const test = require("node:test");
const assert = require("node:assert/strict");
const fs = require("node:fs");
const vm = require("node:vm");
const path = require("node:path");

test("AudioWorklet emits independent 100ms little-endian PCM16 packets", () => {
  const packets = [];
  let Processor;
  vm.runInNewContext(
    fs.readFileSync(
      path.join(__dirname, "../services/asr-web/web/pcm-worklet.js"),
      "utf8",
    ),
    {
      AudioWorkletProcessor: class {
        constructor() {
          this.port = { postMessage: (buffer) => packets.push(buffer) };
        }
      },
      registerProcessor: (_name, implementation) => {
        Processor = implementation;
      },
    },
  );
  const processor = new Processor();
  assert.equal(processor.process([]), true);
  const samples = new Float32Array(3200);
  samples[0] = -1;
  samples[1] = 1;
  samples[2] = 0.5;
  processor.process([[samples]]);
  assert.equal(packets.length, 2);
  assert.notEqual(packets[0], packets[1]);
  assert.equal(packets[0].byteLength, 3200);
  const view = new DataView(packets[0]);
  assert.equal(view.getInt16(0, true), -32768);
  assert.equal(view.getInt16(2, true), 32767);
  assert.equal(view.getInt16(4, true), 16383);
});