// @vitest-environment jsdom

import '@testing-library/jest-dom/vitest';
import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
import { cleanup, render, screen, waitFor, within } from '@testing-library/react';
import userEvent from '@testing-library/user-event';
import { HttpResponse, http } from 'msw';
import { setupServer } from 'msw/node';
import { afterAll, afterEach, beforeAll, describe, expect, it, vi } from 'vitest';
import { createMemoryRouter, RouterProvider } from 'react-router-dom';
import { SettingsRoute } from '../../apps/dashboard/src/features/settings/settings-route.js';

const config = {
  rateLimit: { minDelayBetweenMessagesMs: 300_000, maxMessagesPerHour: 8, jitterMs: 60_000 },
  browser: { dryRun: true },
  reddit: { prioritizeRecentPosts: false, recentWindowMinutes: 60 },
  subreddits: [{ name: 'casualconversation', type: 'chat', weight: 2, tone: 'default' }],
  tones: ['default', 'dominant', 'submissive', 'playful', 'direct', 'gentle', 'kink-friendly', 'teasing'],
};

const server = setupServer();

function installConfigApi() {
  server.use(http.get('/api/config', () => HttpResponse.json(config)));
}

function renderSettings(path = '/settings') {
  const queryClient = new QueryClient({
    defaultOptions: { queries: { retry: false }, mutations: { retry: false } },
  });
  const router = createMemoryRouter(
    [{ path: '/settings', element: <SettingsRoute /> }],
    { initialEntries: [path] },
  );
  const view = render(
    <QueryClientProvider client={queryClient}>
      <RouterProvider router={router} />
    </QueryClientProvider>,
  );
  return { ...view, queryClient, router };
}

beforeAll(() => server.listen({ onUnhandledRequest: 'error' }));
afterEach(() => {
  cleanup();
  server.resetHandlers();
  vi.restoreAllMocks();
});
afterAll(() => server.close());

describe('settings and access', () => {
  it('loads the requested route-friendly section and keeps section selection in the URL', async () => {
    let resolveConfig: ((response: Response) => void) | undefined;
    server.use(
      http.get('/api/config', async ({ request }) => {
        expect(request.credentials).toBe('same-origin');
        return new Promise<Response>((resolve) => { resolveConfig = resolve; });
      }),
    );
    const user = userEvent.setup();
    const { router } = renderSettings('/settings?section=rate-limits');

    expect(screen.getByRole('status', { name: 'Loading settings' })).toBeInTheDocument();
    await waitFor(() => expect(resolveConfig).toBeTypeOf('function'));
    resolveConfig?.(HttpResponse.json(config));
    expect(await screen.findByRole('heading', { name: 'Rate limits' })).toBeInTheDocument();

    await user.click(screen.getByRole('button', { name: 'Monitoring' }));
    expect(screen.getByRole('heading', { name: 'Monitoring' })).toBeInTheDocument();
    expect(router.state.location.search).toBe('?section=monitoring');
  });

  it('shows a recoverable initial configuration error', async () => {
    let requests = 0;
    server.use(
      http.get('/api/config', () => {
        requests += 1;
        return requests === 1
          ? HttpResponse.json({ error: 'Configuration unavailable' }, { status: 503 })
          : HttpResponse.json(config);
      }),
    );
    const user = userEvent.setup();
    renderSettings();

    const alert = await screen.findByRole('alert');
    expect(alert).toHaveTextContent('Configuration unavailable');
    await user.click(within(alert).getByRole('button', { name: 'Retry settings' }));
    expect(await screen.findByRole('heading', { name: 'Monitoring' })).toBeInTheDocument();
  });

  it('validates fields, warns about unsaved changes, and resets to persisted values', async () => {
    installConfigApi();
    let updateRequests = 0;
    server.use(http.put('/api/config', () => {
      updateRequests += 1;
      return HttpResponse.json({ success: true, config, subreddits: config.subreddits });
    }));
    const user = userEvent.setup();
    renderSettings('/settings?section=monitoring');

    const recentWindow = await screen.findByRole('spinbutton', { name: 'Recent window in minutes' });
    await user.clear(recentWindow);
    await user.type(recentWindow, '0');
    expect(screen.getByRole('status')).toHaveTextContent('You have unsaved changes.');

    const beforeUnload = new Event('beforeunload', { cancelable: true });
    window.dispatchEvent(beforeUnload);
    expect(beforeUnload.defaultPrevented).toBe(true);

