import assert from "node:assert/strict";
import test from "node:test";
import { analyzeGlbJson } from "./glb-performance.mjs";

test("counts repeated mesh placements as avoidable draw calls", () => {
  const report = analyzeGlbJson({
    meshes: [
      { primitives: [{}, {}] },
      { primitives: [{}] },
    ],
    nodes: [
      { mesh: 0 },
      { mesh: 0 },
      { mesh: 0 },
      { mesh: 1 },
    ],
    materials: [
      { doubleSided: true, alphaMode: "BLEND" },
      {},
    ],
    textures: [{}, {}],
  });

  assert.equal(report.estimatedDrawCalls, 7);
  assert.equal(report.expandedPrimitiveInstances, 7);
  assert.equal(report.eligibleRepeatedMeshes, 1);
  assert.equal(report.eligibleRepeatedNodes, 3);
  assert.equal(report.unbatchedDrawCallSavings, 4);
  assert.equal(report.doubleSidedMaterials, 1);
  assert.equal(report.blendedMaterials, 1);
});

test("counts one draw-call set for an EXT_mesh_gpu_instancing batch", () => {
  const report = analyzeGlbJson({
    extensionsUsed: ["EXT_mesh_gpu_instancing"],
    accessors: [{ count: 12 }],
    meshes: [{ primitives: [{}, {}, {}] }],
    nodes: [{
      mesh: 0,
      extensions: {
        EXT_mesh_gpu_instancing: {
          attributes: { TRANSLATION: 0 },
        },
      },
    }],
  });

  assert.equal(report.estimatedDrawCalls, 3);
  assert.equal(report.expandedPrimitiveInstances, 36);
  assert.equal(report.gpuInstanceBatches, 1);
  assert.equal(report.gpuInstances, 12);
  assert.equal(report.unbatchedDrawCallSavings, 0);
  assert.equal(report.usesGpuInstancing, true);
});