"use strict";

const { resolveAsset, placement } = require("./asset-package-resolver");

async function loadPackage(viewer, manifestUrl, assetId = "main") {
  const manifest = await fetch(manifestUrl).then((response) => {
    if (!response.ok) throw new Error(`Could not load manifest: ${response.status}`);
    return response.json();
  });
  const p = placement(manifest);
  const origin = Cesium.Cartesian3.fromDegrees(p.longitude, p.latitude, p.height);
  const enu = Cesium.Transforms.eastNorthUpToFixedFrame(origin);
  const rotation = Cesium.Matrix3.fromRotationZ(Cesium.Math.toRadians(p.headingCorrectionDegrees));
  const modelMatrix = Cesium.Matrix4.multiplyByMatrix3(enu, rotation, new Cesium.Matrix4());
  const model = await Cesium.Model.fromGltfAsync({ url: resolveAsset(manifestUrl, manifest, assetId), modelMatrix });
  viewer.scene.primitives.add(model);
  return { manifest, model, placement: p };
}

module.exports = { loadPackage };