import assert from 'node:assert/strict'
import { readFile } from 'node:fs/promises'
import { enuToGltf, instanceGltf } from '../../../src/modules/cockpit/services/pipeInstanceGltf.js'
import { Matrix4, Matrix3, Cartesian3 } from 'cesium'
// Independent literal: installed Cesium default correction maps glTF [x,y,z] -> ENU [z,x,y].
const correction = Matrix4.fromRotationTranslation(Matrix3.fromArray([0,1,0,0,0,1,1,0,0]))
const converted = new Cartesian3(...enuToGltf([11,23,37]))
assert.deepEqual(Matrix4.multiplyByPoint(correction, converted, new Cartesian3()), new Cartesian3(11,23,37))
const template = JSON.parse(await readFile(new URL('../../../public/cockpit/models/pipes/spline.gltf', import.meta.url)))
const doc = instanceGltf(template, [
    { translation: [0,0,0], rotation: [0,0,0,1], scale: [.4,.4,10] },
    { translation: [1,2,3], rotation: [0,0,0,1], scale: [.4,.4,20] },
])
assert.equal(doc.meshes.length, 1)
assert.equal(doc.meshes[0].primitives.length, 1)
assert.equal(doc.buffers[0].uri, template.buffers[0].uri, 'shared template geometry not copied per instance')
const attrs = doc.nodes[0].extensions.EXT_mesh_gpu_instancing.attributes
assert.equal(doc.accessors[attrs.TRANSLATION].count, 2)
assert.equal(doc.accessors[attrs.SCALE].count, 2)
assert.ok(doc.extensionsRequired.includes('EXT_mesh_gpu_instancing'))
assert.equal(template.nodes[0].extensions, undefined, 'shared template remains immutable')
const data = Buffer.from(doc.buffers[1].uri.split(',')[1], 'base64')
assert.equal(data.readFloatLE(12), 1)
assert.equal(data.readFloatLE(20), 3)
assert.equal(data.readFloatLE(80-4), 20)
console.log('PASS two GPU instances reuse one immutable mesh and preserve literal TRS')