import { test } from 'node:test';
import assert from 'node:assert/strict';
import { LOCAL_WRITE_GRACE_MS, pickHeartbeatStatus } from './ownStatusSync';

const now = 1_000_000;
const old = { lastLocalWriteAt: 0, now };

test('a status cleared on another device is not re-published (DP3)', () => {
  assert.equal(
    pickHeartbeatStatus({ ...old, local: 'stale', server: { presence: 'online', status_msg: '' } }),
    '',
  );
  assert.equal(pickHeartbeatStatus({ ...old, local: 'stale', server: { presence: 'online' } }), '');
});

test('a status set on another device is kept', () => {
  assert.equal(
    pickHeartbeatStatus({
      ...old,
      local: 'stale',
      server: { presence: 'unavailable', status_msg: 'new' },
    }),
    'new',
  );
});

test('falls back to the local copy when the read failed or we are invisible', () => {
  assert.equal(pickHeartbeatStatus({ ...old, local: 'mine', server: undefined }), 'mine');
  assert.equal(
    pickHeartbeatStatus({ ...old, local: 'mine', server: { presence: 'offline', status_msg: '' } }),
    'mine',
  );
});

test("a fresh local save wins over a server read that hasn't caught up", () => {
  const server = { presence: 'online', status_msg: 'previous' };
  assert.equal(
    pickHeartbeatStatus({ local: 'just saved', server, lastLocalWriteAt: now - 2000, now }),
    'just saved',
  );
  assert.equal(
    pickHeartbeatStatus({
      local: 'just saved',
      server,
      lastLocalWriteAt: now - LOCAL_WRITE_GRACE_MS - 1,
      now,
    }),
    'previous',
  );
});