import { fireEvent, render, screen, waitFor } from '@testing-library/react';
import { beforeEach, describe, expect, it, vi } from 'vitest';

vi.mock('./api/sessionApi', () => ({
  getSessionMe: vi.fn(),
  loginSession: vi.fn(),
  refreshSession: vi.fn(),
  logoutSession: vi.fn()
}));

vi.mock('./api/dashboardApi', () => ({
  loadDashboard: vi.fn(),
  loadRecentChanges: vi.fn(),
  setServiceWindow: vi.fn()
}));

import { loadDashboard, loadRecentChanges, setServiceWindow } from './api/dashboardApi';
import { ApiError } from './api/client';
import { getSessionMe } from './api/sessionApi';
import App from './App';

describe('Restaurant Admin App', () => {
  beforeEach(() => {
    vi.mocked(loadDashboard).mockReset();
    vi.mocked(loadRecentChanges).mockReset();
    vi.mocked(setServiceWindow).mockReset();
    vi.mocked(getSessionMe).mockReset();
    window.__APP_CONFIG__ = {
      API_BASE_URL: 'http://localhost:8080',
      THALOS_AUTH_BASE_URL: 'https://auth.dream-views.com',
      THALOS_DEFAULT_RETURN_URL: 'https://restaurant-admin-demo.dream-views.com/config',
      THALOS_DEFAULT_TENANT_ID: 'demo-tenant'
    };
    window.history.pushState({}, '', '/config');
  });

  it('shows central login action when session is missing', async () => {
    vi.mocked(getSessionMe).mockResolvedValue({ isAuthenticated: false, subjectId: '', tenantId: '', provider: 0 });

    render(<App />);

    await waitFor(() => expect(screen.getByRole('link', { name: 'Continue with Google' })).toBeInTheDocument());
    const link = screen.getByRole('link', { name: 'Continue with Google' }) as HTMLAnchorElement;
    expect(link.href).toContain('/api/identity/oidc/google/start');
    expect(link.href).toContain('tenantId=demo-tenant');
  });

  it('loads admin config and recent changes for authenticated users', async () => {
    vi.mocked(getSessionMe).mockResolvedValue({
      isAuthenticated: true,
      subjectId: 'demo-user',
      tenantId: 'demo-tenant',
      provider: 2
    });
    vi.mocked(loadDashboard).mockResolvedValue({
      contextId: 'demo-context',
      summary: 'configured',
      version: 'v2',
      featureFlags: [{ key: 'pos.closeout.preview', enabled: true }],
      serviceWindows: [{ day: 1, openAt: '08:00:00', closeAt: '22:00:00', isClosed: false }],
      recentChanges: []
    });
    vi.mocked(loadRecentChanges).mockResolvedValue({
      contextId: 'demo-context',
      summary: 'changes',
      version: 'v2',
      recentChanges: [
        {
          changeId: 'CFG-100',
          category: 'feature-flag',
          description: 'Enabled POS closeout preview mode.',
          updatedBy: 'ops-lead',
          updatedAtUtc: '2026-03-31T12:00:00Z'
        }
      ]
    });

    render(<App />);

    await waitFor(() => expect(screen.getByRole('button', { name: /Load Config/ })).toBeInTheDocument());
    fireEvent.click(screen.getByRole('button', { name: /Load Config/ }));
    fireEvent.click(screen.getByRole('button', { name: /Load Recent Changes/ }));

    await waitFor(() => expect(loadDashboard).toHaveBeenCalledWith('demo-context'));
    await waitFor(() => expect(loadRecentChanges).toHaveBeenCalledWith('demo-context'));
    expect(await screen.findByText('pos.closeout.preview')).toBeInTheDocument();
    expect(await screen.findByText('CFG-100')).toBeInTheDocument();
  });

  it('applies service window and shows the latest applied snapshot', async () => {
    vi.mocked(getSessionMe).mockResolvedValue({
      isAuthenticated: true,
      subjectId: 'demo-user',
      tenantId: 'demo-tenant',
      provider: 2
    });
    vi.mocked(loadDashboard).mockResolvedValue({
      contextId: 'demo-context',
      summary: 'configured',
      version: 'v2',
      featureFlags: [],
      serviceWindows: [],
      recentChanges: []
    });
    vi.mocked(loadRecentChanges).mockResolvedValue({
      contextId: 'demo-context',
      summary: 'changes',
      version: 'v2',
      recentChanges: []
    });
    vi.mocked(setServiceWindow).mockResolvedValue({
      contextId: 'demo-context',
      applied: true,
      message: 'Service window updated by admin-operator.',
      serviceWindow: {
        day: 1,
        openAt: '08:00:00',
        closeAt: '22:00:00',
        isClosed: false
      }
    });

    render(<App />);

    await waitFor(() => expect(screen.getByText('Service Window')).toBeInTheDocument());
    fireEvent.click(screen.getByText('Service Window'));
    fireEvent.click(screen.getByRole('button', { name: 'Apply Service Window' }));

    await waitFor(() => expect(setServiceWindow).toHaveBeenCalledTimes(1));
    expect(await screen.findAllByText('Service window updated by admin-operator.')).toHaveLength(2);
    expect((await screen.findAllByText('Monday')).length).toBeGreaterThanOrEqual(2);
  });

  it('shows reauthentication guidance when the session expires', async () => {
    vi.mocked(getSessionMe)
      .mockResolvedValueOnce({
        isAuthenticated: true,
        subjectId: 'demo-user',
        tenantId: 'demo-tenant',
        provider: 2
      })
      .mockResolvedValueOnce({ isAuthenticated: false, subjectId: '', tenantId: '', provider: 2 });
    vi.mocked(loadDashboard).mockRejectedValue(new ApiError(401, 'Unauthorized request.', 'unauthorized', 'corr-401'));

    render(<App />);

    await waitFor(() => expect(screen.getByRole('button', { name: /Load Config/ })).toBeInTheDocument());
    fireEvent.click(screen.getByRole('button', { name: /Load Config/ }));

    await waitFor(() => expect(screen.getByText('Authentication Required')).toBeInTheDocument());
    expect(screen.getByText('Session expired')).toBeInTheDocument();
  });
});