import { beforeEach, describe, expect, it, vi } from 'vitest';
import {
  addItemsToCollection,
  createCollection,
  createSmartCollection,
  deleteCollection,
  deleteSmartCollection,
  emptyAddItemsRequest,
  getCollectionItems,
  getCollections,
  getSmartCollections,
  removeItemFromCollection,
  toAddItemsRequest,
  updateCollection,
  updateSmartCollection
} from './collections';
import type { LibraryBrowseItem } from './libraryBrowse';

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

function noContent(): Response {
  return new Response(null, { status: 204 });
}

function browseItem(id: number, mediaType: LibraryBrowseItem['mediaType']): LibraryBrowseItem {
  return {
    artwork: '',
    collectionId: null,
    collectionKind: null,
    collectionType: 'Collection',
    duration: null,
    id,
    itemCount: null,
    libraryId: null,
    libraryName: null,
    mediaItemId: id,
    mediaType,
    multiCollectionId: null,
    playlistId: null,
    rerunCollectionId: null,
    smartCollectionId: null,
    title: 'Item'
  };
}

describe('collections api client', () => {
  beforeEach(() => {
    window.localStorage.clear();
    vi.restoreAllMocks();
  });

  it('getCollections fetches the manual collections list', async () => {
    const fetchMock = vi
      .spyOn(window, 'fetch')
      .mockResolvedValue(jsonResponse([{ id: 1, name: 'Movies', useCustomPlaybackOrder: false }]));

    await expect(getCollections()).resolves.toHaveLength(1);
    expect(fetchMock).toHaveBeenCalledWith('/api/collections', expect.objectContaining({ method: 'GET' }));
  });

  it('createCollection POSTs the name and returns the created collection', async () => {
    const fetchMock = vi
      .spyOn(window, 'fetch')
      .mockResolvedValue(jsonResponse({ id: 7, name: 'New', useCustomPlaybackOrder: false }, 201));

    await expect(createCollection({ name: 'New' })).resolves.toMatchObject({ id: 7 });

    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toBe('/api/collections');
    expect(init).toMatchObject({ method: 'POST' });
    expect(JSON.parse(String(init?.body))).toEqual({ name: 'New' });
  });

  it('updateCollection PUTs name and useCustomPlaybackOrder', async () => {
    const fetchMock = vi
      .spyOn(window, 'fetch')
      .mockResolvedValue(jsonResponse({ id: 3, name: 'Renamed', useCustomPlaybackOrder: true }));

    await updateCollection(3, { name: 'Renamed', useCustomPlaybackOrder: true });

    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toBe('/api/collections/3');
    expect(init).toMatchObject({ method: 'PUT' });
    expect(JSON.parse(String(init?.body))).toEqual({ name: 'Renamed', useCustomPlaybackOrder: true });
  });

  it('deleteCollection issues a DELETE and resolves on 204', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(noContent());

    await expect(deleteCollection(9)).resolves.toBeUndefined();
    expect(fetchMock).toHaveBeenCalledWith('/api/collections/9', expect.objectContaining({ method: 'DELETE' }));
  });

  it('addItemsToCollection POSTs the bucketed request', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(noContent());
    const body = { ...emptyAddItemsRequest(), movieIds: [11, 12] };

    await addItemsToCollection(5, body);

    const [url, init] = fetchMock.mock.calls[0];
    expect(url).toBe('/api/collections/5/items');
    expect(init).toMatchObject({ method: 'POST' });
    expect(JSON.parse(String(init?.body)).movieIds).toEqual([11, 12]);
  });

  it('removeItemFromCollection DELETEs the item by media-item id', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockResolvedValue(noContent());

    await removeItemFromCollection(5, 42);
    expect(fetchMock).toHaveBeenCalledWith('/api/collections/5/items/42', expect.objectContaining({ method: 'DELETE' }));
  });

  it('rethrows API errors (e.g. 422 on delete)', async () => {
    vi.spyOn(window, 'fetch').mockResolvedValue(
      jsonResponse({ status: 422, title: 'In use' }, 422)
    );

    await expect(deleteCollection(1)).rejects.toMatchObject({ status: 422 });
  });

  it('getSmartCollections / create / update / delete hit the smart-collection routes', async () => {
    const fetchMock = vi.spyOn(window, 'fetch').mockImplementation((input: RequestInfo | URL, init?: RequestInit) => {
      const url = input.toString();
      const method = (init?.method ?? 'GET').toUpperCase();

