapInstance.notifyChange(minimap);
}

// Synchronize the minimap camera position with the *target* of the main camera
mainInstance.addEventListener("after-camera-update", synchronizeCameras);

function handleMouseWheel(event) {
  const delta = event.wheelDelta;

  const absDelta = Math.abs(delta);
  const ZOOM_SPEED = MathUtils.mapLinear(absDelta, 0, 120, 1.01, 1.2);

  if (delta > 0) {
    minimapCamera.zoom *= ZOOM_SPEED;
  } else if (delta < 0) {
    minimapCamera.zoom /= ZOOM_SPEED;
  }

  minimapInstance.notifyChange(minimapCamera);

  // Prevent this event from bubbling and make the page scroll.
  event.preventDefault();
}

// Use the mouse wheel on the minimap view to set the zoom of the minimap camera.
// We use the 'wheel' event (careful not to use the non-standard 'mousewheel' event).
minimapInstance.domElement.addEventListener("wheel", handleMouseWheel);

Inspector.attach("inspector", mainInstance, { title: "main" });
Inspector.attach("inspector", minimapInstance, { title: "minimap" });

<!doctype html>
<html lang="en">
  <head>
    <title>Minimap</title>
    <meta charset="UTF-8" />
    <meta name="name" content="minimap" />
    <meta
      name="description"
      content="Illustrates the use of a secondary Giro3D instance to display a minimap."
    />
    <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">
      <div
        id="minimap"
        class="card m-1"
        style="
          width: 20rem;
          height: 14rem;
          overflow: hidden;
          border-radius: var(--bs-card-border-radius);
        "
      ></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": "minimap",
    "dependencies": {
        "@giro3d/giro3d": "0.41.0"
    },
    "devDependencies": {
        "vite": "^3.2.3"
    },
    "scripts": {
        "start": "vite",
        "build": "vite build"
    }
}