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);
});

it('refreshes policy signals after policy edits and global pauses without new samples', async () => {
    const { db } = await import('../../src/lib/server/db/index.js');
    const { recordMetrics } = 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);
    recordMetrics(
        [{ server: 'one', game: 't5', map: 'Moon', players: 1, capacity: null }],
        now - 60_000
    );
    const query = parseMetricsQuery(new URLSearchParams('days=1'));
    expect((await metricsReport(query)).maps[0].policy).toBeNull();
    const settings = {
        game: 't5',
        mapSlug: '*',
        mode: 'create-destroy',
        minimum: 1,
        maximum: 1,
        spares: 1,
        emptyMinutes: 15
    };
    db()
        .prepare(
            `INSERT INTO autoscaling_policies
        (id,game,map_slug,settings,mode,owns_map,updated_at) VALUES(?,?,?,?,?,1,?)`
        )
        .run(
            'moon-policy',
            't5',
            '*',
            JSON.stringify(settings),
            settings.mode,
            new Date(now).toISOString()
        );
    const atMaximum = (await metricsReport(query)).maps[0];
    expect(atMaximum.policy?.maximum).toBe(1);
    expect(atMaximum.noEmptyAtMaximum).toBeCloseTo(1 / 60);
    db()
        .prepare('UPDATE autoscaling_policies SET settings=? WHERE id=?')
        .run(JSON.stringify({ ...settings, maximum: 3 }), 'moon-policy');
    const belowMaximum = (await metricsReport(query)).maps[0];
    expect(belowMaximum.policy?.maximum).toBe(3);
    expect(belowMaximum.noEmptyAtMaximum).toBe(0);
    expect(belowMaximum.noEmptyBelowMaximum).toBeCloseTo(1 / 60);
    db()
        .prepare(
            "INSERT INTO settings(key,value) VALUES('autoscaling_paused','1') ON CONFLICT(key) DO UPDATE SET value='1'"
        )
        .run();
    const globallyPaused = await metricsReport(query);
    expect(globallyPaused.autoscalingPaused).toBe(true);
    expect(globallyPaused.maps[0]).toEqual(belowMaximum);
    db().prepare("UPDATE settings SET value='0' WHERE key='autoscaling_paused'").run();
    const resumed = await metricsReport(query);
    expect(resumed.autoscalingPaused).toBe(false);
    expect(resumed.maps).toEqual(globallyPaused.maps);
    db().prepare("DELETE FROM autoscaling_policies WHERE id='moon-policy'").run();
    expect((await metricsReport(query)).maps[0].policy).toBeNull();
});