import { afterEach, describe, expect, test, vi } from 'vitest';
import { render, screen, fireEvent } from '@testing-library/svelte';
import type { AlbumRef, AlbumDetail, TrackRef } from '$lib/api/types';
import { FALLBACK_COVER } from '$lib/media/covers';
import { readable } from 'svelte/store';

vi.mock('$lib/api/client', () => ({
  api: { get: vi.fn() }
}));
vi.mock('$lib/player/store.svelte', () => ({
  enqueueTracks: vi.fn(),
  playQueue: 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 AlbumCard from './AlbumCard.svelte';
import { api } from '$lib/api/client';
import { enqueueTracks, playQueue } from '$lib/player/store.svelte';

const album: AlbumRef = {
  id: 'xyz',
  title: 'Kind of Blue',
  sort_title: 'Kind of Blue',
  artist_id: 'm-davis',
  artist_name: 'Miles Davis',
  year: 1959,
  track_count: 5,
  duration_sec: 2630,
  cover_url: '/api/albums/xyz/cover',
};

afterEach(() => vi.clearAllMocks());

describe('AlbumCard', () => {
  test('renders cover, title, year inside a link to /albums/:id', () => {
    const { container } = render(AlbumCard, { props: { album } });
    const link = screen.getByRole('link');
    expect(link).toHaveAttribute('href', '/albums/xyz');
    expect(link).toHaveTextContent('Kind of Blue');
    expect(link).toHaveTextContent('1959');

    const img = container.querySelector('img') as HTMLImageElement;
    expect(img.src).toContain('/api/albums/xyz/cover');
  });

  test('year is omitted when not present', () => {
    render(AlbumCard, { props: { album: { ...album, year: undefined } } });
    expect(screen.queryByText(/1959/)).not.toBeInTheDocument();
  });

  test('broken cover falls back to FALLBACK_COVER asset', async () => {
    const { container } = render(AlbumCard, { props: { album } });
    const img = container.querySelector('img') as HTMLImageElement;
    await fireEvent.error(img);
    // jsdom resolves relative URLs against the test origin; assert containment
    // rather than strict equality to keep the test agnostic of the host.
    expect(img.src).toContain(FALLBACK_COVER);
  });

  test('+ queue button fetches album detail and calls enqueueTracks', async () => {
    const tracks: TrackRef[] = [
      {
        id: 't1', title: 'So What',
        album_id: 'xyz', album_title: 'Kind of Blue',
        artist_id: 'm-davis', artist_name: 'Miles Davis',
        track_number: 1, disc_number: 1, duration_sec: 545,
        stream_url: '/api/tracks/t1/stream'
      }
    ];
    const detail: AlbumDetail = { ...album, tracks };
    (api.get as ReturnType<typeof vi.fn>).mockResolvedValueOnce(detail);

    render(AlbumCard, { props: { album } });
    await fireEvent.click(screen.getByRole('button', { name: /add to queue/i }));

    expect(api.get).toHaveBeenCalledWith('/api/albums/xyz');
    await Promise.resolve();
    await Promise.resolve();
    expect(enqueueTracks).toHaveBeenCalledWith(tracks);
  });

  test('play overlay click fetches album detail and calls playQueue at index 0', async () => {
    const tracks: TrackRef[] = [
      { id: 't1', title: 'So What',
        album_id: 'xyz', album_title: 'Kind of Blue',
        artist_id: 'm-davis', artist_name: 'Miles Davis',
        track_number: 1, disc_number: 1, duration_sec: 545,
        stream_url: '/api/tracks/t1/stream' }
    ];
    const detail: AlbumDetail = { ...album, tracks };
    (api.get as ReturnType<typeof vi.fn>).mockResolvedValueOnce(detail);

    render(AlbumCard, { props: { album } });
    await fireEvent.click(screen.getByRole('button', { name: /play kind of blue/i }));
    expect(api.get).toHaveBeenCalledWith('/api/albums/xyz');
    await Promise.resolve();
    await Promise.resolve();
    expect(playQueue).toHaveBeenCalledWith(tracks, 0);
  });
});