      if (url === '/api/smart-collections' && method === 'GET') {
        return Promise.resolve(jsonResponse([{ id: 1, name: 'Action', query: 'genre:action' }]));
      }

      if (url === '/api/smart-collections' && method === 'POST') {
        return Promise.resolve(jsonResponse({ id: 2, name: 'Sci-Fi', query: 'genre:scifi' }, 201));
      }

      if (url === '/api/smart-collections/2' && method === 'PUT') {
        return Promise.resolve(jsonResponse({ id: 2, name: 'Sci-Fi', query: 'genre:"science fiction"' }));
      }

      if (url === '/api/smart-collections/2' && method === 'DELETE') {
        return Promise.resolve(noContent());
      }

      throw new Error(`unexpected ${method} ${url}`);
    });

    await expect(getSmartCollections()).resolves.toHaveLength(1);
    await expect(createSmartCollection({ name: 'Sci-Fi', query: 'genre:scifi' })).resolves.toMatchObject({ id: 2 });
    await expect(
      updateSmartCollection(2, { name: 'Sci-Fi', query: 'genre:"science fiction"' })
    ).resolves.toMatchObject({ query: 'genre:"science fiction"' });
    await expect(deleteSmartCollection(2)).resolves.toBeUndefined();

    const createCall = fetchMock.mock.calls.find(([, init]) => (init?.method ?? '').toUpperCase() === 'POST');
    expect(JSON.parse(String(createCall?.[1]?.body))).toEqual({ name: 'Sci-Fi', query: 'genre:scifi' });
  });

  it('getCollectionItems requests the paged collection-items endpoint', async () => {
    const fetchMock = vi
      .spyOn(window, 'fetch')
      .mockResolvedValue(jsonResponse({ totalCount: 1, page: [browseItem(5, 'Movie')] }));

    const result = await getCollectionItems(7, 2, 50);

    const url = new URL(String(fetchMock.mock.calls[0][0]), 'http://localhost');
    expect(url.pathname).toBe('/api/collections/7/items');
    expect(url.searchParams.get('pageNum')).toBe('2');
    expect(url.searchParams.get('pageSize')).toBe('50');
    expect(result.totalCount).toBe(1);
  });

  it('getCollectionItems defaults to the first page of 100', async () => {
    const fetchMock = vi
      .spyOn(window, 'fetch')
      .mockResolvedValue(jsonResponse({ totalCount: 0, page: [] }));

    await getCollectionItems(9);

    const url = new URL(String(fetchMock.mock.calls[0][0]), 'http://localhost');
    expect(url.pathname).toBe('/api/collections/9/items');
    expect(url.searchParams.get('pageNum')).toBe('0');
    expect(url.searchParams.get('pageSize')).toBe('100');
  });
});

describe('toAddItemsRequest bucket mapping', () => {
  it('routes each browse media type into its own bucket using item.id', () => {
    const result = toAddItemsRequest([
      browseItem(10, 'Movie'),
      browseItem(11, 'Movie'),
      browseItem(20, 'TelevisionShow'),
      browseItem(30, 'TelevisionSeason'),
      browseItem(40, 'Artist')
    ]);

    expect(result.movieIds).toEqual([10, 11]);
    expect(result.showIds).toEqual([20]);
    expect(result.seasonIds).toEqual([30]);
    expect(result.artistIds).toEqual([40]);
  });

  it('skips kinds that are not addable media items (collections, playlists, etc.)', () => {
    const result = toAddItemsRequest([
      browseItem(1, 'Collection'),
      browseItem(2, 'SmartCollection'),
      browseItem(3, 'MultiCollection'),
      browseItem(4, 'RerunCollection'),
      browseItem(5, 'Playlist'),
      browseItem(6, 'Movie')
    ]);

    expect(result.movieIds).toEqual([6]);
    expect(result.showIds).toEqual([]);
    expect(result.seasonIds).toEqual([]);
    expect(result.artistIds).toEqual([]);
  });

  it('emptyAddItemsRequest leaves the picker-unreachable buckets empty', () => {
    const empty = emptyAddItemsRequest();

    expect(empty.episodeIds).toEqual([]);
    expect(empty.musicVideoIds).toEqual([]);
    expect(empty.otherVideoIds).toEqual([]);
    expect(empty.songIds).toEqual([]);
    expect(empty.imageIds).toEqual([]);
    expect(empty.remoteStreamIds).toEqual([]);
  });
});