import { test } from 'node:test';
import assert from 'node:assert/strict';
import type { AnalyticsStore } from '../src/server/analytics-store.js';
import { Analytics } from '../src/server/analytics.js';
import { ManualClock } from './helpers.js';

test('ten-second observations preserve a brief peak in one five-minute write and flush the final partial interval', async () => {
  const clock = new ManualClock();
  const writes: Parameters<AnalyticsStore['sample']>[] = [];
  const store = {
    sample: async (...args: Parameters<AnalyticsStore['sample']>) => { writes.push(args); },
    cleanup: async () => {},
  } as unknown as AnalyticsStore;
  const analytics = new Analytics(store, clock);
  try {
    analytics.states.set('visitor', { visible: true, lastAt: clock.now(), metadata: { device: 'pc', browser: 'Other', source: 'direct_or_unknown', invitation: false } });
    await clock.advance(290000);
    assert.equal(writes.length, 0);
    assert.equal(analytics.live().active, 0);
    await clock.advance(10000);
    assert.equal(writes.length, 1);
    assert.equal(writes[0][1].active, 1);
    assert.equal(writes[0][4], 30);
    await clock.advance(300000);
    assert.equal(writes.length, 2);
    assert.equal(writes[1][1].active, 0);
    assert.equal(writes[1][4], 30);
    await clock.advance(20000);
    assert.equal(writes.length, 2);
    await analytics.close();
    assert.equal(writes.length, 3);
    assert.equal(writes[2][4], 2);
    await analytics.close();
    assert.equal(writes.length, 3);
  } finally { await analytics.close(); }
});