import assert from "node:assert/strict";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import { pathToFileURL } from "node:url";
import test from "node:test";
import ts from "typescript";

const root = path.resolve(import.meta.dirname, "../../..");
const temporary = fs.mkdtempSync(path.join(os.tmpdir(), "obj-import-unit-"));
const sourcePath = path.join(root, "web/protocol/obj-import.ts");
const transpiled = ts.transpileModule(fs.readFileSync(sourcePath, "utf8"), {
  compilerOptions: { module: ts.ModuleKind.ES2022, target: ts.ScriptTarget.ES2022 },
  fileName: sourcePath,
  reportDiagnostics: true,
});
assert.deepEqual(transpiled.diagnostics, []);
const modulePath = path.join(temporary, "obj-import.mjs");
fs.writeFileSync(modulePath, transpiled.outputText);
const protocol = await import(pathToFileURL(modulePath));

const obj = new TextEncoder().encode(`# test\nmtllib materials.mtl\no Test\nv 0 0 0\nv 1 0 0\nv 0 1 0\nvt 0 0\nvt 1 0\nvt 0 1\nvn 0 0 1\ng TestGroup\nusemtl TestMaterial\nf -3/-3/-1 -2/-2/-1 -1/-1/-1\n`).buffer;
const mtl = new TextEncoder().encode("newmtl TestMaterial\nmap_Kd texture.png\n").buffer;

test("M12-07C resolves negative indices and serializes deterministic OBJ", () => {
  const imported = protocol.importOBJ(obj, mtl);
  assert.deepEqual(imported.faces[0].vertices.map((vertex) => vertex.position), [1, 2, 3]);
  assert.deepEqual(imported.faces[0].vertices.map((vertex) => vertex.texcoord), [1, 2, 3]);
  assert.deepEqual(imported.materials, [{ name: "TestMaterial", mapKd: "texture.png" }]);
  const serialized = protocol.serializeOBJ(imported);
  assert.match(serialized.obj, /f 1\/1\/1 2\/2\/1 3\/3\/1/);
  assert.equal(serialized.mtl, "# Web Blender MTL export\n# schema 1\nnewmtl TestMaterial\nmap_Kd texture.png\n");
});

test("M12-07C reports unresolved texture origin without blocking geometry", () => {
  const imported = protocol.importOBJ(obj, mtl);
  const missing = protocol.createOBJLossReport(imported);
  assert.equal(missing.canRoundTrip, true);
  assert.deepEqual(missing.warnings.map((warning) => warning.code), ["OBJ_TEXTURE_ORIGIN_UNRESOLVED"]);
  const bound = protocol.createOBJLossReport(imported, ["texture.png"]);
  assert.deepEqual(bound.warnings, []);
});

test("M12-07C rejects malformed face arity and out-of-range indices", () => {
  const malformed = new TextEncoder().encode("v 0 0 0\nv 1 0 0\nv 0 1 0\nf 1 2\n").buffer;
  assert.throws(() => protocol.importOBJ(malformed), /OBJ_FACE_ARITY_INVALID/);
  const outOfRange = new TextEncoder().encode("v 0 0 0\nv 1 0 0\nv 0 1 0\nf 1 2 4\n").buffer;
  assert.throws(() => protocol.importOBJ(outOfRange), /OBJ_INDEX_OUT_OF_RANGE/);
});

test.after(() => fs.rmSync(temporary, { recursive: true, force: true }));