Finished custom sorting of deliveries

lib/feature/delivery/overview/bloc/tour_bloc.dart

@@ -4,8 +4,10 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_event.dart';
 import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_state.dart';
+import 'package:hl_lieferservice/feature/delivery/overview/model/sorting_information.dart';
 import 'package:hl_lieferservice/feature/delivery/overview/repository/tour_repository.dart';
 import 'package:hl_lieferservice/feature/delivery/overview/service/distance_service.dart';
+import 'package:hl_lieferservice/feature/delivery/overview/service/reorder_service.dart';
 import 'package:hl_lieferservice/model/tour.dart';
 import 'package:hl_lieferservice/widget/operations/bloc/operation_bloc.dart';
 import 'package:hl_lieferservice/widget/operations/bloc/operation_event.dart';
@@ -50,6 +52,8 @@ class TourBloc extends Bloc<TourEvent, TourState> {
     on<FinishDeliveryEvent>(_finishDelivery);
     on<TourUpdated>(_updated);
     on<RequestDeliveryDistanceEvent>(_calculateDistances);
+    on<RequestSortingInformationEvent>(_requestSortingInformation);
+    on<ReorderDeliveryEvent>(_reorderDelivery);
   }
 
   @override
@@ -59,6 +63,36 @@ class TourBloc extends Bloc<TourEvent, TourState> {
     return super.close();
   }
 
+  void _reorderDelivery(
+    ReorderDeliveryEvent event,
+    Emitter<TourState> emit,
+  ) async {
+    final currentState = state;
+    if (currentState is TourLoaded) {
+      int newPosition = event.newPosition == currentState.sortingInformation.sorting.length ? event.newPosition - 1 : event.newPosition;
+      SortingInformation informationOld = currentState.sortingInformation.sorting
+          .firstWhere((info) => info.position == event.oldPosition);
+
+      SortingInformation information = currentState
+          .sortingInformation
+          .sorting
+          .firstWhere((info) => info.position == newPosition);
+
+      information.position = event.oldPosition;
+      informationOld.position = newPosition;
+
+      await ReorderService().saveSortingInformation(
+        currentState.sortingInformation,
+      );
+
+      emit(
+        currentState.copyWith(
+          sortingInformation: currentState.sortingInformation.copyWith(),
+        ),
+      );
+    }
+  }
+
   void _calculateDistances(
     RequestDeliveryDistanceEvent event,
     Emitter<TourState> emit,
@@ -79,15 +113,104 @@ class TourBloc extends Bloc<TourEvent, TourState> {
       debugPrint("Fehler beim Berechnen der Distanzen: $e");
       opBloc.add(FailOperation(message: "Fehler beim Berechnen der Distanzen"));
       return;
+    } finally {
+      // Independent of error state fetch the sorting information
+      add(
+        RequestSortingInformationEvent(
+          tour: event.tour,
+          payments: event.payments,
+          distances: distances,
+        ),
+      );
+    }
+  }
+
+  void _requestSortingInformation(
+    RequestSortingInformationEvent event,
+    Emitter<TourState> emit,
+  ) async {
+    try {
+      ReorderService service = ReorderService();
+      SortingInformationContainer container = SortingInformationContainer(
+        sorting: [],
+      );
+
+      // Create empty default value if it does not exist yet
+      if (!service.orderInformationExist()) {
+        await service.initializeTour(event.tour);
+      }
+
+      // Populate the container with information. If the file did not exist then it
+      // now contains the standard values.
+      container = await service.loadSortingInformation();
+
+      bool inconsistent = false;
+      for (final delivery in event.tour.deliveries) {
+        int info = container.sorting.indexWhere(
+          (info) => info.deliveryId == delivery.id,
+        );
+        int max = container.sorting.fold(0, (acc, element) {
+          if (element.position > acc) {
+            return element.position;
+          }
+          return acc;
+        });
+
+        // not found, so add it to the list
+        if (info == -1) {
+          inconsistent = true;
+          container.sorting.add(
+            SortingInformation(
+              deliveryId: delivery.id,
+              position: container.sorting.isEmpty ? 0 : max + 1,
+            ),
+          );
+        }
+      }
+
+      // if new deliveries were added then save the information with the newly
+      // populated container
+      if (inconsistent) {
+        await service.saveSortingInformation(container);
       }
 
