import { beforeEach, expect, it, vi } from 'vitest';
import { render } from 'svelte/server';
import type { MetricsData, MapMetrics, ServerMetrics } from '../../src/lib/metrics.js';
import MetricsPage from '../../src/routes/metrics/+page.svelte';
import MetricsSummary from '../../src/lib/ui/components/metrics/MetricsSummary.svelte';
import MetricsTables from '../../src/lib/ui/components/metrics/MetricsTables.svelte';
import MetricsExplore from '../../src/lib/ui/components/metrics/MetricsExplore.svelte';
import MetricsChart from '../../src/lib/ui/components/metrics/MetricsChart.svelte';
import { metricPage } from '../../src/lib/ui/metrics.js';
import { page } from '$app/state';

vi.mock('$app/state', () => ({ page: { url: new URL('http://localhost/metrics'), state: {} } }));
vi.mock('$app/navigation', () => ({ beforeNavigate: vi.fn(), afterNavigate: vi.fn(), goto: vi.fn(), replaceState: vi.fn() }));
const map = (i: number, changes: Partial<MapMetrics> = {}): MapMetrics => ({ game: 't5', map: `Map ${String(i).padStart(2, '0')}`, observed: 10, active: 5, idle: 5, unknown: 0, playerHours: i, full: 1, capacityObserved: 4, ...changes });
const server = (i: number): ServerMetrics => ({ server: `t5_zombie_theater_${i}`, currentRegistered: i !== 1, observed: 10, active: i / 10, idle: 10 - i / 10, unknown: 0, playerHours: i });
function report(): MetricsData {
    const now = Date.parse('2026-10-06T12:00:00Z');
    const summary = { observed: 10, active: 5, idle: 5, unknown: 2, playerHours: 20 };
    return { days: 7, since: now - 7 * 86400000, now, firstRetainedSampleAt: now - 14 * 86400000, latestSampleAt: now,
        registeredServerCount: 24, scope: { game: null, map: null, timeZone: 'America/New_York' }, scopeOptions: { games: ['t5'], maps: [] },
        scopeFirstSampleAt: now - 14 * 86400000, scopeLatestSampleAt: now, summary,
        maps: Array.from({ length: 24 }, (_, i) => map(i + 1)), servers: Array.from({ length: 24 }, (_, i) => server(i + 1)),
        points: [{ ...summary, at: now - 86400000, startAt: now - 86400000, endAt: now, partial: true }],
        previous: { since: now - 14 * 86400000, until: now - 7 * 86400000, summary: { ...summary, active: 4, idle: 6, playerHours: 10 }, firstSampleAt: now - 14 * 86400000, lastSampleAt: now - 7 * 86400000, partialHistory: true },
        pooledPressure: { value: 25, fullMapHours: 1, knownMapHours: 4, coveredMaps: 24, totalMaps: 24 }, heatmap: { timeZone: 'America/New_York', cells: [] }
    };
}
function scope(search: string, stateSearch?: string) {
    Object.assign(page, { url: new URL(`http://localhost/metrics${search}`), state: stateSearch ? { metricsTableSearch: stateSearch } : {} });
}
beforeEach(() => scope(''));

it('shows a summary and one paginated breakdown, preserving scope on range links', () => {
    scope('?game=t5&days=7&view=maps&mapPage=2');
    const body = render(MetricsPage, { props: { data: { ...report(), user: null, setupRequired: false } } }).body;
    expect(body).toContain('aria-label="Metrics breakdown"');
    expect(body).toContain('aria-label="Map metrics table"');
    expect(body).not.toContain('aria-label="Instance metrics table"');
    expect(body).toContain('16–24 of 24 maps');
    expect(body).toContain('game=t5&amp;days=30&amp;view=maps');
    expect(body).toContain('Partial previous history');
    expect(body).toContain('About this report');
    expect(body).not.toContain('Explore this period');
});

it('keeps percentage points, relative changes and unavailable capacity distinct', () => {
    const data = report();
    let body = render(MetricsSummary, { props: { report: data } }).body;
    expect(body).toContain('+10 pp'); expect(body).toContain('+100%');
    data.pooledPressure = { value: null, fullMapHours: 0, knownMapHours: 0, coveredMaps: 0, totalMaps: 24 };
    data.maps = [map(1, { capacityObserved: 0 })];
    data.previous.summary.playerHours = 0;
    body = render(MetricsSummary, { props: { report: data } }).body;
    expect(body).toContain('Capacity data unavailable');
    expect(body).toContain('New · no previous player-hours');
    expect(body).toContain('1 of 1 maps lack capacity data');
    expect(body).not.toContain('Infinity');
    data.summary.observed = 0;
    body = render(MetricsSummary, { props: { report: data } }).body;
    expect(body).toContain('Comparison unavailable');
});

