- Introduction on base view model and stateless widget classes

- Implementation of firebase
- Implementation of dependency injection

Took 11 hours 26 minutes

lib/base/BaseModel.dart

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+import 'dart:async';
+
+import 'package:days_left/data/ViewState.dart';
+import 'package:stacked/stacked.dart';
+
+class BaseModel extends BaseViewModel {
+  ViewState _viewState = Idle();
+
+  ViewState get viewState => _viewState;
+
+  void onStart() {
+    _viewState = HasStarted();
+    notifyListeners();
+  }
+
+  void onSuccess(dynamic data) {
+    _viewState = HasData(data);
+    notifyListeners();
+  }
+
+  void onError(String error) {
+    _viewState = HasError(error);
+    notifyListeners();
+  }
+
+  void handleFuture(Future<dynamic> func) {
+    onStart();
+    func.then((value) => onSuccess(value)).catchError((error) {
+      print(error);
+      onError(error);
+    });
+  }
+
+  void handleStream(Stream<dynamic> stream) {
+    stream.listen((event) {
+      onSuccess(event);
+    }).onError((handleError) {
+      onError(handleError);
+    });
+  }
+}

lib/base/BaseStatelessWidget.dart

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+import 'package:days_left/Utils/ViewUtils.dart';
+import 'package:days_left/data/ViewState.dart';
+import 'BaseModel.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:stacked/stacked.dart';
+
+abstract class BaseStatelessWidget extends StatelessWidget {
+  BaseModel getBaseModel();
+  Widget displayWidget(context, model, child);
+
+  @override
+  Widget build(BuildContext parent) {
+    return ViewModelBuilder<BaseModel>.reactive(
+        builder: (context, model, child) {
+          var state = model.viewState;
+
+          if (state is HasStarted)
+            return Center(
+              child: CircularProgressIndicator(),
+            );
+          else if (state is HasError)
+            WidgetsBinding.instance.addPostFrameCallback(
+                    (_) => ViewUtils.displayToast(parent, state.error));
+
+          return Center(
+            child: displayWidget(context, model, child),
+          );
+        },
+        viewModelBuilder: () => getBaseModel());
+  }
+}