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 cached match metrics after active matches and recorded participants change without new samples', async () => {
    const { db } = await import('../../src/lib/server/db/index.js');
    const { 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 at = new Date(now - 30_000).toISOString();
    const query = parseMetricsQuery(new URLSearchParams('days=1'));
    const report = async () => {
        const result = await metricsReport(query);
        expect(result).toEqual(readMetrics(query, now));
        return result;
    };
    expect((await report()).matches.started).toBe(0);
    const match = db().prepare(`INSERT INTO leaderboard_matches
        (id, server, game, map, map_key, map_name, started_at, last_received_at,
            status, last_event, last_fingerprint)
        VALUES (?, 'removed-server', 't5', 'zombie_moon', 't5:moon', 'Moon', ?, ?, 'active', 'game_start', 'test')`);
    match.run(1, at, at);
    expect((await report()).matches).toEqual({
        started: 1,
        withRecordedPlayers: 0,
        averageGroupSize: null,
        solo: 0,
        soloShare: null
    });
    const player = db().prepare(`INSERT INTO leaderboard_match_players
        (match_id, guid, first_seen_at, last_seen_at) VALUES (1, ?, ?, ?)`);
    player.run('one', at, at);
    expect((await report()).matches).toMatchObject({ averageGroupSize: 1, soloShare: 100 });
    player.run('two', at, at);
    expect((await report()).matches).toMatchObject({ averageGroupSize: 2, soloShare: 0 });
    match.run(2, at, at);
    expect((await report()).matches).toMatchObject({ started: 2, withRecordedPlayers: 1 });
    db().prepare("UPDATE leaderboard_match_players SET match_id=2 WHERE guid='two'").run();
    expect((await report()).matches).toMatchObject({
        withRecordedPlayers: 2,
        averageGroupSize: 1,
        solo: 2,
        soloShare: 100
    });
    db().prepare("DELETE FROM leaderboard_match_players WHERE guid='one'").run();
    expect((await report()).matches).toMatchObject({ withRecordedPlayers: 1, solo: 1 });
    db().prepare('DELETE FROM leaderboard_matches WHERE id=2').run();
    expect((await report()).matches).toMatchObject({
        started: 1,
        withRecordedPlayers: 0,
        averageGroupSize: null
    });
    db().prepare("UPDATE leaderboard_matches SET map_name='Town Survival', game='t6'").run();
    expect((await report()).maps.map((map) => [map.game, map.map])).toEqual([
        ['t6', 'Town Survival']
    ]);
    db()
        .prepare('UPDATE leaderboard_matches SET started_at=?')
        .run(new Date(now - 2 * 86400_000).toISOString());
    const outsideWindow = await report();
    expect(outsideWindow.matches.started).toBe(0);
    expect(outsideWindow.maps).toEqual([]);
    expect(outsideWindow.scopeOptions.maps).toEqual([{ game: 't6', map: 'Town Survival' }]);
    db().prepare('DELETE FROM leaderboard_matches').run();
    expect((await report()).scopeOptions).toEqual({ games: [], maps: [] });
});

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();
});

it('refreshes autoscaling outcomes after completion, source changes and retention without new samples', async () => {
    const { db } = await import('../../src/lib/server/db/index.js');
    const { metricsReport } = await import('../../src/lib/server/reports/index.js');
    const now = Date.UTC(2026, 9, 10, 12);
    vi.spyOn(Date, 'now').mockReturnValue(now);
    const query = parseMetricsQuery(new URLSearchParams('days=7'));
    const report = () => metricsReport(query);
    expect((await report()).autoscaling.added).toBe(0);
    db()
        .prepare(
            `INSERT INTO server_deployments
        (id,server,action,state,stage,started_at,triggered_by)
        VALUES('operation','t5_zombie_moon_1','create','awaiting-health','Waiting',?,'test')`
        )
        .run(new Date(now - 72_000).toISOString());
    db().exec(`INSERT INTO provisioning_sources(operation_id,kind,source_id,server)
        VALUES('operation','autoscaling','deleted-policy','t5_zombie_moon_1')`);
    expect((await report()).autoscaling.added).toBe(0);
    db()
        .prepare("UPDATE server_deployments SET state='done',finished_at=? WHERE id='operation'")
        .run(new Date(now).toISOString());
    expect((await report()).autoscaling).toMatchObject({
        added: 1,
        readinessSamples: 1,
        readinessMeanSeconds: 72,
        readinessMaxSeconds: 72
    });
    db().exec("UPDATE provisioning_sources SET kind='maintenance'");
    expect((await report()).autoscaling.added).toBe(0);
    db().exec("UPDATE provisioning_sources SET kind='autoscaling'");
    expect((await report()).autoscaling.added).toBe(1);
    db().exec("UPDATE server_deployments SET state='failed'");
    expect((await report()).autoscaling).toMatchObject({
        added: 0,
        failed: 1,
        readinessSamples: 0
    });
    db().exec('DELETE FROM server_deployments');
    expect((await report()).autoscaling.failed).toBe(0);
    expect((await report()).scopeOptions.maps).toEqual([]);
});