import 'package:flutter/foundation.dart';

/// Read-only snapshot of the active Android media session.
@immutable
class MediaPlayback {
  const MediaPlayback({
    this.hasAccess = false,
    this.hasSession = false,
    this.playing = false,
    this.title,
    this.artist,
    this.packageName,
    this.durationMs = 0,
    this.positionMs = 0,
  });

  final bool hasAccess;
  final bool hasSession;
  final bool playing;
  final String? title;
  final String? artist;
  final String? packageName;
  final int durationMs;
  final int positionMs;

  bool get hasTitle => (title?.trim().isNotEmpty ?? false);

  String? get displayTitle {
    final name = title?.trim();
    if (name == null || name.isEmpty) return null;
    final by = artist?.trim();
    return by == null || by.isEmpty ? name : '$name — $by';
  }

  double get progress {
    if (durationMs <= 0) return 0;
    return (positionMs / durationMs).clamp(0.0, 1.0);
  }

  @override
  bool operator ==(Object other) {
    return other is MediaPlayback &&
        other.hasAccess == hasAccess &&
        other.hasSession == hasSession &&
        other.playing == playing &&
        other.title == title &&
        other.artist == artist &&
        other.packageName == packageName &&
        other.durationMs == durationMs &&
        other.positionMs == positionMs;
  }

  @override
  int get hashCode => Object.hash(
    hasAccess,
    hasSession,
    playing,
    title,
    artist,
    packageName,
    durationMs,
    positionMs,
  );

  factory MediaPlayback.fromMap(Map<dynamic, dynamic> map) {
    int integer(String key) => (map[key] as num?)?.toInt() ?? 0;
    String? string(String key) {
      final value = (map[key] as String?)?.trim();
      return value == null || value.isEmpty ? null : value;
    }

    return MediaPlayback(
      hasAccess: map['hasAccess'] == true,
      hasSession: map['hasSession'] == true,
      playing: map['playing'] == true,
      title: string('title'),
      artist: string('artist'),
      packageName: string('packageName'),
      durationMs: integer('durationMs'),
      positionMs: integer('positionMs'),
    );
  }
}