Add provider and screen for body weight entries

lib/helpers/json.dart

@@ -0,0 +1,7 @@
+num toNum(String e) {
+  return num.parse(e);
+}
+
+String toString(num e) {
+  return e.toString();
+}

lib/main.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:provider/provider.dart';
 import 'package:wger/locale/locales.dart';
+import 'package:wger/providers/body_weight.dart';
 import 'package:wger/providers/exercises.dart';
 import 'package:wger/providers/nutritional_plans.dart';
 import 'package:wger/providers/workout_plans.dart';
@@ -53,6 +54,13 @@ class MyApp extends StatelessWidget {
                 auth,
                 previous == null ? [] : previous.items,
               ),
+            ),
+            ChangeNotifierProxyProvider<Auth, BodyWeight>(
+              create: null, // TODO: Create is required but it can be null??
+              update: (context, value, previous) => BodyWeight(
+                auth,
+                previous == null ? [] : previous.items,
+              ),
             )
           ],
           child: MaterialApp(

lib/models/body_weight/weight_entry.dart

@@ -0,0 +1,27 @@
+import 'package:flutter/foundation.dart';
+import 'package:json_annotation/json_annotation.dart';
+import 'package:wger/helpers/json.dart';
+
+part 'weight_entry.g.dart';
+
+@JsonSerializable()
+class WeightEntry {
+  @JsonKey(required: true)
+  final int id;
+
+  @JsonKey(required: true, fromJson: toNum, toJson: toString)
+  final num weight;
+
+  @JsonKey(required: true)
+  final DateTime date;
+
+  WeightEntry({
+    @required this.id,
+    @required this.weight,
+    @required this.date,
+  });
+
+  // Boilerplate
+  factory WeightEntry.fromJson(Map<String, dynamic> json) => _$WeightEntryFromJson(json);
+  Map<String, dynamic> toJson() => _$WeightEntryToJson(this);
+}

lib/models/body_weight/weight_entry.g.dart

@@ -0,0 +1,22 @@
+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'weight_entry.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+WeightEntry _$WeightEntryFromJson(Map<String, dynamic> json) {
+  $checkKeys(json, requiredKeys: const ['id', 'weight', 'date']);
+  return WeightEntry(
+    id: json['id'] as int,
+    weight: toNum(json['weight'] as String),
+    date: json['date'] == null ? null : DateTime.parse(json['date'] as String),
+  );
+}
+
+Map<String, dynamic> _$WeightEntryToJson(WeightEntry instance) => <String, dynamic>{
+      'id': instance.id,
+      'weight': instance.weight,
+      'date': instance.date?.toIso8601String(),
+    };

lib/providers/body_weight.dart

@@ -0,0 +1,86 @@
+import 'dart:convert';
+import 'dart:developer';
+
+import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
+import 'package:wger/models/body_weight/weight_entry.dart';
+import 'package:wger/providers/auth.dart';
+
+class BodyWeight with ChangeNotifier {
+  static const nutritionPlansUrl = '/api/v2/weightentry/';
+
+  String _url;
+  Auth _auth;
+  List<WeightEntry> _entries = [];
+
+  BodyWeight(Auth auth, List<WeightEntry> entries) {
+    this._auth = auth;
+    this._entries = entries;
+    this._url = auth.serverUrl + nutritionPlansUrl;
+  }
+
+  List<WeightEntry> get items {
+    return [..._entries];
+  }
+
+  WeightEntry findById(int id) {
+    return _entries.firstWhere((plan) => plan.id == id);
+  }
+
+  Future<void> fetchAndSetEntries() async {
+    final response = await http.get(
+      _url,
+      headers: <String, String>{'Authorization': 'Token ${_auth.token}'},
+    );
+    final extractedData = json.decode(response.body) as Map<String, dynamic>;
+
+    final List<WeightEntry> loadedEntries = [];
+    if (loadedEntries == null) {
+      return;
+    }
+
+    for (final entry in extractedData['results']) {
+      loadedEntries.add(WeightEntry.fromJson(entry));
+    }
+
+    _entries = loadedEntries;
+    notifyListeners();
+  }
+
+  Future<void> addEntry(WeightEntry entry) async {
+    try {
+      final response = await http.post(
+        _url,
+        headers: {
+          'Authorization': 'Token ${_auth.token}',
+          'Content-Type': 'application/json; charset=UTF-8',
+        },
+        body: json.encode(entry.toJson()),
+      );
+      _entries.insert(0, WeightEntry.fromJson(json.decode(response.body)));
+      notifyListeners();
+    } catch (error) {
+      log(error);
+      throw error;
+    }
+  }
+
+  Future<void> deleteEntry(int id) async {
+    final url = '$_url$id/';
+    final existingPlanIndex = _entries.indexWhere((element) => element.id == id);
+    var existingPlan = _entries[existingPlanIndex];
+    _entries.removeAt(existingPlanIndex);
+    notifyListeners();
+
+    final response = await http.delete(
+      url,
+      headers: {'Authorization': 'Token ${_auth.token}'},
+    );
+    if (response.statusCode >= 400) {
+      _entries.insert(existingPlanIndex, existingPlan);
+      notifyListeners();
+      //throw HttpException();
+    }
+    existingPlan = null;
+  }
+}