it('searches and sorts the complete map set before pagination and clamps invalid pages', () => {
    const data = report();
    scope('?mapPage=2');
    let body = render(MetricsTables, { props: { maps: data.maps, servers: data.servers } }).body;
    expect(body).toContain('Map 09'); expect(body).not.toContain('Map 24');
    scope('?mapPage=2', '?mapQ=Map+24&mapPage=100&mapSort=playerHours');
    body = render(MetricsTables, { props: { maps: data.maps, servers: data.servers } }).body;
    expect(body).toContain('Map 24'); expect(body).toContain('1–1 of 1 maps');
    expect(body).not.toContain('>Next<');
    expect(metricPage(data.maps, '-1').page).toBe(1);
    expect(metricPage(data.maps, 'Infinity').page).toBe(1);
    expect(metricPage([], '20')).toMatchObject({ page: 1, start: 0, end: 0, total: 0 });
});

it('keeps missing capacity last when sorting and never presents it as zero full time', () => {
    scope('?mapSort=full&mapDirection=asc');
    const maps = [map(1, { capacityObserved: 0 }), map(2, { full: 0 }), map(3)];
    const body = render(MetricsTables, { props: { maps, servers: [] } }).body;
    expect(body.indexOf('Map 02')).toBeLessThan(body.indexOf('Map 03'));
    expect(body.indexOf('Map 03')).toBeLessThan(body.indexOf('Map 01'));
    expect(body).toContain('0.0%'); expect(body).toContain('Capacity data unavailable');
});

it('preserves instance return context and distinguishes historic names without current links', () => {
    scope('?view=instances&serverQ=theater&days=30');
    const body = render(MetricsTables, { props: { maps: [], servers: [server(1), server(2)], view: 'instances' } }).body;
    expect(body).toContain('Historical');
    expect(body).not.toContain('href="/servers/t5_zombie_theater_1');
    expect(body).toContain('href="/servers/t5_zombie_theater_2?returnTo=');
    expect(body).toContain('serverQ%3Dtheater');
    expect(body).not.toContain('>Idle</button>');
    expect(body).not.toContain('Open current server');
});

it('highlights at most three supported trials and collapses tentative findings', () => {
    const data = report(); data.maps.push(map(25, { observed: 0.1, active: 0.1, idle: 0, capacityObserved: 0 }));
    const body = render(MetricsExplore, { props: { report: data } }).body;
    const fold = body.indexOf('Other findings');
    expect(body.slice(0, fold).match(/class="recommendation /g)).toHaveLength(3);
    expect(body.indexOf('Map 25')).toBeGreaterThan(fold);
    expect(body).toContain('Limited evidence');
    expect(body).not.toMatch(/<details[^>]*open/);
    data.maps = [map(1, { capacityObserved: 0 })];
    expect(render(MetricsExplore, { props: { report: data } }).body).toContain('No hosting trials meet the evidence threshold');
});

it('keeps accessible chart selection, partial periods and gaps while collapsing inspection controls', () => {
    const data = report();
    data.points.push({ at: data.now, startAt: data.now, endAt: data.now + 1000, partial: false, observed: 0, active: 0, idle: 0, unknown: 0, playerHours: 0 });
    const body = render(MetricsChart, { props: { points: data.points, days: data.days, timeZone: data.scope.timeZone } }).body;
    expect(body).toContain('aria-label="Selected period summary"');
    expect(body).toContain('No captured time · not evidence of idle instances');
    expect(body).toContain('tabindex="0"');
    expect(body).toContain('Inspect a period');
    expect(body).toContain('Partial period');
    expect(body).not.toMatch(/<details[^>]*open/);
});

it('uses shallow URL state for the selected breakdown while retaining the common summary', () => {
    scope('?view=maps', '?view=instances&serverQ=theater&serverPage=2');
    let body = render(MetricsPage, { props: { data: { ...report(), user: null, setupRequired: false } } }).body;
    expect(body).toContain('aria-label="Instance metrics table"');
    expect(body).not.toContain('aria-label="Map metrics table"');
    expect(body).toContain('16–24 of 24 instances');
    scope('?view=maps', '?view=insights');
    body = render(MetricsPage, { props: { data: { ...report(), user: null, setupRequired: false } } }).body;
    expect(body).toContain('id="metrics-explore-title"');
    expect(body).toContain('Time all lobbies were full');
    expect(body).not.toContain('aria-label="Map metrics table"');
    expect(body).not.toContain('aria-label="Instance metrics table"');
});

it('filters other insights without hiding the highlighted supported trials', () => {
    scope('?view=insights&insightQ=Map+24&insightSort=map');
    const body = render(MetricsExplore, { props: { report: report() } }).body;
    expect(body).toContain('Map 01');
    expect(body).toContain('Map 24');
    expect(body).not.toContain('Map 23');
});