       emit(
         TourLoaded(
           tour: event.tour,
           paymentOptions: event.payments,
-        distances: distances,
+          sortingInformation: container,
+          distances: event.distances,
         ),
       );
+    } catch (e, st) {
+      debugPrint("Fehler beim Lesen der Datei: $e");
+      debugPrint("$st");
+
+      opBloc.add(
+        FailOperation(
+          message:
+              "Fehler beim Laden der Sortierung. Es wird ohne Sortierung fortgefahren",
+        ),
+      );
+
+      SortingInformationContainer container = SortingInformationContainer(
+        sorting: [],
+      );
+      for (final (index, delivery) in event.tour.deliveries.indexed) {
+        container.sorting.add(
+          SortingInformation(deliveryId: delivery.id, position: index),
+        );
+      }
+
+      emit(
+        TourLoaded(
+          tour: event.tour,
+          paymentOptions: event.payments,
+          sortingInformation: container,
+          distances: event.distances,
+        ),
+      );
+    }
   }
 
   void _updated(TourUpdated event, Emitter<TourState> emit) {
@@ -97,16 +220,17 @@ class TourBloc extends Bloc<TourEvent, TourState> {
         event.payments.map((payment) => payment.copyWith()).toList();
 
     if (currentState is TourLoaded) {
-      debugPrint("TEST UPDATE");
       emit(
         TourLoaded(
           tour: tour,
           paymentOptions: payments,
           distances: Map<String, double>.from(currentState.distances ?? {}),
+          sortingInformation: currentState.sortingInformation,
         ),
       );
     }
 
+    // Download distances if tour has previously fetched by API
     if (currentState is TourLoading) {
       add(
         RequestDeliveryDistanceEvent(tour: tour.copyWith(), payments: payments),

lib/feature/delivery/overview/bloc/tour_event.dart

@@ -19,6 +19,21 @@ class RequestDeliveryDistanceEvent extends TourEvent {
   RequestDeliveryDistanceEvent({required this.tour, required this.payments});
 }
 
+class RequestSortingInformationEvent extends TourEvent {
+  Tour tour;
+  List<Payment> payments;
+  Map<String, double>? distances;
+
+  RequestSortingInformationEvent({required this.tour, required this.payments, this.distances});
+}
+
+class ReorderDeliveryEvent extends TourEvent {
+  int newPosition;
+  int oldPosition;
+
+  ReorderDeliveryEvent({required this.newPosition, required this.oldPosition});
+}
+
 class TourUpdated extends TourEvent {
   Tour tour;
   List<Payment> payments;

lib/feature/delivery/overview/bloc/tour_state.dart

@@ -1,3 +1,5 @@
+import 'package:hl_lieferservice/feature/delivery/overview/model/sorting_information.dart';
+
 import '../../../../model/tour.dart';
 
 abstract class TourState {}
@@ -13,26 +15,42 @@ class TourRequestingDistances extends TourState {
   TourRequestingDistances({required this.tour, required this.payments});
 }
 
+class TourRequestingSortingInformation extends TourState {
+  Tour tour;
+  Map<String, double>? distances;
+  List<Payment> paymentOptions;
+
+  TourRequestingSortingInformation({
+    required this.tour,
+    this.distances,
+    required this.paymentOptions,
+  });
+}
+
 class TourLoaded extends TourState {
   Tour tour;
   Map<String, double>? distances;
   List<Payment> paymentOptions;
+  SortingInformationContainer sortingInformation;
 
   TourLoaded({
     required this.tour,
     this.distances,
     required this.paymentOptions,
+    required this.sortingInformation
   });
 
   TourLoaded copyWith({
     Tour? tour,
     Map<String, double>? distances,
     List<Payment>? paymentOptions,
+    SortingInformationContainer? sortingInformation
   }) {
     return TourLoaded(
       tour: tour ?? this.tour,
       distances: distances ?? this.distances,
       paymentOptions: paymentOptions ?? this.paymentOptions,
+      sortingInformation: sortingInformation ?? this.sortingInformation
     );
   }
 }

