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;
const now = Date.UTC(2026, 9, 10, 12);
const day = 86400_000;
beforeEach(async () => {
    vi.resetModules();
    fixture = await newFixture([]);
});
afterEach(async () => {
    vi.restoreAllMocks();
    await fixture.cleanup();
});

async function operation(
    id: string,
    options: {
        server?: string;
        action?: string;
        state?: string;
        start?: number | string;
        finish?: number | null;
        source?: string;
    } = {}
) {
    const { db } = await import('../../src/lib/server/db/index.js');
    const handle = db();
    const server = options.server ?? 't5_zombie_moon_1';
    const finish = options.finish === undefined ? now - 1000 : options.finish;
    const start = options.start ?? (finish ?? now) - 72_000;
    handle
        .prepare(
            `INSERT INTO server_deployments
        (id,server,server_deleted_at,action,state,stage,started_at,finished_at,triggered_by)
        VALUES(?,?,? ,?,?,'test',?,?,'test')`
        )
        .run(
            id,
            server,
            new Date(now).toISOString(),
            options.action ?? 'create',
            options.state ?? 'done',
            typeof start === 'string' ? start : new Date(start).toISOString(),
            finish === null ? null : new Date(finish).toISOString()
        );
    handle
        .prepare(
            `INSERT INTO provisioning_sources(operation_id,kind,source_id,server)
        VALUES(?,?, 'deleted-policy',?)`
        )
        .run(id, options.source ?? 'autoscaling', server);
    return handle;
}

it.each([1, 7, 30] as const)(
    'counts outcomes by finish time in the inclusive %i-day window',
    async (days) => {
        const { readMetrics } = await import('../../src/lib/server/fleet/metrics.js');
        const since = now - days * day;
        await operation('before', { finish: since - 1 });
        await operation('at-start', { finish: since, start: since - 60_000 });
        await operation('at-end', { finish: now, start: now - 120_000, state: 'warning' });
        await operation('after', { finish: now + 1 });
        await operation('removed', { action: 'destroy' });
        await operation('removed-warning', { action: 'destroy', state: 'warning' });
        await operation('failed-create', { state: 'failed' });
        await operation('failed-removal', { action: 'destroy', state: 'failed' });
        await operation('cancelled', { state: 'cancelled' });
        await operation('pending', { state: 'awaiting-health', finish: null });
        await operation('interrupted', { state: 'interrupted' });
        await operation('manual', { source: 'maintenance' });
        await operation('rebuild', { action: 'rebuild' });
        const result = readMetrics(days, now);
        expect(result.autoscaling).toEqual({
            added: 2,
            removed: 2,
            failed: 2,
            cancelled: 1,
            readinessSamples: 2,
            readinessMeanSeconds: 90,
            readinessMaxSeconds: 120
        });
        expect(result.summary.observed).toBe(0);
        expect(result.maps).toEqual([]);
        expect(result.scopeOptions.maps).toEqual([{ game: 't5', map: 'Moon' }]);
    }
);

it('weights readiness by completed creates and counts each operation once after policy/server deletion', async () => {
    const { readMetrics } = await import('../../src/lib/server/fleet/metrics.js');
    const handle = await operation('one', { start: now - 61_000 });
    await operation('two', { start: now - 121_000 });
    await operation('three', { server: 't6_zombie_town_1', start: now - 181_000 });
    // Several source rows and another consumer do not multiply the result.
    handle
        .prepare(
            `INSERT INTO provisioning_sources(operation_id,kind,source_id,server)
        VALUES('one','autoscaling','second-source','t5_zombie_moon_1'),
              ('one','maintenance','maintenance-source','t5_zombie_moon_1')`
        )
        .run();
    expect(handle.prepare('SELECT * FROM autoscaling_policies').all()).toEqual([]);
    expect(handle.prepare('SELECT * FROM autoscaling_decisions').all()).toEqual([]);
    expect(handle.prepare('SELECT * FROM servers').all()).toEqual([]);
    expect(readMetrics(7, now).autoscaling).toEqual({
        added: 3,
        removed: 0,
        failed: 0,
        cancelled: 0,
        readinessSamples: 3,
        readinessMeanSeconds: 120,
        readinessMaxSeconds: 180
    });
});

it('filters operation identity by game and map variant independently of the policy scope', async () => {
    const { readMetrics } = await import('../../src/lib/server/fleet/metrics.js');
    await operation('moon');
    await operation('town', { server: 't6_zombie_town_1', action: 'destroy' });
    await operation('farm', { server: 't6_zombie_farm_1', state: 'failed' });
    await operation('transit', { server: 't6_zombie_transit_1', state: 'cancelled' });
    await operation('older', { server: 't5_zombie_theater_1', finish: now - 8 * day });
    await operation('future', { server: 't6_zombie_tomb_1', finish: now + 1 });
    const report = (game: string, map = '') =>
        readMetrics(parseMetricsQuery(new URLSearchParams({ days: '7', game, map })), now);
    expect(report('t6').autoscaling).toMatchObject({
        added: 0,
        removed: 1,
        failed: 1,
        cancelled: 1
    });
    expect(report('t5', 'Moon').autoscaling.added).toBe(1);
    expect(report('t5', 'zombie_moon').autoscaling.added).toBe(1);
    for (const label of ['Town Survival', 'town']) {
        expect(report('t6', label).autoscaling).toMatchObject({
            added: 0,
            removed: 1,
            failed: 0,
            cancelled: 0
        });
    }
    for (const [game, map] of [
        ['t6', 'zm_transit'],
        ['t5', 'Town Survival'],
        ['t6', 'Unknown']
    ])
        expect(report(game, map).autoscaling).toMatchObject({
            added: 0,
            removed: 0,
            failed: 0,
            cancelled: 0
        });
    const options = report('t6').scopeOptions;
    expect(options.maps).toContainEqual({ game: 't5', map: 'Kino Der Toten' });
    expect(options.maps).not.toContainEqual({ game: 't6', map: 'Origins' });
    expect(report('t5', 'Kino Der Toten').autoscaling.added).toBe(0);
    expect(readMetrics(30, now).autoscaling.added).toBe(2);
});

it('keeps absent readiness null and excludes invalid durations without losing completed counts', async () => {
    const { readMetrics } = await import('../../src/lib/server/fleet/metrics.js');
    expect(readMetrics(7, now).autoscaling).toEqual({
        added: 0,
        removed: 0,
        failed: 0,
        cancelled: 0,
        readinessSamples: 0,
        readinessMeanSeconds: null,
        readinessMaxSeconds: null
    });
    await operation('negative', { start: now });
    await operation('invalid-start', { start: 'not-recorded' });
    await operation('missing-finish', { finish: null });
    expect(readMetrics(7, now).autoscaling).toMatchObject({
        added: 2,
        readinessSamples: 0,
        readinessMeanSeconds: null,
        readinessMaxSeconds: null
    });
    await operation('zero', { start: now, finish: now });
    expect(readMetrics(7, now).autoscaling).toMatchObject({
        added: 3,
        readinessSamples: 1,
        readinessMeanSeconds: 0,
        readinessMaxSeconds: 0
    });
});