import { test } from 'node:test';
import assert from 'node:assert/strict';
import { nextSpeakerSet, sameSet } from './speakerSet';

test('sameSet: identity, size and membership', () => {
  const a = new Set(['@a:x', '@b:x']);
  assert.equal(sameSet(a, a), true);
  assert.equal(sameSet(a, new Set(['@b:x', '@a:x'])), true);
  assert.equal(sameSet(a, new Set(['@a:x'])), false);
  assert.equal(sameSet(a, new Set(['@a:x', '@c:x'])), false);
});

test('nextSpeakerSet returns the SAME reference when speakers are unchanged (#32)', () => {
  const prev = new Set(['@a:x']);
  const next = nextSpeakerSet(prev, [
    { userId: '@a:x', speaking: true },
    { userId: '@b:x', speaking: false },
  ]);
  assert.equal(next, prev);
});

test('nextSpeakerSet returns a new set when speakers change, ignoring non-user ids', () => {
  const prev = new Set(['@a:x']);
  const next = nextSpeakerSet(prev, [
    { userId: '@a:x', speaking: false },
    { userId: '@b:x', speaking: true },
    { userId: 'not-a-user-id', speaking: true },
  ]);
  assert.notEqual(next, prev);
  assert.deepEqual(Array.from(next), ['@b:x']);
});