lib/feature/delivery/overview/model/sorting_information.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/cupertino.dart';
+
+class SortingInformation {
+  String deliveryId;
+  int position;
+
+  SortingInformation({required this.deliveryId, required this.position});
+
+  static Map<String, dynamic> toJson(SortingInformation info) {
+    return {"delivery_id": info.deliveryId, "position": info.position};
+  }
+
+  static SortingInformation fromJson(Map<String, dynamic> json) {
+    return SortingInformation(
+      deliveryId: json["delivery_id"].toString(),
+      position: json["position"],
+    );
+  }
+}
+
+class SortingInformationContainer {
+  List<SortingInformation> sorting;
+
+  SortingInformationContainer({required this.sorting});
+
+  void sort() {
+    sorting.sort((a, b) => a.position.compareTo(b.position));
+  }
+
+  static SortingInformationContainer fromJson(Map<String, dynamic> json) {
+    SortingInformationContainer container = SortingInformationContainer(
+      sorting: [],
+    );
+
+    for (final info in json["sorting"]) {
+      container.sorting.add(SortingInformation.fromJson(info));
+    }
+
+    return container;
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      "sorting":
+          sorting.map((info) => SortingInformation.toJson(info)).toList(),
+    };
+  }
+
+  SortingInformationContainer copyWith({List<SortingInformation>? sorting}) {
+    return SortingInformationContainer(
+      sorting: sorting ?? this.sorting,
+    );
+  }
+}

lib/feature/delivery/overview/presentation/delivery_list.dart

@@ -1,4 +1,8 @@
 import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_bloc.dart';
+import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_state.dart';
+import 'package:hl_lieferservice/feature/delivery/overview/model/sorting_information.dart';
 import 'package:hl_lieferservice/model/delivery.dart';
 
 import 'delivery_item.dart';
@@ -6,11 +10,13 @@ import 'delivery_item.dart';
 class DeliveryList extends StatefulWidget {
   final List<Delivery> deliveries;
   final Map<String, double> distances;
+  final List<SortingInformation> sortingInformation;
 
   const DeliveryList({
     super.key,
     required this.deliveries,
     required this.distances,
+    required this.sortingInformation,
   });
 
   @override
@@ -26,16 +32,32 @@ class _DeliveryListState extends State<DeliveryList> {
       );
     }
 
+    return BlocBuilder<TourBloc, TourState>(
+      builder: (context, state) {
+        final currentState = state;
+        if (currentState is TourLoaded) {
+          List<SortingInformation> sorted = [...currentState.sortingInformation.sorting];
+          sorted.sort((a, b) => a.position.compareTo(b.position));
+
           return ListView.separated(
             separatorBuilder: (context, index) => const Divider(height: 0),
             itemBuilder: (context, index) {
-        Delivery delivery = widget.deliveries[index];
+              SortingInformation info = sorted[index];
+              Delivery delivery = currentState.tour.deliveries.firstWhere(
+                (delivery) => info.deliveryId == delivery.id,
+              );
+
               return DeliveryListItem(
                 delivery: delivery,
-          distance: widget.distances[delivery.id] ?? 0.0,
+                distance: currentState.distances?[delivery.id] ?? 0.0,
               );
             },
-      itemCount: widget.deliveries.length,
+            itemCount: sorted.length,
+          );
+        }
+
+        return Center(child: CircularProgressIndicator());
+      },
     );
   }
 }

lib/feature/delivery/overview/presentation/delivery_overview.dart

@@ -10,6 +10,7 @@ import 'package:hl_lieferservice/model/tour.dart';
 import '../../../../model/delivery.dart';
 import '../../../authentication/bloc/auth_bloc.dart';
 import '../../../authentication/bloc/auth_state.dart';
+import '../bloc/tour_state.dart';
 
 class DeliveryOverview extends StatefulWidget {
   const DeliveryOverview({
@@ -186,6 +187,10 @@ class _DeliveryOverviewState extends State<DeliveryOverview> {
           Expanded(
             child: DeliveryList(
               distances: widget.distances,
+              sortingInformation:
+                  (context.read<TourBloc>().state as TourLoaded)
+                      .sortingInformation
+                      .sorting,
               deliveries:
                   _deliveries
                       .where(

lib/feature/delivery/overview/presentation/delivery_overview_custom_sort.dart

@@ -1,7 +1,11 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_bloc.dart';
+import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_event.dart';
 import 'package:hl_lieferservice/feature/delivery/overview/bloc/tour_state.dart';
+import 'package:hl_lieferservice/model/delivery.dart';
+
+import '../model/sorting_information.dart';
 
 class CustomSortDialog extends StatefulWidget {
   const CustomSortDialog({super.key});
@@ -11,6 +15,21 @@ class CustomSortDialog extends StatefulWidget {
 }
 
