Frontend first draft

frontend/pshared/lib/provider/organizations.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+
+import 'package:collection/collection.dart';
+
+import 'package:pshared/config/constants.dart';
+import 'package:pshared/models/organization/organization.dart';
+import 'package:pshared/provider/resource.dart';
+import 'package:pshared/provider/exception.dart';
+import 'package:pshared/service/organization.dart';
+import 'package:pshared/service/secure_storage.dart';
+
+
+class OrganizationsProvider extends ChangeNotifier {
+  Resource<List<Organization>> _resource = Resource(data: []);
+  Resource<List<Organization>> get resource => _resource;
+
+  List<Organization> get organizations => _resource.data ?? [];
+  String? _currentOrg;
+
+  Organization get current => isOrganizationSet ? _current! : throw StateError('Organization is not set');
+
+  Organization? _org(String? orgRef) => organizations.firstWhereOrNull((org) => org.id == orgRef);
+  Organization? get _current => _org(_currentOrg);
+
+  bool get isOrganizationSet => _current != null;
+  bool get isLoading => _resource.isLoading;
+  Object? get error => _resource.error;
+
+  void _setResource(Resource<List<Organization>> newResource) {
+    _resource = newResource;
+    notifyListeners();
+  }
+
+  Future<List<Organization>> load() async {
+    _setResource(_resource.copyWith(isLoading: true, error: null));
+    try {
+      final orgs = await OrganizationService.list();
+      // fetch stored org
+      String? org = await SecureStorageService.get(Constants.currentOrgKey);
+      // check stored org availability
+      org = orgs.firstWhereOrNull((o) => o.id == org)?.id;
+      // fallback if org is not set or not available
+      org ??= orgs.first.id;
+      await setCurrentOrganization(org);
+      _setResource(Resource(data: orgs, isLoading: false));
+      return orgs;
+    } catch (e) {
+      _setResource(_resource.copyWith(isLoading: false, error: toException(e)));
+      rethrow;
+    }
+  }
+
+  Future<Organization> loadByInvitation(String invitationRef) async {
+    _setResource(_resource.copyWith(isLoading: true, error: null));
+    try {
+      final org = await OrganizationService.loadByInvitation(invitationRef);
+      await setCurrentOrganization(org.id);
+      _setResource(Resource(data: [org], isLoading: false));
+      return org;
+    } catch (e) {
+      _setResource(_resource.copyWith(isLoading: false, error: toException(e)));
+      rethrow;
+    }
+  }
+
+  bool _setCurrentOrganization(String? orgRef) {
+    final organizationRef = _org(orgRef)?.id;
+    if (organizationRef == null) return false;
+
+    _currentOrg = organizationRef;
+    return true;
+  }
+
+  Future<bool> setCurrentOrganization(String? orgRef) async {
+    if (!_setCurrentOrganization(orgRef)) return false;
+    await SecureStorageService.set(Constants.currentOrgKey, orgRef);
+    notifyListeners();
+    return true;
+  }
+}