import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';

import 'package:minstrel/api/endpoints/playlists.dart';
import 'package:minstrel/library/home_screen.dart';
import 'package:minstrel/library/library_providers.dart';
import 'package:minstrel/models/home_index.dart';
import 'package:minstrel/models/playlist.dart';
import 'package:minstrel/models/system_playlists_status.dart';
import 'package:minstrel/playlists/playlists_provider.dart';
import 'package:minstrel/theme/theme_data.dart';

// All tests pump an empty HomeIndex unless they care about populated
// section IDs — per-tile hydration is intentionally not exercised here.
// What this suite verifies is the screen's section-level shape:
// placeholders / empty-state copy / section presence given the index.
const _emptyIndex = HomeIndex.empty;

void main() {
  testWidgets('renders 4 placeholder cards in Playlists row when no system playlists exist',
      (tester) async {
    await tester.pumpWidget(ProviderScope(
      overrides: [
        homeIndexProvider.overrideWith((ref) => Stream.value(_emptyIndex)),
        playlistsListProvider('all').overrideWith(
          (ref) => Stream.value(PlaylistsList.empty()),
        ),
        systemPlaylistsStatusProvider.overrideWith(
          (ref) => Stream.value(SystemPlaylistsStatus.empty()),
        ),
      ],
      child: MaterialApp(theme: buildThemeData(), home: const HomeScreen()),
    ));
    await tester.pumpAndSettle();
    // For-You placeholder + Discover placeholder + 3 Songs-like placeholders.
    expect(find.text('For You'), findsOneWidget);
    expect(find.text('Discover'), findsOneWidget);
    expect(find.text('Songs like…'), findsNWidgets(3));
  });

  testWidgets('renders empty-state copy for each section when the index is empty',
      (tester) async {
    await tester.pumpWidget(ProviderScope(
      overrides: [
        homeIndexProvider.overrideWith((ref) => Stream.value(_emptyIndex)),
        playlistsListProvider('all').overrideWith(
          (ref) => Stream.value(PlaylistsList.empty()),
        ),
        systemPlaylistsStatusProvider.overrideWith(
          (ref) => Stream.value(SystemPlaylistsStatus.empty()),
        ),
      ],
      child: MaterialApp(theme: buildThemeData(), home: const HomeScreen()),
    ));
    await tester.pumpAndSettle();
    expect(
      find.text("Nothing added yet. Scan a folder via the server's config."),
      findsOneWidget,
    );
    expect(
      find.text('No forgotten favourites yet. Like some albums or artists to fill this in.'),
      findsOneWidget,
    );
    expect(find.text('No plays to draw from. Listen to something.'),
        findsOneWidget);
    expect(find.text('No recent plays.'), findsOneWidget);
  });

  testWidgets('renders For-You card when system playlist exists',
      (tester) async {
    const forYou = Playlist(
      id: 'fy',
      userId: 'u1',
      name: 'For You',
      description: '',
      isPublic: false,
      systemVariant: 'for_you',
      trackCount: 75,
      coverUrl: '',
      ownerUsername: 'alice',
      createdAt: '2026-05-01T00:00:00Z',
      updatedAt: '2026-05-01T00:00:00Z',
    );
    await tester.pumpWidget(ProviderScope(
      overrides: [
        homeIndexProvider.overrideWith((ref) => Stream.value(_emptyIndex)),
        playlistsListProvider('all').overrideWith(
          (ref) => Stream.value(
              const PlaylistsList(owned: [forYou], public: [])),
        ),
        systemPlaylistsStatusProvider.overrideWith(
          (ref) => Stream.value(SystemPlaylistsStatus.empty()),
        ),
      ],
      child: MaterialApp(theme: buildThemeData(), home: const HomeScreen()),
    ));
    await tester.pumpAndSettle();
    // The real card carries the playlist name + the "for you" badge.
    expect(find.text('For You'), findsOneWidget);
    expect(find.text('for you'), findsOneWidget);
  });

  // Section-with-populated-IDs coverage lives in the drift-tagged
  // integration suite (Slice F follow-up) because per-tile providers
  // require a real (in-memory) drift DB. The flutter-ci runner skips
  // drift tests pending libsqlite3.
}