 class _CustomSortDialogState extends State<CustomSortDialog> {
+  late List<SortingInformation> _localSortedList;
+
+  @override
+  void initState() {
+    super.initState();
+    final state = context.read<TourBloc>().state;
+    if (state is TourLoaded) {
+      _localSortedList = [...state.sortingInformation.sorting];
+      _localSortedList.sort((a, b) => a.position.compareTo(b.position));
+    } else {
+      _localSortedList = [];
+    }
+  }
+
+
   Widget _information() {
     return Padding(
       padding: EdgeInsets.only(top: 15),
@@ -47,33 +66,51 @@ class _CustomSortDialogState extends State<CustomSortDialog> {
         if (currentState is TourLoaded) {
           return Expanded(
             child: ReorderableListView(
-              onReorder: (oldIndex, newIndex) {},
+              onReorder: (oldIndex, newIndex) {
-              children: currentState.tour.deliveries.indexed.fold([], (
+                setState(() {
-                acc,
+                  if (oldIndex < newIndex) {
-                current,
+                    newIndex -= 1;
-              ) {
+                  }
-                final delivery = current.$2;
+                  final SortingInformation item = _localSortedList.removeAt(oldIndex);
-                final index = current.$1;
+                  _localSortedList.insert(newIndex, item);
+                });
 
-                acc.add(
+                context.read<TourBloc>().add(
-                  ListTile(
+                  ReorderDeliveryEvent(
+                    newPosition: newIndex,
+                    oldPosition: oldIndex,
+                  ),
+                );
+              },
+              children:
+              _localSortedList.map((info) {
+                    Delivery delivery = currentState.tour.deliveries.firstWhere(
+                      (delivery) => delivery.id == info.deliveryId,
+                    );
+                    SortingInformation information = currentState
+                        .sortingInformation
+                        .sorting
+                        .firstWhere((info) => info.deliveryId == delivery.id);
+
+                    return ListTile(
                       leading: CircleAvatar(
                         backgroundColor: Theme.of(context).primaryColor,
                         child: Text(
-                        "${index + 1}",
+                          "${information.position + 1}",
                           style: TextStyle(
                             color: Theme.of(context).colorScheme.onSecondary,
                           ),
                         ),
                       ),
                       title: Text(delivery.customer.name),
-                    subtitle: Text(delivery.customer.address.toString(), style: TextStyle(fontSize: 11),),
+                      subtitle: Text(
+                        delivery.customer.address.toString(),
+                        style: TextStyle(fontSize: 11),
+                      ),
                       trailing: Icon(Icons.drag_handle),
                       key: Key("reorder-item-${delivery.id}"),
-                  ),
                     );
-                return acc;
+                  }).toList(),
-              }),
             ),
           );
         }

lib/feature/delivery/overview/service/reorder_service.dart

@@ -0,0 +1,53 @@
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:hl_lieferservice/model/tour.dart';
+import 'package:path_provider/path_provider.dart';
+
+import '../model/sorting_information.dart';
+
+class ReorderService {
+  get _path async {
+    final dir = await getApplicationDocumentsDirectory();
+    final date = DateTime.now();
+    final filename =
+        "custom_sort_${date.year}_${date.month}_${date.day}.json";
+    final path = "${dir.path}/$filename";
+
+    return path;
+  }
+
+  Future<File> get _file async {
+    final path = await _path;
+    final file = File(path);
+
+    return file;
+  }
+
+  Future<void> saveSortingInformation(SortingInformationContainer container) async {
+    (await _file).writeAsString(jsonEncode(container.toJson()));
+  }
+
+  Future<void> initializeTour(Tour tour) async {
+    (await _file).create();
+    SortingInformationContainer container = SortingInformationContainer(sorting: []);
+    
+    for (final (index, delivery) in tour.deliveries.indexed) {
+      container.sorting.add(
+        SortingInformation(deliveryId: delivery.id, position: index),
+      );
+    }
+
+    (await _file).writeAsString(jsonEncode(container.toJson()));
+  }
+
+  bool orderInformationExist() {
+    return false;
+  }
+
+  Future<SortingInformationContainer> loadSortingInformation() async {
+    return SortingInformationContainer.fromJson(
+        jsonDecode(await (await _file).readAsString()),
+    );
+  }
+}