import { beforeEach, afterEach, expect, it, vi } from 'vitest';
import { render } from 'svelte/server';
import { writable, type Writable } from 'svelte/store';
import { page } from '$app/stores';
import ActivityLog from '../../src/lib/ui/components/ActivityLog.svelte';
import {
    activityApiHref,
    activityHistoryHref,
    activityQuery,
    activityTimeLabel
} from '../../src/lib/ui/activity-history.js';
import type { ActivityPage as ActivityReport, ActivityRow } from '../../src/lib/activity.js';

vi.mock('$app/stores', () => ({
    page: writable({ url: new URL('http://localhost/servers/town?tab=history') })
}));
vi.mock('$app/navigation', () => ({ goto: vi.fn() }));
vi.mock('$ui/stores/fleet.js', () => ({
    fleet: writable({ servers: [], operations: [], receivedAt: 0 })
}));
vi.mock('$ui/stores/servers.js', () => ({ uiNow: writable(Date.parse('2026-10-07T18:00:00Z')) }));

const row: ActivityRow = {
    id: 'operation-1',
    at: '2026-10-07T17:59:45Z',
    type: 'restart',
    source: 'maintenance',
    sources: ['maintenance', 'campaign'],
    state: 'succeeded',
    rawState: 'done',
    title: 'Restart server',
    detail: 'Verified game readiness.',
    server: 't6_zombie_town_1',
    serverDeletedAt: null,
    hostId: 'host-a',
    hostName: 'Dallas 1',
    href: '/provisioning/operation-1'
};
const report = (): ActivityReport => ({
    rows: [{ ...row }],
    total: 52,
    limit: 25,
    offset: 0,
    query: { limit: 25, offset: 0 }
});
function scope(path = '/servers/town?tab=history') {
    (page as unknown as Writable<{ url: URL }>).set({ url: new URL(`http://localhost${path}`) });
}
beforeEach(() => {
    scope();
    vi.useFakeTimers();
    vi.setSystemTime(new Date('2026-10-07T18:00:00Z'));
});
afterEach(() => vi.useRealTimers());

it.each([
    ['', '0', 'All retained history'],
    ['0', '0', 'All retained history'],
    ['1', '1', 'Last 24 hours'],
    ['7', '7', 'Last 7 days'],
    ['30', '30', 'Last 30 days'],
    ['90', '90', 'Last 90 days'],
    ['14', '14', 'Last 14 days']
])('selects the current date range for days=%s on desktop and mobile', (days, value, label) => {
    scope(days ? `/servers/town?tab=history&days=${days}` : '/servers/town?tab=history');
    const body = render(ActivityLog, { props: { initial: report() } }).body;
    for (const suffix of ['', '-mobile']) {
        const select = body.match(
            new RegExp(`<select\\b[^>]*id="activity-days${suffix}"[^>]*>([\\s\\S]*?)</select>`)
        )?.[1];
        expect(select).toBeDefined();
        expect(select).toContain(`<option value="${value}" selected="">${label}</option>`);
        expect(select?.match(/\bselected=""/g)).toHaveLength(1);
    }
});

it('sends only supported normalized filters and enforces scoped identities', () => {
    const url = new URL(
        'https://example.test/servers/town?tab=history&server=wrong&source=host&state=failed&offset=50&returnTo=%2F'
    );
    const href = activityApiHref(url, { server: 't6_zombie_town_1', source: 'maintenance' });
    const params = new URL(href, url).searchParams;
    expect(params.get('server')).toBe('t6_zombie_town_1');
    expect(params.get('source')).toBe('maintenance');
    expect(params.get('state')).toBe('failed');
    expect(params.get('offset')).toBe('50');
    expect(params.get('limit')).toBe('25');
    expect(params.has('tab')).toBe(false);
    expect(params.has('returnTo')).toBe(false);
    expect(
        activityQuery(new URL('https://example.test/servers/town?tab=history&type=unknown&days=0'))
            .type
    ).toBeUndefined();
});

it('resets pagination when filtering and preserves the containing page, hash, and return context', () => {
    const current = new URL(
        'https://example.test/servers/town?tab=history&offset=50&source=campaign&returnTo=%2F%3Ffilter%3Dattention#history'
    );
    const filtered = new URL(
        activityHistoryHref(current, { state: 'failed', q: 'Dallas lobby' }),
        current
    );
    expect(filtered.searchParams.get('offset')).toBeNull();
    expect(filtered.searchParams.get('tab')).toBe('history');
    expect(filtered.searchParams.get('source')).toBe('campaign');
    expect(filtered.searchParams.get('returnTo')).toBe('/?filter=attention');
    expect(filtered.hash).toBe('#history');
    expect(filtered.searchParams.get('q')).toBe('Dallas lobby');
    expect(
        new URL(activityHistoryHref(filtered, { offset: '25' }), current).searchParams.get('state')
    ).toBe('failed');
});

it('keeps provisioning excluded from log polling after filtering or clearing filters', () => {
    const url = new URL(
        'http://localhost/servers/town?tab=history&type=create&excludeProvisioning=false'
    );
    const scope = { excludeProvisioning: true };
    expect(new URL(activityApiHref(url, scope), url).searchParams.get('excludeProvisioning')).toBe(
        'true'
    );
    const cleared = new URL(activityHistoryHref(url, { type: '', source: '', offset: '' }), url);
    expect(activityQuery(cleared, scope).excludeProvisioning).toBe(true);
    expect(
        activityQuery(new URL('http://localhost/servers/town?tab=history')).excludeProvisioning
    ).toBeUndefined();
});

