import { act, fireEvent, render, screen, within } from '@testing-library/react';
import { HomeView } from '@/components/HomeView';
import { FilterBar } from '@/components/FilterBar';
import { fetchSchools } from '@/lib/api';
import { track } from '@/lib/analytics';
import { primaryFixture } from '../support/schoolFixtures';
import type { SchoolsResponse } from '@/lib/types';

/*
 * The results toolbar (option B of the 2026-09-30 results-controls mockups):
 * search, filters and the List/Map switch pinned under the header, with a
 * floating List/Map button standing in for the switch on phones. Layout is CSS
 * and not visible to jsdom; these pin the behaviour and the accessible names
 * the E2E journeys rely on.
 */

let params = new URLSearchParams('postcode=SW196AR&radius=1');
const push = jest.fn();
jest.mock('next/navigation', () => ({
  useSearchParams: () => params,
  usePathname: () => '/',
  useRouter: () => ({ push, replace: jest.fn(), prefetch: jest.fn() }),
}));
jest.mock('@/context/ComparisonContext', () => ({
  useComparisonContext: () => ({ addSchool: jest.fn(), removeSchool: jest.fn(), selectedSchools: [] }),
}));
jest.mock('@/lib/api', () => ({
  fetchSchools: jest.fn(),
  fetchNationalAverages: jest.fn(async () => ({})),
  fetchLAaverages: jest.fn(async () => ({ secondary: { attainment_8_by_la: {} } })),
}));
jest.mock('@/lib/analytics', () => ({ track: jest.fn() }));
jest.mock('@/components/SchoolMap', () => ({ SchoolMap: () => <div data-testid="map" /> }));

const filters = {
  local_authorities: ['Wandsworth'], school_types: ['Community school'], years: [],
  phases: ['Primary', 'Secondary'], genders: [], admissions_policies: [],
  school_type_groups: [{ value: 'council', label: 'State school: council-run' }],
};

function results(): SchoolsResponse {
  return { schools: [{ ...primaryFixture.schoolInfo, school_name: 'Southmead Primary School' }],
    total: 1, page: 1, page_size: 25, total_pages: 1 };
}

beforeEach(() => {
  params = new URLSearchParams('postcode=SW196AR&radius=1');
  push.mockClear();
  jest.mocked(track).mockClear();
  jest.mocked(fetchSchools).mockReset().mockResolvedValue(results());
});

describe('the List/Map switch', () => {
  it('lives in the toolbar with the filters and says which view is on', () => {
    render(<HomeView initialSchools={results()} filters={filters} />);
    const view = screen.getByRole('group', { name: 'Results view' });
    expect(view.closest('div[class*="resultsToolbar"]')).not.toBeNull();
    // A postcode search opens on the map.
    expect(screen.getByRole('button', { name: 'Map' })).toHaveAttribute('aria-pressed', 'true');
    expect(screen.getByRole('button', { name: 'List' })).toHaveAttribute('aria-pressed', 'false');
  });

  it('has a floating twin that flips between map and list', async () => {
    render(<HomeView initialSchools={results()} filters={filters} />);
    await act(async () => {});
    fireEvent.click(screen.getByRole('button', { name: 'Show list' }));
    expect(screen.queryByTestId('map')).not.toBeInTheDocument();
    expect(screen.getByRole('button', { name: 'List' })).toHaveAttribute('aria-pressed', 'true');
    expect(track).toHaveBeenCalledWith('results_view_changed', { view: 'list', via: 'floating' });

    await act(async () => fireEvent.click(screen.getByRole('button', { name: 'Show map' })));
    expect(screen.getByTestId('map')).toBeInTheDocument();
    expect(screen.getByRole('button', { name: 'Show list' })).toBeInTheDocument();
  });

  it('does not track a click on the view already showing', async () => {
    render(<HomeView initialSchools={results()} filters={filters} />);
    await act(async () => {});
    fireEvent.click(screen.getByRole('button', { name: 'Map' }));
    expect(track).not.toHaveBeenCalledWith('results_view_changed', expect.anything());
  });

  it('is absent from a name search, which has no map', () => {
    params = new URLSearchParams('search=southmead');
    render(<HomeView initialSchools={results()} filters={filters} />);
    expect(screen.queryByRole('group', { name: 'Results view' })).not.toBeInTheDocument();
    expect(screen.queryByRole('button', { name: 'Show map' })).not.toBeInTheDocument();
  });
});

describe('the toolbar filters', () => {
  it('keeps distance, phase and school type in the row, not behind More filters', () => {
    render(<FilterBar filters={filters} />);
    const row = screen.getByRole('group', { name: 'Filters' });
    for (const name of ['Distance', 'Phase', 'School type']) {
      expect(row).toContainElement(screen.getByRole('combobox', { name }));
    }
    expect(screen.getByRole('combobox', { name: 'Distance' })).toHaveDisplayValue('Within 1 mile');
    expect(screen.queryByRole('combobox', { name: 'Local authority' })).not.toBeInTheDocument();
  });

