copying final version lib

.vscode/launch.json

@@ -0,0 +1,19 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "shop_http",
+            "request": "launch",
+            "type": "dart"
+        },
+        {
+            "name": "shop_http (profile mode)",
+            "request": "launch",
+            "type": "dart",
+            "flutterMode": "profile"
+        }
+    ]
+}

lib/main.dart

@@ -1,113 +1,48 @@
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
-void main() {
-  runApp(MyApp());
-}
-
-class MyApp extends StatelessWidget {
-  // This widget is the root of your application.
-  @override
-  Widget build(BuildContext context) {
-    return MaterialApp(
-      title: 'Flutter Demo',
-      theme: ThemeData(
-        // This is the theme of your application.
-        //
-        // Try running your application with "flutter run". You'll see the
-        // application has a blue toolbar. Then, without quitting the app, try
-        // changing the primarySwatch below to Colors.green and then invoke
-        // "hot reload" (press "r" in the console where you ran "flutter run",
-        // or simply save your changes to "hot reload" in a Flutter IDE).
-        // Notice that the counter didn't reset back to zero; the application
-        // is not restarted.
-        primarySwatch: Colors.blue,
-      ),
-      home: MyHomePage(title: 'Flutter Demo Home Page'),
-    );
-  }
-}
-
-class MyHomePage extends StatefulWidget {
-  MyHomePage({Key? key, required this.title}) : super(key: key);
-
-  // This widget is the home page of your application. It is stateful, meaning
-  // that it has a State object (defined below) that contains fields that affect
-  // how it looks.
+import './screens/cart_screen.dart';
+import './screens/products_overview_screen.dart';
+import './screens/product_detail_screen.dart';
+import './providers/products.dart';
+import './providers/cart.dart';
+import './providers/orders.dart';
+import './screens/orders_screen.dart';
+import './screens/user_products_screen.dart';
+import './screens/edit_product_screen.dart';
 
-  // This class is the configuration for the state. It holds the values (in this
-  // case the title) provided by the parent (in this case the App widget) and
-  // used by the build method of the State. Fields in a Widget subclass are
-  // always marked "final".
-
-  final String title;
-
-  @override
-  _MyHomePageState createState() => _MyHomePageState();
-}
-
-class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
-
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
+void main() => runApp(MyApp());
 
+class MyApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
-    // This method is rerun every time setState is called, for instance as done
-    // by the _incrementCounter method above.
-    //
-    // The Flutter framework has been optimized to make rerunning build methods
-    // fast, so that you can just rebuild anything that needs updating rather
-    // than having to individually change instances of widgets.
-    return Scaffold(
-      appBar: AppBar(
-        // Here we take the value from the MyHomePage object that was created by
-        // the App.build method, and use it to set our appbar title.
-        title: Text(widget.title),
-      ),
-      body: Center(
-        // Center is a layout widget. It takes a single child and positions it
-        // in the middle of the parent.
-        child: Column(
-          // Column is also a layout widget. It takes a list of children and
-          // arranges them vertically. By default, it sizes itself to fit its
-          // children horizontally, and tries to be as tall as its parent.
-          //
-          // Invoke "debug painting" (press "p" in the console, choose the
-          // "Toggle Debug Paint" action from the Flutter Inspector in Android
-          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
-          // to see the wireframe for each widget.
-          //
-          // Column has various properties to control how it sizes itself and
-          // how it positions its children. Here we use mainAxisAlignment to
-          // center the children vertically; the main axis here is the vertical
-          // axis because Columns are vertical (the cross axis would be
-          // horizontal).
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headline4,
-            ),
-          ],
+    return MultiProvider(
+      providers: [
+        ChangeNotifierProvider.value(
+          value: Products(),
+        ),
+        ChangeNotifierProvider.value(
+          value: Cart(),
+        ),
+        ChangeNotifierProvider.value(
+          value: Orders(),
         ),
-      ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
+      ],
+      child: MaterialApp(
+          title: 'MyShop',
+          theme: ThemeData(
+            primarySwatch: Colors.purple,
+            accentColor: Colors.deepOrange,
+            fontFamily: 'Lato',
+          ),
+          home: ProductsOverviewScreen(),
+          routes: {
+            ProductDetailScreen.routeName: (ctx) => ProductDetailScreen(),
+            CartScreen.routeName: (ctx) => CartScreen(),
+            OrdersScreen.routeName: (ctx) => OrdersScreen(),
+            UserProductsScreen.routeName: (ctx) => UserProductsScreen(),
+            EditProductScreen.routeName: (ctx) => EditProductScreen(),
+          }),
     );
   }
 }

lib/models/http_exception.dart

@@ -0,0 +1,11 @@
+class HttpException implements Exception {
+  final String message;
+
+  HttpException(this.message);
+
+  @override
+  String toString() {
+    return message;
+    // return super.toString(); // Instance of HttpException
+  }
+}

