nkbmusic/lib/features/artist/artist_screen.dart

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

import '../../app/theme.dart';
import '../../audio/player_providers.dart';
import '../../core/models.dart';
import '../../shared/widgets/artwork.dart';
import '../../shared/widgets/catalog_builder.dart';
import '../../shared/widgets/mini_player.dart';
import '../../shared/widgets/section_header.dart';
import '../../shared/widgets/track_tile.dart';

class ArtistScreen extends ConsumerWidget {
  const ArtistScreen({super.key, required this.artistId});

  final String artistId;

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    return Scaffold(
      bottomNavigationBar: const SafeArea(child: MiniPlayer()),
      body: CatalogBuilder(builder: (catalog) {
        final artist = catalog.artistsById[artistId];
        if (artist == null) {
          return const SafeArea(
            child: EmptyState(icon: Icons.person_off_outlined, title: 'Singer not found'),
          );
        }
        final songs = catalog.byArtist(artistId);
        final controller = ref.read(playerControllerProvider);
        final subtitle = ['Singer', ...songs.map((s) => s.occasion.label).toSet(), ?artist.hatti].join(' · ');

        return CustomScrollView(
          slivers: [
            SliverAppBar(
              pinned: true,
              expandedHeight: 320,
              backgroundColor: NkColors.ground,
              flexibleSpace: FlexibleSpaceBar(
                background: Stack(
                  fit: StackFit.expand,
                  children: [
                    if (artist.photoUrl != null)
                      CachedNetworkImage(imageUrl: artist.photoUrl!, fit: BoxFit.cover)
                    else
                      Image.asset('assets/images/nilgiris_tea.jpg', fit: BoxFit.cover, alignment: const Alignment(0, -0.2)),
                    const PhotoScrim(stops: [0.3, 1]),
                    if (artist.photoUrl == null)
                      Positioned(
                        right: 16,
                        top: MediaQuery.paddingOf(context).top + 12,
                        child: Container(
                          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
                          decoration: BoxDecoration(
                            color: NkColors.ground.withValues(alpha: 0.7),
                            borderRadius: BorderRadius.circular(14),
                            border: Border.all(color: NkColors.teaLeaf),
                          ),
                          child: const Text('Singer photo pending', style: TextStyle(fontSize: 12, fontWeight: FontWeight.w700)),
                        ),
                      ),
                    Positioned(
                      left: 20,
                      right: 20,
                      bottom: 16,
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: [
                          Text(artist.name, style: Theme.of(context).textTheme.headlineLarge),
                          const SizedBox(height: 6),
                          Text(subtitle, style: const TextStyle(color: NkColors.mutedOnPhoto, fontSize: 15)),
                        ],
                      ),
                    ),
                  ],
                ),
              ),
            ),
            SliverPadding(
              padding: const EdgeInsets.fromLTRB(20, 12, 20, 8),
              sliver: SliverToBoxAdapter(
                child: Row(
                  children: [
                    Text('${songs.length} songs', style: const TextStyle(color: NkColors.muted)),
                    const Spacer(),
                    IconButton(
                      tooltip: 'Shuffle',
                      icon: const Icon(Icons.shuffle, color: NkColors.sun),
                      onPressed: songs.isEmpty ? null : () => controller.playTracks(songs, shuffle: true),
                    ),
                    IconButton.filled(
                      tooltip: 'Play all',
                      style: IconButton.styleFrom(fixedSize: const Size(56, 56)),
                      onPressed: songs.isEmpty ? null : () => controller.playTracks(songs),
                      icon: const Icon(Icons.play_arrow_rounded, size: 30),
                    ),
                  ],
                ),
              ),
            ),
            SliverPadding(
              padding: const EdgeInsets.symmetric(horizontal: 20),
              sliver: SliverList.builder(
                itemCount: songs.length,
                itemBuilder: (_, i) => TrackTile(
                  track: songs[i],
                  subtitle: '${songs[i].occasion.label} · ${formatDuration(songs[i].duration)}',
                  onTap: () => controller.playTracks(songs, index: i),
                ),
              ),
            ),
            if (artist.bio != null)
              SliverPadding(
                padding: const EdgeInsets.all(20),
                sliver: SliverToBoxAdapter(
                  child: Container(
                    padding: const EdgeInsets.all(16),
                    decoration: BoxDecoration(color: NkColors.surface, borderRadius: BorderRadius.circular(16)),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Text('About', style: Theme.of(context).textTheme.titleMedium),
                        const SizedBox(height: 6),
                        Text(artist.bio!, style: const TextStyle(color: Color(0xFFC9D6CE), height: 1.5)),
                      ],
                    ),
                  ),
                ),
              ),
          ],
        );
      }),
    );
  }
}