SpotiFLAC-Mobile/lib/utils/playback_artwork.dart

import 'dart:io';

/// Recover a scanned document's missing thumbnail without rescanning its NAS.
/// Callers run this separately from preparing audio and discard stale results.
Future<String?> resolveMissingDocumentArtworkUri(
  String source,
  String? artwork, {
  required Future<String?> Function(String) extract,
}) async {
  if (!source.startsWith('content://')) return null;
  try {
    if (artwork != null && artwork.isNotEmpty) {
      final uri = Uri.parse(artwork);
      if (uri.hasScheme && uri.scheme != 'file') return null;
      final path = uri.scheme == 'file' ? uri.toFilePath() : artwork;
      if (await File(path).exists()) return null;
    }
    final cover = await extract(source);
    return cover == null ? null : Uri.file(cover).toString();
  } catch (_) {
    return null;
  }
}

/// A saved queue may outlive the scan directory that supplied its artwork.
/// Consult the Library only when the saved local image is missing.
Future<String?> resolveRestoredArtworkUri(
  String? artwork, {
  required Future<String?> Function() loadLibraryCoverPath,
}) async {
  try {
    if (artwork != null && artwork.isNotEmpty) {
      final uri = Uri.parse(artwork);
      if (uri.hasScheme && uri.scheme != 'file') return artwork;
      final path = uri.scheme == 'file' ? uri.toFilePath() : artwork;
      if (await File(path).exists()) return artwork;
    }
    final cover = await loadLibraryCoverPath();
    if (cover == null || cover.isEmpty) return artwork;
    final path = cover.startsWith('file://')
        ? Uri.parse(cover).toFilePath()
        : cover;
    if (await File(path).exists()) return Uri.file(path).toString();
  } catch (_) {
    // Missing artwork or an unavailable Library must not discard playback.
  }
  return artwork;
}