// lib/remote/remote_sync_bus.dart
import 'package:flutter/foundation.dart';

class RemoteSyncProgress {
  final String phase;
  final int done;
  final int total;
  final bool finished;

  const RemoteSyncProgress({
    required this.phase,
    required this.done,
    required this.total,
    this.finished = false,
  });

  double? get value => total > 0 ? done / total : null;
}

class RemoteSyncBus {
  RemoteSyncBus._();
  static final RemoteSyncBus instance = RemoteSyncBus._();

  final ValueNotifier<RemoteSyncProgress?> notifier = ValueNotifier(null);

  void start({required String phase, required int total}) {
    notifier.value = RemoteSyncProgress(phase: phase, done: 0, total: total);
  }

  void update({required String phase, required int done, required int total}) {
    notifier.value = RemoteSyncProgress(phase: phase, done: done, total: total);
  }

  void finish({String phase = 'Completato'}) {
    final cur = notifier.value;
    if (cur == null) return;
    notifier.value = RemoteSyncProgress(
      phase: phase,
      done: cur.total,
      total: cur.total,
      finished: true,
    );
    // auto-hide dopo 1s
    Future.delayed(const Duration(seconds: 1), () {
      if (notifier.value?.finished == true) notifier.value = null;
    });
  }

  void clear() => notifier.value = null;
}