instruction_app/lib/providers/worker_provider.dart

import 'package:flutter/foundation.dart';
import '../data/interface/IRepository.dart';
import '../models/worker.dart';

class WorkerProvider extends ChangeNotifier {
  final Repository<Worker> _repository;
  List<Worker> _workers = [];
  bool _isLoading = false;
  String? _error;

  WorkerProvider(this._repository);

  List<Worker> get workers => _workers;
  bool get isLoading => _isLoading;
  String? get error => _error;

  Future<void> loadWorkers() async {
    _isLoading = true;
    _error = null;
    notifyListeners();

    try {
      _workers = await _repository.load();
    } catch (e) {
      _error = e.toString();
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  Future<void> addWorker(Worker worker) async {
    _isLoading = true;
    _error = null;
    notifyListeners();

    try {
      final newWorker = await _repository.add(worker);
      _workers.add(newWorker);
    } catch (e) {
      _error = e.toString();
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  Future<void> updateWorker(Worker worker) async {
    _isLoading = true;
    _error = null;
    notifyListeners();

    try {
      await _repository.update(worker);
      final index = _workers.indexWhere((w) => w.id == worker.id);
      if (index != -1) {
        _workers[index] = worker;
      }
    } catch (e) {
      _error = e.toString();
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  Future<void> deleteWorker(String? id) async {
    if (id == null) return;
    
    _isLoading = true;
    _error = null;
    notifyListeners();

    try {
      await _repository.delete(id);
      _workers.removeWhere((worker) => worker.id == id);
    } catch (e) {
      _error = e.toString();
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }
}