    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByText('Recent window must be greater than 0 minutes.')).toBeInTheDocument();
    expect(recentWindow).toHaveAttribute('aria-invalid', 'true');
    expect(updateRequests).toBe(0);

    await user.click(screen.getByRole('button', { name: 'Reset changes' }));
    expect(recentWindow).toHaveValue(60);
    expect(screen.queryByText('You have unsaved changes.')).not.toBeInTheDocument();
  });

  it('rejects blank numeric controls and invalid subreddit fields before transport', async () => {
    installConfigApi();
    let updateRequests = 0;
    server.use(http.put('/api/config', () => {
      updateRequests += 1;
      return HttpResponse.json({ success: true });
    }));
    const user = userEvent.setup();
    const { router } = renderSettings('/settings?section=rate-limits');

    const minimumDelay = await screen.findByRole('spinbutton', { name: 'Minimum delay in minutes' });
    await user.clear(minimumDelay);
    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByText('Minimum delay is required.')).toBeInTheDocument();
    expect(minimumDelay).toHaveAttribute('aria-invalid', 'true');

    await user.click(screen.getByRole('button', { name: 'Behaviour' }));
    expect(router.state.location.search).toBe('?section=behaviour');
    const subredditName = screen.getByRole('textbox', { name: 'Subreddit 1 name' });
    await user.clear(subredditName);
    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByText('Subreddit name is required.')).toBeInTheDocument();
    expect(subredditName).toHaveAttribute('aria-invalid', 'true');

    await user.type(subredditName, 'example');
    const weight = screen.getByRole('spinbutton', { name: 'Subreddit 1 weight' });
    await user.clear(weight);
    await user.type(weight, '-1');
    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByText('Subreddit weight must be greater than 0.')).toBeInTheDocument();
    expect(weight).toHaveAttribute('aria-invalid', 'true');
    expect(updateRequests).toBe(0);
  });

  it('saves validated settings with pending and authoritative success states', async () => {
    installConfigApi();
    let requestBody: unknown;
    let resolveUpdate: ((response: Response) => void) | undefined;
    server.use(
      http.put('/api/config', async ({ request }) => {
        expect(request.credentials).toBe('same-origin');
        requestBody = await request.json();
        return new Promise<Response>((resolve) => { resolveUpdate = resolve; });
      }),
    );
    const user = userEvent.setup();
    renderSettings('/settings?section=monitoring');

    const prioritize = await screen.findByRole('checkbox', { name: 'Prioritise recent posts' });
    await user.click(prioritize);
    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByRole('button', { name: 'Saving settings' })).toBeDisabled();

    await waitFor(() => expect(resolveUpdate).toBeTypeOf('function'));
    expect(requestBody).toMatchObject({ reddit: { prioritizeRecentPosts: true, recentWindowMinutes: 60 } });
    resolveUpdate?.(HttpResponse.json({
      success: true,
      config: {
        rateLimit: config.rateLimit,
        browser: config.browser,
        reddit: { ...config.reddit, prioritizeRecentPosts: true },
      },
      subreddits: config.subreddits,
    }));

    expect(await screen.findByText('Settings saved.')).toBeInTheDocument();
    expect(screen.queryByText('You have unsaved changes.')).not.toBeInTheDocument();

    await user.click(prioritize);
    expect(screen.getByText('You have unsaved changes.')).toBeInTheDocument();
    expect(screen.queryByText('Settings saved.')).not.toBeInTheDocument();
  });

