import test from "node:test";
import assert from "node:assert/strict";
import fs from "node:fs";
import os from "node:os";
import path from "node:path";
import crypto from "node:crypto";
import { syncWebEngineRuntime } from "../../../tools/web/sync-web-engine-runtime.mjs";

function fixture(t) {
  const root = fs.mkdtempSync(path.join(os.tmpdir(), "webengine-sync-"));
  t.after(() => fs.rmSync(root, { recursive: true, force: true }));
  fs.mkdirSync(path.join(root, "build_web_blender6/bin"), { recursive: true });
  fs.mkdirSync(path.join(root, "web/app/public"), { recursive: true });
  const wasm = Buffer.from([0, 97, 115, 109, 1, 0, 0, 0]);
  fs.writeFileSync(path.join(root, "build_web_blender6/bin/web_engine.wasm"), wasm);
  fs.writeFileSync(path.join(root, "build_web_blender6/bin/web_engine.js"), "export default {};\n");
  const manifest = { modules: [{ resources: { single: { url: "/vendor/blender/web_engine.wasm", sha256: "old" }, pthread: { url: "/vendor/blender/pthread/web_engine.wasm", sha256: "other" } } }] };
  fs.writeFileSync(path.join(root, "web/app/public/wasm-module-manifest.json"), JSON.stringify(manifest));
  return { root, wasm };
}

test("compiled artifacts and their exact runtime binding are synchronized", (t) => {
  const { root, wasm } = fixture(t);
  const result = syncWebEngineRuntime(root);
  const manifest = JSON.parse(fs.readFileSync(path.join(root, "web/app/public/wasm-module-manifest.json")));
  assert.equal(manifest.modules[0].resources.single.sha256, crypto.createHash("sha256").update(wasm).digest("hex"));
  assert.equal(manifest.modules[0].resources.pthread.sha256, "other");
  assert.deepEqual(fs.readFileSync(path.join(root, "web/app/public/vendor/blender/web_engine.wasm")), wasm);
  assert.equal(result.changed.length, 5);
  assert.equal(syncWebEngineRuntime(root).changed.length, 0);
});

test("invalid builds never replace working runtime assets", (t) => {
  const { root } = fixture(t);
  syncWebEngineRuntime(root);
  const current = fs.readFileSync(path.join(root, "web/app/public/wasm-module-manifest.json"));
  fs.writeFileSync(path.join(root, "build_web_blender6/bin/web_engine.wasm"), "invalid");
  assert.throws(() => syncWebEngineRuntime(root), /invalid/);
  assert.deepEqual(fs.readFileSync(path.join(root, "web/app/public/wasm-module-manifest.json")), current);
});