import { afterEach, describe, expect, test, vi } from 'vitest';
import { render, screen } from '@testing-library/svelte';
import { readable } from 'svelte/store';
import { mockQuery } from '../../test-utils/query';
import type { ArtistRef, AlbumRef, TrackRef, SearchResponse } from '$lib/api/types';

const state = vi.hoisted(() => ({
  pageUrl: new URL('http://localhost/search')
}));

vi.mock('$app/state', () => ({
  page: { get url() { return state.pageUrl; } }
}));

vi.mock('$lib/api/queries', () => ({
  createSearchQuery: vi.fn()
}));

vi.mock('$lib/player/store.svelte', () => ({
  playQueue: vi.fn(),
  playRadio: vi.fn(),
  enqueueTrack: vi.fn(),
  enqueueTracks: vi.fn()
}));

vi.mock('$lib/api/client', () => ({
  api: { get: vi.fn() }
}));

vi.mock('$lib/api/likes', () => ({
  createLikedIdsQuery: () => readable({
    data: { track_ids: [], album_ids: [], artist_ids: [] },
    isPending: false,
    isError: false
  }),
  likeEntity: vi.fn(),
  unlikeEntity: vi.fn()
}));

vi.mock('@tanstack/svelte-query', async (orig) => {
  const actual = (await orig()) as Record<string, unknown>;
  return { ...actual, useQueryClient: () => ({}) };
});

import SearchPage from './+page.svelte';
import { createSearchQuery } from '$lib/api/queries';

function emptyResp(): SearchResponse {
  return {
    artists: { items: [], total: 0, limit: 10, offset: 0 },
    albums:  { items: [], total: 0, limit: 10, offset: 0 },
    tracks:  { items: [], total: 0, limit: 10, offset: 0 }
  };
}

const artist: ArtistRef = { id: 'a1', name: 'Miles Davis', sort_name: 'Miles Davis', album_count: 12, cover_url: '' };
const album: AlbumRef = {
  id: 'al1', title: 'Kind of Blue', sort_title: 'Kind of Blue', artist_id: 'a1', artist_name: 'Miles Davis',
  year: 1959, track_count: 5, duration_sec: 2630, cover_url: '/api/albums/al1/cover'
};
const track: TrackRef = {
  id: 't1', title: 'So What',
  album_id: 'al1', album_title: 'Kind of Blue',
  artist_id: 'a1', artist_name: 'Miles Davis',
  track_number: 1, disc_number: 1, duration_sec: 545,
  stream_url: '/api/tracks/t1/stream'
};

afterEach(() => {
  vi.clearAllMocks();
  state.pageUrl = new URL('http://localhost/search');
});

describe('search page', () => {
  test('empty ?q= shows the "Start typing" prompt and fires no query', () => {
    state.pageUrl = new URL('http://localhost/search');
    render(SearchPage);
    expect(screen.getByText(/start typing/i)).toBeInTheDocument();
    expect(createSearchQuery).not.toHaveBeenCalled();
  });

  test('all three sections render when all three facets have items', () => {
    state.pageUrl = new URL('http://localhost/search?q=miles');
    const resp: SearchResponse = {
      ...emptyResp(),
      artists: { items: [artist], total: 1, limit: 10, offset: 0 },
      albums:  { items: [album],  total: 1, limit: 10, offset: 0 },
      tracks:  { items: [track],  total: 1, limit: 10, offset: 0 }
    };
    (createSearchQuery as ReturnType<typeof vi.fn>).mockReturnValue(mockQuery({ data: resp }));
    render(SearchPage);
    expect(screen.getByRole('heading', { name: /artists/i })).toBeInTheDocument();
    expect(screen.getByRole('heading', { name: /albums/i })).toBeInTheDocument();
    expect(screen.getByRole('heading', { name: /tracks/i })).toBeInTheDocument();
  });

  test('empty facets are hidden', () => {
    state.pageUrl = new URL('http://localhost/search?q=miles');
    const resp: SearchResponse = {
      ...emptyResp(),
      tracks: { items: [track], total: 1, limit: 10, offset: 0 }
    };
    (createSearchQuery as ReturnType<typeof vi.fn>).mockReturnValue(mockQuery({ data: resp }));
    render(SearchPage);
    expect(screen.queryByRole('heading', { name: /artists/i })).not.toBeInTheDocument();
    expect(screen.queryByRole('heading', { name: /albums/i })).not.toBeInTheDocument();
    expect(screen.getByRole('heading', { name: /tracks/i })).toBeInTheDocument();
  });

  test('"See all N →" link renders when total > items.length', () => {
    state.pageUrl = new URL('http://localhost/search?q=miles');
    const resp: SearchResponse = {
      ...emptyResp(),
      artists: { items: [artist], total: 47, limit: 10, offset: 0 }
    };
    (createSearchQuery as ReturnType<typeof vi.fn>).mockReturnValue(mockQuery({ data: resp }));
    render(SearchPage);
    const link = screen.getByRole('link', { name: /see all 47/i });
    expect(link).toHaveAttribute('href', '/search/artists?q=miles');
  });

  test('"See all" link omitted when total === items.length', () => {
    state.pageUrl = new URL('http://localhost/search?q=miles');
    const resp: SearchResponse = {
      ...emptyResp(),
      tracks: { items: [track], total: 1, limit: 10, offset: 0 }
    };
    (createSearchQuery as ReturnType<typeof vi.fn>).mockReturnValue(mockQuery({ data: resp }));
    render(SearchPage);
    expect(screen.queryByRole('link', { name: /see all/i })).not.toBeInTheDocument();
  });

  test('all three facets empty renders "No matches"', () => {
    state.pageUrl = new URL('http://localhost/search?q=zzz');
    (createSearchQuery as ReturnType<typeof vi.fn>).mockReturnValue(
      mockQuery({ data: emptyResp() })
    );
    render(SearchPage);
    expect(screen.getByText(/no matches for/i)).toBeInTheDocument();
    expect(screen.getByText(/zzz/)).toBeInTheDocument();
  });

  test('error state renders ApiErrorBanner', () => {
    state.pageUrl = new URL('http://localhost/search?q=miles');
    (createSearchQuery as ReturnType<typeof vi.fn>).mockReturnValue(
      mockQuery({ isError: true, error: { code: 'server_error', message: 'boom' } })
    );
    render(SearchPage);
    expect(screen.getByRole('alert')).toBeInTheDocument();
  });
});
