nkbmusic/lib/core/models.dart

import 'package:flutter/material.dart';

/// Life events Badaga songs belong to. `id` matches the `occasion` column in Supabase.
enum Occasion {
  huttu('huttu', 'Huttu', 'Birth & naming', Color(0xFF3B6E8F), Icons.spa_outlined),
  habba('habba', 'Habba', 'Festival celebrations', Color(0xFFB5541E), Icons.celebration_outlined),
  madhuvae('madhuvae', 'Madhuvae', 'Wedding songs', Color(0xFF9C2F4A), Icons.favorite_border),
  devotional('devotional', 'Devotional', 'Hethai & temple songs', Color(0xFF6B4FA0), Icons.temple_hindu_outlined),
  folk('folk', 'Folk songs', 'Traditional melodies', Color(0xFF2E7D5B), Icons.music_note_outlined),
  saavu('saavu', 'Saavu', 'Remembrance', Color(0xFF4A4F57), Icons.local_florist_outlined),
  instrumental('instrumental', 'Instrumental', 'Flute, drums and more', Color(0xFF8A5A2B), Icons.graphic_eq);

  const Occasion(this.id, this.label, this.subtitle, this.color, this.icon);

  final String id;
  final String label;
  final String subtitle;
  final Color color;
  final IconData icon;

  static Occasion fromId(String? id) =>
      Occasion.values.firstWhere((o) => o.id == id, orElse: () => Occasion.folk);
}

enum Tier { free, premium }

class Artist {
  const Artist({required this.id, required this.name, this.hatti, this.photoUrl, this.bio});

  final String id;
  final String name;
  final String? hatti;

  /// Only set once the singer (or family) has given photo permission.
  final String? photoUrl;
  final String? bio;

  String get initials {
    final parts = name.trim().split(RegExp(r'\s+')).where((p) => p.isNotEmpty).toList();
    if (parts.isEmpty) return '?';
    if (parts.length == 1) return parts.first.substring(0, 1).toUpperCase();
    return (parts.first[0] + parts.last[0]).toUpperCase();
  }

  factory Artist.fromJson(Map<String, dynamic> j) => Artist(
        id: j['id'] as String,
        name: j['name'] as String,
        hatti: j['hatti'] as String?,
        photoUrl: j['photoUrl'] as String?,
        bio: j['bio'] as String?,
      );
}

/// A cassette, CD or folder from the collection.
class Album {
  const Album({required this.id, required this.title, this.year, this.coverUrl});

  final String id;
  final String title;
  final int? year;
  final String? coverUrl;
}

class Track {
  const Track({
    required this.id,
    required this.titleLatin,
    required this.artistIds,
    required this.occasion,
    required this.duration,
    required this.audioUrl,
    this.titleTamil,
    this.meaning,
    this.albumId,
    this.coverAsset,
    this.coverUrl,
    this.tier = Tier.free,
  });

  final String id;
  final String titleLatin;
  final String? titleTamil;

  /// English meaning of the title, also searchable.
  final String? meaning;
  final List<String> artistIds;
  final String? albumId;
  final Occasion occasion;
  final Duration duration;

  /// `asset:///...` for bundled audio, otherwise an https URL (signed R2 URL later).
  final String audioUrl;
  final String? coverAsset;
  final String? coverUrl;
  final Tier tier;

  factory Track.fromJson(Map<String, dynamic> j) => Track(
        id: j['id'] as String,
        titleLatin: j['titleLatin'] as String,
        titleTamil: j['titleTamil'] as String?,
        meaning: j['meaning'] as String?,
        artistIds: (j['artistIds'] as List).cast<String>(),
        albumId: j['albumId'] as String?,
        occasion: Occasion.fromId(j['occasion'] as String?),
        duration: Duration(milliseconds: (j['durationMs'] as num?)?.toInt() ?? 0),
        audioUrl: j['audioUrl'] as String,
        coverAsset: j['coverAsset'] as String?,
        coverUrl: j['coverUrl'] as String?,
        tier: j['tier'] == 'premium' ? Tier.premium : Tier.free,
      );
}

String formatDuration(Duration d) {
  final m = d.inMinutes;
  final s = d.inSeconds.remainder(60).toString().padLeft(2, '0');
  return '$m:$s';
}