import assert from "node:assert/strict";
import { mkdtemp, rm } from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import sharp from "sharp";
import test from "node:test";
import { Document, NodeIO } from "@gltf-transform/core";
import { ALL_EXTENSIONS } from "@gltf-transform/extensions";
import { MeshoptDecoder } from "meshoptimizer";
import { auditGeometry } from "./audit-wow-visual-quality.mjs";

function addTriangle(document, buffer, { name, offset, material = null, textured = false, uvValues = null }) {
  const positions = document.createAccessor(`${name}-positions`)
    .setType("VEC3")
    .setArray(new Float32Array([
      offset, 0, 0,
      offset + 1, 0, 0,
      offset, 1, 0,
    ]))
    .setBuffer(buffer);
  const primitive = document.createPrimitive().setAttribute("POSITION", positions);
  if (textured) {
    const texcoords = document.createAccessor(`${name}-uvs`)
      .setType("VEC2")
      .setArray(new Float32Array(uvValues ?? [0, 0, 1, 0, 0, 1]))
      .setBuffer(buffer);
    primitive.setAttribute("TEXCOORD_0", texcoords);
  }
  if (material) primitive.setMaterial(material);
  const mesh = document.createMesh(`${name}-mesh`).addPrimitive(primitive);
  return document.createNode(name).setMesh(mesh);
}

test("WoW visual audit counts untextured and material-free surfaces safely", async (context) => {
  const workingDirectory = await mkdtemp(path.join(os.tmpdir(), "wow-visual-audit-"));
  context.after(async () => rm(workingDirectory, { recursive: true, force: true }));
  const visualFile = path.join(workingDirectory, "coverage-fixture.glb");
  const io = new NodeIO()
    .registerExtensions(ALL_EXTENSIONS)
    .registerDependencies({ "meshopt.decoder": MeshoptDecoder });
  const document = new Document();
  const buffer = document.createBuffer();
  const image = await sharp({
    create: { width: 1, height: 1, channels: 4, background: { r: 180, g: 140, b: 90, alpha: 1 } },
  }).png().toBuffer();
  const texture = document.createTexture("textured-surface").setMimeType("image/png").setImage(image);
  const texturedMaterial = document.createMaterial("textured").setBaseColorTexture(texture);
  const plainMaterial = document.createMaterial("plain").setBaseColorFactor([0.35, 0.31, 0.24, 1]);
  const scene = document.createScene("coverage-fixture")
    .addChild(addTriangle(document, buffer, { name: "textured", offset: 0, material: texturedMaterial, textured: true }))
    .addChild(addTriangle(document, buffer, { name: "plain", offset: 3, material: plainMaterial }))
    .addChild(addTriangle(document, buffer, { name: "no-material", offset: 6 }))
    .addChild(addTriangle(document, buffer, {
      name: "degenerate-uv",
      offset: 9,
      material: texturedMaterial,
      textured: true,
      uvValues: [0, 0, 0, 0, 1, 1],
    }));
  document.getRoot().setDefaultScene(scene);
  await io.write(visualFile, document);

  const result = await auditGeometry(visualFile, [[1, 1]], "coverage fixture");
  assert.equal(result.materialCoverage.totalTriangles, 4);
  assert.equal(result.materialCoverage.baseColorTexturedTriangles, 2);
  assert.equal(result.materialCoverage.untexturedTriangles, 2);
  assert.equal(result.materialCoverage.baseColorTexturedAreaM2, 1);
  assert.equal(result.materialCoverage.untexturedAreaM2, 1);
  assert.deepEqual(Object.keys(result.materialCoverage.untexturedMaterials).sort(), ["(no material)", "plain"]);
  assert.equal(result.materialCoverage.untexturedMaterials.plain.triangles, 1);
  assert.deepEqual(result.materialCoverage.untexturedMaterials.plain.baseColorFactor, [0.35, 0.31, 0.24, 1]);
  assert.equal(result.materialCoverage.untexturedMaterials["(no material)"].triangles, 1);

  const hotspotResult = await auditGeometry(visualFile, [[1, 1]], "coverage hotspot fixture", { hotspotCellSizeM: 2 });
  assert.equal(hotspotResult.uvHotspots.length, 1);
  assert.deepEqual(hotspotResult.uvHotspots[0].center, [9, 0.33, 1]);
  assert.equal(hotspotResult.uvHotspots[0].uvDegenerateTriangles, 1);
  assert.equal(hotspotResult.uvHotspots[0].rankCollapsedAreaM2, 0.5);
});