Frontend first draft

frontend/pshared/lib/provider/accounts/employees.dart

@@ -0,0 +1,58 @@
+import 'package:flutter/material.dart';
+
+import 'package:collection/collection.dart';
+
+import 'package:pshared/models/organization/employee.dart';
+import 'package:pshared/provider/organizations.dart';
+import 'package:pshared/provider/resource.dart';
+import 'package:pshared/service/accounts/employees.dart';
+
+
+class EmployeesProvider extends ChangeNotifier {
+
+  Resource<List<Employee>> _employees = Resource<List<Employee>>(data: []);
+  List<Employee> get employees => _employees.data ?? [];
+  bool get isLoading => _employees.isLoading;
+  Object? get error => _employees.error;
+  Employee? getEmployee(String? employeeRef) => employees.firstWhereOrNull((employee) => employee.id == employeeRef);
+
+
+  bool Function(Employee)? _filterPredicate;
+
+  List<Employee> get filteredItems => _filterPredicate != null 
+    ? employees.where(_filterPredicate!).toList() 
+    : employees;
+
+  void setFilterPredicate(bool Function(Employee)? predicate) {
+    _filterPredicate = predicate;
+    notifyListeners();
+  }
+
+  void clearFilter() => setFilterPredicate(null);
+
+  void updateProviders(OrganizationsProvider organizations) {
+    load(organizations.current.id);
+  }
+
+  Future<List<Employee>> load(String organizationRef) async {
+    _employees = _employees.copyWith(isLoading: true, error: null);
+    notifyListeners();
+
+    try {
+      final fetchedEmployees = await EmployeesService.list(organizationRef);
+      _employees = _employees.copyWith(
+        data: fetchedEmployees,
+        isLoading: false,
+        error: null,
+      );
+    } catch (e) {
+      _employees = _employees.copyWith(
+        error: e is Exception ? e : Exception('Unknown error: ${e.toString()}'),
+        isLoading: false,
+      );
+    }
+
+    notifyListeners();
+    return employees;
+  }
+}