import { expect, it, vi } from 'vitest';
import { render } from 'svelte/server';
import { writable } from 'svelte/store';
import type { CapacityData, CapacityHost, CapacityHistory } from '../../src/lib/capacity.js';
import CapacityPage from '../../src/routes/capacity/+page.svelte';
import CapacityHosts from '../../src/lib/ui/components/capacity/CapacityHosts.svelte';
import CapacityChart from '../../src/lib/ui/components/capacity/CapacityChart.svelte';

vi.mock('$app/state', () => ({
    page: { url: new URL('http://localhost/capacity?host=ec-1&game=t5') }
}));
vi.mock('$app/stores', () => ({ page: writable({ url: new URL('http://localhost/capacity') }) }));
vi.mock('$app/navigation', () => ({
    beforeNavigate: vi.fn(),
    afterNavigate: vi.fn(),
    goto: vi.fn()
}));

const allowance = {
    cpuCores: 0.5,
    memoryBytes: 1024 ** 3,
    source: 'host' as const,
    samples: 20,
    observedAt: '2026-10-06T12:00:00Z'
};
const host = (changes: Partial<CapacityHost> = {}): CapacityHost => ({
    id: 'ec-1',
    name: 'ec-1',
    connected: true,
    readiness: 'ready',
    updatedAt: '2026-10-06T12:00:00Z',
    eligible: true,
    games: ['t5', 't6'],
    reasons: [],
    cpuCoresAvailable: 2,
    memoryBytesAvailable: 4 * 1024 ** 3,
    portsAvailable: 1,
    totalPorts: 10,
    estimatedServers: 1,
    limits: { cpu: 4, memory: 4, ports: 1 },
    limitingResource: 'Ports',
    calibration: { running: allowance, startup: allowance },
    ...changes
});
const history: CapacityHistory = {
    temperatures: [],
    range: '24h',
    startAt: 1000,
    endAt: 5000,
    bucketMs: 1000,
    points: [
        {
            at: 1000,
            cpuCoresAvailable: 2,
            memoryBytesAvailable: 1024 ** 3,
            reportingHosts: 1,
            expectedHosts: 1
        },
        {
            at: 2000,
            cpuCoresAvailable: null,
            memoryBytesAvailable: null,
            reportingHosts: 0,
            expectedHosts: 1
        },
        {
            at: 3000,
            cpuCoresAvailable: 3,
            memoryBytesAvailable: 2 * 1024 ** 3,
            reportingHosts: 1,
            expectedHosts: 1
        }
    ]
};
const data = (): CapacityData => ({
    query: { range: '24h', game: 't5', hostId: 'ec-1' },
    history,
    current: {
        updatedAt: '2026-10-06T12:00:00Z',
        hosts: [host()],
        hostOptions: [{ id: 'ec-1', name: 'ec-1' }],
        warnings: [],
        summary: {
            estimatedServers: 1,
            cpuCoresAvailable: 2,
            memoryBytesAvailable: 4 * 1024 ** 3,
            portsAvailable: 1,
            eligibleHosts: 1,
            totalHosts: 1,
            startupSlots: 3,
            startupLimit: 3,
            activeStartups: 0,
            queued: 0
        }
    }
});

it('keeps current estimates and host comparison before history with scoped history controls', () => {
    const body = render(CapacityPage, { props: { data: data() } }).body;
    expect(body.indexOf('id="capacity-now-title"')).toBeLessThan(
        body.indexOf('id="host-capacity-title"')
    );
    expect(body.indexOf('id="host-capacity-title"')).toBeLessThan(
        body.indexOf('id="capacity-history-title"')
    );
    expect(body.indexOf('aria-label="History range"')).toBeGreaterThan(
        body.indexOf('id="capacity-history-title"')
    );
    expect(body).toContain('range=7d&amp;game=t5&amp;host=ec-1');
    expect(body).toContain('3 of 3 available');
    expect(body).toContain('No queued servers');
    expect(body).not.toContain('href="/provisioning"');
    expect(body).not.toContain('Manage hosts');
    expect(body).toContain('Updates every 30 seconds');
    expect(body).not.toContain('>Refresh<');
    expect(body.indexOf('id="temperature-history-title"')).toBeGreaterThan(
        body.indexOf('id="capacity-history-title"')
    );
    expect(body.match(/aria-label="History range"/g)).toHaveLength(2);
});

it('keeps fleet-wide queue scope explicit and preserves unavailable estimates', () => {
    const report = data();
    report.current.summary.queued = 2;
    report.current.summary.estimatedServers = null;
    const body = render(CapacityPage, { props: { data: report } }).body;
    expect(body).toContain('Capacity estimate unavailable');
    expect(body).toContain('href="/provisioning"');
    expect(body.replace(/\s+/g, ' ')).toContain('2 servers queued');
    expect(body).toContain('Fleet-wide');
});

it('keeps ineligible hosts and their reasons visible while collapsing detailed assumptions', () => {
    const body = render(CapacityHosts, {
        props: {
            returnTo: '/capacity',
            hosts: [
                host(),
                host({
                    id: 'missing-files',
                    name: 'Missing files',
                    eligible: false,
                    estimatedServers: 0,
                    limitingResource: null,
                    reasons: ['Latest game files are not ready.']
                }),
                host({
                    id: 'offline',
                    name: 'Offline host',
                    connected: false,
                    eligible: false,
                    estimatedServers: 0,
                    cpuCoresAvailable: null,
                    memoryBytesAvailable: null,
                    limitingResource: null,
                    reasons: ['Waiting for a fresh host report.']
                })
            ]
        }
    }).body;
    expect(body).toContain('Additional servers</th>');
    expect(body).toContain('Not eligible');
    expect(body).toContain('Latest game files are not ready.');
    expect(body).toContain('Offline');
    expect(body).toContain('>—</td>');
    expect(body).not.toContain('>Ready<');
    expect(body).toMatch(/<tr hidden[^>]*id="capacity-host-ec-1"/);
    expect(body).toContain('aria-expanded="false"');
    expect(body).toContain('Running server');
    expect(body).toContain('aria-label="Host capacity comparison" tabindex="0"');
});

it('preserves chart gaps, keyboard inspection and reporting coverage in the compact chart', () => {
    const body = render(CapacityChart, { props: { history, scope: 'All hosts' } }).body;
    expect(body.match(/class="trend /g)).toHaveLength(2);
    expect(body).toContain('role="slider"');
    expect(body).toContain('1 of 1 hosts reporting');
    expect(body).toContain('Reporting hosts');
    expect(body).toContain('The game filter applies to current launch estimates only.');
    expect(body).toContain('About this chart');
    expect(body).not.toMatch(/<details[^>]*open/);
    const empty = render(CapacityChart, {
        props: { history: { ...history, points: [history.points[1]] }, scope: 'All hosts' }
    }).body;
    expect(empty).toContain('Waiting for capacity history');
    expect(empty).toContain('No complete report');
});