  it('validates subreddit rows and confirms disabling dry run before saving behaviour', async () => {
    installConfigApi();
    let updateRequests = 0;
    server.use(
      http.put('/api/config', async ({ request }) => {
        updateRequests += 1;
        const body = await request.json() as { browser: { dryRun: boolean }; subreddits: typeof config.subreddits };
        return HttpResponse.json({
          success: true,
          config: { rateLimit: config.rateLimit, browser: body.browser, reddit: config.reddit },
          subreddits: body.subreddits,
        });
      }),
    );
    const user = userEvent.setup();
    renderSettings('/settings?section=behaviour');

    await user.click(await screen.findByRole('button', { name: 'Add subreddit' }));
    await user.type(screen.getByRole('textbox', { name: 'Subreddit 2 name' }), 'CasualConversation');
    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByText('Subreddit names must be unique.')).toBeInTheDocument();
    expect(updateRequests).toBe(0);

    const secondName = screen.getByRole('textbox', { name: 'Subreddit 2 name' });
    await user.clear(secondName);
    await user.type(secondName, 'askreddit');
    await user.click(screen.getByRole('checkbox', { name: 'Dry run mode' }));
    await user.click(screen.getByRole('button', { name: 'Save settings' }));

    const dialog = screen.getByRole('dialog', { name: 'Confirm risky settings' });
    expect(dialog).toHaveTextContent('Automated messages will be sent to Reddit');
    expect(updateRequests).toBe(0);
    await user.click(within(dialog).getByRole('button', { name: 'Apply risky settings' }));
    expect(await screen.findByText('Settings saved.')).toBeInTheDocument();
    expect(updateRequests).toBe(1);
  });

  it('confirms unusually large hourly limits', async () => {
    installConfigApi();
    let updateRequests = 0;
    server.use(http.put('/api/config', () => {
      updateRequests += 1;
      return HttpResponse.json({ success: true, config, subreddits: config.subreddits });
    }));
    const user = userEvent.setup();
    renderSettings('/settings?section=rate-limits');

    const hourlyLimit = await screen.findByRole('spinbutton', { name: 'Maximum messages per hour' });
    await user.clear(hourlyLimit);
    await user.type(hourlyLimit, '50');
    await user.click(screen.getByRole('button', { name: 'Save settings' }));
    expect(screen.getByRole('dialog', { name: 'Confirm risky settings' })).toHaveTextContent('50 messages per hour');
    expect(updateRequests).toBe(0);
  });

  it('shows Reddit session and noVNC state without exposing credentials, then starts and rechecks login', async () => {
    let statusRequests = 0;
    let loginRequests = 0;
    server.use(
      http.get('/api/config', () => HttpResponse.json(config)),
      http.get('/api/login/info', ({ request }) => {
        expect(request.credentials).toBe('same-origin');
        return HttpResponse.json({
          vncEnabled: true,
          novncPort: 6080,
          publicUrl: 'https://login.example/vnc.html',
          passwordRequired: true,
        });
      }),
      http.get('/api/login/status', () => {
        statusRequests += 1;
        return HttpResponse.json(statusRequests === 1
          ? { ready: true, loggedIn: false, status: 'login-required' }
          : { ready: true, loggedIn: true, status: 'authenticated' });
      }),
      http.post('/api/login/start', ({ request }) => {
        expect(request.credentials).toBe('same-origin');
        loginRequests += 1;
        return HttpResponse.json({ ok: true });
      }),
    );
    const user = userEvent.setup();
    renderSettings('/settings?section=access');

    expect(await screen.findByText('Login required')).toBeInTheDocument();
    expect(screen.getByRole('link', { name: 'Open noVNC login window' })).toHaveAttribute('href', 'https://login.example/vnc.html');
    expect(screen.getByText('A VNC password is required.')).toBeInTheDocument();
    expect(screen.queryByRole('textbox', { name: /password/i })).not.toBeInTheDocument();

    await user.click(screen.getByRole('button', { name: 'Open Reddit login' }));
    expect(await screen.findByText('Login page opened.')).toBeInTheDocument();
    expect(loginRequests).toBe(1);
    expect(await screen.findByText('Authenticated')).toBeInTheDocument();

    await user.click(screen.getByRole('button', { name: 'Recheck session' }));
    expect(statusRequests).toBeGreaterThanOrEqual(3);
  });
});