import { test, beforeEach, afterEach } from 'node:test';
import assert from 'node:assert/strict';

import {
  DENOISE_MODELS,
  ML_DENOISE_REQUIREMENTS,
  isMLDenoiseSupported,
} from './lotusDenoiseUtils';

// ── Model catalog (data integrity) ──────────────────────────────────────────

test('DENOISE_MODELS lists the four expected models in order', () => {
  assert.deepEqual(
    DENOISE_MODELS.map((m) => m.id),
    ['rnnoise', 'speex', 'dtln', 'deepfilternet'],
  );
});

test('DENOISE_MODELS ids are unique', () => {
  const ids = DENOISE_MODELS.map((m) => m.id);
  assert.equal(new Set(ids).size, ids.length);
});

test('every model has non-empty display fields and valid rating enums', () => {
  const transients = new Set(['Poor', 'Good', 'Excellent']);
  const voice = new Set(['Moderate', 'High', 'Very High']);
  for (const m of DENOISE_MODELS) {
    for (const field of ['name', 'description', 'cpuUsage', 'binarySize'] as const) {
      assert.ok(typeof m[field] === 'string' && m[field].length > 0, `${m.id}.${field} empty`);
    }
    assert.ok(transients.has(m.transients), `${m.id} bad transients: ${m.transients}`);
    assert.ok(voice.has(m.voiceQuality), `${m.id} bad voiceQuality: ${m.voiceQuality}`);
  }
});

test('ML_DENOISE_REQUIREMENTS is a non-empty list of strings', () => {
  assert.ok(Array.isArray(ML_DENOISE_REQUIREMENTS) && ML_DENOISE_REQUIREMENTS.length > 0);
  assert.ok(ML_DENOISE_REQUIREMENTS.every((r) => typeof r === 'string' && r.length > 0));
});

// ── isMLDenoiseSupported (feature detection) ────────────────────────────────

const g = globalThis as Record<string, unknown>;
const NAMES = ['window', 'navigator', 'AudioWorkletNode'] as const;
let saved: Record<string, PropertyDescriptor | undefined>;

const setGlobal = (name: string, value: unknown): void => {
  Object.defineProperty(g, name, { value, configurable: true, writable: true });
};
const removeGlobal = (name: string): void => {
  // Make a bare reference to `name` throw ReferenceError (simulate an absent
  // global binding), as it would in a browser lacking the API entirely.
  if (Object.getOwnPropertyDescriptor(g, name)) delete g[name];
};

const withMediaDevices = { mediaDevices: { getUserMedia: () => Promise.resolve() } };

beforeEach(() => {
  saved = {};
  for (const n of NAMES) saved[n] = Object.getOwnPropertyDescriptor(g, n);
});
afterEach(() => {
  for (const n of NAMES) {
    const d = saved[n];
    if (d) Object.defineProperty(g, n, d);
    else if (Object.getOwnPropertyDescriptor(g, n)) delete g[n];
  }
});

test('returns false when there is no window (non-browser)', () => {
  setGlobal('window', undefined);
  assert.equal(isMLDenoiseSupported(), false);
});

test('returns true when AudioContext, AudioWorklet and getUserMedia are present', () => {
  setGlobal('window', { AudioContext: function AudioContext() {} });
  setGlobal('AudioWorkletNode', function AudioWorkletNode() {});
  setGlobal('navigator', withMediaDevices);
  assert.equal(isMLDenoiseSupported(), true);
});

test('accepts the legacy webkitAudioContext prefix', () => {
  setGlobal('window', { webkitAudioContext: function webkitAudioContext() {} });
  setGlobal('AudioWorkletNode', function AudioWorkletNode() {});
  setGlobal('navigator', withMediaDevices);
  assert.equal(isMLDenoiseSupported(), true);
});

test('returns false when getUserMedia is unavailable', () => {
  setGlobal('window', { AudioContext: function AudioContext() {} });
  setGlobal('AudioWorkletNode', function AudioWorkletNode() {});
  setGlobal('navigator', {}); // no mediaDevices
  assert.equal(isMLDenoiseSupported(), false);
});

test('returns false (does NOT throw) when the AudioWorkletNode binding is absent', () => {
  // Regression: a bare `!!AudioWorkletNode` threw ReferenceError on browsers
  // with AudioContext but no AudioWorkletNode; a detection helper must report
  // false, not throw.
  setGlobal('window', { AudioContext: function AudioContext() {} });
  setGlobal('navigator', withMediaDevices);
  removeGlobal('AudioWorkletNode');
  let result: boolean | undefined;
  assert.doesNotThrow(() => {
    result = isMLDenoiseSupported();
  });
  assert.equal(result, false);
});