lib/providers/cart.dart

@@ -0,0 +1,94 @@
+import 'package:flutter/foundation.dart';
+
+class CartItem {
+  final String id;
+  final String title;
+  final int quantity;
+  final double price;
+
+  CartItem({
+    @required this.id,
+    @required this.title,
+    @required this.quantity,
+    @required this.price,
+  });
+}
+
+class Cart with ChangeNotifier {
+  Map<String, CartItem> _items = {};
+
+  Map<String, CartItem> get items {
+    return {..._items};
+  }
+
+  int get itemCount {
+    return _items.length;
+  }
+
+  double get totalAmount {
+    var total = 0.0;
+    _items.forEach((key, cartItem) {
+      total += cartItem.price * cartItem.quantity;
+    });
+    return total;
+  }
+
+  void addItem(
+    String productId,
+    double price,
+    String title,
+  ) {
+    if (_items.containsKey(productId)) {
+      // change quantity...
+      _items.update(
+        productId,
+        (existingCartItem) => CartItem(
+              id: existingCartItem.id,
+              title: existingCartItem.title,
+              price: existingCartItem.price,
+              quantity: existingCartItem.quantity + 1,
+            ),
+      );
+    } else {
+      _items.putIfAbsent(
+        productId,
+        () => CartItem(
+              id: DateTime.now().toString(),
+              title: title,
+              price: price,
+              quantity: 1,
+            ),
+      );
+    }
+    notifyListeners();
+  }
+
+  void removeItem(String productId) {
+    _items.remove(productId);
+    notifyListeners();
+  }
+
+  void removeSingleItem(String productId) {
+    if (!_items.containsKey(productId)) {
+      return;
+    }
+    if (_items[productId].quantity > 1) {
+      _items.update(
+          productId,
+          (existingCartItem) => CartItem(
+                id: existingCartItem.id,
+                title: existingCartItem.title,
+                price: existingCartItem.price,
+                quantity: existingCartItem.quantity - 1,
+              ));
+    } else {
+      _items.remove(productId);
+    }
+    notifyListeners();
+  }
+
+  void clear() {
+    _items = {};
+    notifyListeners();
+  }
+}

lib/providers/orders.dart

@@ -0,0 +1,89 @@
+import 'dart:convert';
+
+import 'package:flutter/foundation.dart';
+import 'package:http/http.dart' as http;
+
+import './cart.dart';
+
+class OrderItem {
+  final String id;
+  final double amount;
+  final List<CartItem> products;
+  final DateTime dateTime;
+
+  OrderItem({
+    @required this.id,
+    @required this.amount,
+    @required this.products,
+    @required this.dateTime,
+  });
+}
+
+class Orders with ChangeNotifier {
+  List<OrderItem> _orders = [];
+
+  List<OrderItem> get orders {
+    return [..._orders];
+  }
+
+  Future<void> fetchAndSetOrders() async {
+    final url = Uri.https('flutter-update.firebaseio.com', '/orders.json');
+    final response = await http.get(url);
+    final List<OrderItem> loadedOrders = [];
+    final extractedData = json.decode(response.body) as Map<String, dynamic>;
+    if (extractedData == null) {
+      return;
+    }
+    extractedData.forEach((orderId, orderData) {
+      loadedOrders.add(
+        OrderItem(
+          id: orderId,
+          amount: orderData['amount'],
+          dateTime: DateTime.parse(orderData['dateTime']),
+          products: (orderData['products'] as List<dynamic>)
+              .map(
+                (item) => CartItem(
+                      id: item['id'],
+                      price: item['price'],
+                      quantity: item['quantity'],
+                      title: item['title'],
+                    ),
+              )
+              .toList(),
+        ),
+      );
+    });
+    _orders = loadedOrders.reversed.toList();
+    notifyListeners();
+  }
+
+  Future<void> addOrder(List<CartItem> cartProducts, double total) async {
+    final url = Uri.https('flutter-update.firebaseio.com', '/orders.json');
+    final timestamp = DateTime.now();
+    final response = await http.post(
+      url,
+      body: json.encode({
+        'amount': total,
+        'dateTime': timestamp.toIso8601String(),
+        'products': cartProducts
+            .map((cp) => {
+                  'id': cp.id,
+                  'title': cp.title,
+                  'quantity': cp.quantity,
+                  'price': cp.price,
+                })
+            .toList(),
+      }),
+    );
+    _orders.insert(
+      0,
+      OrderItem(
+        id: json.decode(response.body)['name'],
+        amount: total,
+        dateTime: timestamp,
+        products: cartProducts,
+      ),
+    );
+    notifyListeners();
+  }
+}