lib/screens/weight_screen.dart

@@ -1,9 +1,17 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:wger/models/body_weight/weight_entry.dart';
+import 'package:wger/providers/body_weight.dart';
 import 'package:wger/widgets/app_drawer.dart';
+import 'package:wger/widgets/weight/entries_list.dart';
 
 class WeightScreen extends StatelessWidget {
   static const routeName = '/weight';
 
+  Future<void> _refreshWeightEntries(BuildContext context) async {
+    await Provider.of<BodyWeight>(context, listen: false).fetchAndSetEntries();
+  }
+
   Widget getAppBar() {
     return AppBar(
       title: Text('Weight'),
@@ -22,9 +30,27 @@ class WeightScreen extends StatelessWidget {
       appBar: getAppBar(),
       drawer: AppDrawer(),
       floatingActionButton: FloatingActionButton(
-        onPressed: () {},
+        onPressed: () {
+          Provider.of<BodyWeight>(context, listen: false).addEntry(
+            WeightEntry(
+              date: DateTime.now(),
+              weight: 80,
+            ),
+          );
+        },
         child: const Icon(Icons.add),
       ),
+      body: FutureBuilder(
+        future: _refreshWeightEntries(context),
+        builder: (context, snapshot) => snapshot.connectionState == ConnectionState.waiting
+            ? Center(child: CircularProgressIndicator())
+            : RefreshIndicator(
+                onRefresh: () => _refreshWeightEntries(context),
+                child: Consumer<BodyWeight>(
+                  builder: (context, productsData, child) => WeightEntriesList(),
+                ),
+              ),
+      ),
     );
   }
 }

lib/widgets/weight/entries_list.dart

@@ -0,0 +1,62 @@
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'package:provider/provider.dart';
+import 'package:wger/providers/body_weight.dart';
+
+class WeightEntriesList extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    final weightEntriesData = Provider.of<BodyWeight>(context);
+    return ListView.builder(
+      padding: const EdgeInsets.all(10.0),
+      itemCount: weightEntriesData.items.length,
+      itemBuilder: (context, index) {
+        final currentEntry = weightEntriesData.items[index];
+        return Dismissible(
+          key: Key(currentEntry.id.toString()),
+          onDismissed: (direction) {
+            // Delete workout from DB
+            Provider.of<BodyWeight>(context, listen: false).deleteEntry(currentEntry.id);
+
+            // and inform the user
+            Scaffold.of(context).showSnackBar(
+              SnackBar(
+                content: Text(
+                  "Weight entry for the ${currentEntry.date}",
+                  textAlign: TextAlign.center,
+                ),
+              ),
+            );
+          },
+          background: Container(
+            color: Theme.of(context).errorColor,
+            alignment: Alignment.centerRight,
+            padding: EdgeInsets.only(right: 20),
+            margin: EdgeInsets.symmetric(
+              horizontal: 4,
+              vertical: 4,
+            ),
+            child: Icon(
+              Icons.delete,
+              color: Colors.white,
+            ),
+          ),
+          direction: DismissDirection.endToStart,
+          child: Card(
+            child: ListTile(
+              //onTap: () => Navigator.of(context).pushNamed(
+              //  WorkoutPlanScreen.routeName,
+              //  arguments: currentPlan,
+              //),
+              onTap: () {},
+              title: Text(
+                DateFormat('dd.MM.yyyy').format(currentEntry.date).toString(),
+              ),
+              subtitle: Text('${currentEntry.weight} kg'),
+            ),
+          ),
+        );
+      },
+    );
+  }
+}

lib/widgets/workouts/workout_plans_list.dart

@@ -49,7 +49,6 @@ class WorkoutPlansList extends StatelessWidget {
                 WorkoutPlanScreen.routeName,
                 arguments: currentWorkout,
               ),
-              leading: Icon(Icons.edit),
               title: Text(
                 DateFormat('dd.MM.yyyy').format(currentWorkout.creationDate).toString(),
               ),