import colormap from 'colormap';
import { Box3Helper, Color } from 'three';
import { MapControls } from 'three/examples/jsm/controls/MapControls.js';

import Extent from '@giro3d/giro3d/core/geographic/Extent.js';
import CogSource from '@giro3d/giro3d/sources/CogSource.js';
import Instance from '@giro3d/giro3d/core/Instance.js';
import ElevationLayer from '@giro3d/giro3d/core/layer/ElevationLayer';
import Map from '@giro3d/giro3d/entities/Map';
import Inspector from '@giro3d/giro3d/gui/Inspector.js';
import ColorMap, { ColorMapMode } from '@giro3d/giro3d/core/layer/ColorMap.js';



// Define projection that we will use (taken from https://epsg.io/26910, Proj4js section)
Instance.registerCRS(
    'EPSG:32742',
    '+proj=utm +zone=42 +south +datum=WGS84 +units=m +no_defs +type=crs',
);

const datasetExtent = new Extent(
    'EPSG:3857',
    -13581040.085,
    -13469591.026,
    5780261.83,
    5942165.048,
);

const extent = datasetExtent.clone().as('EPSG:32742');

// `viewerDiv` will contain Giro3D' rendering area (the canvas element)
const viewerDiv = document.getElementById('viewerDiv');

// Instantiate Giro3D
const instance = new Instance(viewerDiv, {
    crs: extent.crs(),
});

// Instantiate the camera
instance.camera.camera3D.position.set(1305865, 24791965, 243407);

// Instantiate the controls
const controls = new MapControls(instance.camera.camera3D, instance.domElement);
controls.enableDamping = true;
controls.dampingFactor = 0.2;
controls.target.set(1305865, 24791964, 1000);
instance.useTHREEControls(controls);

// Use an elevation COG with nodata values
const source = new CogSource({
    // https://pubs.er.usgs.gov/publication/ds904
    url: 'https://3d.oslandia.com/cog_data/COG_EPSG3857_USGS_13_n47w122_20220919.tif',
    crs: 'EPSG:3857',
});

const values = colormap({ colormap: 'viridis', nshades: 256 });
const colors = values.map(v => new Color(v));

const min = 263;
const max = 4347;

const colorMap = new ColorMap(colors, min, max, ColorMapMode.Elevation);

const noDataOptions = {
    alpha: 0,
    maxSearchDistance: Infinity,
    replaceNoData: true,
};

const elevationLayer = new ElevationLayer({
    name: 'elevation',
    extent,
    source,
    noDataOptions,
    colorMap,
    minmax: { min, max },
});

const map = new Map('map', {
    extent,
    doubleSided: true,
    backgroundOpacity: 0,
    hillshading: true,
    discardNoData: true,
    segments: 128,
});

instance.add(map);

map.addLayer(elevationLayer);

const box = extent.toBox3(min, min);
const boxHelper = new Box3Helper(box, new Color('yellow'));
instance.add(boxHelper);
boxHelper.updateMatrixWorld();

// Attach the inspector
Inspector.attach(document.getElementById('panelDiv'), instance);

// Bind events


const enableFillNoDataCheckbox = document.getElementById('enableFillNoData');
enableFillNoDataCheckbox.oninput = function oninput() {
    const state = enableFillNoDataCheckbox.checked;
    map.materialOptions.discardNoData = state;
    instance.notifyChange(map);
};