import 'dart:async';

import 'package:aves/services/cast/cast_hls_cache.dart';
import 'package:aves/services/cast/cast_video_cache.dart';
import 'package:flutter/foundation.dart';

class CastCacheCleanup {
  CastCacheCleanup._();

  static bool _started = false;

  /// Avvia una sola volta per processo la pulizia delle cache video Cast.
  ///
  /// Non include le immagini ottimizzate, che CastServer conserva
  /// esclusivamente in RAM.
  static void startOnce() {
    if (_started) {
      return;
    }

    _started = true;

    /*
     * Non blocca la visualizzazione dell'app. Gli errori vengono gestiti
     * separatamente per ciascuna cache.
     */
    unawaited(_cleanup());
  }

  static Future<void> _cleanup() async {
    final stopwatch = Stopwatch()..start();

    final results = await Future.wait<String>([
      _runSafely(
        name: 'hls',
        cleanup: castHlsCache.cleanupExpired,
      ),
      _runSafely(
        name: 'videos',
        cleanup: castVideoCache.cleanupExpired,
      ),
    ]);

    stopwatch.stop();

    debugPrint(
      '[CAST CACHE CLEANUP] COMPLETE '
      'maxAgeHours=24 '
      'elapsedMs=${stopwatch.elapsedMilliseconds} '
      'results=$results',
    );
  }

  static Future<String> _runSafely({
    required String name,
    required Future<void> Function() cleanup,
  }) async {
    try {
      await cleanup();
      return '$name:ok';
    } catch (error, stackTrace) {
      debugPrint(
        '[CAST CACHE CLEANUP] ROOT ERROR '
        'cache=$name '
        'error=$error',
      );

      debugPrint(
        '[CAST CACHE CLEANUP] ROOT STACK '
        'cache=$name\n'
        '$stackTrace',
      );

      return '$name:error';
    }
  }
}