import { afterEach, beforeEach, expect, it, vi } from 'vitest';
import { newFixture, type Fixture } from '../helpers/fixture.js';
import { parseMetricsQuery } from '../../src/lib/metrics.js';

let fixture: Fixture;
beforeEach(async () => {
    vi.resetModules();
    fixture = await newFixture([]);
});
afterEach(async () => {
    vi.restoreAllMocks();
    await fixture.cleanup();
});

it('runs reports off the request thread and invalidates cached history after writes', async () => {
    const { db } = await import('../../src/lib/server/db/index.js');
    const { recordMetrics, readMetrics } = await import('../../src/lib/server/fleet/metrics.js');
    const { metricsReport } = await import('../../src/lib/server/reports/index.js');
    const now = Date.UTC(2026, 9, 4, 12);
    vi.spyOn(Date, 'now').mockReturnValue(now);
    const sample = { server: 'one', game: 't5', map: 'Moon', players: 1, capacity: 4 };
    recordMetrics([sample], now - 30_000);
    const query = parseMetricsQuery(new URLSearchParams('days=1'));
    const first = metricsReport(query);
    const winner = await Promise.race([
        first.then(() => 'report'),
        new Promise<string>((resolve) => setTimeout(() => resolve('timer'), 0))
    ]);
    expect(winner).toBe('timer');
    expect(await first).toEqual(readMetrics(query, now));
    expect(await metricsReport(query)).toEqual(await first);
    db().prepare('UPDATE metric_samples SET players=3').run();
    const changed = await metricsReport(query);
    expect(changed).toEqual(readMetrics(query, now));
    expect(changed.summary.playerHours).toBeCloseTo((await first).summary.playerHours * 3);
});