import 'package:flutter/foundation.dart';

import 'models.dart';
import 'service.dart';

class DestinationsProvider extends ChangeNotifier {
  DestinationsProvider(this.service);
  final DestinationService service;
  DestinationCapabilities? capabilities;
  List<SavedDestination> methods = [];
  bool loading = false, failed = false, _disposed = false;
  int _revision = 0;
  Future<void> refresh() async {
    final revision = ++_revision;
    loading = true;
    failed = false;
    notifyListeners();
    try {
      final caps = await service.capabilities();
      final rows = await service.list();
      if (_disposed || revision != _revision) return;
      capabilities = caps;
      methods = rows;
    } catch (_) {
      if (_disposed || revision != _revision) return;
      failed = true;
    }
    if (_disposed) return;
    loading = false;
    notifyListeners();
  }

  List<SavedDestination> search(String query, DestinationType type) {
    final q = query.trim().toLowerCase();
    final rows = methods
        .where(
          (d) =>
              d.details.type == type &&
              '${d.label} ${d.details.display}'.toLowerCase().contains(q),
        )
        .toList();
    rows.sort(
      (a, b) => (b.lastUsed ?? DateTime(1970)).compareTo(
        a.lastUsed ?? DateTime(1970),
      ),
    );
    return rows;
  }

  void reset() {
    _revision++;
    methods = [];
    capabilities = null;
    loading = failed = false;
    service.clearTransient();
    notifyListeners();
  }

  @override
  void dispose() {
    _disposed = true;
    _revision++;
    super.dispose();
  }
}