  it('counts only what More filters hides', () => {
    params = new URLSearchParams('postcode=SW196AR&radius=1&school_type=council&local_authority=Wandsworth');
    render(<FilterBar filters={filters} />);
    expect(screen.getByRole('button', { name: /More filters \(1\)/ })).toBeInTheDocument();
  });
});

describe('the phone chips line', () => {
  it('drops its "more this way" fade when nothing is left to scroll', () => {
    params = new URLSearchParams('postcode=SW196AR&radius=1&phase=primary');
    render(<FilterBar filters={filters} />);
    // jsdom lays nothing out, so the line reads as not overflowing at all.
    const line = screen.getByRole('group', { name: 'Applied filters' }).parentElement!;
    expect(line.className).toMatch(/controlsAtEnd/);
  });
});

describe('the phone filter sheet', () => {
  it('offers the results total', () => {
    render(<HomeView initialSchools={results()} filters={filters} />);
    fireEvent.click(screen.getByRole('button', { name: 'Filters' }));
    expect(screen.getByRole('button', { name: 'Show 1 school' })).toBeInTheDocument();
  });
});

describe('the folded search', () => {
  it('summarises the search and unfolds on tap', () => {
    render(<FilterBar filters={filters} />);
    const summary = screen.getByRole('button', { name: 'Edit search: SW196AR, within 1 mile' });
    fireEvent.click(summary);
    expect(screen.queryByRole('button', { name: /Edit search/ })).not.toBeInTheDocument();
  });

  it('folds again once the edited search is submitted', () => {
    render(<FilterBar filters={filters} />);
    fireEvent.click(screen.getByRole('button', { name: /Edit search/ }));
    const input = screen.getByRole('searchbox', { name: 'School name or postcode' });
    fireEvent.change(input, { target: { value: 'SW19 1AA' } });
    fireEvent.submit(input.closest('form')!);
    expect(screen.getByRole('button', { name: /Edit search/ })).toBeInTheDocument();
  });

  it('refolds and shows the new text when the search changes some other way', () => {
    const view = render(<FilterBar filters={filters} />);
    fireEvent.click(screen.getByRole('button', { name: /Edit search/ }));
    fireEvent.change(screen.getByRole('searchbox', { name: 'School name or postcode' }),
      { target: { value: 'half-typed' } });

    // Back button: the URL changes under the component, nothing is submitted.
    params = new URLSearchParams('postcode=SW170AA&radius=3');
    view.rerender(<FilterBar filters={filters} />);

    expect(screen.getByRole('button', { name: 'Edit search: SW170AA, within 3 miles' }))
      .toBeInTheDocument();
    expect(screen.getByRole('searchbox', { name: 'School name or postcode' }))
      .toHaveValue('SW170AA');
  });

  it('never appears in the hero, or before anything has been searched', () => {
    const { unmount } = render(<FilterBar filters={filters} isHero />);
    expect(screen.queryByRole('button', { name: /Edit search/ })).not.toBeInTheDocument();
    unmount();
    params = new URLSearchParams('local_authority=Wandsworth');
    render(<FilterBar filters={filters} />);
    expect(screen.queryByRole('button', { name: /Edit search/ })).not.toBeInTheDocument();
  });
});

describe('the results list', () => {
  it('repeats no applied filters above the results; the filter bar shows them', () => {
    params = new URLSearchParams('search=southmead&school_type=council&local_authority=Wandsworth');
    const { container } = render(<HomeView initialSchools={results()} filters={filters} />);
    expect(container.querySelector('[class*="activeFilters"]')).toBeNull();
    expect(screen.queryByText('Search: southmead')).not.toBeInTheDocument();
  });
});

describe('the desktop Clear all', () => {
  const row = () => screen.getByRole('group', { name: 'Filters' });

  it('removes the filters and keeps the search, rather than going home', () => {
    params = new URLSearchParams('postcode=SW196AR&radius=3&phase=primary&school_type=council&local_authority=Wandsworth');
    render(<FilterBar filters={filters} />);
    fireEvent.click(within(row()).getByRole('button', { name: 'Clear all' }));
    const pushed = push.mock.calls.at(-1)![0] as string;
    const next = new URLSearchParams(pushed.split('?')[1]);
    expect(next.get('postcode')).toBe('SW196AR');
    expect(next.get('radius')).toBe('3');
    for (const key of ['phase', 'school_type', 'local_authority']) expect(next.get(key)).toBeNull();
  });

  it('is not offered when only a search is applied', () => {
    params = new URLSearchParams('search=southmead');
    render(<FilterBar filters={filters} />);
    expect(within(row()).queryByRole('button', { name: /^Clear/ })).not.toBeInTheDocument();
  });
});