it('keeps maintenance excluded from log polling while preserving the Maintenance history scope', () => {
    const url = new URL(
        'http://localhost/servers/town?tab=history&source=maintenance&excludeMaintenance=false'
    );
    const logScope = { excludeProvisioning: true, excludeMaintenance: true };
    expect(
        new URL(activityApiHref(url, logScope), url).searchParams.get('excludeMaintenance')
    ).toBe('true');
    const cleared = new URL(activityHistoryHref(url, { type: '', source: '', offset: '' }), url);
    expect(activityQuery(cleared, logScope).excludeMaintenance).toBe(true);
    const maintenance = new URL('http://localhost/maintenance?view=activity');
    const query = new URL(
        activityApiHref(maintenance, { source: 'maintenance', excludeMaintenance: false }),
        maintenance
    ).searchParams;
    expect(query.get('source')).toBe('maintenance');
    expect(query.has('excludeMaintenance')).toBe(false);
});

it('shows relative recent timestamps and preserves accurate older dates and invalid evidence', () => {
    const now = Date.parse('2026-10-07T18:00:00Z');
    expect(activityTimeLabel('2026-10-07 17:59:45', 'America/New_York', now)).toBe('15 s ago');
    expect(activityTimeLabel('2026-10-07T17:50:00Z', 'America/New_York', now)).toBe('10 min ago');
    expect(activityTimeLabel('2026-10-07T16:00:00Z', 'America/New_York', now)).toBe('2 h ago');
    expect(activityTimeLabel('2026-10-06T17:00:00Z', 'America/New_York', now)).toBe(
        'Yesterday, 1:00 PM'
    );
    expect(activityTimeLabel('not a date', 'UTC', now)).toBe('Time unavailable');
    expect(activityTimeLabel('2026-10-08T18:00:00Z', 'America/New_York', now)).toBe(
        'Oct 8, 2026, 2:00 PM EDT'
    );
});

it('renders named operation links, shared source memberships, friendly resources, and one freshness indicator', () => {
    scope('/servers/town?tab=history&state=succeeded&offset=25');
    const data = report();
    data.offset = 25;
    const body = render(ActivityLog, { props: { initial: data } }).body;
    expect(body).toContain('Town Survival');
    expect(body).toContain('Dallas 1');
    expect(body).toContain('Restart server · Town Survival · Lobby 1');
    expect(body).toContain('Maintenance &amp; recovery · Campaigns');
    expect(body).toContain('Completed');
    expect(body).toContain('shape-circle');
    expect(body).toContain('15 s ago');
    expect(body).toContain('datetime="2026-10-07T17:59:45Z"');
    expect(body).toContain('returnTo=%2Fservers%2Ftown%3Ftab%3Dhistory');
    expect(body).toContain('state%3Dsucceeded');
    expect(body).toContain('offset%3D25');
    expect(body).toContain('26–26 of 52');
    expect(body).toContain('offset=50');
    expect(body.match(/Updates every 10 seconds/g)).toHaveLength(1);
    expect(body).not.toContain('aria-live');
});

it('preserves deleted server evidence without linking to a replacement instance', () => {
    scope('/maintenance?view=activity');
    const data = report();
    data.rows = [{ ...row, serverDeletedAt: '2026-10-07T17:59:46Z' }];
    const body = render(ActivityLog, { props: { initial: data } }).body;
    expect(body).toContain('Town Survival');
    expect(body).toContain('Deleted');
    expect(body).not.toContain('href="/servers/');
    expect(body).toContain('/provisioning/operation-1?returnTo=');
});

it('offers one mobile filter sheet with distinct IDs and hides fixed scope controls', () => {
    const body = render(ActivityLog, { props: { initial: report() } }).body;
    expect(body).toContain('Activity filters');
    expect(body).toContain('id="activity-host-mobile"');
    expect(body).toContain('id="activity-search-mobile"');
    const ids = [...body.matchAll(/\bid="([^"]+)"/g)].map((match) => match[1]);
    expect(new Set(ids).size).toBe(ids.length);
    scope('/maintenance?view=activity&state=failed');
    const fixed = render(ActivityLog, {
        props: { initial: report(), server: row.server!, source: 'maintenance' }
    }).body;
    expect(fixed).not.toContain('id="activity-server');
    expect(fixed).not.toContain('id="activity-source');
    expect(fixed).toContain('<option value="update"');
    expect(fixed).toContain('<option value="health"');
    expect(fixed).toContain('view=activity');
    expect(fixed).toContain('state=failed');
    expect(fixed).toContain('Filters · 1');
});

it('offers useful empty and out-of-range page recovery', () => {
    scope('/servers/town?tab=history&q=missing&offset=100');
    const data = report();
    data.rows = [];
    data.offset = 100;
    const body = render(ActivityLog, { props: { initial: data } }).body;
    expect(body).toContain('No matching activity');
    expect(body).toContain('Clear filters');
    expect(body).toContain('No activities on this page');
    expect(body).toContain('offset=75');
    expect(body).toContain('Previous');
});