// @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 { createDashboardRoutes } from '../../apps/dashboard/src/app/router.js';

interface TestStatsOverrides {
  isRunning?: boolean;
  recentActivity?: readonly unknown[];
}

const server = setupServer();

function createStats(overrides: TestStatsOverrides = {}) {
  return {
    isRunning: overrides.isRunning ?? false,
    dryRunMode: true,
    totalProcessed: 18,
    totalMessagesSent: 12,
    totalResponses: 3,
    responseRate: 25,
    messagesThisHour: 2,
    maxMessagesPerHour: 8,
    subreddits: [{ name: 'casualconversation', type: 'chat' }],
    targetGenders: ['female'],
    recentActivity: overrides.recentActivity ?? [],
    invitationCooldown: null,
  };
}

function installSuccessfulApi(overrides: TestStatsOverrides = {}) {
  server.use(
    http.get('/api/stats', () => HttpResponse.json(createStats(overrides))),
    http.get('/api/timers', () =>
      HttpResponse.json({
        nextMessageAvailableAt: null,
        hourlyResetAt: Date.now() + 3_600_000,
        isHourlyLimitReached: false,
        messagesRemaining: 6,
      }),
    ),
  );
}

function renderDashboard(initialPath = '/') {
  const queryClient = new QueryClient({
    defaultOptions: { queries: { retry: false }, mutations: { retry: false } },
  });
  const router = createMemoryRouter(createDashboardRoutes(), { initialEntries: [initialPath] });

  render(
    <QueryClientProvider client={queryClient}>
      <RouterProvider router={router} />
    </QueryClientProvider>,
  );

  return { queryClient, router };
}

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

describe('dashboard foundation', () => {
  it('provides responsive navigation with real routes for every platform area', async () => {
    installSuccessfulApi();
    const user = userEvent.setup();
    const { router } = renderDashboard('/');

    const navigation = screen.getByRole('navigation', { name: 'Primary navigation' });
    for (const label of ['Overview', 'Conversations', 'Media', 'Performance', 'Operations', 'Settings']) {
      expect(within(navigation).getByRole('link', { name: label })).toBeInTheDocument();
    }

    await user.click(screen.getByRole('button', { name: 'Open navigation' }));
    expect(screen.getByRole('button', { name: 'Close navigation' })).toHaveAttribute('aria-expanded', 'true');

    await user.click(within(navigation).getByRole('link', { name: 'Operations' }));
    await waitFor(() => expect(router.state.location.pathname).toBe('/operations'));
    expect(screen.getByRole('heading', { name: 'Operations' })).toBeInTheDocument();
  });

  it('shows loading then renders stats, timers, and an explicit empty activity state', async () => {
    let resolveStats: ((response: Response) => void) | undefined;
    server.use(
      http.get('/api/stats', async () =>
        new Promise<Response>((resolve) => {
          resolveStats = resolve;
        }),
      ),
      http.get('/api/timers', () =>
        HttpResponse.json({
          nextMessageAvailableAt: null,
          hourlyResetAt: Date.now() + 3_600_000,
          isHourlyLimitReached: false,
          messagesRemaining: 6,
        }),
      ),
    );

    renderDashboard();
    expect(screen.getByRole('status', { name: 'Loading overview' })).toBeInTheDocument();

    await waitFor(() => expect(resolveStats).toBeTypeOf('function'));
    resolveStats?.(HttpResponse.json(createStats()));

    expect(await screen.findByText('12', { selector: '[data-metric="messages-sent"]' })).toBeInTheDocument();
    expect(screen.getByText('6 messages remaining')).toBeInTheDocument();
    expect(screen.getByText('No recent activity yet.')).toBeInTheDocument();
    expect(screen.getByText('Dry run')).toBeInTheDocument();
  });

  it('keeps stats visible when timers fail and retries only the failed panel', async () => {
    let timerRequests = 0;
    server.use(
      http.get('/api/stats', () => HttpResponse.json(createStats())),
      http.get('/api/timers', () => {
        timerRequests += 1;
        if (timerRequests === 1) return HttpResponse.json({ error: 'Rate limiter not initialized' }, { status: 503 });
        return HttpResponse.json({
          nextMessageAvailableAt: null,
          hourlyResetAt: Date.now() + 3_600_000,
          isHourlyLimitReached: false,
          messagesRemaining: 6,
        });
      }),
    );
    const user = userEvent.setup();
    renderDashboard();

    expect(await screen.findByText('12', { selector: '[data-metric="messages-sent"]' })).toBeInTheDocument();
    const alert = await screen.findByRole('alert');
    expect(alert).toHaveTextContent('Rate limiter not initialized');

    await user.click(within(alert).getByRole('button', { name: 'Retry timers' }));
    expect(await screen.findByText('6 messages remaining')).toBeInTheDocument();
    expect(timerRequests).toBe(2);
  });

  it('shows refresh progress while preserving the current overview', async () => {
    installSuccessfulApi();
    const user = userEvent.setup();
    renderDashboard();

    const refreshButton = await screen.findByRole('button', { name: 'Refresh overview' });
    let resolveRefresh: ((response: Response) => void) | undefined;
    server.use(
      http.get('/api/stats', async () =>
        new Promise<Response>((resolve) => {
          resolveRefresh = resolve;
        }),
      ),
    );

    await user.click(refreshButton);
    expect(screen.getByRole('button', { name: 'Refreshing overview' })).toBeDisabled();
    expect(screen.getByText('12', { selector: '[data-metric="messages-sent"]' })).toBeInTheDocument();

    resolveRefresh?.(HttpResponse.json(createStats()));
    await waitFor(() => expect(screen.getByRole('button', { name: 'Refresh overview' })).toBeEnabled());
  });

  it('requires confirmation before starting and reflects the authoritative response', async () => {
    installSuccessfulApi();
    let startRequests = 0;
    server.use(
      http.post('/api/start', () => {
        startRequests += 1;
        return HttpResponse.json({ success: true, running: true });
      }),
    );
    const user = userEvent.setup();
    renderDashboard();

    await user.click(await screen.findByRole('button', { name: 'Start bot' }));
    const dialog = screen.getByRole('dialog', { name: 'Start bot?' });
    expect(dialog).toHaveTextContent('The bot will resume automated processing.');

    await user.click(within(dialog).getByRole('button', { name: 'Cancel' }));
    expect(startRequests).toBe(0);

    await user.click(screen.getByRole('button', { name: 'Start bot' }));
    await user.click(within(screen.getByRole('dialog')).getByRole('button', { name: 'Confirm start' }));

    expect(await screen.findByText('Running', { selector: '[data-bot-status]' })).toBeInTheDocument();
    expect(startRequests).toBe(1);
  });
});