import { afterEach, describe, expect, it, vi } from 'vitest';
import {
  getLibraryBrowseItems,
  searchLibraryPickerOptions,
  titleContainsQuery,
  LIBRARY_PICKER_LUCENE_SPECIALS,
  LIBRARY_PICKER_RESULTS
} from './libraryBrowse';

function jsonResponse(body: unknown, status = 200): Response {
  return new Response(JSON.stringify(body), {
    headers: { 'Content-Type': 'application/json' },
    status
  });
}

function browseUrl(fetchMock: ReturnType<typeof vi.spyOn>): URL {
  return new URL(String(fetchMock.mock.calls[0][0]), 'http://localhost');
}

describe('getLibraryBrowseItems', () => {
  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('maps the paging/library/mediaType params into the query string', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(jsonResponse({ page: [], totalCount: 0 }));

    await getLibraryBrowseItems({
      query: 'star',
      libraryId: 5,
      mediaType: 'TelevisionShow',
      pageNum: 2,
      pageSize: 25
    });

    const url = browseUrl(fetchMock);
    expect(url.pathname).toBe('/api/v1/library/browse');
    expect(url.searchParams.get('query')).toBe('star');
    expect(url.searchParams.get('libraryId')).toBe('5');
    expect(url.searchParams.get('mediaType')).toBe('TelevisionShow');
    expect(url.searchParams.get('pageNum')).toBe('2');
    expect(url.searchParams.get('pageSize')).toBe('25');
    expect(url.searchParams.has('parentId')).toBe(false);
  });

  it('sends parentId to scope seasons to a specific show', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(jsonResponse({ page: [], totalCount: 0 }));

    await getLibraryBrowseItems({ mediaType: 'TelevisionSeason', parentId: 42, pageSize: 100 });

    const url = browseUrl(fetchMock);
    expect(url.searchParams.get('mediaType')).toBe('TelevisionSeason');
    expect(url.searchParams.get('parentId')).toBe('42');
  });

  it('omits parentId when it is not provided', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(jsonResponse({ page: [], totalCount: 0 }));

    await getLibraryBrowseItems({ mediaType: 'Movie' });

    expect(browseUrl(fetchMock).searchParams.has('parentId')).toBe(false);
  });
});

describe('titleContainsQuery (#651 — compile typed text, never forward raw Lucene)', () => {
  it('wraps the escaped text in boundary wildcards on the title field', () => {
    expect(titleContainsQuery('Show Alpha')).toBe('title:*Show\\ Alpha*');
  });

  // The previous version of this test hand-copied a sample string and claimed to cover "every
  // Lucene special" — it silently omitted `&` and `|`, and a completeness test that carries its own
  // list of what to check cannot see what is missing from that list (#651 F2). Drive the assertion
  // from the exported character set instead, one character at a time, so adding a character to the
  // set without escaping it fails here.
  it.each(LIBRARY_PICKER_LUCENE_SPECIALS.split(''))('escapes the Lucene special %j', (char) => {
    expect(titleContainsQuery(`a${char}b`)).toBe(`title:*a\\${char}b*`);
  });

  it.each([' ', '\t', '\n'])('escapes whitespace %j so it cannot split the term', (char) => {
    expect(titleContainsQuery(`a${char}b`)).toBe(`title:*a\\${char}b*`);
  });

  it('leaves every character that is NOT special untouched', () => {
    const plain = 'abcXYZ019_,.\'@#$%';
    for (const char of plain) {
      expect(LIBRARY_PICKER_LUCENE_SPECIALS).not.toContain(char);
    }
    expect(titleContainsQuery(plain)).toBe(`title:*${plain}*`);
  });

  it('neutralises the && and || BOOLEAN operators, not just single characters (#651 F2)', () => {
    // The regression: `Rock && Roll` used to compile with `&&` live, so Lucene parsed it as boolean
    // syntax (or rejected the query) and an exactly-matching title returned nothing.
    expect(titleContainsQuery('Rock && Roll')).toBe('title:*Rock\\ \\&\\&\\ Roll*');
    expect(titleContainsQuery('A || B')).toBe('title:*A\\ \\|\\|\\ B*');
    expect(titleContainsQuery('Rock & Roll')).toBe('title:*Rock\\ \\&\\ Roll*');
  });

  it('leaves a plain single word alone apart from the boundary stars', () => {
    expect(titleContainsQuery('Alpha')).toBe('title:*Alpha*');
  });
});

describe('searchLibraryPickerOptions (#651)', () => {
  afterEach(() => {
    vi.restoreAllMocks();
  });

  it('issues ONE bounded request with the compiled query and maps to {id, name}', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(
      jsonResponse({
        page: [
          { id: 1, mediaItemId: 7, mediaType: 'Movie', title: 'Show Alpha' },
          { id: 2, mediaItemId: null, mediaType: 'Movie', title: null }
        ],
        totalCount: 20000
      })
    );

    const options = await searchLibraryPickerOptions('Movie', '  Show Alpha  ');

    expect(fetchMock).toHaveBeenCalledTimes(1);
    const url = browseUrl(fetchMock);
    expect(url.searchParams.get('query')).toBe('title:*Show\\ Alpha*');
    expect(url.searchParams.get('mediaType')).toBe('Movie');
    expect(url.searchParams.get('pageNum')).toBe('0');
    expect(url.searchParams.get('pageSize')).toBe(String(LIBRARY_PICKER_RESULTS));
    // `mediaItemId` wins when present; `id` is the fallback, and a missing title degrades to `#id`.
    expect(options).toEqual([
      { id: 7, name: 'Show Alpha' },
      { id: 2, name: '#2' }
    ]);
  });

  it('#651 F4: CLAMPS an oversized pageSize rather than forwarding it', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(jsonResponse({ page: [], totalCount: 20000 }));

    await searchLibraryPickerOptions('Episode', 'Alpha', 5000);

    // The 25-row bound is a property of the helper, not of caller discipline.
    expect(browseUrl(fetchMock).searchParams.get('pageSize')).toBe(String(LIBRARY_PICKER_RESULTS));
  });

  it('issues NO request for a query below the minimum length', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(jsonResponse({ page: [], totalCount: 0 }));

    expect(await searchLibraryPickerOptions('Episode', 'a')).toEqual([]);
    expect(await searchLibraryPickerOptions('Episode', '   ')).toEqual([]);
    expect(fetchMock).not.toHaveBeenCalled();
  });
});